FindResource为何找不到图标？

[qqwweerraahh]

这样找，找不到资源，返回NULL

HRSRC hRes=FindResource(NULL,MAKEINTRESOURCE(IDR_MAINFRAME),RT_ICON);

资源类型改成RT_GROUP_ICON可以找到，但SizeofResource返回的资源大小始终是32字节，而实际图标文件有几个kb左右

HRSRC hRes=FindResource(NULL,MAKEINTRESOURCE(IDR_MAINFRAME),RT_GROUP_ICON);
CString str;
str.Format("%d",SizeofResource(NULL,hRes));
MessageBox(str);

为什么？如何做？

[WaistCoat13]

返回NULL，GetLastError看下错误码

[qqwweerraahh]

GetLastError返回1814，在哪可以找到对应错误原因啊？

[tcbhj]

#pragma pack(1)
typedef struct _GRPICONDIRENTRY {
   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  _GRPICONDIR {
   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()

HRSRC hRes = FindResource(NULL, MAKEINTRESOURCE(IDI_ICON), RT_GROUP_ICON);
HGLOBAL hGlobal = LoadResource(NULL, hRes);
LPVOID lpIconDir = LockResource(hGlobal);
hRes = FindResource(NULL, MAKEINTRESOURCE(((LPGRPICONDIR)lpIconDir)->idEntries[0].nID ), RT_ICON);
hGlobal = LoadResource(NULL, hRes);
LPVOID lpIcon = LockResource(hGlobal);

http://msdn.microsoft.com/en-us/library/ms997538.aspx