public Image GetStaticThumbnail(IntPtr source)
{
var sourceContext = User32NativeMethods.GetDC(source);
User32NativeMethods.GetClientRect(source, out RECT windowRect);
var width = windowRect.Right - windowRect.Left;
var height = windowRect.Bottom - windowRect.Top;
// Check if there is anything to make thumbnail of
if ((width < WINDOW_SIZE_THRESHOLD) || (height < WINDOW_SIZE_THRESHOLD))
{
return(null);
}
var destContext = Gdi32NativeMethods.CreateCompatibleDC(sourceContext);
var bitmap = Gdi32NativeMethods.CreateCompatibleBitmap(sourceContext, width, height);
var oldBitmap = Gdi32NativeMethods.SelectObject(destContext, bitmap);
Gdi32NativeMethods.BitBlt(destContext, 0, 0, width, height, sourceContext, 0, 0, Gdi32NativeMethods.SRCCOPY);
Gdi32NativeMethods.SelectObject(destContext, oldBitmap);
Gdi32NativeMethods.DeleteDC(destContext);
User32NativeMethods.ReleaseDC(source, sourceContext);
Image image = Image.FromHbitmap(bitmap);
Gdi32NativeMethods.DeleteObject(bitmap);
return(image);
}
public Bitmap Capture()
{
if (!EnableWriterBitmap)
{
UpdateWriterBitmap();
}
IntPtr windowDC = User32NativeMethods.GetWindowDC(windowHandle);
IntPtr hDC = writerBitmapGraphcis.GetHdc();
Gdi32NativeMethods.BitBlt(hDC,
0,
0,
WriterBitmap.Width, WriterBitmap.Height,
windowDC,
CaptureBoundsInWindow.X,
CaptureBoundsInWindow.Y,
(int)Gdi32NativeMethods.TernaryRasterOperations.SRCCOPY);
writerBitmapGraphcis.ReleaseHdc(hDC);
User32NativeMethods.ReleaseDC(windowHandle, windowDC);
return(WriterBitmap);
}
