如何实现用户事件

lang 2000-05-14 06:40:00
在VB中如何能够实现用户自己定义的事件,象PB中用户事件一样
请发邮箱langjinwen@yeah.net,多谢!!!!
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iwin 2000-05-18
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1,在新建类中用Event语句声明用户自定义事件,用RaiseEvent语句触发事件。
2,在需要接收事件的类中,用WithEvents声明一个变量为上面的新建类,即可在代码窗口对事件编程。
jing 2000-05-17
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Private Sub Form_Load()
Dim ret As Long
hMenu = GetMenu(Me.hwnd)

'记录原本的Window Procedure的位址
preWinProc = GetWindowLong(Me.hwnd, GWL_WNDPROC)
'设定Combo1的window Procedure到wndproc
ret = SetWindowLong(Me.hwnd, GWL_WNDPROC, AddressOf wndproc)
End Sub

Private Sub Form_Unload(Cancel As Integer)
Dim ret As Long
'取消Message的截取,而使之又只送往原来的Window Procedure
ret = SetWindowLong(Me.hwnd, GWL_WNDPROC, preWinProc)
End Sub


'以下在.Bas
'以下程式在module1.bas
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _
(ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
(ByVal hwnd As Long, ByVal nIndex As Long) As Long
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
Declare Function GetMenuString Lib "user32" Alias "GetMenuStringA" (ByVal hMenu As Long, ByVal wIDItem As Long, ByVal lpString As String, ByVal nMaxCount As Long, ByVal wFlag As Long) As Long
Declare Function GetMenu Lib "user32" (ByVal hwnd As Long) As Long
Declare Function GetSubMenu Lib "user32" (ByVal hMenu As Long, ByVal nPos As Long) As Long

Public Const GWL_WNDPROC = (-4)
Public Const WM_MENUSELECT = &H11F
Public Const MF_BYCOMMAND = &H0&
Public Const MF_BYPOSITION = &H400&

Public hMenu As Long
Public preWinProc As Long
Private Type tLong
ll As Long
End Type
Private Type TwoWord
LowWord As Integer
HiWord As Integer
End Type
Public Function wndproc(ByVal hwnd As Long, ByVal Msg As Long, _
ByVal wParam As Long, ByVal lParam As Long) As Long
Dim MenuItemStr As String, SubMenuStr As String
Dim hSubmenu As Long, MenuId As Long, i As Long
Dim tmpl As tLong, tmpt As TwoWord
'以下程式会截取WM_MENUSELECT处理完後,再将之送往原来的Window Procedure
If Msg = WM_MENUSELECT Then
SubMenuStr = String(255, 0)
MenuItemStr = String(255, 0)

tmpl.ll = wParam
LSet tmpt = tmpl
MenuId = tmpt.LowWord

hSubmenu = GetSubMenu(lParam, MenuId)
If hSubmenu = 0 Then '表示该item之下没有popupMenu了
Call GetMenuString(lParam, MenuId, MenuItemStr, 256, MF_BYCOMMAND)
MenuItemStr = Left(MenuItemStr, InStr(1, MenuItemStr, Chr(0)) - 1)
Debug.Print "正在 MenuItem " + MenuItemStr
Else
Call GetMenuString(hMenu, hSubmenu, SubMenuStr, 256, MF_BYCOMMAND)
SubMenuStr = Left(SubMenuStr, InStr(1, SubMenuStr, Chr(0)) - 1)
Debug.Print "正在 PopUpMenu " + SubMenuStr
End If
End If
'将之送往原来的Window Procedure
wndproc = CallWindowProc(preWinProc, hwnd, Msg, wParam, lParam)
End Function
jing 2000-05-17
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SetWindowLong 一定能做
008 2000-05-17
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没错

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