disable MDI form minimize button

Posted on 2001-06-08
Last Modified: 2012-05-04
How i can disable or invisible the Minimize button of a MDIform?
Question by:ahmadpj
LVL 27

Accepted Solution

Ark earned 5 total points
ID: 6170325
Private Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd&, ByVal nIndex&) As Long
Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd&, ByVal nIndex&, ByVal dwNewLong&) As Long
Const GWL_STYLE As Long = (-16&)
Private Const WS_MINIMIZEBOX = &H20000

Private Sub MDIForm_Load()
   SetWindowLong Me.hWnd, GWL_STYLE, GetWindowLong(Me.hWnd, GWL_STYLE) Xor WS_MINIMIZEBOX
End Sub

Expert Comment

ID: 6170329
Private Declare Function GetSystemMenu Lib "User32" (ByVal hWnd As Long, ByVal bRevert As Long) As Long
Private Declare Function RemoveMenu Lib "User32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long

hSysMenu = GetSystemMenu(Me.hWnd, 0)
Call RemoveMenu(hSysMenu, 1, &H400&)
Call RemoveMenu(hSysMenu, 2, &H400&)
Call RemoveMenu(hSysMenu, 3, &H400&)
Call RemoveMenu(hSysMenu, 4, &H400&)


Expert Comment

ID: 6170362
Each form has system menu. It occurs at click mouse on icon in the left upper corner of the form.
Its units:
- Restore
- Move
- Size
- Minimize
- Maximize
- (separator)
- Close
In an example the first 5 menu items are deleted.

-------------------------------Module1 -------------------------------------------
Declare Function GetSystemMenu Lib "user32" (ByVal hwnd As Long, ByVal bRevert As Long) As Long
Declare Function GetMenuItemCount Lib "user32" (ByVal hMenu As Long) As Long
Declare Function RemoveMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, _
    ByVal wFlags As Long) As Long
Declare Function DrawMenuBar Lib "user32" (ByVal hwnd As Long) As Long
Const MF_BYPOSITION = &H400&
Const MF_REMOVE = &H1000&

Public Sub DisableMaxMin(ByVal Form_hWnd As Long)
    Dim hMenu As Long
    Dim nCount As Long
    Dim i as Long

    hMenu = Module1.GetSystemMenu(Form_hWnd, 0)
    nCount = Module1.GetMenuItemCount(hMenu)
    For i=1 To 5
        Module1.RemoveMenu hMenu, 1, Module1.MF_REMOVE Or Module1.MF_BYPOSITION
    Next i
    Module1.DrawMenuBar Form_hWnd
End Sub

Sub main()
End Sub
------------------------------- end Module1 ------------------------------------

------------------------------- MDIForm1 ----------------------------------------
Private Sub MDIForm_Load()
     Module1.DisableMaxMin Me.hwnd
End Sub
------------------------------- end MDIForm1-----------------------------------
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Author Comment

ID: 6170391
Thank u all, i used Ark code, and it works, but i have a question from Ark, how u find out the value of WS_MINIMIZEBOX, i asked it cuz i want it for WS_MAXIMIZEBOX
LVL 27

Expert Comment

ID: 6170400
Private Const WS_MAXIMIZEBOX = &H10000

Author Comment

ID: 6170413
Yes i know it is &H10000 but how we can find it?

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