private static Bitmap CaptureWindowArea(IntPtr handle, Point cropPos, Size cropSize)
{
IntPtr dc = User32.GetWindowDC(handle);
if (dc != null)
{
IntPtr hdcDest = GDI32.CreateCompatibleDC(dc);
IntPtr hBitmap = GDI32.CreateCompatibleBitmap(dc, cropSize.Width, cropSize.Height);
IntPtr hOld = GDI32.SelectObject(hdcDest, hBitmap);
if (GDI32.BitBlt(hdcDest, 0, 0, cropSize.Width, cropSize.Height, dc, cropPos.X, cropPos.Y, GDI32.TernaryRasterOperations.SRCCOPY))
{
GDI32.SelectObject(hdcDest, hOld);
GDI32.DeleteDC(hdcDest);
User32.ReleaseDC(handle, dc);
Bitmap b = Image.FromHbitmap(hBitmap);
GDI32.DeleteObject(hBitmap);
for (int x = 0; x < b.Width; x++)
{
for (int y = 0; y < b.Height; y++)
{
if (b.GetPixel(x, y) != Color.FromArgb(255, 0, 0, 0))
{
return(b);
}
}
}
b.Dispose();
}
else
{
GDI32.DeleteDC(hdcDest);
User32.ReleaseDC(handle, dc);
GDI32.DeleteObject(hBitmap);
}
}
return(null);
}