是否可以保存DWM_THUMBNAIL图像？

Question

我尝试编写一个程序，获取THUMBNAIL图像，然后对项目进行屏幕截图。当我打开项目图像时，THUMBNAIL图像不在那里。但当我按下键盘上的Print Screen按钮时，图像是正常的。

有人能帮我吗？

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Answer 1

    private void UpdateThumb()
    {
        if (thumb != IntPtr.Zero)
        {
            PSIZE size;
            DwmQueryThumbnailSourceSize(thumb, out size);

            DWM_THUMBNAIL_PROPERTIES props = new DWM_THUMBNAIL_PROPERTIES();

            props.fVisible = true;
            props.dwFlags = DWM_TNP_VISIBLE | DWM_TNP_RECTDESTINATION | DWM_TNP_OPACITY;
            props.opacity = (byte)opacity.Value;
            props.rcDestination = new Rect(image.Left, image.Top, image.Right, image.Bottom);

            if (size.x < image.Width)
                props.rcDestination.Right = props.rcDestination.Left + size.x;

            if (size.y < image.Height)
                props.rcDestination.Bottom = props.rcDestination.Top + size.y;


            DwmUpdateThumbnailProperties(thumb, ref props);
        }
    }