CFSDropTarget.cpp

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/*
 * file system folder drop target
 *
 * Copyright 1997             Marcus Meissner
 * Copyright 1998, 1999, 2002 Juergen Schmied
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
#include <precomp.h>
 
WINE_DEFAULT_DEBUG_CHANNEL (shell);
 
#define D_NONE DROPEFFECT_NONE
#define D_COPY DROPEFFECT_COPY
#define D_MOVE DROPEFFECT_MOVE
#define D_LINK DROPEFFECT_LINK
 
static void SHELL_StripIllegalFsNameCharacters(_Inout_ LPWSTR Buf)
{
    for (LPWSTR src = Buf, dst = src;;)
    {
        *dst = *src;
        if (!*dst)
            break;
        else if (wcschr(INVALID_FILETITLE_CHARACTERSW, *dst))
            src = CharNextW(src);
        else
            ++src, ++dst;
    }
}
 
static bool PathIsSameDrive(LPCWSTR Path1, LPCWSTR Path2)
{
    int d1 = PathGetDriveNumberW(Path1), d2 = PathGetDriveNumberW(Path2);
    return d1 == d2 && d2 >= 0;
}
 
static bool PathIsDriveRoot(LPCWSTR Path)
{
    return PathIsRootW(Path) && PathGetDriveNumberW(Path) >= 0;
}
 
static HRESULT
SHELL_LimitDropEffectToItemAttributes(_In_ IDataObject *pDataObject, _Inout_ PDWORD pdwEffect)
{
    DWORD att = *pdwEffect & (SFGAO_CANCOPY | SFGAO_CANMOVE | SFGAO_CANLINK); // DROPEFFECT maps perfectly to these SFGAO bits
    HRESULT hr = SHGetAttributesFromDataObject(pDataObject, att, &att, NULL);
    if (FAILED(hr))
        return S_FALSE;
    *pdwEffect &= ~(SFGAO_CANCOPY | SFGAO_CANMOVE | SFGAO_CANLINK) | att;
    return hr;
}
 
static void GetDefaultCopyMoveEffect()
{
    // FIXME: When the source is on a different volume than the target, change default from move to copy
}
 
/****************************************************************************
 * CFSDropTarget::_CopyItems
 *
 * copies or moves items to this folder
 */
HRESULT CFSDropTarget::_CopyItems(IShellFolder * pSFFrom, UINT cidl,
                                  LPCITEMIDLIST * apidl, BOOL bCopy)
{
    HRESULT ret;
    WCHAR wszDstPath[MAX_PATH + 1] = {0};
    PWCHAR pwszSrcPathsList = (PWCHAR) HeapAlloc(GetProcessHeap(), 0, MAX_PATH * sizeof(WCHAR) * cidl + 1);
    if (!pwszSrcPathsList)
        return E_OUTOFMEMORY;
 
    PWCHAR pwszListPos = pwszSrcPathsList;
    STRRET strretFrom;
    SHFILEOPSTRUCTW fop;
    BOOL bRenameOnCollision = FALSE;
 
    /* Build a double null terminated list of C strings from source paths */
    for (UINT i = 0; i < cidl; i++)
    {
        ret = pSFFrom->GetDisplayNameOf(apidl[i], SHGDN_FORPARSING, &strretFrom);
        if (FAILED(ret))
            goto cleanup;
 
        ret = StrRetToBufW(&strretFrom, NULL, pwszListPos, MAX_PATH);
        if (FAILED(ret))
            goto cleanup;
 
        pwszListPos += lstrlenW(pwszListPos) + 1;
    }
    /* Append the final null. */
    *pwszListPos = L'\0';
 
    /* Build a double null terminated target (this path) */
    ret = StringCchCopyW(wszDstPath, MAX_PATH, m_sPathTarget);
    if (FAILED(ret))
        goto cleanup;
 
    wszDstPath[lstrlenW(wszDstPath) + 1] = UNICODE_NULL;
 
    /* Set bRenameOnCollision to TRUE if necesssary */
    if (bCopy)
    {
        WCHAR szPath1[MAX_PATH], szPath2[MAX_PATH];
        GetFullPathNameW(pwszSrcPathsList, _countof(szPath1), szPath1, NULL);
        GetFullPathNameW(wszDstPath, _countof(szPath2), szPath2, NULL);
        PathRemoveFileSpecW(szPath1);
        if (_wcsicmp(szPath1, szPath2) == 0)
            bRenameOnCollision = TRUE;
    }
 
    ZeroMemory(&fop, sizeof(fop));
    fop.hwnd = m_hwndSite;
    fop.wFunc = bCopy ? FO_COPY : FO_MOVE;
    fop.pFrom = pwszSrcPathsList;
    fop.pTo = wszDstPath;
    fop.fFlags = FOF_ALLOWUNDO | FOF_NOCONFIRMMKDIR;
    if (bRenameOnCollision)
        fop.fFlags |= FOF_RENAMEONCOLLISION;
 
    ret = S_OK;
 
    if (SHFileOperationW(&fop))
    {
        ERR("SHFileOperationW failed\n");
        ret = E_FAIL;
    }
 
cleanup:
    HeapFree(GetProcessHeap(), 0, pwszSrcPathsList);
    return ret;
}
 
CFSDropTarget::CFSDropTarget():
    m_cfShellIDList(0),
    m_fAcceptFmt(FALSE),
    m_sPathTarget(NULL),
    m_hwndSite(NULL),
    m_grfKeyState(0),
    m_AllowedEffects(0)
{
}
 
HRESULT CFSDropTarget::Initialize(LPWSTR PathTarget)
{
    if (!PathTarget)
        return E_UNEXPECTED;
 
    m_cfShellIDList = RegisterClipboardFormatW(CFSTR_SHELLIDLIST);
    if (!m_cfShellIDList)
        return E_FAIL;
 
    return SHStrDupW(PathTarget, &m_sPathTarget);
}
 
CFSDropTarget::~CFSDropTarget()
{
    SHFree(m_sPathTarget);
}
 
BOOL
CFSDropTarget::_GetUniqueFileName(LPCWSTR pwszBasePath, LPCWSTR pwszExt, LPWSTR pwszTarget, BOOL bShortcut)
{
    WCHAR wszLink[40];
 
    if (!bShortcut)
    {
        if (!LoadStringW(shell32_hInstance, IDS_LNK_FILE, wszLink, _countof(wszLink)))
            wszLink[0] = L'\0';
    }
 
    if (!bShortcut)
        swprintf(pwszTarget, L"%s%s%s", wszLink, pwszBasePath, pwszExt);
    else
        swprintf(pwszTarget, L"%s%s", pwszBasePath, pwszExt);
 
    for (UINT i = 2; PathFileExistsW(pwszTarget); ++i)
    {
        if (!bShortcut)
            swprintf(pwszTarget, L"%s%s (%u)%s", wszLink, pwszBasePath, i, pwszExt);
        else
            swprintf(pwszTarget, L"%s (%u)%s", pwszBasePath, i, pwszExt);
    }
 
    return TRUE;
}
 
/****************************************************************************
 * IDropTarget implementation
 */
BOOL CFSDropTarget::_QueryDrop(DWORD dwKeyState, LPDWORD pdwEffect)
{
    /* TODO Windows does different drop effects if dragging across drives.
    i.e., it will copy instead of move if the directories are on different disks. */
    GetDefaultCopyMoveEffect();
 
    DWORD dwEffect = m_dwDefaultEffect;
 
    *pdwEffect = DROPEFFECT_NONE;
 
    if (m_fAcceptFmt) { /* Does our interpretation of the keystate ... */
        *pdwEffect = KeyStateToDropEffect(dwKeyState);
 
        // Transform disallowed move to a copy
        if ((*pdwEffect & D_MOVE) && (m_AllowedEffects & (D_MOVE | D_COPY)) == D_COPY)
            *pdwEffect = D_COPY;
 
        *pdwEffect &= m_AllowedEffects;
 
        if (*pdwEffect == DROPEFFECT_NONE)
            *pdwEffect = dwEffect;
 
        /* ... matches the desired effect ? */
        if (dwEffect & *pdwEffect) {
            return TRUE;
        }
    }
    return FALSE;
}
 
HRESULT CFSDropTarget::_GetEffectFromMenu(IDataObject *pDataObject, POINTL pt, DWORD *pdwEffect, DWORD dwAvailableEffects)
{
    HMENU hmenu = LoadMenuW(shell32_hInstance, MAKEINTRESOURCEW(IDM_DRAGFILE));
    if (!hmenu)
        return E_OUTOFMEMORY;
    HMENU hpopupmenu = GetSubMenu(hmenu, 0);
 
    SHELL_LimitDropEffectToItemAttributes(pDataObject, &dwAvailableEffects);
    if ((dwAvailableEffects & DROPEFFECT_COPY) == 0)
        DeleteMenu(hpopupmenu, IDM_COPYHERE, MF_BYCOMMAND);
    if ((dwAvailableEffects & DROPEFFECT_MOVE) == 0)
        DeleteMenu(hpopupmenu, IDM_MOVEHERE, MF_BYCOMMAND);
    if ((dwAvailableEffects & DROPEFFECT_LINK) == 0 && (dwAvailableEffects & (DROPEFFECT_COPY | DROPEFFECT_MOVE)))
        DeleteMenu(hpopupmenu, IDM_LINKHERE, MF_BYCOMMAND);
 
    GetDefaultCopyMoveEffect();
    if (*pdwEffect & dwAvailableEffects & DROPEFFECT_COPY)
        SetMenuDefaultItem(hpopupmenu, IDM_COPYHERE, FALSE);
    else if (*pdwEffect & dwAvailableEffects & DROPEFFECT_MOVE)
        SetMenuDefaultItem(hpopupmenu, IDM_MOVEHERE, FALSE);
    else if (dwAvailableEffects & DROPEFFECT_LINK)
        SetMenuDefaultItem(hpopupmenu, IDM_LINKHERE, FALSE);
 
    CRegKeyHandleArray keys;
    HDCIA hDCIA = DCIA_Create();
    HDCMA hDCMA = DCMA_Create();
    CComHeapPtr<ITEMIDLIST_ABSOLUTE> pidlFolder(SHELL32_CreateSimpleIDListFromPath(m_sPathTarget, FILE_ATTRIBUTE_DIRECTORY));
    if (hDCMA && hDCIA && pidlFolder)
    {
        AddPidlClassKeysToArray(pidlFolder, keys, keys);
        for (UINT i = 0; i < keys; ++i)
            DCIA_AddShellExSubkey(hDCIA, keys[i], L"DragDropHandlers");
 
        QCMINFO qcmi = { hpopupmenu, 0, DROPIDM_EXTFIRST, DROPIDM_EXTLAST };
        DCMA_InsertMenuItems(hDCMA, hDCIA, pidlFolder, pDataObject, keys, keys, &qcmi, 0, m_site);
    }
 
    /* We shouldn't use the site window here because the menu should work even when we don't have a site */
    HWND hwndDummy = CreateWindowEx(0,
                              WC_STATIC,
                              NULL,
                              WS_OVERLAPPED | WS_DISABLED | WS_CLIPSIBLINGS | WS_BORDER | SS_LEFT,
                              pt.x,
                              pt.y,
                              1,
                              1,
                              NULL,
                              NULL,
                              NULL,
                              NULL);
 
    SetForegroundWindow(hwndDummy); // Required for aborting by pressing Esc when dragging from Explorer to desktop
    UINT uCommand = TrackPopupMenu(hpopupmenu,
                                   TPM_LEFTALIGN | TPM_RETURNCMD | TPM_LEFTBUTTON | TPM_RIGHTBUTTON | TPM_NONOTIFY,
                                   pt.x, pt.y, 0, hwndDummy, NULL);
 
    DestroyWindow(hwndDummy);
 
    HRESULT hr = S_FALSE; // S_FALSE means we did not handle the command
    C_ASSERT(IDM_COPYHERE < DROPIDM_EXTFIRST && IDM_MOVEHERE < DROPIDM_EXTFIRST &&
             IDM_LINKHERE < DROPIDM_EXTFIRST && DROPIDM_EXTFIRST > 0);
    if (uCommand >= DROPIDM_EXTFIRST && uCommand <= DROPIDM_EXTLAST)
    {
        CMINVOKECOMMANDINFO ici = { sizeof(ici), 0, m_hwndSite, MAKEINTRESOURCEA(uCommand - DROPIDM_EXTFIRST) };
        ici.nShow = SW_SHOW;
        if (m_grfKeyState & MK_SHIFT)
            ici.fMask |= CMIC_MASK_SHIFT_DOWN;
        if (m_grfKeyState & MK_CONTROL)
            ici.fMask |= CMIC_MASK_CONTROL_DOWN;
        DCMA_InvokeCommand(hDCMA, &ici);
        hr = S_OK;
        *pdwEffect = DROPEFFECT_NONE;
    }
    else if (uCommand == 0)
    {
        hr = S_OK;
        *pdwEffect = DROPEFFECT_NONE;
    }
    else if (uCommand == IDM_COPYHERE)
        *pdwEffect = DROPEFFECT_COPY;
    else if (uCommand == IDM_MOVEHERE)
        *pdwEffect = DROPEFFECT_MOVE;
    else if (uCommand == IDM_LINKHERE)
        *pdwEffect = DROPEFFECT_LINK;
    else
        hr = E_UNEXPECTED;
 
    DCMA_Destroy(hDCMA);
    DCIA_Destroy(hDCIA);
    DestroyMenu(hmenu);
    return hr;
}
 
HRESULT CFSDropTarget::_RepositionItems(IShellFolderView *psfv, IDataObject *pdtobj, POINTL pt)
{
    CComPtr<IFolderView> pfv;
    POINT ptDrag;
    HRESULT hr = psfv->QueryInterface(IID_PPV_ARG(IFolderView, &pfv));
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    hr = psfv->GetDragPoint(&ptDrag);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    PIDLIST_ABSOLUTE pidlFolder;
    PUITEMID_CHILD *apidl;
    UINT cidl;
    hr = SH_GetApidlFromDataObject(pdtobj, &pidlFolder, &apidl, &cidl);
    if (FAILED_UNEXPECTEDLY(hr))
        return hr;
 
    CComHeapPtr<POINT> apt;
    if (!apt.Allocate(cidl))
    {
        SHFree(pidlFolder);
        _ILFreeaPidl(apidl, cidl);
        return E_OUTOFMEMORY;
    }
 
    for (UINT i = 0; i<cidl; i++)
    {
        pfv->GetItemPosition(apidl[i], &apt[i]);
        apt[i].x += pt.x - ptDrag.x;
        apt[i].y += pt.y - ptDrag.y;
    }
 
    pfv->SelectAndPositionItems(cidl, apidl, apt, SVSI_SELECT);
 
    SHFree(pidlFolder);
    _ILFreeaPidl(apidl, cidl);
    return S_OK;
}
 
HRESULT WINAPI CFSDropTarget::DragEnter(IDataObject *pDataObject,
                                        DWORD dwKeyState, POINTL pt, DWORD *pdwEffect)
{
    TRACE("(%p)->(DataObject=%p)\n", this, pDataObject);
 
    const BOOL bAnyKeyMod = dwKeyState & (MK_SHIFT | MK_CONTROL);
    m_AllowedEffects = *pdwEffect;
 
    if (*pdwEffect == DROPEFFECT_NONE)
        return S_OK;
 
    FORMATETC fmt;
    FORMATETC fmt2;
    m_fAcceptFmt = FALSE;
 
    InitFormatEtc (fmt, m_cfShellIDList, TYMED_HGLOBAL);
    InitFormatEtc (fmt2, CF_HDROP, TYMED_HGLOBAL);
 
    if (SUCCEEDED(pDataObject->QueryGetData(&fmt)))
        m_fAcceptFmt = TRUE;
    else if (SUCCEEDED(pDataObject->QueryGetData(&fmt2)))
        m_fAcceptFmt = TRUE;
 
    m_grfKeyState = dwKeyState;
 
    SHELL_LimitDropEffectToItemAttributes(pDataObject, pdwEffect);
    m_AllowedEffects = *pdwEffect;
    m_dwDefaultEffect = m_AllowedEffects;
    switch (*pdwEffect & (D_COPY | D_MOVE | D_LINK))
    {
        case D_COPY | D_MOVE:
            if (dwKeyState & MK_CONTROL)
                m_dwDefaultEffect = D_COPY;
            else
                m_dwDefaultEffect = D_MOVE;
            break;
        case D_COPY | D_MOVE | D_LINK:
            if ((dwKeyState & (MK_SHIFT | MK_CONTROL)) == (MK_SHIFT | MK_CONTROL))
                m_dwDefaultEffect = D_LINK;
            else if ((dwKeyState & (MK_SHIFT | MK_CONTROL)) == MK_CONTROL)
                m_dwDefaultEffect = D_COPY;
            else
                m_dwDefaultEffect = D_MOVE;
            break;
        case D_COPY | D_LINK:
            if ((dwKeyState & (MK_SHIFT | MK_CONTROL)) == (MK_SHIFT | MK_CONTROL))
                m_dwDefaultEffect = D_LINK;
            else
                m_dwDefaultEffect = D_COPY;
            break;
        case D_MOVE | D_LINK:
            if ((dwKeyState & (MK_SHIFT | MK_CONTROL)) == (MK_SHIFT | MK_CONTROL))
                m_dwDefaultEffect = D_LINK;
            else
                m_dwDefaultEffect = D_MOVE;
            break;
    }
 
    STGMEDIUM medium;
    if (SUCCEEDED(pDataObject->GetData(&fmt2, &medium)))
    {
        WCHAR wstrFirstFile[MAX_PATH];
        if (DragQueryFileW((HDROP)medium.hGlobal, 0, wstrFirstFile, _countof(wstrFirstFile)))
        {
            if (!PathIsSameDrive(wstrFirstFile, m_sPathTarget) && m_dwDefaultEffect != D_LINK)
            {
                m_dwDefaultEffect = DROPEFFECT_COPY;
            }
 
            if (!bAnyKeyMod && PathIsDriveRoot(wstrFirstFile) && (m_AllowedEffects & DROPEFFECT_LINK))
            {
                m_dwDefaultEffect = DROPEFFECT_LINK; // Don't copy a drive by default
            }
        }
        ReleaseStgMedium(&medium);
    }
 
    if (!m_fAcceptFmt)
        m_AllowedEffects = DROPEFFECT_NONE;
    else
        *pdwEffect = m_dwDefaultEffect;
    *pdwEffect &= m_AllowedEffects;
 
    return S_OK;
}
 
HRESULT WINAPI CFSDropTarget::DragOver(DWORD dwKeyState, POINTL pt,
                                       DWORD *pdwEffect)
{
    TRACE("(%p)\n", this);
 
    if (!pdwEffect)
        return E_INVALIDARG;
 
    m_grfKeyState = dwKeyState;
 
    _QueryDrop(dwKeyState, pdwEffect);
 
    return S_OK;
}
 
HRESULT WINAPI CFSDropTarget::DragLeave()
{
    TRACE("(%p)\n", this);
 
    m_fAcceptFmt = FALSE;
 
    return S_OK;
}
 
HRESULT WINAPI CFSDropTarget::Drop(IDataObject *pDataObject,
                                   DWORD dwKeyState, POINTL pt, DWORD *pdwEffect)
{
    TRACE("(%p) object dropped, effect %u\n", this, *pdwEffect);
 
    if (!pdwEffect)
        return E_INVALIDARG;
 
    IUnknown_GetWindow(m_site, &m_hwndSite);
 
    DWORD dwAvailableEffects = *pdwEffect;
 
    _QueryDrop(dwKeyState, pdwEffect);
 
    TRACE("pdwEffect: 0x%x, m_dwDefaultEffect: 0x%x, dwAvailableEffects: 0x%x\n", *pdwEffect, m_dwDefaultEffect, dwAvailableEffects);
 
    if (m_grfKeyState & MK_RBUTTON)
    {
        HRESULT hr = _GetEffectFromMenu(pDataObject, pt, pdwEffect, dwAvailableEffects);
        if (FAILED_UNEXPECTEDLY(hr) || hr == S_OK)
            return hr;
    }
 
    if (*pdwEffect == DROPEFFECT_MOVE && m_site)
    {
        CComPtr<IShellFolderView> psfv;
        HRESULT hr = IUnknown_QueryService(m_site, SID_SFolderView, IID_PPV_ARG(IShellFolderView, &psfv));
        if (SUCCEEDED(hr) && psfv->IsDropOnSource(this) == S_OK)
        {
            _RepositionItems(psfv, pDataObject, pt);
            return S_OK;
        }
    }
 
    BOOL fIsOpAsync = FALSE;
    CComPtr<IAsyncOperation> pAsyncOperation;
 
    if (SUCCEEDED(pDataObject->QueryInterface(IID_PPV_ARG(IAsyncOperation, &pAsyncOperation))))
    {
        if (SUCCEEDED(pAsyncOperation->GetAsyncMode(&fIsOpAsync)) && fIsOpAsync)
        {
            _DoDropData *data = static_cast<_DoDropData*>(HeapAlloc(GetProcessHeap(), 0, sizeof(_DoDropData)));
            data->This = this;
            // Need to maintain this class in case the window is closed or the class exists temporarily (when dropping onto a folder).
            pDataObject->AddRef();
            pAsyncOperation->StartOperation(NULL);
            CoMarshalInterThreadInterfaceInStream(IID_IDataObject, pDataObject, &data->pStream);
            this->AddRef();
            data->dwKeyState = dwKeyState;
            data->pt = pt;
            // Need to dereference as pdweffect gets freed.
            data->pdwEffect = *pdwEffect;
            SHCreateThread(CFSDropTarget::_DoDropThreadProc, data, CTF_COINIT | CTF_PROCESS_REF, NULL);
            return S_OK;
        }
    }
    return this->_DoDrop(pDataObject, dwKeyState, pt, pdwEffect);
}
 
HRESULT
WINAPI
CFSDropTarget::SetSite(IUnknown *pUnkSite)
{
    m_site = pUnkSite;
    return S_OK;
}
 
HRESULT
WINAPI
CFSDropTarget::GetSite(REFIID riid, void **ppvSite)
{
    if (!m_site)
        return E_FAIL;
 
    return m_site->QueryInterface(riid, ppvSite);
}
 
HRESULT CFSDropTarget::_DoDrop(IDataObject *pDataObject,
                               DWORD dwKeyState, POINTL pt, DWORD *pdwEffect)
{
    TRACE("(%p) performing drop, effect %u\n", this, *pdwEffect);
    FORMATETC fmt;
    FORMATETC fmt2;
    STGMEDIUM medium;
 
    InitFormatEtc (fmt, m_cfShellIDList, TYMED_HGLOBAL);
    InitFormatEtc (fmt2, CF_HDROP, TYMED_HGLOBAL);
 
    HRESULT hr;
    bool bCopy = TRUE;
    bool bLinking = FALSE;
 
    /* Figure out what drop operation we're doing */
    if (pdwEffect)
    {
        TRACE("Current drop effect flag %i\n", *pdwEffect);
        if ((*pdwEffect & DROPEFFECT_MOVE) == DROPEFFECT_MOVE)
            bCopy = FALSE;
        if ((*pdwEffect & DROPEFFECT_LINK) == DROPEFFECT_LINK)
            bLinking = TRUE;
    }
 
    if (SUCCEEDED(hr = pDataObject->QueryGetData(&fmt)))
    {
        hr = pDataObject->GetData(&fmt, &medium);
        TRACE("CFSTR_SHELLIDLIST\n");
        if (FAILED(hr))
        {
            ERR("CFSTR_SHELLIDLIST failed\n");
        }
        /* lock the handle */
        LPIDA lpcida = (LPIDA)GlobalLock(medium.hGlobal);
        if (!lpcida)
        {
            ReleaseStgMedium(&medium);
            return E_FAIL;
        }
 
        /* convert the data into pidl */
        LPITEMIDLIST pidl;
        LPITEMIDLIST *apidl = _ILCopyCidaToaPidl(&pidl, lpcida);
        if (!apidl)
        {
            ReleaseStgMedium(&medium);
            return E_FAIL;
        }
 
        CComPtr<IShellFolder> psfDesktop;
        CComPtr<IShellFolder> psfFrom = NULL;
 
        /* Grab the desktop shell folder */
        hr = SHGetDesktopFolder(&psfDesktop);
        if (FAILED(hr))
        {
            ERR("SHGetDesktopFolder failed\n");
            SHFree(pidl);
            _ILFreeaPidl(apidl, lpcida->cidl);
            ReleaseStgMedium(&medium);
            return E_FAIL;
        }
 
        /* Find source folder, this is where the clipboard data was copied from */
        if (_ILIsDesktop(pidl))
        {
            /* use desktop shell folder */
            psfFrom = psfDesktop;
        }
        else
        {
            hr = psfDesktop->BindToObject(pidl, NULL, IID_PPV_ARG(IShellFolder, &psfFrom));
            if (FAILED(hr))
            {
                ERR("no IShellFolder\n");
                SHFree(pidl);
                _ILFreeaPidl(apidl, lpcida->cidl);
                ReleaseStgMedium(&medium);
                return E_FAIL;
            }
        }
 
        if (bLinking)
        {
            WCHAR wszNewLnk[MAX_PATH];
 
            TRACE("target path = %s\n", debugstr_w(m_sPathTarget));
 
            /* We need to create a link for each pidl in the copied items, so step through the pidls from the clipboard */
            for (UINT i = 0; i < lpcida->cidl; i++)
            {
                SFGAOF att = SHGetAttributes(psfFrom, apidl[i], SFGAO_FOLDER | SFGAO_STREAM | SFGAO_FILESYSTEM);
                CComHeapPtr<ITEMIDLIST_ABSOLUTE> pidlFull;
                hr = SHILCombine(pidl, apidl[i], &pidlFull);
 
                WCHAR targetName[MAX_PATH];
                if (SUCCEEDED(hr))
                {
                    // If the target is a file, we use SHGDN_FORPARSING because "NeverShowExt" will hide the ".lnk" extension.
                    // If the target is a virtual item, we ask for the friendly name because SHGDN_FORPARSING will return a GUID.
                    BOOL UseParsing = (att & (SFGAO_FILESYSTEM | SFGAO_FOLDER)) == SFGAO_FILESYSTEM;
                    DWORD ShgdnFor = UseParsing ? SHGDN_FORPARSING : SHGDN_FOREDITING;
                    hr = DisplayNameOfW(psfFrom, apidl[i], ShgdnFor | SHGDN_INFOLDER, targetName, _countof(targetName));
                }
                if (FAILED_UNEXPECTEDLY(hr))
                {
                    SHELL_ErrorBox(m_hwndSite, hr);
                    break;
                }
                SHELL_StripIllegalFsNameCharacters(targetName);
 
                WCHAR wszCombined[MAX_PATH + _countof(targetName)];
                PathCombineW(wszCombined, m_sPathTarget, targetName);
 
                // Check to see if the source is a link
                BOOL fSourceIsLink = FALSE;
                if (!_wcsicmp(PathFindExtensionW(targetName), L".lnk") && (att & (SFGAO_FOLDER | SFGAO_STREAM)) != SFGAO_FOLDER)
                {
                    fSourceIsLink = TRUE;
                    PathRemoveExtensionW(wszCombined);
                }
 
                // Create a pathname to save the new link.
                _GetUniqueFileName(wszCombined, L".lnk", wszNewLnk, TRUE);
 
                CComPtr<IPersistFile> ppf;
                if (fSourceIsLink)
                {
                    PWSTR pwszTargetFull;
                    hr = SHGetNameFromIDList(pidlFull, SIGDN_DESKTOPABSOLUTEPARSING, &pwszTargetFull);
                    if (!FAILED_UNEXPECTEDLY(hr))
                    {
                        hr = IShellLink_ConstructFromPath(pwszTargetFull, IID_PPV_ARG(IPersistFile, &ppf));
                        FAILED_UNEXPECTEDLY(hr);
                        SHFree(pwszTargetFull);
                    }
                }
                else
                {
                    CComPtr<IShellLinkW> pLink;
                    hr = CShellLink::_CreatorClass::CreateInstance(NULL, IID_PPV_ARG(IShellLinkW, &pLink));
                    if (!FAILED_UNEXPECTEDLY(hr))
                    {
                        hr = pLink->SetIDList(pidlFull);
                        if (!FAILED_UNEXPECTEDLY(hr))
                            hr = pLink->QueryInterface(IID_PPV_ARG(IPersistFile, &ppf));
 
                        PWSTR pwszPath, pSep;
                        if ((att & SFGAO_FILESYSTEM) && SUCCEEDED(SHGetNameFromIDList(pidlFull, SIGDN_FILESYSPATH, &pwszPath)))
                        {
                            if ((pSep = PathFindFileNameW(pwszPath)) > pwszPath)
                            {
                                pSep[-1] = UNICODE_NULL;
                                pLink->SetWorkingDirectory(pwszPath);
                            }
                            SHFree(pwszPath);
                        }
                    }
                }
                if (SUCCEEDED(hr))
                    hr = ppf->Save(wszNewLnk, !fSourceIsLink);
                if (FAILED_UNEXPECTEDLY(hr))
                {
                    SHELL_ErrorBox(m_hwndSite, hr);
                    break;
                }
                SHChangeNotify(SHCNE_CREATE, SHCNF_PATHW, wszNewLnk, NULL);
            }
        }
        else
        {
            hr = _CopyItems(psfFrom, lpcida->cidl, (LPCITEMIDLIST*)apidl, bCopy);
        }
 
        SHFree(pidl);
        _ILFreeaPidl(apidl, lpcida->cidl);
        ReleaseStgMedium(&medium);
    }
    else if (SUCCEEDED(hr = pDataObject->QueryGetData(&fmt2)))
    {
        FORMATETC fmt2;
        InitFormatEtc (fmt2, CF_HDROP, TYMED_HGLOBAL);
        if (SUCCEEDED(hr = pDataObject->GetData(&fmt2, &medium)) /* && SUCCEEDED(pDataObject->GetData(&fmt2, &medium))*/)
        {
            WCHAR wszTargetPath[MAX_PATH + 1];
            LPWSTR pszSrcList;
 
            wcscpy(wszTargetPath, m_sPathTarget);
            //Double NULL terminate.
            wszTargetPath[wcslen(wszTargetPath) + 1] = '\0';
 
            LPDROPFILES lpdf = (LPDROPFILES) GlobalLock(medium.hGlobal);
            if (!lpdf)
            {
                ERR("Error locking global\n");
                return E_FAIL;
            }
            pszSrcList = (LPWSTR) (((byte*) lpdf) + lpdf->pFiles);
            ERR("Source file (just the first) = %s, target path = %s, bCopy: %d\n", debugstr_w(pszSrcList), debugstr_w(wszTargetPath), bCopy);
 
            SHFILEOPSTRUCTW op;
            ZeroMemory(&op, sizeof(op));
            op.pFrom = pszSrcList;
            op.pTo = wszTargetPath;
            op.hwnd = m_hwndSite;
            op.wFunc = bCopy ? FO_COPY : FO_MOVE;
            op.fFlags = FOF_ALLOWUNDO | FOF_NOCONFIRMMKDIR;
            int res = SHFileOperationW(&op);
            if (res)
            {
                ERR("SHFileOperationW failed with 0x%x\n", res);
                hr = E_FAIL;
            }
 
            return hr;
        }
        ERR("Error calling GetData\n");
        hr = E_FAIL;
    }
    else
    {
        ERR("No viable drop format\n");
        hr = E_FAIL;
    }
    return hr;
}
 
DWORD WINAPI CFSDropTarget::_DoDropThreadProc(LPVOID lpParameter)
{
    _DoDropData *data = static_cast<_DoDropData*>(lpParameter);
    CComPtr<IDataObject> pDataObject;
    HRESULT hr = CoGetInterfaceAndReleaseStream (data->pStream, IID_PPV_ARG(IDataObject, &pDataObject));
 
    if (SUCCEEDED(hr))
    {
        CComPtr<IAsyncOperation> pAsyncOperation;
        hr = data->This->_DoDrop(pDataObject, data->dwKeyState, data->pt, &data->pdwEffect);
        if (SUCCEEDED(pDataObject->QueryInterface(IID_PPV_ARG(IAsyncOperation, &pAsyncOperation))))
        {
            pAsyncOperation->EndOperation(hr, NULL, data->pdwEffect);
        }
    }
    //Release the CFSFolder and data object holds in the copying thread.
    data->This->Release();
    //Release the parameter from the heap.
    HeapFree(GetProcessHeap(), 0, data);
    return 0;
}
 
HRESULT CFSDropTarget_CreateInstance(LPWSTR sPathTarget, REFIID riid, LPVOID * ppvOut)
{
    return ShellObjectCreatorInit<CFSDropTarget>(sPathTarget, riid, ppvOut);
}