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Visual Basic (Microsoft) Versions 5/6 FAQ

API

How do you change the system menu (on the Control-Menu Box)? by Michael42
Posted: 13 Feb 03

You can turn off the minimize and maximize menu options by changing properties, but what if you're doing something critical in your VB program that should not be interrupted and you need to remove the "close" option?

Make the following declares:

Declare Function GetSystemMenu Lib "User" (ByVal hWnd As Integer, ByVal bRevert As Integer) As Integer
Declare Function RemoveMenu Lib "User" (ByVal hMenu As Integer, ByVal nPosition As Integer, ByVal wFlags As Integer) As Integer

Global Const MF_BYPOSITION=&H400

Use the following in your code to remove the "close" option:

SystemMenu% = GetSystemMenu (hWnd, 0)
Res% = RemoveMenu(SystemMenu%,6, MF_BYPOSITION)
Res% = RemoveMenu(SystemMenu%,6, MF_BYPOSITION) 'also remove the separator line

 Check out the GetMenuID and InsertMenu API functions to do more complicated tasks.

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