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Tip of the Day
Language: VB5,VB6
Expertise: Intermediate
Mar 11, 2000

WEBINAR:

On-Demand

Application Security Testing: An Integral Part of DevOps


Provide a short description of the menu item being highlighted

Visual Basic lacks of the capability to display a short description of the menu command being highlighted with the mouse or the keyboard, a feature that all professional applications should have. To add menu descriptions to your program, you must subclass the form and trap the WM_MENUSELECT message.

When this message arrives, you must extract the menu ID from the low-word of wParam, and then use it as an argument to the GetMenuString API function to retrieve the caption of the menu. At this point it is pretty easy to provide a short description of the menu command, on a StatusBar or a Label control:


' REQUIRES THE MSGHOOK.DLL COMPONENT

Const WM_MENUSELECT = &H11F
Private Declare Function GetMenuString Lib "user32" Alias "GetMenuStringA" _
    (ByVal hMenu As Long, ByVal wIDItem As Long, ByVal lpString As String, _
    ByVal nMaxCount As Long, ByVal wFlag As Long) As Long

Dim WithEvents FormHook As MsgHook

Private Sub Form_Load()
    ' Start form subclassing 
    Set FormHook = New MsgHook
    FormHook.StartSubclass hWnd
End Sub

Private Sub FormHook_AfterMessage(ByVal uMsg As Long, ByVal wParam As Long, _
    ByVal lParam As Long, retValue As Long)
    If uMsg = WM_MENUSELECT Then
        ' A menu has been selected (but not clicked yet).
        ' The menu item identifier is in the low-order word of wParam.
        ' The menu handle is in lParam
        Dim menuId As Long, menuCaption As String, 
        Dim length As Long, menuDescr As String
        menuId = (wParam And &HFFFF&)
        ' Get the menu caption
        menuCaption = Space$(256)
        length = GetMenuString(lParam, menuId, menuCaption, Len(menuCaption), 0)
        menuCaption = Left$(menuCaption, length)

        ' compare the string with the caption of all menu commands
        Select Case menuCaption
            Case "&New"
                menuDescr = "Create a new file"
            Case "&Open"
                menuDescr = "Open an existing file"
            Case "&Save"
                menuDescr = "Save a file to disk"
            Case "E&xit"
                menuDescr = "Exit the program"
        End Select
        ' display the menu description on a Label control
        lblStatus = menuDescr
    End Select
End Sub

Note that this technique doesn't work with menu items that point to a submenu.
Francesco Balena
 
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