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VB.net MyBase not valid within module

Posted on 2013-06-04
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Last Modified: 2013-06-17
I have some code I want to reuse in several of my apps written in VB.net. I would like to put them in a module/class so I can reference them from other apps. One sub routine doesn't like being in a class\module and I was wondering how it coud be rewritten:

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        '
        'Have the base class handle all messages.
        MyBase.WndProc(m)
        '
        'Check if a new window has been created.
        If m.Result.ToInt32 = WM_CREATE Then
            '
            'Check the new window to see if it has the charateristics that we are looking for. Namely that is has the Title that we want to find.
            windowHandle = FindWindow(vbNullString, inputTitle)
            '
            'Make sure that the WindowHandle is not 0 which should mean it have a handle to the Inputbox window that we are wanting.
        ElseIf windowHandle > 0 Then
            '
            'Call the code to set the textbox to a password textbox. 
            setPassword()
            '
            'Reset the handle back to 0 since the window handle will be different each time you display Inputbox window.
            windowHandle = 0
        End If
    End Sub

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VB doesn't let me put a Protected Overrrides in a module and it also doesn't like MyBase in a class or module. Any suggestions?
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Question by:mossmis
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3 Comments
 
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Expert Comment

by:Mike Tomlinson
ID: 39219473
WndProc() is specifically used with windows that have a message pump...so it can't be in a module since a module isn't a window.  You could encapsulate a NativeWindow() instance inside a class if you need to trap windows messages.
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Author Comment

by:mossmis
ID: 39219675
I'm not that saavy in .net. I'm coming from vb6 and never really got that complex for me. I guess I could just paste this code in all my apps as a work around, but it wouldn't be as organized as I'd like. If you can elaborate more on how to use it, I'd like to give it a try.
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LVL 86

Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 39219808
Well...normally WndProc() would be in a form (or some kind of derived control) right?
Public Class Form1

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        Select Case m.Msg

        End Select
        MyBase.WndProc(m)
    End Sub

End Class

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You could instead create a Class to act as a receiver for windows messages like this:
Public Class MyNativeWindow
    Inherits NativeWindow

    Private Const HWND_MESSAGE As Integer = -3

    Public Sub New()
        Dim cp As New CreateParams()
        cp.Parent = HWND_MESSAGE
        Me.CreateHandle(cp)
    End Sub

    Protected Overrides Sub WndProc(ByRef m As System.Windows.Forms.Message)
        Select Case m.Msg

        End Select
        MyBase.WndProc(m)
    End Sub

End Class

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Obviously you'd need to add more code so that it is registered for the kind of messages you want.  You can then simply add a Reference to this class project in new projects so you could you use it.  You'd still have to create an instance of it though.
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