Problem with remotly turn on/off monitor

[emhiil]

Hi!

I'm trying to remotly turn on/off my monitor using this code below. The problem is whenever I call the method that turn on/off the monitor from within the tcp asynchronous receive data method, the application just ends with no exception. So i put in a delegate but the same problem was still there.

What is the correct way of doing this?

public delegate void SendMessageCallback(int hWnd, int hMsg, int wParam, int lParam);

public int WM_SYSCOMMAND = 0x0112;
public int SC_MONITORPOWER = 0xF170;

[DllImport("user32.dll")]
private static extern int SendMessage(int hWnd, int hMsg, int wParam, int lParam);

public void OnDataReceived(IAsyncResult asyn)
{
	SocketPacket socketData = (SocketPacket)asyn.AsyncState;

	try
	{
		int iRx  = socketData.currentSocket.EndReceive(asyn);
		char[] chars = new char[iRx + 1];

		Decoder d = Encoding.UTF8.GetDecoder();
		int charLen = d.GetChars(socketData.dataBuffer, 0, iRx, chars, 0);

		String szData = new String(chars);

		if (szData.ToString().Substring(0, 4) == "1040")
	    {
			SendMonitorMessage(this.Handle.ToInt32(), WM_SYSCOMMAND, SC_MONITORPOWER, 2);
		}
	}
	catch { }
}

private void SendMonitorMessage(int hWnd, int hMsg, int wParam, int lParam)
{
	if (InvokeRequired)
	{
		this.Invoke(new SendMessageCallback(this.OnSendMonitorMessage), new object[] { hWnd, hMsg, wParam, lParam });
	}
	else
	{
		this.OnSendMonitorMessage(hWnd, hMsg, wParam, lParam);
	}
}

private void OnSendMonitorMessage(int hWnd, int hMsg, int wParam, int lParam)
{
	SendMessage(hWnd, hMsg, wParam, lParam);
}

[Christian Binder]

Did you try using breakpoints an look whats happening?
Maybe you also take a look into window's error-log/event-viewer.