Các chiêu thức trong lập trình Vô hiệu hoá button close và menu của form

“Vô hiệu hoá button close và menu của form (cả Alt-F4 luôn)” home
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Binh khí sử dụng : Chẳng cần gì ta chỉ cần tay không bắt hổ
Đoạn mã :
Private Declare Function DeleteMenu Lib "user32" (ByVal hMenu As Long,
ByVal nPosition As Long, ByVal wFlags As Long) As Long
Private Declare Function GetSystemMenu Lib "user32" (ByVal hwnd As Long,
ByVal bRevert As Long) As Long
Private Const MF_BYPOSITION = &H400&
Private ReadyToClose As Boolean
Private Sub RemoveMenus(frm As Form, _
remove_restore As Boolean, _
remove_move As Boolean, _
remove_size As Boolean, _
remove_minimize As Boolean, _
remove_maximize As Boolean, _
remove_seperator As Boolean, _
remove_close As Boolean)
Dim hMenu As Long
hMenu = GetSystemMenu(hwnd, False)
If remove_close Then DeleteMenu hMenu, 6, MF_BYPOSITION
If remove_seperator Then DeleteMenu hMenu, 5, MF_BYPOSITION
If remove_maximize Then DeleteMenu hMenu, 4, MF_BYPOSITION
If remove_minimize Then DeleteMenu hMenu, 3, MF_BYPOSITION
If remove_size Then DeleteMenu hMenu, 2, MF_BYPOSITION
If remove_move Then DeleteMenu hMenu, 1, MF_BYPOSITION
If remove_restore Then DeleteMenu hMenu, 0, MF_BYPOSITION
End Sub
Private Sub cmdClose_Click()
ReadyToClose = True
Unload Me

End Sub
Private Sub Form_Load()
RemoveMenus Me, False, False, _
False, False, False, True, True
End Sub
Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
Cancel = Not ReadyToClose
End Sub