[RESOLVED] [2005] Win32Exception

[Jumpercables]

I have used this code in many of my applications but now it seems to be erroring and I'm not sure what is causing the error. Basically when I click on the NotifyIcon I want o show the form and when its minimized i want to not show up in the taskbar.

Private Sub Main_SizeChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.SizeChanged
        If Me.WindowState = FormWindowState.Minimized Then
            Me.ShowInTaskbar = False
            NotifyIcon.Visible = True
        Else
           [COLOR=Red] Me.ShowInTaskbar = True 'Error[/COLOR]
            NotifyIcon.Visible = False
        End If
    End Sub

Here is the execption that is getting thrown.
System.ComponentModel.Win32Exception was unhandled ErrorCode=-2147467259 Message="Error creating window handle." Source="System.Windows.Forms"

Any ideas for a solution?

Thanks In Advance

[ZaNi]

Instead of having a form that has the showInTaskbar property changed, consider having one form that always shows in the taskbar. Then when you click the NotifyIcon, open a new instance of that form, and when minimising, close the instance of that form. That may solve your problem.

[jmcilhinney]

I disagree with ZaNi's solution. What you're doing is the appropriate way to do things. I can't tell you why you're getting that issue because I've done what you're doing many times before and it's been fine. Have you tried the same thing with a different form? Have you tried rebuilding (not just building) your project? How are you restoring the form? Are you using the DoubleClick event of the NotifyIcon something like this:

Private Sub NotifyIcon1_DoubleClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles NotifyIcon.DoubleClick
    Me.WindowState = FormWindowState.Normal
End Sub

Are you Closing the form before that point?

[one_&_only]

how about

Private Sub Main_SizeChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.SizeChanged
       If Me.WindowState = FormWindowState.Minimized Then
            Me.ShowInTaskbar = False
            NotifyIcon.Visible = True
        Else
            Me.Show()
            WindowState = FormWindowState.Normal
        End If
    End Sub

[jmcilhinney]

how about

Private Sub Main_SizeChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.SizeChanged
       If Me.WindowState = FormWindowState.Minimized Then
            Me.ShowInTaskbar = False
            NotifyIcon.Visible = True
        Else
            Me.Show()
            WindowState = FormWindowState.Normal
        End If
    End Sub

The SizeChanged event is being handled. It's setting the WindowState to Normal that will raise the event, so setting the WindowState to Normal in the event handler isn't useful. Plus that doesn't change the task bar visibility of the form or the tray icon.

[Jumpercables]

I have tried rebuilding and tried it on a different project and works fine. I am triggering the event by using the click event.

Private Sub NotifyIcon_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles NotifyIcon.MouseClick
        If e.Button = Windows.Forms.MouseButtons.Left Then
            Me.WindowState = FormWindowState.Normal
        End If
    End Sub

[Jumpercables]

I seems I have fixed this problem by removing a minimize on lostfocus event within a textbox.

[jmcilhinney]

As the documentation says, don't use the GotFocus or LostFocus events except under the very specific circumstances that it mentions. Use Enter and Leave for most controls and Activated and Deactivate for forms.