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Disabling some items in the system menu of the MDI Child form

Posted on 2002-07-15
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Last Modified: 2008-02-20
Hi,
I need to disable the next (CTRL+F6) that comes up in the system menu of a MDI child form. Hoe do I do it?
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Question by:VCGuru
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Alon Hirsch earned 300 total points
ID: 7153685
I haven't tried this for the 'Next' menu option, but you can :
The easiset way is to remove the menu option from the system menu.

You need the following API declarations :
Private Declare Function RemoveMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long
Private Declare Function GetMenuItemCount Lib "user32" (ByVal hMenu As Long) As Long
Private Declare Function GetSystemMenu Lib "user32" (ByVal hWnd As Long, ByVal bRevert As Long) As Long

and the following constants :
Private Const MF_BYPOSITION = &H400&
Private Const MF_REMOVE = &H1000&

Then, the following code will remove the menu item :
Public Sub RemoveSystemLastItem(frm As Form)
    Dim hMenu As Long
    Dim itemCount As Long
   
    ' get the handle of the system menu
    hMenu = GetSystemMenu(frm.hWnd, 0)
    ' get the number of items in the menu
    itemCount = GetMenuItemCount(hMenu)
    'remove the system menu Close menu item
    RemoveMenu hMenu, itemCount - 1, MF_REMOVE Or MF_BYPOSITION
    'remove the system menu separator line
    RemoveMenu hMenu, itemCount - 2, MF_REMOVE Or MF_BYPOSITION
End Sub

This will physically remove the last item on the system menu as well as the seperator just above it.

I use this code to remove the Close menu option.

HTH,
Alon
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