CDefaultContextMenu.cpp

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/*
 * PROJECT:     shell32
 * LICENSE:     GPL - See COPYING in the top level directory
 * FILE:        dll/win32/shell32/shv_item_new.c
 * PURPOSE:     provides default context menu implementation
 * PROGRAMMERS: Johannes Anderwald (johannes.anderwald@reactos.org)
 */
 
#include "precomp.h"
#include <compat_undoc.h>
 
WINE_DEFAULT_DEBUG_CHANNEL(dmenu);
 
// FIXME: 260 is correct, but should this be part of the SDK or just MAX_PATH?
#define MAX_VERB 260
 
static HRESULT
SHELL_GetRegCLSID(HKEY hKey, LPCWSTR SubKey, LPCWSTR Value, CLSID &clsid)
{
    WCHAR buf[42];
    DWORD cb = sizeof(buf);
    DWORD err = RegGetValueW(hKey, SubKey, Value, RRF_RT_REG_SZ, NULL, buf, &cb);
    return !err ? CLSIDFromString(buf, &clsid) : HRESULT_FROM_WIN32(err);
}
 
static BOOL InsertMenuItemAt(HMENU hMenu, UINT Pos, UINT Flags)
{
    MENUITEMINFOW mii;
    mii.cbSize = FIELD_OFFSET(MENUITEMINFOW, hbmpItem); // USER32 version agnostic
    mii.fMask = MIIM_TYPE;
    mii.fType = Flags;
    return InsertMenuItemW(hMenu, Pos, TRUE, &mii);
}
 
static void DCMA_DestroyEntry(DCMENTRY &dcme)
{
    if (!dcme.pCM)
        return;
    IUnknown_SetSite(dcme.pCM, NULL);
    dcme.pCM->Release();
    dcme.pCM = NULL;
}
 
void DCMA_Destroy(HDCMA hDCMA)
{
    UINT i = 0;
    for (DCMENTRY *p; (p = DCMA_GetEntry(hDCMA, i)) != NULL; ++i)
        DCMA_DestroyEntry(*p);
    DSA_Destroy(hDCMA);
}
 
UINT DCMA_InsertMenuItems(
    _In_ HDCMA hDCMA,
    _In_ HDCIA hDCIA,
    _In_opt_ LPCITEMIDLIST pidlFolder,
    _In_opt_ IDataObject *pDO,
    _In_opt_ HKEY *pKeys,
    _In_opt_ UINT nKeys,
    _In_ QCMINFO *pQCMI,
    _In_opt_ UINT fCmf,
    _In_opt_ IUnknown *pUnkSite)
{
    UINT idCmdBase = pQCMI->idCmdFirst, idCmdFirst = idCmdBase;
    UINT nOffset = 0;
 
    // Insert in reverse order
    for (int iCls = DCIA_GetCount(hDCIA) - 1; iCls >= 0; --iCls)
    {
        REFCLSID clsid = *DCIA_GetEntry(hDCIA, iCls);
        if (fCmf & CMF_DEFAULTONLY)
        {
            WCHAR szKey[MAX_PATH];
            wcscpy(szKey, L"CLSID\\");
            StringFromGUID2(clsid, szKey + _countof(L"CLSID\\") - 1, CHARS_IN_GUID);
            wcscpy(szKey + _countof(L"CLSID\\") - 1 + CHARS_IN_GUID - 1, L"\\shellex\\MayChangeDefaultMenu");
            if (!RegKeyExists(HKEY_CLASSES_ROOT, szKey))
                continue;
        }
 
        for (UINT iKey = 0; iKey < nKeys; ++iKey)
        {
            CComPtr<IShellExtInit> pInit;
            HRESULT hr = SHExtCoCreateInstance(NULL, &clsid, NULL, IID_PPV_ARG(IShellExtInit, &pInit));
            if (FAILED(hr))
                break;
            if (FAILED(hr = pInit->Initialize(pidlFolder, pDO, pKeys[iKey])))
                continue;
 
            IContextMenu *pCM;
            if (FAILED(hr = pInit->QueryInterface(IID_PPV_ARG(IContextMenu, &pCM))))
                break;
            IUnknown_SetSite(pCM, pUnkSite);
 
            hr = pCM->QueryContextMenu(pQCMI->hmenu, pQCMI->indexMenu + nOffset, idCmdFirst, pQCMI->idCmdLast, fCmf);
            const UINT nCount = HRESULT_CODE(hr);
            const UINT idThisFirst = idCmdFirst - idCmdBase;
            DCMENTRY dcme = { pCM, idThisFirst, idThisFirst + nCount - 1 };
            if (hr > 0)
            {
                idCmdFirst += nCount;
                if (DSA_AppendItem(hDCMA, &dcme) >= 0)
                {
                    if (nOffset == 0 && GetMenuDefaultItem(pQCMI->hmenu, TRUE, 0) == 0)
                        nOffset++; // Insert new items below the default
                    break;
                }
            }
            DCMA_DestroyEntry(dcme);
        }
    }
    return idCmdFirst;
}
 
HRESULT DCMA_InvokeCommand(HDCMA hDCMA, CMINVOKECOMMANDINFO *pICI)
{
    HRESULT hr = S_FALSE;
    for (UINT i = 0;; ++i)
    {
        DCMENTRY *p = DCMA_GetEntry(hDCMA, i);
        if (!p)
            return hr;
 
        UINT id = LOWORD(pICI->lpVerb);
        if (!IS_INTRESOURCE(pICI->lpVerb))
        {
            if (SUCCEEDED(hr = p->pCM->InvokeCommand(pICI)))
                return hr;
        }
        else if (id >= p->idCmdFirst && id <= p->idCmdLast)
        {
            CMINVOKECOMMANDINFOEX ici;
            CopyMemory(&ici, pICI, min(sizeof(ici), pICI->cbSize));
            ici.cbSize = min(sizeof(ici), pICI->cbSize);
            ici.lpVerb = MAKEINTRESOURCEA(id - p->idCmdFirst);
            ici.lpVerbW = (PWSTR)ici.lpVerb;
            return p->pCM->InvokeCommand((CMINVOKECOMMANDINFO*)&ici);
        }
    }
}
 
typedef struct _DynamicShellEntry_
{
    UINT iIdCmdFirst;
    UINT NumIds;
    CLSID ClassID;
    CComPtr<IContextMenu> pCM;
} DynamicShellEntry, *PDynamicShellEntry;
 
typedef struct _StaticShellEntry_
{
    CStringW Verb;
    HKEY hkClass;
} StaticShellEntry, *PStaticShellEntry;
 
#define DCM_FCIDM_SHVIEW_OFFSET 0x7000 // Offset from the menu ids in the menu resource to FCIDM_SHVIEW_*
 
//
// verbs for InvokeCommandInfo
//
static const struct _StaticInvokeCommandMap_
{
    LPCSTR szStringVerb;
    WORD IntVerb;
    SHORT DfmCmd;
} g_StaticInvokeCmdMap[] =
{
    // Note: Verbs from the registry should not be listed here
    { CMDSTR_NEWFOLDERA, FCIDM_SHVIEW_NEWFOLDER,  (SHORT)DFM_CMD_NEWFOLDER },
    { "cut",             FCIDM_SHVIEW_CUT,        /* ? */ },
    { "copy",            FCIDM_SHVIEW_COPY,       (SHORT)DFM_CMD_COPY },
    { "paste",           FCIDM_SHVIEW_INSERT,     (SHORT)DFM_CMD_PASTE },
    { "link",            FCIDM_SHVIEW_CREATELINK, (SHORT)DFM_CMD_LINK },
    { "delete",          FCIDM_SHVIEW_DELETE,     (SHORT)DFM_CMD_DELETE },
    { "properties",      FCIDM_SHVIEW_PROPERTIES, (SHORT)DFM_CMD_PROPERTIES },
    { "rename",          FCIDM_SHVIEW_RENAME,     (SHORT)DFM_CMD_RENAME },
};
 
PCSTR MapFcidmCmdToVerb(_In_ UINT_PTR CmdId)
{
    for (SIZE_T i = 0; i < _countof(g_StaticInvokeCmdMap); ++i)
    {
        if (g_StaticInvokeCmdMap[i].IntVerb == CmdId && CmdId)
            return g_StaticInvokeCmdMap[i].szStringVerb;
    }
    return NULL;
}
 
UINT MapVerbToDfmCmd(_In_ LPCSTR verba)
{
    for (UINT i = 0; i < _countof(g_StaticInvokeCmdMap); ++i)
    {
        if (!lstrcmpiA(g_StaticInvokeCmdMap[i].szStringVerb, verba))
            return (int)g_StaticInvokeCmdMap[i].DfmCmd;
    }
    return 0;
}
 
static HRESULT
MapVerbToCmdId(PVOID Verb, BOOL IsUnicode, IContextMenu *pCM, UINT idFirst, UINT idLast)
{
    const UINT gcs = IsUnicode ? GCS_VERBW : GCS_VERBA;
    for (UINT id = idFirst; id <= idLast; ++id)
    {
        WCHAR buf[MAX_PATH];
        *buf = UNICODE_NULL;
        HRESULT hr = pCM->GetCommandString(id, gcs, NULL, (LPSTR)buf, _countof(buf));
        if (FAILED(hr) || !*buf)
            continue;
        else if (IsUnicode && !_wcsicmp((LPWSTR)Verb, buf))
            return id;
        else if (!IsUnicode && !lstrcmpiA((LPSTR)Verb, (LPSTR)buf))
            return id;
    }
    return HRESULT_FROM_WIN32(ERROR_NOT_FOUND);
}
 
static inline bool IsVerbListSeparator(WCHAR Ch)
{
    return Ch == L' ' || Ch == L','; // learn.microsoft.com/en-us/windows/win32/shell/context-menu-handlers
}
 
static int FindVerbInDefaultVerbList(LPCWSTR List, LPCWSTR Verb)
{
    for (UINT index = 0; *List; ++index)
    {
        while (IsVerbListSeparator(*List))
            List++;
        LPCWSTR Start = List;
        while (*List && !IsVerbListSeparator(*List))
            List++;
        // "List > Start" to verify that the list item is non-empty to avoid the edge case where Verb is "" and the list contains ",,"
        if (!_wcsnicmp(Verb, Start, List - Start) && List > Start)
            return index;
    }
    return -1;
}
 
EXTERN_C HRESULT SHELL32_EnumDefaultVerbList(LPCWSTR List, UINT Index, LPWSTR Verb, SIZE_T cchMax)
{
    for (UINT i = 0; *List; ++i)
    {
        while (IsVerbListSeparator(*List))
            List++;
        LPCWSTR Start = List;
        while (*List && !IsVerbListSeparator(*List))
            List++;
        if (List > Start && i == Index)
            return StringCchCopyNW(Verb, cchMax, Start, List - Start);
    }
    return HRESULT_FROM_WIN32(ERROR_NO_MORE_ITEMS);
}
 
static HRESULT GetFriendlyVerb(_In_ PCWSTR pszVerb, _Out_ PWSTR pszBuf, _In_ SIZE_T cchMax)
{
    static const struct { PCWSTR pszVerb; WORD iResId; } map[] =
    {
        // { L"open", IDS_OPEN_VERB }, These two have already been handled
        // { L"explore", IDS_EXPLORE_VERB },
        { L"edit", IDS_EDIT_VERB },
        { L"print", IDS_PRINT_VERB },
        { L"runas", IDS_RUNAS_VERB },
        { L"openas", IDS_OPEN_VERB },
        { L"find", IDS_FIND_VERB },
    };
    for (SIZE_T i = 0; i < _countof(map); ++i)
    {
        if (!_wcsicmp(pszVerb, map[i].pszVerb) &&
            LoadStringW(shell32_hInstance, map[i].iResId, pszBuf, cchMax))
        {
            return S_OK;
        }
    }
 
    // Try to make a friendly verb based on the verb subkey
    if (pszVerb[0] < 127 && !StrChrW(pszVerb, '&') && SUCCEEDED(StringCchCopyW(pszBuf + 1, --cchMax, pszVerb)))
    {
        *pszBuf = L'&';
        return S_OK; // This can be changed to S_FALSE if the caller needs to know we faked it
    }
    return E_FAIL;
}
 
class CDefaultContextMenu :
    public CComObjectRootEx<CComMultiThreadModelNoCS>,
    public IContextMenu3,
    public IObjectWithSite,
    public IServiceProvider
{
    private:
        CComPtr<IUnknown> m_site;
        CComPtr<IShellFolder> m_psf;
        CComPtr<IContextMenuCB> m_pmcb;
        LPFNDFMCALLBACK m_pfnmcb;
        UINT m_cidl;
        PCUITEMID_CHILD_ARRAY m_apidl;
        CComPtr<IDataObject> m_pDataObj;
        HKEY m_aKeys[16]; // This limit is documented for both the old API and for DEFCONTEXTMENU
        UINT m_cKeys;
        PIDLIST_ABSOLUTE m_pidlFolder;
        DWORD m_bGroupPolicyActive;
        UINT m_iIdQCMFirst; /* The first id passed to us in QueryContextMenu */
        CAtlList<DynamicShellEntry> m_DynamicEntries;
        UINT m_iIdSHEFirst; /* first used id */
        UINT m_iIdSHELast; /* last used id */
        CAtlList<StaticShellEntry> m_StaticEntries;
        UINT m_iIdSCMFirst; /* first static used id */
        UINT m_iIdSCMLast; /* last static used id */
        UINT m_iIdCBFirst; /* first callback used id */
        UINT m_iIdCBLast;  /* last callback used id */
        UINT m_iIdDfltFirst; /* first default part id */
        UINT m_iIdDfltLast; /* last default part id */
        HWND m_hwnd; /* window passed to callback */
        WCHAR m_DefVerbs[MAX_PATH];
 
        HRESULT _DoCallback(UINT uMsg, WPARAM wParam, LPVOID lParam);
        HRESULT _DoInvokeCommandCallback(LPCMINVOKECOMMANDINFOEX lpcmi, WPARAM CmdId);
        void AddStaticEntry(const HKEY hkeyClass, const WCHAR *szVerb, UINT uFlags);
        void AddStaticEntriesForKey(HKEY hKey, UINT uFlags);
        void TryPickDefault(HMENU hMenu, UINT idCmdFirst, UINT DfltOffset, UINT uFlags);
        BOOL IsShellExtensionAlreadyLoaded(REFCLSID clsid);
        HRESULT LoadDynamicContextMenuHandler(HKEY hKey, REFCLSID clsid);
        BOOL EnumerateDynamicContextHandlerForKey(HKEY hRootKey);
        UINT AddShellExtensionsToMenu(HMENU hMenu, UINT* pIndexMenu, UINT idCmdFirst, UINT idCmdLast, UINT uFlags);
        UINT AddStaticContextMenusToMenu(HMENU hMenu, UINT* IndexMenu, UINT iIdCmdFirst, UINT iIdCmdLast, UINT uFlags);
        HRESULT DoPaste(LPCMINVOKECOMMANDINFOEX lpcmi, BOOL bLink);
        HRESULT DoCreateLink(LPCMINVOKECOMMANDINFOEX lpcmi);
        HRESULT DoDelete(LPCMINVOKECOMMANDINFOEX lpcmi);
        HRESULT DoCopyOrCut(LPCMINVOKECOMMANDINFOEX lpcmi, BOOL bCopy);
        HRESULT DoRename(LPCMINVOKECOMMANDINFOEX lpcmi);
        HRESULT DoProperties(LPCMINVOKECOMMANDINFOEX lpcmi);
        HRESULT DoUndo(LPCMINVOKECOMMANDINFOEX lpcmi);
        HRESULT DoCreateNewFolder(LPCMINVOKECOMMANDINFOEX lpici);
        HRESULT InvokeShellExt(LPCMINVOKECOMMANDINFOEX lpcmi);
        HRESULT InvokeRegVerb(LPCMINVOKECOMMANDINFOEX lpcmi);
        DWORD BrowserFlagsFromVerb(LPCMINVOKECOMMANDINFOEX lpcmi, PStaticShellEntry pEntry);
        HRESULT TryToBrowse(LPCMINVOKECOMMANDINFOEX lpcmi, LPCITEMIDLIST pidl, DWORD wFlags);
        HRESULT InvokePidl(LPCMINVOKECOMMANDINFOEX lpcmi, LPCITEMIDLIST pidl, PStaticShellEntry pEntry);
        PDynamicShellEntry GetDynamicEntry(UINT idCmd);
        BOOL MapVerbToCmdId(PVOID Verb, PUINT idCmd, BOOL IsUnicode);
 
        HRESULT GetNoAssocError()
        {
            return LOBYTE(GetVersion()) < 6 ? E_INVALIDARG : HResultFromWin32(ERROR_NO_ASSOCIATION);
        }
 
    public:
        CDefaultContextMenu();
        ~CDefaultContextMenu();
        HRESULT WINAPI Initialize(const DEFCONTEXTMENU *pdcm, LPFNDFMCALLBACK lpfn);
 
        // IContextMenu
        STDMETHOD(QueryContextMenu)(HMENU hMenu, UINT indexMenu, UINT idCmdFirst, UINT idCmdLast, UINT uFlags) override;
        STDMETHOD(InvokeCommand)(LPCMINVOKECOMMANDINFO lpcmi) override;
        STDMETHOD(GetCommandString)(UINT_PTR idCommand, UINT uFlags, UINT *lpReserved, LPSTR lpszName, UINT uMaxNameLen) override;
 
        // IContextMenu2
        STDMETHOD(HandleMenuMsg)(UINT uMsg, WPARAM wParam, LPARAM lParam) override;
 
        // IContextMenu3
        STDMETHOD(HandleMenuMsg2)(UINT uMsg, WPARAM wParam, LPARAM lParam, LRESULT *plResult) override;
 
        // IObjectWithSite
        STDMETHOD(SetSite)(IUnknown *pUnkSite) override;
        STDMETHOD(GetSite)(REFIID riid, void **ppvSite) override;
 
        // IServiceProvider
        STDMETHOD(QueryService)(REFGUID svc, REFIID riid, void**ppv) override
        {
            return IUnknown_QueryService(m_site, svc, riid, ppv);
        }
 
        BEGIN_COM_MAP(CDefaultContextMenu)
        COM_INTERFACE_ENTRY_IID(IID_IContextMenu, IContextMenu)
        COM_INTERFACE_ENTRY_IID(IID_IContextMenu2, IContextMenu2)
        COM_INTERFACE_ENTRY_IID(IID_IContextMenu3, IContextMenu3)
        COM_INTERFACE_ENTRY_IID(IID_IObjectWithSite, IObjectWithSite)
        COM_INTERFACE_ENTRY_IID(IID_IServiceProvider, IServiceProvider)
        END_COM_MAP()
};
 
CDefaultContextMenu::CDefaultContextMenu() :
    m_psf(NULL),
    m_pmcb(NULL),
    m_pfnmcb(NULL),
    m_cidl(0),
    m_apidl(NULL),
    m_pDataObj(NULL),
    m_cKeys(0),
    m_pidlFolder(NULL),
    m_bGroupPolicyActive(0),
    m_iIdQCMFirst(0),
    m_iIdSHEFirst(0),
    m_iIdSHELast(0),
    m_iIdSCMFirst(0),
    m_iIdSCMLast(0),
    m_iIdCBFirst(0),
    m_iIdCBLast(0),
    m_iIdDfltFirst(0),
    m_iIdDfltLast(0),
    m_hwnd(NULL)
{
    *m_DefVerbs = UNICODE_NULL;
}
 
CDefaultContextMenu::~CDefaultContextMenu()
{
    for (POSITION it = m_DynamicEntries.GetHeadPosition(); it != NULL;)
    {
        const DynamicShellEntry& info = m_DynamicEntries.GetNext(it);
        IUnknown_SetSite(info.pCM.p, NULL);
    }
    m_DynamicEntries.RemoveAll();
    m_StaticEntries.RemoveAll();
 
    for (UINT i = 0; i < m_cKeys; i++)
        RegCloseKey(m_aKeys[i]);
 
    if (m_pidlFolder)
        CoTaskMemFree(m_pidlFolder);
    _ILFreeaPidl(const_cast<PITEMID_CHILD *>(m_apidl), m_cidl);
}
 
HRESULT WINAPI CDefaultContextMenu::Initialize(const DEFCONTEXTMENU *pdcm, LPFNDFMCALLBACK lpfn)
{
    TRACE("cidl %u\n", pdcm->cidl);
 
    HRESULT hr = S_OK;
    if (!pdcm->pcmcb && !lpfn)
    {
        ERR("CDefaultContextMenu needs a callback!\n");
        return E_INVALIDARG;
    }
 
    m_cidl = pdcm->cidl;
    m_apidl = const_cast<PCUITEMID_CHILD_ARRAY>(_ILCopyaPidl(pdcm->apidl, m_cidl));
    if (m_cidl && !m_apidl)
        return E_OUTOFMEMORY;
    m_psf = pdcm->psf;
    m_pmcb = pdcm->pcmcb;
    m_pfnmcb = lpfn;
    m_hwnd = pdcm->hwnd;
 
    for (UINT i = 0; i < pdcm->cKeys; ++i)
    {
        if (i >= _countof(m_aKeys))
            hr = E_INVALIDARG;
        else if ((m_aKeys[i] = SHRegDuplicateHKey(pdcm->aKeys[i])) != NULL)
            m_cKeys++;
        else
            hr = E_OUTOFMEMORY;
    }
 
    m_psf->GetUIObjectOf(pdcm->hwnd, m_cidl, m_apidl, IID_NULL_PPV_ARG(IDataObject, &m_pDataObj));
 
    if (pdcm->pidlFolder)
    {
        m_pidlFolder = ILClone(pdcm->pidlFolder);
    }
    else
    {
        CComPtr<IPersistFolder2> pf = NULL;
        if (SUCCEEDED(m_psf->QueryInterface(IID_PPV_ARG(IPersistFolder2, &pf))))
        {
            if (FAILED(pf->GetCurFolder(&m_pidlFolder)))
                ERR("GetCurFolder failed\n");
        }
        TRACE("pidlFolder %p\n", m_pidlFolder);
    }
 
    return hr;
}
 
HRESULT CDefaultContextMenu::_DoCallback(UINT uMsg, WPARAM wParam, LPVOID lParam)
{
    if (m_pmcb)
    {
        return m_pmcb->CallBack(m_psf, m_hwnd, m_pDataObj, uMsg, wParam, (LPARAM)lParam);
    }
    else if(m_pfnmcb)
    {
        return m_pfnmcb(m_psf, m_hwnd, m_pDataObj, uMsg, wParam, (LPARAM)lParam);
    }
 
    return E_FAIL;
}
 
void CDefaultContextMenu::AddStaticEntry(const HKEY hkeyClass, const WCHAR *szVerb, UINT uFlags)
{
    POSITION it = m_StaticEntries.GetHeadPosition();
    while (it != NULL)
    {
        const StaticShellEntry& info = m_StaticEntries.GetNext(it);
        if (info.Verb.CompareNoCase(szVerb) == 0)
        {
            /* entry already exists */
            return;
        }
    }
 
    TRACE("adding verb %s\n", debugstr_w(szVerb));
 
    if (!_wcsicmp(szVerb, L"open") && !(uFlags & CMF_NODEFAULT))
    {
        /* open verb is always inserted in front */
        m_StaticEntries.AddHead({ szVerb, hkeyClass });
    }
    else
    {
        m_StaticEntries.AddTail({ szVerb, hkeyClass });
    }
}
 
void CDefaultContextMenu::AddStaticEntriesForKey(HKEY hKey, UINT uFlags)
{
    WCHAR wszName[VERBKEY_CCHMAX];
    DWORD cchName, dwIndex = 0;
    HKEY hShellKey;
 
    LRESULT lres = RegOpenKeyExW(hKey, L"shell", 0, KEY_READ, &hShellKey);
    if (lres != STATUS_SUCCESS)
        return;
 
    if (!*m_DefVerbs)
    {
        DWORD cb = sizeof(m_DefVerbs);
        RegGetValueW(hShellKey, NULL, NULL, RRF_RT_REG_SZ, NULL, m_DefVerbs, &cb);
    }
 
    while(TRUE)
    {
        cchName = _countof(wszName);
        if (RegEnumKeyExW(hShellKey, dwIndex++, wszName, &cchName, NULL, NULL, NULL, NULL) != ERROR_SUCCESS)
            break;
 
        AddStaticEntry(hKey, wszName, uFlags);
    }
 
    RegCloseKey(hShellKey);
}
 
static
BOOL
HasClipboardData()
{
    BOOL bRet = FALSE;
    CComPtr<IDataObject> pDataObj;
 
    if (SUCCEEDED(OleGetClipboard(&pDataObj)))
    {
        FORMATETC formatetc;
 
        TRACE("pDataObj=%p\n", pDataObj.p);
 
        /* Set the FORMATETC structure*/
        InitFormatEtc(formatetc, RegisterClipboardFormatW(CFSTR_SHELLIDLIST), TYMED_HGLOBAL);
        bRet = SUCCEEDED(pDataObj->QueryGetData(&formatetc));
    }
 
    return bRet;
}
 
BOOL
CDefaultContextMenu::IsShellExtensionAlreadyLoaded(REFCLSID clsid)
{
    POSITION it = m_DynamicEntries.GetHeadPosition();
    while (it != NULL)
    {
        const DynamicShellEntry& info = m_DynamicEntries.GetNext(it);
        if (info.ClassID == clsid)
            return TRUE;
    }
 
    return FALSE;
}
 
HRESULT
CDefaultContextMenu::LoadDynamicContextMenuHandler(HKEY hKey, REFCLSID clsid)
{
    HRESULT hr;
    TRACE("LoadDynamicContextMenuHandler entered with This %p hKey %p pclsid %s\n", this, hKey, wine_dbgstr_guid(&clsid));
 
    if (IsShellExtensionAlreadyLoaded(clsid))
        return S_OK;
 
    CComPtr<IContextMenu> pcm;
    hr = SHCoCreateInstance(NULL, &clsid, NULL, IID_PPV_ARG(IContextMenu, &pcm));
    if (FAILED(hr))
    {
        ERR("SHCoCreateInstance(IContextMenu) failed.clsid %s hr 0x%x\n", wine_dbgstr_guid(&clsid), hr);
        return hr;
    }
 
    CComPtr<IShellExtInit> pExtInit;
    hr = pcm->QueryInterface(IID_PPV_ARG(IShellExtInit, &pExtInit));
    if (FAILED(hr))
    {
        ERR("IContextMenu->QueryInterface(IShellExtInit) failed.clsid %s hr 0x%x\n", wine_dbgstr_guid(&clsid), hr);
        return hr;
    }
 
    hr = pExtInit->Initialize(m_pDataObj ? NULL : m_pidlFolder, m_pDataObj, hKey);
    if (FAILED(hr))
    {
        WARN("IShellExtInit::Initialize failed.clsid %s hr 0x%x\n", wine_dbgstr_guid(&clsid), hr);
        return hr;
    }
 
    if (m_site)
        IUnknown_SetSite(pcm, m_site);
 
    m_DynamicEntries.AddTail({ 0, 0, clsid, pcm });
 
    return S_OK;
}
 
BOOL
CDefaultContextMenu::EnumerateDynamicContextHandlerForKey(HKEY hRootKey)
{
    WCHAR wszName[MAX_PATH], wszBuf[MAX_PATH], *pwszClsid;
    DWORD cchName;
    HRESULT hr;
    HKEY hKey;
 
    if (RegOpenKeyExW(hRootKey, L"shellex\\ContextMenuHandlers", 0, KEY_READ, &hKey) != ERROR_SUCCESS)
    {
        TRACE("RegOpenKeyExW failed\n");
        return FALSE;
    }
 
    DWORD dwIndex = 0;
    while (TRUE)
    {
        cchName = _countof(wszName);
        if (RegEnumKeyExW(hKey, dwIndex++, wszName, &cchName, NULL, NULL, NULL, NULL) != ERROR_SUCCESS)
            break;
 
        /* Key name or key value is CLSID */
        CLSID clsid;
        hr = CLSIDFromString(wszName, &clsid);
        if (hr == S_OK)
            pwszClsid = wszName;
        else
        {
            DWORD cchBuf = _countof(wszBuf);
            if (RegGetValueW(hKey, wszName, NULL, RRF_RT_REG_SZ, NULL, wszBuf, &cchBuf) == ERROR_SUCCESS)
                hr = CLSIDFromString(wszBuf, &clsid);
            pwszClsid = wszBuf;
        }
 
        if (FAILED(hr))
        {
            ERR("CLSIDFromString failed for clsid %S hr 0x%x\n", pwszClsid, hr);
            continue;
        }
 
        if (m_bGroupPolicyActive)
        {
            if (RegGetValueW(HKEY_LOCAL_MACHINE,
                             L"Software\\Microsoft\\Windows\\CurrentVersion\\Shell Extensions\\Approved",
                             pwszClsid,
                             RRF_RT_REG_SZ,
                             NULL,
                             NULL,
                             NULL) != ERROR_SUCCESS)
            {
                ERR("Shell extension %s not approved!\n", pwszClsid);
                continue;
            }
        }
 
        hr = LoadDynamicContextMenuHandler(hRootKey, clsid);
        if (FAILED(hr))
            WARN("Failed to get context menu entires from shell extension! clsid: %S\n", pwszClsid);
    }
 
    RegCloseKey(hKey);
    return TRUE;
}
 
UINT
CDefaultContextMenu::AddShellExtensionsToMenu(HMENU hMenu, UINT* pIndexMenu, UINT idCmdFirst, UINT idCmdLast, UINT uFlags)
{
    UINT cIds = 0;
 
    if (m_DynamicEntries.IsEmpty())
        return cIds;
 
    POSITION it = m_DynamicEntries.GetHeadPosition();
    while (it != NULL)
    {
        DynamicShellEntry& info = m_DynamicEntries.GetNext(it);
 
        HRESULT hr = info.pCM->QueryContextMenu(hMenu, *pIndexMenu, idCmdFirst + cIds, idCmdLast, uFlags);
        if (SUCCEEDED(hr))
        {
            info.iIdCmdFirst = cIds;
            info.NumIds = HRESULT_CODE(hr);
            (*pIndexMenu) += info.NumIds;
 
            cIds += info.NumIds;
            if (idCmdFirst + cIds >= idCmdLast)
                break;
        }
        TRACE("pEntry hr %x contextmenu %p cmdfirst %x num ids %x\n", hr, info.pCM.p, info.iIdCmdFirst, info.NumIds);
    }
    return cIds;
}
 
UINT
CDefaultContextMenu::AddStaticContextMenusToMenu(
    HMENU hMenu,
    UINT* pIndexMenu,
    UINT iIdCmdFirst,
    UINT iIdCmdLast,
    UINT uFlags)
{
    UINT ntver = RosGetProcessEffectiveVersion();
    MENUITEMINFOW mii = { sizeof(mii) };
    WCHAR wszDispVerb[80]; // The limit on XP. If the friendly string is longer, it falls back to the verb key.
    UINT fState, idVerbRes;
    UINT cIds = 0, indexFirst = *pIndexMenu, indexDefault;
    int iDefVerbIndex = -1;
 
    mii.fMask = MIIM_ID | MIIM_TYPE | MIIM_STATE | MIIM_DATA;
    mii.fType = MFT_STRING;
 
    POSITION it = m_StaticEntries.GetHeadPosition();
    bool first = true;
    while (it != NULL)
    {
        StaticShellEntry& info = m_StaticEntries.GetNext(it);
        BOOL forceFirstPos = FALSE;
        bool hide = false;
 
        fState = MFS_ENABLED;
 
        /* set first entry as default */
        if (first)
        {
            fState |= MFS_DEFAULT;
            first = false;
        }
 
        if (info.Verb.CompareNoCase(L"open") == 0)
        {
            idVerbRes = IDS_OPEN_VERB;
            fState |= MFS_DEFAULT; /* override default when open verb is found */
            forceFirstPos++;
        }
        else if (info.Verb.CompareNoCase(L"explore") == 0)
        {
            idVerbRes = IDS_EXPLORE_VERB;
            if (uFlags & CMF_EXPLORE)
            {
                fState |= MFS_DEFAULT;
                forceFirstPos++;
            }
        }
        else if (info.Verb.CompareNoCase(L"printto") == 0)
            hide = true;
        else
            idVerbRes = 0;
 
        /* By default use verb for menu item name */
        mii.dwTypeData = (LPWSTR)info.Verb.GetString();
 
        WCHAR wszKey[sizeof("shell\\") + MAX_VERB];
        HRESULT hr = StringCbPrintfW(wszKey, sizeof(wszKey), L"shell\\%s", info.Verb.GetString());
        if (FAILED_UNEXPECTEDLY(hr))
            hide = true;
 
        UINT cmdFlags = 0;
        HKEY hkVerb;
        if (RegOpenKeyExW(info.hkClass, wszKey, 0, KEY_READ, &hkVerb) == ERROR_SUCCESS)
        {
            if (!(uFlags & CMF_OPTIMIZEFORINVOKE))
            {
                DWORD cbVerb = sizeof(wszDispVerb);
                LONG res = RegLoadMUIStringW(hkVerb, L"MUIVerb", wszDispVerb, cbVerb, NULL, 0, NULL);
                if (res || !*wszDispVerb)
                    res = RegLoadMUIStringW(hkVerb, NULL, wszDispVerb, cbVerb, NULL, 0, NULL);
 
                if ((res == ERROR_SUCCESS && *wszDispVerb) ||
                    (idVerbRes && LoadStringW(shell32_hInstance, idVerbRes, wszDispVerb, _countof(wszDispVerb))) ||
                    SUCCEEDED(GetFriendlyVerb(info.Verb, wszDispVerb, _countof(wszDispVerb))))
                {
                    mii.dwTypeData = wszDispVerb;
                }
            }
        }
        else
        {
            hkVerb = NULL;
        }
 
        if (hkVerb)
        {
            if (!hide && !(uFlags & CMF_EXTENDEDVERBS))
                hide = RegValueExists(hkVerb, L"Extended");
 
            if (!hide)
                hide = RegValueExists(hkVerb, L"ProgrammaticAccessOnly");
 
            if (!hide && !(uFlags & CMF_DISABLEDVERBS))
                hide = RegValueExists(hkVerb, L"LegacyDisable");
 
            if (DWORD dwRest = (hide ? 0 : RegGetDword(hkVerb, NULL, L"SuppressionPolicy", 0)))
                hide = SHRestricted((RESTRICTIONS)dwRest);
 
            if (RegValueExists(hkVerb, L"NeverDefault"))
                fState &= ~MFS_DEFAULT;
 
            if (RegValueExists(hkVerb, L"SeparatorBefore"))
                cmdFlags |= ECF_SEPARATORBEFORE;
            if (RegValueExists(hkVerb, L"SeparatorAfter"))
                cmdFlags |= ECF_SEPARATORAFTER;
 
            RegCloseKey(hkVerb);
        }
 
        if (((uFlags & CMF_NODEFAULT) && ntver >= _WIN32_WINNT_VISTA) ||
            ((uFlags & CMF_DONOTPICKDEFAULT) && ntver >= _WIN32_WINNT_WIN7))
        {
            fState &= ~MFS_DEFAULT;
        }
 
        if (!hide)
        {
            if (cmdFlags & ECF_SEPARATORBEFORE)
            {
                if (InsertMenuItemAt(hMenu, *pIndexMenu, MF_SEPARATOR))
                    (*pIndexMenu)++;
            }
 
            UINT pos = *pIndexMenu;
            int verbIndex = hkVerb ? FindVerbInDefaultVerbList(m_DefVerbs, info.Verb) : -1;
            if (verbIndex >= 0)
            {
                if (verbIndex < iDefVerbIndex || iDefVerbIndex < 0)
                {
                    iDefVerbIndex = verbIndex;
                    fState |= MFS_DEFAULT;
                    forceFirstPos = TRUE;
                }
                else
                {
                    fState &= ~MFS_DEFAULT; // We have already set a better default
                    pos = indexDefault;
                }
            }
            else if (iDefVerbIndex >= 0)
            {
                fState &= ~MFS_DEFAULT; // We have already set the default
                if (forceFirstPos)
                    pos = indexDefault;
                forceFirstPos = FALSE;
            }
 
            mii.fState = fState;
            mii.wID = iIdCmdFirst + cIds;
            if (InsertMenuItemW(hMenu, forceFirstPos ? indexFirst : pos, TRUE, &mii))
                (*pIndexMenu)++;
 
            if (cmdFlags & ECF_SEPARATORAFTER)
            {
                if (InsertMenuItemAt(hMenu, *pIndexMenu, MF_SEPARATOR))
                    (*pIndexMenu)++;
            }
 
            if (fState & MFS_DEFAULT)
                indexDefault = *pIndexMenu; // This is where we want to insert "high priority" verbs
        }
        cIds++; // Always increment the id because it acts as the index into m_StaticEntries
 
        if (mii.wID >= iIdCmdLast)
            break;
    }
 
    return cIds;
}
 
BOOL WINAPI _InsertMenuItemW(
    HMENU hMenu,
    UINT indexMenu,
    BOOL fByPosition,
    UINT wID,
    UINT fType,
    LPCWSTR dwTypeData,
    UINT fState)
{
    MENUITEMINFOW mii;
    WCHAR wszText[100];
 
    ZeroMemory(&mii, sizeof(mii));
    mii.cbSize = sizeof(mii);
    if (fType == MFT_SEPARATOR)
        mii.fMask = MIIM_ID | MIIM_TYPE;
    else if (fType == MFT_STRING)
    {
        mii.fMask = MIIM_ID | MIIM_TYPE | MIIM_STATE;
        if (IS_INTRESOURCE(dwTypeData))
        {
            if (LoadStringW(shell32_hInstance, LOWORD((ULONG_PTR)dwTypeData), wszText, _countof(wszText)))
                mii.dwTypeData = wszText;
            else
            {
                ERR("failed to load string %p\n", dwTypeData);
                return FALSE;
            }
        }
        else
            mii.dwTypeData = (LPWSTR)dwTypeData;
        mii.fState = fState;
    }
 
    mii.wID = wID;
    mii.fType = fType;
    return InsertMenuItemW(hMenu, indexMenu, fByPosition, &mii);
}
 
void
CDefaultContextMenu::TryPickDefault(HMENU hMenu, UINT idCmdFirst, UINT DfltOffset, UINT uFlags)
{
    // Are we allowed to pick a default?
    if ((uFlags & CMF_NODEFAULT) ||
        ((uFlags & CMF_DONOTPICKDEFAULT) && RosGetProcessEffectiveVersion() >= _WIN32_WINNT_WIN7))
    {
        return;
    }
 
    // Do we already have a default?
    if ((int)GetMenuDefaultItem(hMenu, MF_BYPOSITION, 0) != -1)
        return;
 
    // Does the view want to pick one?
    INT_PTR forceDfm = 0;
    if (SUCCEEDED(_DoCallback(DFM_GETDEFSTATICID, 0, &forceDfm)) && forceDfm)
    {
        for (UINT i = 0; i < _countof(g_StaticInvokeCmdMap); ++i)
        {
            UINT menuItemId = g_StaticInvokeCmdMap[i].IntVerb + DfltOffset - DCM_FCIDM_SHVIEW_OFFSET;
            if (g_StaticInvokeCmdMap[i].DfmCmd == forceDfm &&
                SetMenuDefaultItem(hMenu, menuItemId, MF_BYCOMMAND))
            {
                return;
            }
        }
    }
 
    // Don't want to pick something like cut or delete as the default but
    // a static or dynamic verb is a good default.
    if (m_iIdSCMLast > m_iIdSCMFirst || m_iIdSHELast > m_iIdSHEFirst)
        SetMenuDefaultItem(hMenu, idCmdFirst, MF_BYCOMMAND);
}
 
HRESULT
WINAPI
CDefaultContextMenu::QueryContextMenu(
    HMENU hMenu,
    UINT IndexMenu,
    UINT idCmdFirst,
    UINT idCmdLast,
    UINT uFlags)
{
    HRESULT hr;
    UINT idCmdNext = m_iIdQCMFirst = idCmdFirst;
    UINT cIds = 0;
 
    TRACE("BuildShellItemContextMenu entered\n");
 
    /* Load static verbs and shell extensions from registry */
    for (UINT i = 0; i < m_cKeys && !(uFlags & CMF_NOVERBS); i++)
    {
        AddStaticEntriesForKey(m_aKeys[i], uFlags);
        EnumerateDynamicContextHandlerForKey(m_aKeys[i]);
    }
 
    /* Add static context menu handlers */
    cIds = AddStaticContextMenusToMenu(hMenu, &IndexMenu, idCmdFirst, idCmdLast, uFlags);
    m_iIdSCMFirst = 0; // FIXME: This should be = idCmdFirst?
    m_iIdSCMLast = cIds;
    idCmdNext = idCmdFirst + cIds;
 
    /* Add dynamic context menu handlers */
    cIds += AddShellExtensionsToMenu(hMenu, &IndexMenu, idCmdNext, idCmdLast, uFlags);
    m_iIdSHEFirst = m_iIdSCMLast;
    m_iIdSHELast = cIds;
    idCmdNext = idCmdFirst + cIds;
    TRACE("SH_LoadContextMenuHandlers first %x last %x\n", m_iIdSHEFirst, m_iIdSHELast);
 
    /* Now let the callback add its own items */
    QCMINFO qcminfo = {hMenu, IndexMenu, idCmdNext, idCmdLast, NULL};
    if (SUCCEEDED(_DoCallback(DFM_MERGECONTEXTMENU, uFlags, &qcminfo)))
    {
        UINT added = qcminfo.idCmdFirst - idCmdNext;
        cIds += added;
        IndexMenu += added; // Note: This is incorrect, forgets about separators and causes CORE-18577. We should build the menu in reverse order like Windows...
        m_iIdCBFirst = m_iIdSHELast;
        m_iIdCBLast = cIds;
        idCmdNext = idCmdFirst + cIds;
    }
 
    //TODO: DFM_MERGECONTEXTMENU_BOTTOM
 
    UINT idDefaultOffset = 0;
    BOOL isBackgroundMenu = !m_cidl;
    if (!(uFlags & CMF_VERBSONLY) && !isBackgroundMenu)
    {
        /* Get the attributes of the items */
        SFGAOF rfg = SFGAO_BROWSABLE | SFGAO_CANCOPY | SFGAO_CANLINK | SFGAO_CANMOVE | SFGAO_CANDELETE | SFGAO_CANRENAME | SFGAO_HASPROPSHEET | SFGAO_FILESYSTEM | SFGAO_FOLDER;
        hr = m_psf->GetAttributesOf(m_cidl, m_apidl, &rfg);
        if (FAILED_UNEXPECTEDLY(hr))
            return MAKE_HRESULT(SEVERITY_SUCCESS, 0, cIds);
 
        /* Add the default part of the menu */
        HMENU hmenuDefault = LoadMenuW(_AtlBaseModule.GetResourceInstance(), MAKEINTRESOURCEW(MENU_SHV_FILE));
 
        /* Remove uneeded entries */
        if (!(rfg & SFGAO_CANMOVE))
            DeleteMenu(hmenuDefault, IDM_CUT, MF_BYCOMMAND);
        if (!(rfg & SFGAO_CANCOPY))
            DeleteMenu(hmenuDefault, IDM_COPY, MF_BYCOMMAND);
        if (!((rfg & SFGAO_FILESYSTEM) && HasClipboardData()))
            DeleteMenu(hmenuDefault, IDM_INSERT, MF_BYCOMMAND);
        if (!(rfg & SFGAO_CANLINK))
            DeleteMenu(hmenuDefault, IDM_CREATELINK, MF_BYCOMMAND);
        if (!(rfg & SFGAO_CANDELETE))
            DeleteMenu(hmenuDefault, IDM_DELETE, MF_BYCOMMAND);
        if (!(rfg & SFGAO_CANRENAME) || !(uFlags & CMF_CANRENAME))
            DeleteMenu(hmenuDefault, IDM_RENAME, MF_BYCOMMAND);
        if (!(rfg & SFGAO_HASPROPSHEET))
            DeleteMenu(hmenuDefault, IDM_PROPERTIES, MF_BYCOMMAND);
 
        idDefaultOffset = idCmdNext;
        UINT idMax = Shell_MergeMenus(hMenu, GetSubMenu(hmenuDefault, 0), IndexMenu, idCmdNext, idCmdLast, 0);
        m_iIdDfltFirst = cIds;
        cIds += idMax - idCmdNext;
        m_iIdDfltLast = cIds;
 
        DestroyMenu(hmenuDefault);
    }
 
    TryPickDefault(hMenu, idCmdFirst, idDefaultOffset, uFlags);
 
    // TODO: DFM_MERGECONTEXTMENU_TOP
 
    // TODO: Remove duplicate verbs. This will be easier when the static items handling
    // has been moved to CLSID_ShellFileDefExt so we only have to deal with ShellEx.
    // This is a Windows XP+ feature. On an unknown file type, Windows 2000 will
    // display both "Open" (openas from Unknown) and "Open with..." (openas from *).
 
    return MAKE_HRESULT(SEVERITY_SUCCESS, 0, cIds);
}
 
HRESULT CDefaultContextMenu::DoPaste(LPCMINVOKECOMMANDINFOEX lpcmi, BOOL bLink)
{
    HRESULT hr = _DoInvokeCommandCallback(lpcmi, DFM_CMD_PASTE);
    if (hr == S_OK)
        return hr;
 
    CComPtr<IDataObject> pda;
    hr = OleGetClipboard(&pda);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    FORMATETC formatetc2;
    STGMEDIUM medium2;
    InitFormatEtc(formatetc2, RegisterClipboardFormatW(CFSTR_PREFERREDDROPEFFECT), TYMED_HGLOBAL);
 
    DWORD dwKey= 0;
 
    if (SUCCEEDED(pda->GetData(&formatetc2, &medium2)))
    {
        DWORD * pdwFlag = (DWORD*)GlobalLock(medium2.hGlobal);
        if (pdwFlag)
        {
            if (*pdwFlag == DROPEFFECT_COPY)
                dwKey = MK_CONTROL;
            else
                dwKey = MK_SHIFT;
        }
        else
        {
            ERR("No drop effect obtained\n");
        }
        GlobalUnlock(medium2.hGlobal);
    }
 
    if (bLink)
    {
        dwKey = MK_CONTROL|MK_SHIFT;
    }
 
    CComPtr<IDropTarget> pdrop;
    if (m_cidl)
        hr = m_psf->GetUIObjectOf(NULL, 1, &m_apidl[0], IID_NULL_PPV_ARG(IDropTarget, &pdrop));
    else
        hr = m_psf->CreateViewObject(NULL, IID_PPV_ARG(IDropTarget, &pdrop));
 
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    SHSimulateDrop(pdrop, pda, dwKey, NULL, NULL);
 
    TRACE("CP result %x\n", hr);
    return S_OK;
}
 
HRESULT CDefaultContextMenu::DoCreateLink(LPCMINVOKECOMMANDINFOEX lpcmi)
{
    HRESULT hr = _DoInvokeCommandCallback(lpcmi, DFM_CMD_LINK);
    if (hr == S_OK)
        return hr;
 
    if (!m_cidl || !m_pDataObj)
        return E_FAIL;
 
    CComPtr<IDropTarget> pDT;
    hr = m_psf->CreateViewObject(NULL, IID_PPV_ARG(IDropTarget, &pDT));
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    SHSimulateDrop(pDT, m_pDataObj, MK_CONTROL|MK_SHIFT, NULL, NULL);
 
    return S_OK;
}
 
HRESULT CDefaultContextMenu::DoDelete(LPCMINVOKECOMMANDINFOEX lpcmi)
{
    HRESULT hr = _DoInvokeCommandCallback(lpcmi, DFM_CMD_DELETE);
    if (hr == S_OK)
        return hr;
 
    if (!m_cidl || !m_pDataObj)
        return E_FAIL;
 
    CComPtr<IDropTarget> pDT;
    hr = CRecyclerDropTarget_CreateInstance(IID_PPV_ARG(IDropTarget, &pDT));
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    DWORD grfKeyState = (lpcmi->fMask & CMIC_MASK_SHIFT_DOWN) ? MK_SHIFT : 0;
    SHSimulateDrop(pDT, m_pDataObj, grfKeyState, NULL, NULL);
 
    return S_OK;
}
 
HRESULT CDefaultContextMenu::DoCopyOrCut(LPCMINVOKECOMMANDINFOEX lpcmi, BOOL bCopy)
{
    if (!m_cidl || !m_pDataObj)
        return E_FAIL;
 
    HRESULT hr = _DoInvokeCommandCallback(lpcmi, bCopy ? DFM_CMD_COPY : DFM_CMD_MOVE);
    if (hr == S_OK)
        return hr;
 
    FORMATETC formatetc;
    InitFormatEtc(formatetc, RegisterClipboardFormatW(CFSTR_PREFERREDDROPEFFECT), TYMED_HGLOBAL);
    STGMEDIUM medium = {0};
    medium.tymed = TYMED_HGLOBAL;
    medium.hGlobal = GlobalAlloc(GHND, sizeof(DWORD));
    DWORD* pdwFlag = (DWORD*)GlobalLock(medium.hGlobal);
    if (pdwFlag)
        *pdwFlag = bCopy ? DROPEFFECT_COPY : DROPEFFECT_MOVE;
    GlobalUnlock(medium.hGlobal);
    m_pDataObj->SetData(&formatetc, &medium, TRUE);
 
    CComPtr<IShellFolderView> psfv;
    if (SUCCEEDED(IUnknown_QueryService(m_site, SID_SFolderView, IID_PPV_ARG(IShellFolderView, &psfv))))
        psfv->SetPoints(m_pDataObj);
 
    hr = OleSetClipboard(m_pDataObj);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    if (psfv)
        psfv->SetClipboard(!bCopy);
    return S_OK;
}
 
HRESULT CDefaultContextMenu::DoRename(LPCMINVOKECOMMANDINFOEX lpcmi)
{
    CComPtr<IShellBrowser> psb;
    HRESULT hr;
 
    hr = _DoInvokeCommandCallback(lpcmi, DFM_CMD_RENAME);
    if (hr == S_OK)
        return hr;
 
    if (!m_site || !m_cidl)
        return E_FAIL;
 
    /* Get a pointer to the shell browser */
    hr = IUnknown_QueryService(m_site, SID_IShellBrowser, IID_PPV_ARG(IShellBrowser, &psb));
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    CComPtr<IShellView> lpSV;
    hr = psb->QueryActiveShellView(&lpSV);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    SVSIF selFlags = SVSI_DESELECTOTHERS | SVSI_EDIT | SVSI_ENSUREVISIBLE | SVSI_FOCUSED | SVSI_SELECT;
    hr = lpSV->SelectItem(m_apidl[0], selFlags);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    return S_OK;
}
 
HRESULT
CDefaultContextMenu::DoProperties(
    LPCMINVOKECOMMANDINFOEX lpcmi)
{
    HRESULT hr = _DoInvokeCommandCallback(lpcmi, DFM_CMD_PROPERTIES);
 
    // We are asked to run the default property sheet
    if (hr == S_FALSE)
    {
        return SHELL32_ShowPropertiesDialog(m_pDataObj);
    }
 
    return hr;
}
 
HRESULT
CDefaultContextMenu::DoUndo(LPCMINVOKECOMMANDINFOEX lpcmi)
{
    ERR("TODO: Undo\n");
    return E_NOTIMPL;
}
 
// This code is taken from CNewMenu and should be shared between the 2 classes
HRESULT
CDefaultContextMenu::DoCreateNewFolder(
    LPCMINVOKECOMMANDINFOEX lpici)
{
    WCHAR wszPath[MAX_PATH];
    WCHAR wszName[MAX_PATH];
    WCHAR wszNewFolder[25];
    HRESULT hr;
 
    /* Get folder path */
    hr = SHGetPathFromIDListW(m_pidlFolder, wszPath);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    if (!LoadStringW(shell32_hInstance, IDS_NEWFOLDER, wszNewFolder, _countof(wszNewFolder)))
        return E_FAIL;
 
    /* Create the name of the new directory */
    if (!PathYetAnotherMakeUniqueName(wszName, wszPath, NULL, wszNewFolder))
        return E_FAIL;
 
    /* Create the new directory and show the appropriate dialog in case of error */
    if (SHCreateDirectory(lpici->hwnd, wszName) != ERROR_SUCCESS)
        return E_FAIL;
 
    /* Show and select the new item in the def view */
    LPITEMIDLIST pidl;
    PITEMID_CHILD pidlNewItem;
    CComPtr<IShellView> psv;
 
    /* Notify the view object about the new item */
    SHChangeNotify(SHCNE_MKDIR, SHCNF_PATHW | SHCNF_FLUSH, (LPCVOID)wszName, NULL);
 
    if (!m_site)
        return S_OK;
 
    /* Get a pointer to the shell view */
    hr = IUnknown_QueryService(m_site, SID_SFolderView, IID_PPV_ARG(IShellView, &psv));
    if (FAILED_UNEXPECTEDLY(hr))
        return S_OK;
 
    /* Attempt to get the pidl of the new item */
    hr = SHILCreateFromPathW(wszName, &pidl, NULL);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    pidlNewItem = ILFindLastID(pidl);
 
    hr = psv->SelectItem(pidlNewItem, SVSI_DESELECTOTHERS | SVSI_EDIT | SVSI_ENSUREVISIBLE |
                          SVSI_FOCUSED | SVSI_SELECT);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    SHFree(pidl);
 
    return S_OK;
}
 
PDynamicShellEntry CDefaultContextMenu::GetDynamicEntry(UINT idCmd)
{
    POSITION it = m_DynamicEntries.GetHeadPosition();
    while (it != NULL)
    {
        DynamicShellEntry& info = m_DynamicEntries.GetNext(it);
 
        if (idCmd >= info.iIdCmdFirst + info.NumIds)
            continue;
 
        if (idCmd < info.iIdCmdFirst || idCmd > info.iIdCmdFirst + info.NumIds)
            return NULL;
 
        return &info;
    }
 
    return NULL;
}
 
BOOL
CDefaultContextMenu::MapVerbToCmdId(PVOID Verb, PUINT idCmd, BOOL IsUnicode)
{
    WCHAR UnicodeStr[MAX_VERB];
    UINT i;
 
    /* Loop through all the static verbs looking for a match */
    for (i = 0; i < _countof(g_StaticInvokeCmdMap); i++)
    {
        if (IsUnicode)
        {
            SHAnsiToUnicode(g_StaticInvokeCmdMap[i].szStringVerb, UnicodeStr, MAX_VERB);
            if (!_wcsicmp(UnicodeStr, (LPWSTR)Verb))
            {
                *idCmd = g_StaticInvokeCmdMap[i].IntVerb;
                return TRUE;
            }
        }
        else
        {
            if (!_stricmp(g_StaticInvokeCmdMap[i].szStringVerb, (LPSTR)Verb))
            {
                *idCmd = g_StaticInvokeCmdMap[i].IntVerb;
                return TRUE;
            }
        }
    }
 
    POSITION it;
    HRESULT hr = S_OK;
    // Check the registry verbs
    if (!IsUnicode)
        hr = StringCchPrintfW(UnicodeStr, _countof(UnicodeStr), L"%hs", Verb);
    for (i = 0, it = m_StaticEntries.GetHeadPosition(); it && SUCCEEDED(hr); ++i)
    {
        StaticShellEntry& entry = m_StaticEntries.GetNext(it);
        if (!_wcsicmp(entry.Verb, UnicodeStr))
        {
            *idCmd = m_iIdSCMFirst + i;
            return TRUE;
        }
    }
 
    for (it = m_DynamicEntries.GetHeadPosition(); it != NULL;)
    {
        DynamicShellEntry& entry = m_DynamicEntries.GetNext(it);
        if (!entry.NumIds)
            continue;
        HRESULT hr = ::MapVerbToCmdId(Verb, IsUnicode, entry.pCM, 0, entry.NumIds - 1);
        if (SUCCEEDED(hr))
        {
            *idCmd = m_iIdSHEFirst + entry.iIdCmdFirst + hr;
            return TRUE;
        }
    }
 
    // learn.microsoft.com/en-us/windows/win32/shell/dfm-mapcommandname
    PWSTR pszVerbW = (PWSTR)Verb;
    if (!IsUnicode)
    {
        SHAnsiToUnicode((PCSTR)Verb, UnicodeStr, _countof(UnicodeStr));
        pszVerbW = UnicodeStr;
    }
    i = -1;
    if (*pszVerbW && SUCCEEDED(_DoCallback(DFM_MAPCOMMANDNAME, (WPARAM)&i, pszVerbW)) && !HIWORD(i))
    {
        *idCmd = m_iIdCBFirst + i;
        return TRUE;
    }
 
    return FALSE; // Note: Even if the verb is "open", we must fail if we can't find a handler
}
 
HRESULT
CDefaultContextMenu::InvokeShellExt(
    LPCMINVOKECOMMANDINFOEX lpcmi)
{
    TRACE("verb %p first %x last %x\n", lpcmi->lpVerb, m_iIdSHEFirst, m_iIdSHELast);
 
    UINT idCmd = LOWORD(lpcmi->lpVerb);
    PDynamicShellEntry pEntry = GetDynamicEntry(idCmd);
    if (!pEntry)
        return E_FAIL;
 
    /* invoke the dynamic context menu */
    lpcmi->lpVerb = MAKEINTRESOURCEA(idCmd - pEntry->iIdCmdFirst);
    return pEntry->pCM->InvokeCommand((LPCMINVOKECOMMANDINFO)lpcmi);
}
 
DWORD
CDefaultContextMenu::BrowserFlagsFromVerb(LPCMINVOKECOMMANDINFOEX lpcmi, PStaticShellEntry pEntry)
{
    CComPtr<IShellBrowser> psb;
    HWND hwndTree;
    LPCWSTR FlagsName;
    WCHAR wszKey[sizeof("shell\\") + MAX_VERB];
    HRESULT hr;
 
    if (!m_site)
        return 0;
 
    /* Get a pointer to the shell browser */
    hr = IUnknown_QueryService(m_site, SID_IShellBrowser, IID_PPV_ARG(IShellBrowser, &psb));
    if (FAILED(hr))
        return 0;
 
    /* See if we are in Explore or Browse mode. If the browser's tree is present, we are in Explore mode.*/
    if (SUCCEEDED(psb->GetControlWindow(FCW_TREE, &hwndTree)) && hwndTree)
        FlagsName = L"ExplorerFlags";
    else
        FlagsName = L"BrowserFlags";
 
    CComPtr<ICommDlgBrowser> pcdb;
    if (SUCCEEDED(psb->QueryInterface(IID_PPV_ARG(ICommDlgBrowser, &pcdb))))
    {
        if (LOBYTE(GetVersion()) < 6 || FlagsName[0] == 'E')
            return 0; // Don't browse in-place
    }
 
    /* Try to get the flag from the verb */
    hr = StringCbPrintfW(wszKey, sizeof(wszKey), L"shell\\%s", pEntry->Verb.GetString());
    if (FAILED_UNEXPECTEDLY(hr))
        return 0;
    return RegGetDword(pEntry->hkClass, wszKey, FlagsName, 0);
}
 
HRESULT
CDefaultContextMenu::TryToBrowse(
    LPCMINVOKECOMMANDINFOEX lpcmi, LPCITEMIDLIST pidlChild, DWORD wFlags)
{
    CComPtr<IShellBrowser> psb;
    HRESULT hr;
 
    if (!m_site)
        return E_FAIL;
 
    /* Get a pointer to the shell browser */
    hr = IUnknown_QueryService(m_site, SID_IShellBrowser, IID_PPV_ARG(IShellBrowser, &psb));
    if (FAILED(hr))
        return hr;
 
    PIDLIST_ABSOLUTE pidl;
    hr = SHILCombine(m_pidlFolder, pidlChild, &pidl);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    hr = psb->BrowseObject(pidl, wFlags & ~SBSP_RELATIVE);
    ILFree(pidl);
    return hr;
}
 
HRESULT
CDefaultContextMenu::InvokePidl(LPCMINVOKECOMMANDINFOEX lpcmi, LPCITEMIDLIST pidl, PStaticShellEntry pEntry)
{
    const BOOL unicode = IsUnicode(*lpcmi);
 
    LPITEMIDLIST pidlFull = ILCombine(m_pidlFolder, pidl);
    if (pidlFull == NULL)
    {
        return E_FAIL;
    }
 
    WCHAR wszPath[MAX_PATH];
    BOOL bHasPath = SHGetPathFromIDListW(pidlFull, wszPath);
 
    WCHAR wszDir[MAX_PATH];
 
    SHELLEXECUTEINFOW sei = { sizeof(sei) };
    sei.fMask = SEE_MASK_CLASSKEY | SEE_MASK_IDLIST | (CmicFlagsToSeeFlags(lpcmi->fMask) & ~SEE_MASK_INVOKEIDLIST);
    sei.hwnd = lpcmi->hwnd;
    sei.nShow = lpcmi->nShow;
    sei.lpVerb = pEntry->Verb;
    sei.lpIDList = pidlFull;
    sei.hkeyClass = pEntry->hkClass;
    sei.dwHotKey = lpcmi->dwHotKey;
    sei.hIcon = lpcmi->hIcon;
    sei.lpDirectory = wszDir;
 
    if (unicode && !StrIsNullOrEmpty(lpcmi->lpDirectoryW))
    {
        sei.lpDirectory = lpcmi->lpDirectoryW;
    }
    else if (bHasPath)
    {
        wcscpy(wszDir, wszPath);
        PathRemoveFileSpec(wszDir);
    }
    else
    {
        if (!SHGetPathFromIDListW(m_pidlFolder, wszDir))
            *wszDir = UNICODE_NULL;
    }
 
    if (bHasPath)
        sei.lpFile = wszPath;
 
    CComHeapPtr<WCHAR> pszParamsW;
    if (unicode && !StrIsNullOrEmpty(lpcmi->lpParametersW))
        sei.lpParameters = lpcmi->lpParametersW;
    else if (!StrIsNullOrEmpty(lpcmi->lpParameters) && __SHCloneStrAtoW(&pszParamsW, lpcmi->lpParameters))
        sei.lpParameters = pszParamsW;
 
    if (!sei.lpClass && (lpcmi->fMask & (CMIC_MASK_HASLINKNAME | CMIC_MASK_HASTITLE)) && unicode)
        sei.lpClass = lpcmi->lpTitleW; // Forward .lnk path from CShellLink::DoOpen (for consrv STARTF_TITLEISLINKNAME)
 
    HRESULT hr = ShellExecuteExW(&sei) ? S_OK : HResultFromWin32(GetLastError());
    ILFree(pidlFull);
    return hr;
}
 
HRESULT
CDefaultContextMenu::InvokeRegVerb(
    LPCMINVOKECOMMANDINFOEX lpcmi)
{
    INT iCmd = LOWORD(lpcmi->lpVerb);
    HRESULT hr;
    UINT i;
 
    POSITION it = m_StaticEntries.FindIndex(iCmd);
 
    if (it == NULL)
        return HResultFromWin32(ERROR_NO_ASSOCIATION);
 
    PStaticShellEntry pEntry = &m_StaticEntries.GetAt(it);
 
    CRegKey VerbKey;
    WCHAR VerbKeyPath[sizeof("shell\\") + MAX_VERB];
    hr = StringCbPrintfW(VerbKeyPath, sizeof(VerbKeyPath), L"shell\\%s", pEntry->Verb.GetString());
    if (SUCCEEDED(hr) && m_pDataObj &&
        VerbKey.Open(pEntry->hkClass, VerbKeyPath, KEY_READ) == ERROR_SUCCESS)
    {
        CLSID clsid;
 
        DWORD KeyState = 0;
        if (lpcmi->fMask & CMIC_MASK_SHIFT_DOWN)
            KeyState |= MK_SHIFT;
        if (lpcmi->fMask & CMIC_MASK_CONTROL_DOWN)
            KeyState |= MK_CONTROL;
 
        POINTL *pPtl = NULL;
        C_ASSERT(sizeof(POINT) == sizeof(POINTL));
        if (lpcmi->fMask & CMIC_MASK_PTINVOKE)
            pPtl = (POINTL*)&lpcmi->ptInvoke;
 
        CComPtr<IExecuteCommand> pEC;
        hr = SHELL_GetRegCLSID(VerbKey, L"command", L"DelegateExecute", clsid);
        if (SUCCEEDED(hr))
            hr = CoCreateInstance(clsid, NULL, CLSCTX_ALL, IID_PPV_ARG(IExecuteCommand, &pEC));
        if (SUCCEEDED(hr))
        {
            CComPtr<IPropertyBag> pPB;
            SHCreatePropertyBagOnRegKey(VerbKey, NULL, STGM_READ, IID_PPV_ARG(IPropertyBag, &pPB));
            return InvokeIExecuteCommandWithDataObject(pEC, pEntry->Verb.GetString(), pPB, m_pDataObj,
                                                       lpcmi, static_cast<IContextMenu*>(this));
        }
 
        CComPtr<IDropTarget> pDT;
        hr = SHELL_GetRegCLSID(VerbKey, L"DropTarget", L"CLSID", clsid);
        if (SUCCEEDED(hr))
            hr = CoCreateInstance(clsid, NULL, CLSCTX_ALL, IID_PPV_ARG(IDropTarget, &pDT));
        if (SUCCEEDED(hr))
        {
            CScopedSetObjectWithSite site(pDT, static_cast<IContextMenu*>(this));
            CComPtr<IPropertyBag> pPB;
            SHCreatePropertyBagOnRegKey(VerbKey, NULL, STGM_READ, IID_PPV_ARG(IPropertyBag, &pPB));
            IUnknown_InitializeCommand(pDT, pEntry->Verb.GetString(), pPB);
            hr = SHSimulateDrop(pDT, m_pDataObj, KeyState, pPtl, NULL);
            return hr;
        }
    }
 
    /* Get the browse flags to see if we need to browse */
    DWORD wFlags = BrowserFlagsFromVerb(lpcmi, pEntry);
 
    for (i=0; i < m_cidl; i++)
    {
        /* Check if we need to browse */
        if (wFlags)
        {
            hr = TryToBrowse(lpcmi, m_apidl[i], wFlags);
            if (SUCCEEDED(hr))
            {
                /* In WinXP if we have browsed, we don't open any more folders.
                 * In Win7 we browse to the first folder we find and
                 * open new windows for each of the rest of the folders */
                UINT ntver = RosGetProcessEffectiveVersion();
                if (ntver >= _WIN32_WINNT_VISTA)
                    wFlags = 0; // FIXME: = SBSP_NEWBROWSER | (wFlags & ~SBSP_SAMEBROWSER);
                else
                    i = m_cidl;
 
                continue;
            }
        }
 
        InvokePidl(lpcmi, m_apidl[i], pEntry);
    }
 
    return S_OK;
}
 
HRESULT
CDefaultContextMenu::_DoInvokeCommandCallback(
    LPCMINVOKECOMMANDINFOEX lpcmi, WPARAM CmdId)
{
    BOOL Unicode = IsUnicode(*lpcmi);
    WCHAR lParamBuf[MAX_PATH];
    LPARAM lParam = 0;
 
    if (Unicode && lpcmi->lpParametersW)
        lParam = (LPARAM)lpcmi->lpParametersW;
    else if (lpcmi->lpParameters)
        lParam = SHAnsiToUnicode(lpcmi->lpParameters, lParamBuf, _countof(lParamBuf)) ? (LPARAM)lParamBuf : 0;
 
    HRESULT hr;
#if 0 // TODO: Try DFM_INVOKECOMMANDEX first.
    DFMICS dfmics = { sizeof(DFMICS), lpcmi->fMask, lParam, m_iIdSCMFirst?, m_iIdDfltLast?, (LPCMINVOKECOMMANDINFO)lpcmi, m_site };
    hr = _DoCallback(DFM_INVOKECOMMANDEX, CmdId, &dfmics);
    if (hr == E_NOTIMPL)
#endif
        hr = _DoCallback(DFM_INVOKECOMMAND, CmdId, (void*)lParam);
    return hr;
}
 
HRESULT
WINAPI
CDefaultContextMenu::InvokeCommand(
    LPCMINVOKECOMMANDINFO lpcmi)
{
    CMINVOKECOMMANDINFOEX LocalInvokeInfo = {};
    HRESULT Result;
    UINT CmdId;
 
    /* Take a local copy of the fixed members of the
       struct as we might need to modify the verb */
    memcpy(&LocalInvokeInfo, lpcmi, min(sizeof(LocalInvokeInfo), lpcmi->cbSize));
 
    /* Check if this is a string verb */
    if (!IS_INTRESOURCE(LocalInvokeInfo.lpVerb))
    {
        /* Get the ID which corresponds to this verb, and update our local copy */
        if (MapVerbToCmdId((LPVOID)LocalInvokeInfo.lpVerb, &CmdId, FALSE))
            LocalInvokeInfo.lpVerb = MAKEINTRESOURCEA(CmdId);
        else
            return GetNoAssocError();
    }
    CmdId = LOWORD(LocalInvokeInfo.lpVerb);
 
    if (!m_DynamicEntries.IsEmpty() && CmdId >= m_iIdSHEFirst && CmdId < m_iIdSHELast)
    {
        LocalInvokeInfo.lpVerb -= m_iIdSHEFirst;
        Result = InvokeShellExt(&LocalInvokeInfo);
        return Result;
    }
 
    if (!m_StaticEntries.IsEmpty() && CmdId >= m_iIdSCMFirst && CmdId < m_iIdSCMLast)
    {
        LocalInvokeInfo.lpVerb -= m_iIdSCMFirst;
        Result = InvokeRegVerb(&LocalInvokeInfo);
        // TODO: if (FAILED(Result) && !(lpcmi->fMask & CMIC_MASK_FLAG_NO_UI)) SHELL_ErrorBox(m_pSite, Result);
        return Result;
    }
 
    if (m_iIdCBFirst != m_iIdCBLast && CmdId >= m_iIdCBFirst && CmdId < m_iIdCBLast)
    {
        Result = _DoInvokeCommandCallback(&LocalInvokeInfo, CmdId - m_iIdCBFirst);
        return Result;
    }
 
    if (m_iIdDfltFirst != m_iIdDfltLast && CmdId >= m_iIdDfltFirst && CmdId < m_iIdDfltLast)
    {
        CmdId -= m_iIdDfltFirst;
        /* See the definitions of IDM_CUT and co to see how this works */
        CmdId += DCM_FCIDM_SHVIEW_OFFSET;
    }
 
    if (LocalInvokeInfo.cbSize >= sizeof(CMINVOKECOMMANDINFOEX) && (LocalInvokeInfo.fMask & CMIC_MASK_PTINVOKE))
    {
        if (m_pDataObj && FAILED_UNEXPECTEDLY(DataObject_SetOffset(m_pDataObj, &LocalInvokeInfo.ptInvoke)))
        {
            ERR("Unable to add OFFSET to DataObject!\n");
        }
    }
 
    /* Check if this is a Id */
    switch (CmdId)
    {
    case FCIDM_SHVIEW_INSERT:
        Result = DoPaste(&LocalInvokeInfo, FALSE);
        break;
    case FCIDM_SHVIEW_INSERTLINK:
        Result = DoPaste(&LocalInvokeInfo, TRUE);
        break;
    case FCIDM_SHVIEW_COPY:
    case FCIDM_SHVIEW_CUT:
        Result = DoCopyOrCut(&LocalInvokeInfo, CmdId == FCIDM_SHVIEW_COPY);
        break;
    case FCIDM_SHVIEW_CREATELINK:
        Result = DoCreateLink(&LocalInvokeInfo);
        break;
    case FCIDM_SHVIEW_DELETE:
        Result = DoDelete(&LocalInvokeInfo);
        break;
    case FCIDM_SHVIEW_RENAME:
        Result = DoRename(&LocalInvokeInfo);
        break;
    case FCIDM_SHVIEW_PROPERTIES:
        Result = DoProperties(&LocalInvokeInfo);
        break;
    case FCIDM_SHVIEW_NEWFOLDER:
        Result = DoCreateNewFolder(&LocalInvokeInfo);
        break;
    case FCIDM_SHVIEW_UNDO:
        Result = DoUndo(&LocalInvokeInfo);
        break;
    default:
        Result = E_INVALIDARG;
        ERR("Unhandled Verb %xl\n", LOWORD(LocalInvokeInfo.lpVerb));
        break;
    }
 
    return Result;
}
 
HRESULT
WINAPI
CDefaultContextMenu::GetCommandString(
    UINT_PTR idCommand,
    UINT uFlags,
    UINT* lpReserved,
    LPSTR lpszName,
    UINT uMaxNameLen)
{
    /* We don't handle the help text yet */
    if (uFlags == GCS_HELPTEXTA ||
        uFlags == GCS_HELPTEXTW ||
        HIWORD(idCommand) != 0)
    {
        return E_NOTIMPL;
    }
 
    UINT CmdId = LOWORD(idCommand);
 
    if (uFlags == GCS_VERBA || uFlags == GCS_VERBW)
    {
        UINT uMsg = (uFlags == GCS_VERBA) ? DFM_GETVERBA : DFM_GETVERBW;
        WPARAM wParam = MAKEWPARAM(idCommand, uMaxNameLen);
        HRESULT hr = _DoCallback(uMsg, wParam, lpszName);
        if (hr == S_OK)
            return S_OK;
    }
 
    if (!m_DynamicEntries.IsEmpty() && CmdId >= m_iIdSHEFirst && CmdId < m_iIdSHELast)
    {
        idCommand -= m_iIdSHEFirst;
        PDynamicShellEntry pEntry = GetDynamicEntry(idCommand);
        if (!pEntry)
            return E_FAIL;
 
        idCommand -= pEntry->iIdCmdFirst;
        return pEntry->pCM->GetCommandString(idCommand,
                                             uFlags,
                                             lpReserved,
                                             lpszName,
                                             uMaxNameLen);
    }
 
    if (!m_StaticEntries.IsEmpty() && CmdId >= m_iIdSCMFirst && CmdId < m_iIdSCMLast)
    {
        /* Validation just returns S_OK on a match. The id exists. */
        if (uFlags == GCS_VALIDATEA || uFlags == GCS_VALIDATEW)
            return S_OK;
 
        CmdId -= m_iIdSCMFirst;
 
        POSITION it = m_StaticEntries.FindIndex(CmdId);
 
        if (it == NULL)
            return E_INVALIDARG;
 
        PStaticShellEntry pEntry = &m_StaticEntries.GetAt(it);
 
        if (uFlags == GCS_VERBW)
            return StringCchCopyW((LPWSTR)lpszName, uMaxNameLen, pEntry->Verb);
 
        if (uFlags == GCS_VERBA)
        {
            if (SHUnicodeToAnsi(pEntry->Verb, lpszName, uMaxNameLen))
                return S_OK;
        }
 
        return E_INVALIDARG;
    }
 
    //FIXME: Should we handle callbacks here?
    if (m_iIdDfltFirst != m_iIdDfltLast && CmdId >= m_iIdDfltFirst && CmdId < m_iIdDfltLast)
    {
        CmdId -= m_iIdDfltFirst;
        /* See the definitions of IDM_CUT and co to see how this works */
        CmdId += DCM_FCIDM_SHVIEW_OFFSET;
    }
 
    /* Loop looking for a matching Id */
    for (UINT i = 0; i < _countof(g_StaticInvokeCmdMap); i++)
    {
        if (g_StaticInvokeCmdMap[i].IntVerb == CmdId)
        {
            /* Validation just returns S_OK on a match */
            if (uFlags == GCS_VALIDATEA || uFlags == GCS_VALIDATEW)
                return S_OK;
 
            /* Return a copy of the ANSI verb */
            if (uFlags == GCS_VERBA)
                return StringCchCopyA(lpszName, uMaxNameLen, g_StaticInvokeCmdMap[i].szStringVerb);
 
            /* Convert the ANSI verb to unicode and return that */
            if (uFlags == GCS_VERBW)
            {
                if (SHAnsiToUnicode(g_StaticInvokeCmdMap[i].szStringVerb, (LPWSTR)lpszName, uMaxNameLen))
                    return S_OK;
            }
        }
    }
 
    return E_INVALIDARG;
}
 
HRESULT
WINAPI
CDefaultContextMenu::HandleMenuMsg(
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam)
{
    return HandleMenuMsg2(uMsg, wParam, lParam, NULL);
}
 
HRESULT SHGetMenuIdFromMenuMsg(UINT uMsg, LPARAM lParam, UINT *CmdId)
{
    if (uMsg == WM_DRAWITEM)
    {
        DRAWITEMSTRUCT* pDrawStruct = reinterpret_cast<DRAWITEMSTRUCT*>(lParam);
        *CmdId = pDrawStruct->itemID;
        return S_OK;
    }
    else if (uMsg == WM_MEASUREITEM)
    {
        MEASUREITEMSTRUCT* pMeasureStruct = reinterpret_cast<MEASUREITEMSTRUCT*>(lParam);
        *CmdId = pMeasureStruct->itemID;
        return S_OK;
    }
    return E_FAIL;
}
 
HRESULT
WINAPI
CDefaultContextMenu::HandleMenuMsg2(
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam,
    LRESULT *plResult)
{
    if (!SHELL_IsContextMenuMsg(uMsg))
        return E_FAIL;
 
    UINT CmdId;
    if (uMsg == WM_INITMENUPOPUP)
    {
        CmdId = GetMenuItemID((HMENU)wParam, 0);
        if (CmdId == ~0ul)
            return E_FAIL;
    }
    else
    {
        HRESULT hr = SHGetMenuIdFromMenuMsg(uMsg, lParam, &CmdId);
        if (FAILED(hr))
            return S_FALSE;
    }
    CmdId -= m_iIdQCMFirst; // Convert from Win32 id to our base
 
    if (CmdId >= m_iIdSHEFirst && CmdId < m_iIdSHELast)
    {
        if (PDynamicShellEntry pEntry = GetDynamicEntry(CmdId - m_iIdSHEFirst))
            return SHForwardContextMenuMsg(pEntry->pCM, uMsg, wParam, lParam, plResult, TRUE);
    }
    // TODO: _DoCallback(DFM_WM_*, ...)
    return E_FAIL;
}
 
HRESULT
WINAPI
CDefaultContextMenu::SetSite(IUnknown *pUnkSite)
{
    m_site = pUnkSite;
    return S_OK;
}
 
HRESULT
WINAPI
CDefaultContextMenu::GetSite(REFIID riid, void **ppvSite)
{
    if (!m_site)
        return E_FAIL;
 
    return m_site->QueryInterface(riid, ppvSite);
}
 
static
HRESULT
CDefaultContextMenu_CreateInstance(const DEFCONTEXTMENU *pdcm, LPFNDFMCALLBACK lpfn, REFIID riid, void **ppv)
{
    return ShellObjectCreatorInit<CDefaultContextMenu>(pdcm, lpfn, riid, ppv);
}
 
/*************************************************************************
 * SHCreateDefaultContextMenu            [SHELL32.325] Vista API
 *
 */
 
HRESULT
WINAPI
SHCreateDefaultContextMenu(const DEFCONTEXTMENU *pdcm, REFIID riid, void **ppv)
{
    HRESULT hr;
 
    if (!ppv)
        return E_INVALIDARG;
 
    hr = CDefaultContextMenu_CreateInstance(pdcm, NULL, riid, ppv);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    return S_OK;
}
 
/*************************************************************************
 * CDefFolderMenu_Create2            [SHELL32.701]
 *
 */
 
HRESULT
WINAPI
CDefFolderMenu_Create2(
    PCIDLIST_ABSOLUTE pidlFolder,
    HWND hwnd,
    UINT cidl,
    PCUITEMID_CHILD_ARRAY apidl,
    IShellFolder *psf,
    LPFNDFMCALLBACK lpfn,
    UINT nKeys,
    const HKEY *ahkeyClsKeys,
    IContextMenu **ppcm)
{
    DEFCONTEXTMENU dcm;
    dcm.hwnd = hwnd;
    dcm.pcmcb = NULL;
    dcm.pidlFolder = pidlFolder;
    dcm.psf = psf;
    dcm.cidl = cidl;
    dcm.apidl = apidl;
    dcm.punkAssociationInfo = NULL;
    dcm.cKeys = nKeys;
    dcm.aKeys = ahkeyClsKeys;
 
    HRESULT hr = CDefaultContextMenu_CreateInstance(&dcm, lpfn, IID_PPV_ARG(IContextMenu, ppcm));
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    return S_OK;
}