Send window message to WPF application from another WPF application

Question

I used this code in the server side

    void Window_Loaded(object sender, RoutedEventArgs e)
    {

        HwndSource source = HwndSource.FromHwnd(new WindowInteropHelper(this).Handle);
        source.AddHook(new HwndSourceHook(WndProc));

    }
    private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
    {
        // Handle messages...

            var htLocation = DefWindowProc(hwnd, msg, wParam, lParam).ToInt32();

            if (msg == 1)
            {
            MessageBox.Show("" + msg);
            }


        return new IntPtr(1);
    }

And I send the message from the client side like this

SendMessage(m_Process.MainWindowHandle, 1, (IntPtr)(-1), (IntPtr)(-1));

The problem is that the server side cannot receive this message, why?

Answer 1

I found the mistake

the message id I sent must be 0x0112 not 1 this is for windows command