周报_2012第13周（2012/03/252012/03/31）

项目：X保密项目

2012.03.28

// #pragmas are used here to insure that the structure's
// packing in memory matches the packing of the EXE or DLL.
#pragma pack( push )
#pragma pack( 2 )
typedef struct
{
    BYTE    bWidth;               // Width, in pixels, of the image
    BYTE    bHeight;              // Height, in pixels, of the image
    BYTE    bColorCount;          // Number of colors in image (0 if >=8bpp)
    BYTE    bReserved;            // Reserved
    WORD    wPlanes;              // Color Planes
    WORD    wBitCount;            // Bits per pixel
    DWORD    dwBytesInRes;         // how many bytes in this resource?
    WORD    nID;                  // the ID
} GRPICONDIRENTRY, *LPGRPICONDIRENTRY;

typedef struct
{
    WORD            idReserved;   // Reserved (must be 0)
    WORD            idType;       // Resource type (1 for icons)
    WORD            idCount;      // How many images?
    GRPICONDIRENTRY    idEntries[1]; // The entries for each image
} GRPICONDIR, *LPGRPICONDIR;
#pragma pack( pop )

枚举图标资源名

Callback for enumerating resources in a DLL/EXE

    // Using an ID from the group, Find, Load and Lock the RT_ICON, Get the group icon.
    if( (hRsrc = FindResourceW( hInstance, nIndex, RT_GROUP_ICON )) == NULL )
        return NULL;
    if( (hGlobal = LoadResource( hInstance, hRsrc )) == NULL )
        return NULL;
    if( (lpRes = LockResource(hGlobal)) == NULL )
        return NULL;

    // Get the identifier of the icon that is most appropriate for the video display.
    LPGRPICONDIR lpGrpIconDir = (LPGRPICONDIR)lpRes;
    LPGRPICONDIRENTRY lpIconEntryAppropriate = QueryAppropriateSizeIcon(lpGrpIconDir, nSizeAppropriate);

    int nID;
    if (lpIconEntryAppropriate)
    {
        nID = lpIconEntryAppropriate->nID;
    }
    else
    {
        nID = LookupIconIdFromDirectoryEx((PBYTE)lpRes, TRUE, nSizeAppropriate, nSizeAppropriate, LR_DEFAULTCOLOR);
    }

    if( (hRsrc = FindResource( hInstance, MAKEINTRESOURCE(nID), RT_ICON )) == NULL )
        return NULL;
    if( (hGlobal = LoadResource( hInstance, hRsrc )) == NULL )
        return NULL;
    // Here, lpRes points to an ICONIMAGE structure
    if( (lpRes = LockResource(hGlobal)) == NULL )
        return NULL;

    // Let the OS make us an icon
    hIcon = CreateIconFromResourceEx( (LPBYTE)lpRes, SizeofResource(hInstance,hRsrc), TRUE, 0x00030000
        , nSizeAppropriate, nSizeAppropriate, LR_DEFAULTCOLOR );

LPGRPICONDIRENTRY CImageMgr::QueryAppropriateSizeIcon(LPGRPICONDIR lpGrpIconDir, int& nSizeAppropriate)
{
    LPGRPICONDIRENTRY lpIconRet = NULL;
    int nTmp;

    vector<LPGRPICONDIRENTRY> vector_icon_fit;   
    for (int i = 0; i < lpGrpIconDir->idCount; ++i)
    {
        LPGRPICONDIRENTRY lpIconEntry = &(lpGrpIconDir->idEntries[i]);
        // 查找最匹配的尺寸
        nTmp = (0 == lpIconEntry->bWidth) ? 256 : lpIconEntry->bWidth;
        if (nSizeAppropriate == nTmp)
        {
            vector_icon_fit.push_back(lpIconEntry);           
        }
    }

    if (0 == vector_icon_fit.size())
    {
        int nBetterSize = 257;
        // 如果没有最匹配的尺寸则查找最小的更大尺寸       
        for (int i = 0; i < lpGrpIconDir->idCount; ++i)
        {
            LPGRPICONDIRENTRY lpIconEntry = &(lpGrpIconDir->idEntries[i]);
            nTmp = (0 == lpIconEntry->bWidth) ? 256 : lpIconEntry->bWidth;
            if ((nTmp > nSizeAppropriate) && (nBetterSize > nTmp))
            {
                nBetterSize = nTmp;
            }
        }
        if (257 == nBetterSize)
        {
            nBetterSize = -1;
            // 如果没有最匹配的尺寸则查找最大的更小尺寸
            for (int i = 0; i < lpGrpIconDir->idCount; ++i)
            {
                LPGRPICONDIRENTRY lpIconEntry = &(lpGrpIconDir->idEntries[i]);
                nTmp = (0 == lpIconEntry->bWidth) ? 256 : lpIconEntry->bWidth;
                if ((nTmp < nSizeAppropriate) && (nBetterSize < nTmp))
                {
                    nBetterSize = nTmp;
                }
            }
        }

        nSizeAppropriate = nBetterSize;

        for (int i = 0; i < lpGrpIconDir->idCount; ++i)
        {
            LPGRPICONDIRENTRY lpIconEntry = &(lpGrpIconDir->idEntries[i]);
            nTmp = (0 == lpIconEntry->bWidth) ? 256 : lpIconEntry->bWidth;
            if (nBetterSize == nTmp)
            {
                vector_icon_fit.push_back(lpIconEntry);
            }
        }
    }

    // Bits per pixel 最高颜色位数
    int nBitsPixel = 0;
    int nPosMax = -1;
    for (int i = 0; i < vector_icon_fit.size(); ++i)
    {
        LPGRPICONDIRENTRY lpIconEntry = vector_icon_fit[i];
        if (nBitsPixel < lpIconEntry->wBitCount)
        {
            nBitsPixel = lpIconEntry->wBitCount;
            nPosMax = i;
        }
    }

    if (nPosMax > -1)
    {
        lpIconRet = vector_icon_fit[nPosMax];
    }

    return lpIconRet;
}

对比图标