Close message box programmatically

Question

Hello,

I want close a MessageBox programmatically after some background process in Windows CE(C#.NET v 3.5).

Please anyone help me with sample code.

Thanks in advance.

Answer 1

Hi,
better way is own dialog with custom behavior.

But here is the dirty and quick way. :) In your project add reference to the assembly Microsoft.WindowsCE.Forms.

using System;

using System.Linq;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Threading;

using System.Runtime.InteropServices;

using Microsoft.WindowsCE.Forms;

namespace MessagBoxClose

{

public partial class Form1 : Form

{

private bool m_killHim;

private bool  m_threadAlive;

private Thread m_killThread;

private const uint GW_HWNDFIRST = 0;

private const int WM_CLOSE = 0x0010;

[DllImport("coredll.dll", EntryPoint="FindWindowW", SetLastError=true)]

private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

public Form1()

{

m_killHim = false;

m_threadAlive = true;

InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)

{

ThreadStart myThread = () =>

{

while (m_threadAlive)

{

Thread.Sleep(200);

if (m_killHim)

{

IntPtr nextW = FindWindow(null, "MyDialogConstant");

if (nextW != IntPtr.Zero)

{

Message closeMessage = Message.Create(nextW, WM_CLOSE, IntPtr.Zero, IntPtr.Zero);

MessageWindow.SendMessage(ref closeMessage);

}

}

}

};

m_killThread = new Thread(myThread);

m_killThread.Start();

}

private void button1_Click(object sender, EventArgs e)

{

m_killHim = true;

MessageBox.Show("MyT", "MyDialogConstant");

m_killHim = false;

}

}

}

HTH
Rene Stein
http://blog.renestein.net

Answer 2

For me, it display a message box from another dll and the header also varies depends on which driver being selected. How to close those message boxes from program? Please help

Answer 3

Basically the same way as in the above sample - using the FindWindow API.

You have to call 'FindWindow' multiple times - once for each message box you'd expect to appear.

---

MVP Windows Embedded

Answer 4

If Message box has Yes n No buttons , its not working. Is there any way to do ?

Answer 5

Hi

If Message box has Yes n No buttons , its not working. Is there any way to do ?

You can use the API PostMessage to send ID_OK or ID_CANCEL, it is available in OpenNETCF.Win32.Win32Window.PostMessage, like this