In my ComboBox, I am trying to post the CBN_EDITCHANGE message after the
CBN_SELCHANGE is received, but I am having no luck.  I can trap for the
CBN_SELCHANGE message, but I cannot post the CBN_EDITCHANGE message.  I think
my PostMessage parameters are wrong, but I cannot find what they should be. 
Any help would be greatly appreciated.  Thanks.

Here is my code.  I am using VS 2003 and Visual Basic.

Private Declare Function PostMessage Lib "user32" Alias "PostMessageA" _
        (ByVal hwnd As Long, _
        ByVal wMsg As Long, _
        ByVal wParam As Long, _
        ByVal lParam As Long) As Long


Protected Overrides Sub WndProc(ByRef m As Message)
        MyBase.WndProc(m)

        Const CBN_SELCHANGE As Int32 = &H1
        Const CBN_EDITCHANGE As Int32 = &H5
        Const CBN_EDITUPDATE As Int32 = &H6
        Const CBN_CLOSEUP As Int32 = &H8
        Const CBN_SELENDOK As Int32 = &H9
        Const WM_COMMAND As Int32 = &H111
        Const WM_USER As Int32 = &H400
        Const OCM__BASE As Int32 = WM_USER + &H1C00
        Const OCM_COMMAND As Int32 = OCM__BASE + WM_COMMAND

        If m.Msg = OCM_COMMAND Then
            Dim CbAction As Int32 = (m.WParam.ToInt32 >> 16)    ' combobox
action
            Select Case CbAction
                Case CBN_SELCHANGE
                    PostMessage(Me.Handle.ToInt32, OCM_COMMAND,
CBN_EDITCHANGE << 16, 0)
                Case CBN_EDITCHANGE
                Case CBN_CLOSEUP
                Case CBN_SELENDOK
            End Select
        End If
End Sub

Show quote Hide quote I didn't check the code (if there's a .Net way to do it) but the declaration
is for previous VB versions. Use this one instead:

Private Declare Function PostMessage Lib "user32" Alias
"PostMessageA" _
        (ByVal hwnd As intptr, _
        ByVal wMsg As integer, _
        ByVal wParam As integer, _
        ByVal lParam As integer) As boolean



Armin

Searching the 'net, my declaration is correct VB .NET.  All the params need
to be declared as Long not Integer.  I still need help getting the parameter
values.

Show quoteHide quote

No.

You may also declare wparam and lparam as IntPtr. See
System.Windows.Forms.Message.


Armin

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