/// <summary>
/// Creates a Snapshot instance from a Wpf Window.
/// </summary>
/// <param name="window">The Wpf Window, identifying the window to capture from.</param>
/// <param name="windowSnapshotMode">Determines if window border region should captured as part of Snapshot.</param>
/// <returns>A Snapshot instance of the pixels captured.</returns>
public static Snapshot SnapshotFromWindow(Visual window, WindowSnapshotMode windowSnapshotMode)
{
Snapshot result;
HwndSource source = (HwndSource)PresentationSource.FromVisual(window);
if (source == null)
{
throw new InvalidOperationException("The specified Window is not being rendered.");
}
IntPtr windowHandle = source.Handle;
result = Snapshot.FromWindow(windowHandle, windowSnapshotMode);
return(result);
}
/// <summary>
/// Creates a Snapshot instance populated with pixels sampled from the rectangle of the specified window.
/// </summary>
/// <param name="windowHandle">The Win32 window handle (also known as an HWND), identifying the window to capture from.</param>
/// <param name="windowSnapshotMode">Determines if window border region should captured as part of Snapshot.</param>
/// <returns>A Snapshot instance of the pixels captured.</returns>
public static Snapshot FromWindow(IntPtr windowHandle, WindowSnapshotMode windowSnapshotMode)
{
Snapshot result;
RECT rect;
if (windowSnapshotMode == WindowSnapshotMode.ExcludeWindowBorder)
{
if (!NativeMethods.GetClientRect(windowHandle, out rect))
{
throw new Win32Exception();
}
IntPtr deviceContext = NativeMethods.GetDC(windowHandle);
try
{
if (deviceContext == IntPtr.Zero)
{
throw new Win32Exception();
}
result = FromBitmap(CaptureBitmap(deviceContext, rect.ToRectangle()));
}
finally
{
NativeMethods.ReleaseDC(windowHandle, deviceContext);
}
}
else if (windowSnapshotMode == WindowSnapshotMode.IncludeWindowBorder)
{
if (!NativeMethods.GetWindowRect(windowHandle, out rect))
{
throw new Win32Exception();
}
result = FromRectangle(rect.ToRectangle());
}
else
{
throw new ArgumentOutOfRangeException("windowSnapshotMode");
}
return(result);
}
