public static Bitmap CaptureRectangle(Rectangle captureBounds)
{
IntPtr hDesktop = User32.GetDesktopWindow();
IntPtr hDC = User32.GetWindowDC(hDesktop);
IntPtr hDest = GDI32.CreateCompatibleDC(hDC);
IntPtr hBitmap = GDI32.CreateCompatibleBitmap(hDC, captureBounds.Width, captureBounds.Height);
IntPtr hOldBitmap = GDI32.SelectObject(hDest, hBitmap);
GDI32.BitBlt(hDest, 0, 0, captureBounds.Width, captureBounds.Height,
hDC, captureBounds.X, captureBounds.Y, CopyPixelOperation.SourceCopy | CopyPixelOperation.CaptureBlt);
Bitmap bitmap = null;
bool isRegionEmpty = true;
using (var graphics = Graphics.FromHwnd(hDesktop))
{
isRegionEmpty = WindowCapture.IsRegionEmpty(graphics, captureBounds);
}
if (isRegionEmpty)
{
bitmap = Bitmap.FromHbitmap(hBitmap);
}
else
{
float xDpi = 96F, yDpi = 96F;
using (var tmp = Bitmap.FromHbitmap(hBitmap))
{
xDpi = tmp.HorizontalResolution;
yDpi = tmp.VerticalResolution;
}
bitmap = WindowCapture.CreateEmpty(captureBounds.Width, captureBounds.Height, PixelFormat.Format32bppArgb, Color.Transparent, xDpi, yDpi);
using (var graphics = Graphics.FromImage(bitmap))
{
foreach (var screen in Screen.AllScreens)
{
var bounds = screen.Bounds;
bounds.Offset(-captureBounds.X, -captureBounds.Y);
graphics.DrawImage(bitmap, bounds, bounds.X, bounds.Y, bounds.Width, bounds.Height, GraphicsUnit.Pixel);
}
}
}
GDI32.SelectObject(hDest, hOldBitmap);
GDI32.DeleteObject(hBitmap);
GDI32.DeleteDC(hDest);
User32.ReleaseDC(hDesktop, hDC);
return(bitmap);
}
public static Bitmap CaptureWindow()
{
Bitmap bitmap = null;
try
{
var captureBounds = Utils.GetScreenBounds();
bitmap = WindowCapture.CaptureRectangle(captureBounds);
}
catch (Exception ex)
{
// TODO: handle exception
Debug.WriteLine(ex.Message);
throw;
}
return(bitmap);
}
