/// <summary>
/// THis function gets the screen shot of a window..
/// </summary>
/// <param name="windowHandle">This is the handle (in IntPtr form) of the window to get the screen shot of.</param>
/// <returns>Returns a bitmap of the window.</returns>
private static Bitmap GetWindowScreenShot(IntPtr windowHandle)
{
Rectangle windowRect = Rectangle.Empty;
if (windowHandle == IntPtr.Zero)
{
// Desktop image, so set rectangle appropriately.
windowRect = Screen.PrimaryScreen.Bounds;
}
else
{
// Check that window handle is valid and get the window size info.
Win32APIDataTypes.RECT rect = new Win32APIDataTypes.RECT();
if (!GetWindowRect(windowHandle, ref rect))
{
// Throw exception if window handle is invalid.
throw new ArgumentException("The window handle is not valid.");
}
// Set up the window rectangle.
windowRect = Rectangle.FromLTRB(rect.Left, rect.Top, rect.Right, rect.Bottom);
}
// Create a new bitmap the size of the primary display device
Bitmap bmpScreenShot = new Bitmap(windowRect.Width, windowRect.Height);
// Get a Graphics object from the bitmap so we can draw on it
Graphics gfx = Graphics.FromImage(bmpScreenShot);
// Get a win32 DC (Device Context) for destination blitting
IntPtr dcDestination = gfx.GetHdc();
// Now get a source DC from the window handle
IntPtr dcSource = GetWindowDC(windowHandle);
// Blit from the desktop's DC to our bitmap's DC
BitBlt(dcDestination, 0, 0, windowRect.Width, windowRect.Height, dcSource, 0, 0, SourceCopy);
// Release GDI and GDI+ objects
gfx.ReleaseHdc(dcDestination);
ReleaseDC(windowHandle, dcSource);
return(bmpScreenShot);
}
private static extern bool GetWindowRect(IntPtr hWnd, ref Win32APIDataTypes.RECT lpRect);
