GDI+ ISteam 无法创建图像和缩略图？

Question

我正在尝试读取一个文件并创建一个流对象。从这个流对象，我正在创建一个 GDI 图像。我注意到它不起作用，尤其是 if (image && (Ok == image->GetLastStatus())) 返回状态 3 的行，知道是什么问题吗？我正在尝试使用 EMF 文件作为测试：

unsigned char* filebuf;
    FILE* fp;
    size_t sz;

    Image* image = NULL;
    Image* thumbnail = NULL;
    
    fp = fopen(filename, "rb");            //Statement   1
    if (fp == NULL)
    {
        printf("\nCan't open file or file doesn't exist.\r\n");
        exit(0);
    }
    fseek(fp, 0L, SEEK_END);
    sz = ftell(fp);
    fseek(fp, 0L, SEEK_SET);

    filebuf = (unsigned char*)malloc(sz);

    if (filebuf)
        fread(filebuf, sz, 1, fp);
        
        //lets create stream from memory and then we will create image.
        IStream* stream = SHCreateMemStream(filebuf, sz);
        image = Gdiplus::Image::FromStream(stream);
        if (image && (Ok == image->GetLastStatus())) {
            //printf("Image loaded\n");
            thumbnail = image->GetThumbnailImage(100, 100, NULL, NULL);
            if (thumbnail && (Ok == thumbnail->GetLastStatus())) {
                //printf("Thumbnail created\n");
            }
        }
    
    //printf("Done\n");

    if (image) delete image;
    if (thumbnail) delete thumbnail;    
    return 0;

它应该创建流对象，然后它应该能够创建图像和缩略图。