util.cpp

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#include "precomp.h"
#include <winver.h>

typedef struct _LANGCODEPAGE
{
    WORD wLanguage;
    WORD wCodePage;
} LANGCODEPAGE, *PLANGCODEPAGE;

HRESULT
IsSameObject(IN IUnknown *punk1, IN IUnknown *punk2)
{
    HRESULT hRet;

    hRet = punk1->QueryInterface(IID_PPV_ARG(IUnknown, &punk1));
    if (!SUCCEEDED(hRet))
        return hRet;

    hRet = punk2->QueryInterface(IID_PPV_ARG(IUnknown, &punk2));

    punk1->Release();

    if (!SUCCEEDED(hRet))
        return hRet;

    punk2->Release();

    /* We're dealing with the same object if the IUnknown pointers are equal */
    return (punk1 == punk2) ? S_OK : S_FALSE;
}

HMENU
LoadPopupMenu(IN HINSTANCE hInstance,
              IN LPCWSTR lpMenuName)
{
    HMENU hMenu, hSubMenu = NULL;

    hMenu = LoadMenuW(hInstance, lpMenuName);
    if (hMenu != NULL)
    {
        hSubMenu = GetSubMenu(hMenu, 0);
        if ((hSubMenu != NULL) &&
            !RemoveMenu(hMenu, 0, MF_BYPOSITION))
        {
            hSubMenu = NULL;
        }

        DestroyMenu(hMenu);
    }

    return hSubMenu;
}

HMENU
FindSubMenu(IN HMENU hMenu,
            IN UINT uItem,
            IN BOOL fByPosition)
{
    MENUITEMINFOW mii;

    mii.cbSize = sizeof(mii);
    mii.fMask = MIIM_SUBMENU;

    if (GetMenuItemInfoW(hMenu, uItem, fByPosition, &mii))
    {
        return mii.hSubMenu;
    }

    return NULL;
}

BOOL
GetCurrentLoggedOnUserName(OUT LPWSTR szBuffer,
                           IN DWORD dwBufferSize)
{
    DWORD dwType;
    DWORD dwSize;

    /* Query the user name from the registry */
    dwSize = (dwBufferSize * sizeof(WCHAR)) - 1;
    if (RegQueryValueExW(hkExplorer,
                         L"Logon User Name",
                         0,
                         &dwType,
                         (LPBYTE)szBuffer,
                         &dwSize) == ERROR_SUCCESS &&
        (dwSize / sizeof(WCHAR)) > 1 &&
        szBuffer[0] != L'\0')
    {
        szBuffer[dwSize / sizeof(WCHAR)] = L'\0';
        return TRUE;
    }

    /* Fall back to GetUserName() */
    dwSize = dwBufferSize;
    if (!GetUserNameW(szBuffer, &dwSize))
    {
        szBuffer[0] = L'\0';
        return FALSE;
    }

    return TRUE;
}

BOOL
FormatMenuString(IN HMENU hMenu,
                 IN UINT uPosition,
                 IN UINT uFlags,
                 ...)
{
    va_list vl;
    MENUITEMINFOW mii;
    WCHAR szBuf[128];
    WCHAR szBufFmt[128];

    /* Find the menu item and read the formatting string */
    mii.cbSize = sizeof(mii);
    mii.fMask = MIIM_STRING;
    mii.dwTypeData = szBufFmt;
    mii.cch = _countof(szBufFmt);
    if (GetMenuItemInfoW(hMenu, uPosition, uFlags, &mii))
    {
        /* Format the string */
        va_start(vl, uFlags);
        _vsntprintf(szBuf,
                    _countof(szBuf) - 1,
                    szBufFmt,
                    vl);
        va_end(vl);
        szBuf[_countof(szBuf) - 1] = L'\0';

        /* Update the menu item */
        mii.dwTypeData = szBuf;
        if (SetMenuItemInfo(hMenu, uPosition, uFlags, &mii))
        {
            return TRUE;
        }
    }

    return FALSE;
}

BOOL
GetExplorerRegValueSet(IN HKEY hKey,
                       IN LPCWSTR lpSubKey,
                       IN LPCWSTR lpValue)
{
    WCHAR szBuffer[MAX_PATH];
    HKEY hkSubKey;
    DWORD dwType, dwSize;
    BOOL Ret = FALSE;

    StringCbCopyW(szBuffer, sizeof(szBuffer),
                  L"Software\\Microsoft\\Windows\\CurrentVersion\\Explorer");
    if (FAILED_UNEXPECTEDLY(StringCbCatW(szBuffer, sizeof(szBuffer), L"\\")))
        return FALSE;
    if (FAILED_UNEXPECTEDLY(StringCbCatW(szBuffer, sizeof(szBuffer), lpSubKey)))
        return FALSE;

    dwSize = sizeof(szBuffer);
    if (RegOpenKeyExW(hKey,
                      szBuffer,
                      0,
                      KEY_QUERY_VALUE,
                      &hkSubKey) == ERROR_SUCCESS)
    {
        ZeroMemory(szBuffer, sizeof(szBuffer));

        if (RegQueryValueExW(hkSubKey,
                             lpValue,
                             0,
                             &dwType,
                             (LPBYTE)szBuffer,
                             &dwSize) == ERROR_SUCCESS)
        {
            if ((dwType == REG_DWORD) && (dwSize == sizeof(DWORD)))
                Ret = *((PDWORD)szBuffer) != 0;
            else if (dwSize > 0)
                Ret = *((PWCHAR)szBuffer) != 0;
        }

        RegCloseKey(hkSubKey);
    }
    return Ret;
}

BOOL
GetVersionInfoString(IN LPCWSTR szFileName,
                     IN LPCWSTR szVersionInfo,
                     OUT LPWSTR szBuffer,
                     IN UINT cbBufLen)
{
    LPVOID lpData = NULL;
    WCHAR szSubBlock[128];
    WCHAR *lpszLocalBuf = NULL;
    LANGID UserLangId;
    PLANGCODEPAGE lpTranslate = NULL;
    DWORD dwLen;
    DWORD dwHandle;
    UINT cbTranslate;
    UINT cbLen;
    BOOL bRet = FALSE;
    UINT i;

    dwLen = GetFileVersionInfoSizeW(szFileName, &dwHandle);

    if (dwLen > 0)
    {
        lpData = HeapAlloc(hProcessHeap, 0, dwLen);

        if (lpData != NULL)
        {
            if (GetFileVersionInfoW(szFileName,
                                    0,
                                    dwLen,
                                    lpData) != 0)
            {
                UserLangId = GetUserDefaultLangID();

                VerQueryValueW(lpData,
                               L"\\VarFileInfo\\Translation",
                               (LPVOID*)&lpTranslate,
                               &cbTranslate);

                for (i = 0; i < cbTranslate / sizeof(LANGCODEPAGE); i++)
                {
                    /* If the bottom eight bits of the language id's
                    match, use this version information (since this
                    means that the version information and the users
                    default language are the same). */
                    if (LOBYTE(lpTranslate[i].wLanguage) == LOBYTE(UserLangId))
                    {
                        wnsprintf(szSubBlock,
                                  _countof(szSubBlock),
                                  L"\\StringFileInfo\\%04X%04X\\%s",
                                  lpTranslate[i].wLanguage,
                                  lpTranslate[i].wCodePage,
                                  szVersionInfo);

                        if (VerQueryValueW(lpData,
                                           szSubBlock,
                                           (LPVOID*)&lpszLocalBuf,
                                           &cbLen) != 0)
                        {
                            wcsncpy(szBuffer, lpszLocalBuf, cbBufLen / sizeof(*szBuffer));

                            bRet = TRUE;
                            break;
                        }
                    }
                }
            }

            HeapFree(hProcessHeap, 0, lpData);
            lpData = NULL;
        }
    }

    return bRet;
}