读取资源中的GIF文件相应像素宽高度

代码参考了如下网页的实现：

https://www.cnblogs.com/zy791976083/p/9921069.html

整理成一个函数：

BOOL GetResGifSize(long nResId, LPCTSTR name, long *lnWidth, long *lnHeight)

{

    HRSRC hRsrc = FindResource(NULL, MAKEINTRESOURCE(nResId), name);

    if (NULL == hRsrc) {

        return FALSE;

    }

    DWORD dwSize = SizeofResource(NULL, hRsrc);

    HGLOBAL hGlobal = LoadResource(NULL, hRsrc);

    if (NULL == hGlobal) {

        CloseHandle(hRsrc);

        return FALSE;

    }

    unsigned char* pBuffer = (unsigned char*)LockResource(hGlobal);

    if (NULL == pBuffer) {

        CloseHandle(hRsrc);

        FreeResource(hGlobal);

        return FALSE;

    }

    //判断是否为GIF文件

    if(pBuffer[] != 0x47 && pBuffer[] != 0x49 && pBuffer[] != 0x46 && pBuffer[] != 0x38){

        return FALSE;

    }

    //读取宽高

    for(int i = ; i < dwSize ; i++)

    {

        if(pBuffer[i] == 0x00 && pBuffer[i+] == 0x2c)

        {

            *lnWidth = (pBuffer[i+]<<) | pBuffer[i+];

            *lnHeight = (pBuffer[i+]<<) | pBuffer[i+];

            UnlockResource(hGlobal);

            FreeResource(hGlobal);

            return TRUE;

        }

    }

    UnlockResource(hGlobal);

    FreeResource(hGlobal);

    return FALSE;

}