將About加入窗口的系統菜單

如果能把關於軟件的一些信息（About Me）加入窗口的系統菜單是不是很酷啊！
其實這是個很簡單的操作，Let's go！

1.添加一個模塊（SubClass）
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Option Explicit
'有關係統菜單的API
Public Declare Function GetSystemMenu Lib "user32" (ByVal hWnd As Long, ByVal bRevert As Long) As Long
Public Declare Function InsertMenu Lib "user32" Alias "InsertMenuA" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long, ByVal wIDNewItem As Long, ByVal lpNewItem As Any) As Long

Public Const MF_BYCOMMAND = &H0&
Public Const MF_BYPOSITION = &H400&
Public Const MF_STRING = &H0&
Public Const MF_SEPARATOR = &H800&

'有關窗口的消息處理的API
Private Declare Function SetWindowLong Lib "user32" Alias _
        "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex _
        As Long, ByVal dwNewLong As Long) As Long
       
Private Declare Function CallWindowProc Lib "user32" Alias _
        "CallWindowProcA" (ByVal lpPrevWndFunc As Long, ByVal _
        hWnd As Long, ByVal Msg As Long, ByVal wParam As _
        Long, ByVal lParam As Long) As Long
       
Const GWL_WNDPROC = (-4&)
Const WM_SYSCOMMAND = &H112
Const WM_DESTROY = &H2

Dim PrevWndProc&

Public Sub Init(hWnd As Long)
  PrevWndProc = SetWindowLong(hWnd, GWL_WNDPROC, AddressOf SubWndProc)
End Sub

Public Sub Terminate(hWnd As Long)
  Call SetWindowLong(hWnd, GWL_WNDPROC, PrevWndProc)
End Sub

Private Function SubWndProc(ByVal hWnd As Long, ByVal Msg As Long, _
                            ByVal wParam As Long, ByVal lParam As Long) _
                            As Long
 
  If Msg = WM_DESTROY Then Terminate (Form1.hWnd)
 
  If Msg = WM_SYSCOMMAND Then
     If wParam = 2002 Then
        MsgBox "我是40Star", vbInformation, "hia..hia..."
     End If
  End If
 
  SubWndProc = CallWindowProc(PrevWndProc, hWnd, Msg, wParam, lParam)
End Function

2.在窗口的load事件中加入
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Private Sub Form_Load()
   InsertMenu GetSystemMenu(Me.hWnd, False), 0, MF_BYPOSITION Or MF_SEPARATOR, 2001, "" '加入一條分割線
   InsertMenu GetSystemMenu(Me.hWnd, False), 0, MF_BYPOSITION Or MF_STRING, 2002, "About Me(&A)"  '加入About me菜單在系統菜單中
   Call Init(Me.hWnd)
End Sub

3.在窗口的Unload事件中加入
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Private Sub Form_Unload(Cancel As Integer)
   Call Terminate(Me.hWnd)
End Sub

 

OK啦！運行一下吧，是不是很好玩                  ：）
在Win2000 + Vb6中調試通過

Good Luck