public Image CaptureRectangle(Rectangle windowRect)
{
if ((windowRect.Height <= 0) || windowRect.Width <= 0)
{
return(null); //throw new ArgumentException("The Rectangle has no size", "windowRect");
}
IntPtr _handle = User32.GetDesktopWindow();
// get te hDC of the target window
IntPtr _hdcSrc = User32.GetWindowDC(_handle);
// create a device context we can copy to
IntPtr _hdcDest = GDI32.CreateCompatibleDC(_hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr _hBitmap = GDI32.CreateCompatibleBitmap(_hdcSrc, windowRect.Width, windowRect.Height);
// select the bitmap object
IntPtr _hOld = GDI32.SelectObject(_hdcDest, _hBitmap);
// bitblt over
GDI32.BitBlt(_hdcDest, 0, 0, windowRect.Width, windowRect.Height,
_hdcSrc, windowRect.Left, windowRect.Top, GDI32.SRCCOPY);
// restore selection
GDI32.SelectObject(_hdcDest, _hOld);
// clean up
GDI32.DeleteDC(_hdcDest);
User32.ReleaseDC(_handle, _hdcSrc);
// get a .NET image object for it
Image _img = Image.FromHbitmap(_hBitmap);
// free up the Bitmap object
GDI32.DeleteObject(_hBitmap);
return(_img);
}
public Image CaptureWindow(IntPtr handle)
{
// get te hDC of the target window
IntPtr _hdcSrc = User32.GetWindowDC(handle);
// get the size
User32.RECT _windowRect = new User32.RECT();
User32.GetWindowRect(handle, ref _windowRect);
int _width = _windowRect.Right - _windowRect.Left;
int _height = _windowRect.Bottom - _windowRect.Top;
// create a device context we can copy to
IntPtr _hdcDest = GDI32.CreateCompatibleDC(_hdcSrc);
// create a bitmap we can copy it to,
// using GetDeviceCaps to get the width/height
IntPtr _hBitmap = GDI32.CreateCompatibleBitmap(_hdcSrc, _width, _height);
// select the bitmap object
IntPtr _hOld = GDI32.SelectObject(_hdcDest, _hBitmap);
// bitblt over
GDI32.BitBlt(_hdcDest, 0, 0, _width, _height, _hdcSrc, 0, 0, GDI32.SRCCOPY);
// restore selection
GDI32.SelectObject(_hdcDest, _hOld);
// clean up
GDI32.DeleteDC(_hdcDest);
User32.ReleaseDC(handle, _hdcSrc);
// get a .NET image object for it
Image _img = Image.FromHbitmap(_hBitmap);
// free up the Bitmap object
GDI32.DeleteObject(_hBitmap);
return(_img);
}