[RESOLVED] Windows Messages - Mouse Forward & Backward buttons

Anyone know what Windows Messages are for the forward and backward mouse buttons, for example I know how to get the mouse wheel...

Code:

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    If Msg = WM_MOUSEWHEEL Then
        Rotation = wParam / 65536
    End If

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... but not sure what the code would be for forward and backward buttons (on mouse button up),

So far I've got this but not sure its correct or not. ?

Code:

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    If Msg = 524 Then '&H20C
        If wParam = 131072 Then '&H20000
            ForwardButtonUp = True
        ElseIf wParam = 65536 Then '&H10000
            BackwardButtonUp = True
        End If
    End If

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Here's a nice collection of mouse related messages:

Code:

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Private Const WM_MOUSEWHEEL = &H20A
Private Const WM_MOUSEACTIVATE As Integer = &H21
Private Const WM_MOUSEMOVE As Integer = &H200

Private Const WM_LBUTTONDOWN As Integer = &H201
Private Const WM_LBUTTONUP As Integer = &H202
Private Const WM_LBUTTONDBLCLK As Integer = &H203

Private Const WM_RBUTTONDOWN As Integer = &H204
Private Const WM_RBUTTONUP As Integer = &H205
Private Const WM_RBUTTONDBLCLK As Integer = &H206

Private Const WM_MBUTTONDOWN As Integer = &H207
Private Const WM_MBUTTONUP As Integer = &H208
Private Const WM_MBUTTONDBLCLK As Integer = &H209

Private Const WM_XBUTTONDOWN As Integer = &H20B
Private Const WM_XBUTTONUP As Integer = &H20C
Private Const WM_XBUTTONDBLCLK As Integer = &H20D

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The buttons you are interested in fall under "XButton".

Just like with the L/M/R buttons, the value is passed via wParam, eg:

Code:

---

Dim lngMouseButtons As Long

If Msg = WM_XBUTTONUP Then
  lngMouseButtons = wParam And 65535
...
End If

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The value will be one or more of the following:

1 = Left button
2 = Right button
16 = Middle button
32 = 'Back' button
64 = 'Forward' button

Alternatively, you can check wParam / 65536 , which returns 1 (back) or 2 (forward) or 3 (both).

In either case, I would expect the value of any additional buttons (if there are mice with more than 5!) to be double the previous button.

As values can be added together if multiple buttons are pressed, use bit-masking to check for a specific value, eg:

Code:

---

  If lngMouseButtons And 32 Then
    BackwardButtonUp = True
  End If

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Thanks Si, but I must not be following your instructions correctly, for mouse up lngMouseButtons is 0 no matter what button I press in the code below.

Code:

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    If Msg = WM_XBUTTONUP Then
        lngMouseButtons = wParam And 65535
        Debug.Print "Mouse Button Up "; lngMouseButtons ' < Returns 0

        If lngMouseButtons And 32 Then
            Debug.Print "Back button"
        ElseIf lngMouseButtons And 64 Then
            Debug.Print "Forward button"
        End If

    End If

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Ah.. I'd been testing with MouseDown, and it had worked as I said - but after a silly edit by me the IDE crashed, and at that time of night I didn't bother to restart it.

It seems that you only get the current state of the buttons, so using that you'd need a boolean variable per button, to remember the previous state.. however there is another way, which is to check wParam / 65536 as that returns the button which caused the event - 1 for 'back', and 2 for 'forward' (tested properly this time!).

Was skimming thru some MSDN stuff, anyway this seems to work under XP which is all I care about.

Code:

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Private Const XBUTTON1 = &H1
Private Const XBUTTON2 = &H2
'
'

    If Msg = WM_XBUTTONUP Then
        lngMouseButtons = wParam / 65535
        If lngMouseButtons = XBUTTON1 Then
            Debug.Print "Back Up"
        ElseIf lngMouseButtons = XBUTTON2 Then
            Debug.Print "Forward Up"
        End If
    End If
   
    If Msg = WM_XBUTTONDOWN Then
        lngMouseButtons = wParam / 65535
        If lngMouseButtons = XBUTTON1 Then
            Debug.Print "Back Down"
        ElseIf lngMouseButtons = XBUTTON2 Then
            Debug.Print "Forward Down"
        End If
    End If

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