How can I put the monitor to sleep when using C#/WPF (Not WinForms!)

Question

The trouble I'm having is with using...

[DllImport("user32")]
public static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);

...and then...

SendMessage(???, WM_SYSCOMMAND, (IntPtr)SC_MONITORPOWER, (IntPtr)MONITOR_OFF);

SendMessage wants the Form's Handle but I'm not using Forms so cannot get the Handle.

Is there any other way I can put the monitor to sleep OR get the Handle in WPF?

possible duplicate of [Finding the handle to a WPF window](http://stackoverflow.com/questions/1556182/finding-the-handle-to-a-wpf-window) — Hans Passant, Oct 30 '11 at 18:57

Yahia · Accepted Answer · 2011-10-31T04:15:42.337

5

To get the Handle for a WPF Window use:

  new WindowInteropHelper(YourWPFWindow).Handle

edited Oct 31 '11 at 04:15

answered Oct 30 '11 at 18:34

Yahia

score 3 · Answer 2 · answered Oct 30 '11 at 18:34

3

answered Oct 30 '11 at 18:34

SLaks

score 3 · Answer 3 · answered Oct 30 '11 at 19:32

3

Or use

HwndSource source = (HwndSource)HwndSource.FromVisual(this);
source.Handle...

to get a handle from a single element in the form, also runs for the whole window.

answered Oct 30 '11 at 19:32

CShark

3 Answers3