Capture when user click the X on the form

[Chong]

Is there a way to capture the event when a user click on the X button on the top right corner of a form? I want to do something with the event when a user click on the X on the form. However, I could not figure out how to capture that.

Any help is appreciated!

ljCharlie

[dynamic_sysop]

like this ...

Protected Overrides Sub WndProc(ByRef m As Message)
        If m.Msg = 161 Then
            If m.WParam.ToInt32 = 20 Then
                MessageBox.Show("you just clicked the X button!")
            End If
        End If
        MyBase.WndProc(m)
    End Sub

[Hole-In-One]

Ok this is kinda off the topic question but, where do you guys find this stuff?

Like:

m.Msg = 161
and
m.WParam.ToInt32 = 20

What is 161 and 20?

Where is the defenition of these numbers?

Just for future reference

[Chong]

Thanks a bunch, dynamic_sysop! It works, but yes, Hole-In-One, you're right.

Where do you guys find this stuff?

ljCharlie

[dynamic_sysop]

trial and error , i tend to try stuff like clicking on the toolbox of a form , then outputing the windows messages ( m.msg ) to Console.WriteLine
same with the wparams etc...

[Chong]

Thanks!

ljCharlie