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Posted by JiaJia 5 March,2009 (0)Comment
¡¡¡¡ÓÃAPIº¯Êý SetWindowLong Ö¸¶¨´¦ÀíÏûÏ¢µÄ´°¿Ú¹ý³ÌΪ×Ô¶¨ÒåµÄº¯Êý WindowProc£¬²¶»ñÏûÏ¢IDΪ WM_USER+1 µÄ×Ô¶¨ÒåÏûÏ¢»òϵͳÏûÏ¢¡£²¢ÇÒ£¬ÎªÁ˱£Ö¤´°¿ÚÄÜÕýÈ·µÄÏìÓ¦ÏûÏ¢£¬ÐèÒª±£´æÔ­À´Ä¬ÈϵĴ°¿Ú¹ý³Ì²¢ÔÚ×Ô¶¨Ò庯ÊýWindowProcÖе÷Óá£ÈçÏÂÀý£¬ÔÚ°´Å¥Ê¼þÖз¢ËÍ×Ô¶¨ÒåÏûÏ¢£¬WindowProc ²¶»ñÁË´°¿Ú´óС±ä»¯µÄϵͳ¶¨ÒåÏûÏ¢ºÍÓû§×Ô¶¨ÒåµÄÏûÏ¢²¢ÏÔʾÓû§×Ô¶¨ÒåµÄÏûÏ¢²ÎÊý wParam¡£
Form ²¿·Ö´úÂë
Private Sub Command1_Click()
Dim wParam As Long
Dim lParam As Long
Dim lResult As Long
¡¡wParam = 12345
¡¡lResult = SendMessage(Me.hwnd, WM_USER + 1, wParam, lParam)
End Sub
Private Sub Form_Load()
¡¡Me.Tag = Hook(Me.hwnd)
End Sub
Private Sub Form_Unload(Cancel As Integer)
¡¡Unhook Me.hwnd, Me.Tag
End Sub
Mod ²¿·Ö´úÂë
Option Explicit
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
Public Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _
(ByVal hwnd As Long, ByVal nIndex As Long) As Long
Private Declare Function SetWindowLong Lib "user32" Alias _
"SetWindowLongA" (ByVal hwnd As Long, _
ByVal nIndex As Long, ByVal dwNewLong As Long) As Long
Public Declare Function SendMessage Lib "user32" Alias _
"SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, _
ByVal wParam As Long, lParam As Any) As Long
Private Const GWL_WNDPROC = -4
Public Const GWL_USERDATA = (-21)
Public Const WM_SIZE = &H5
Public Const WM_USER = &H400
Public Function Hook(ByVal hwnd As Long) As Long
¡¡Dim pOld As Long
'Ö¸¶¨×Ô¶¨ÒåµÄ´°¿Ú¹ý³Ì
¡¡pOld = SetWindowLong(hwnd, GWL_WNDPROC, AddressOf WindowProc)
'±£´æÔ­À´Ä¬ÈϵĴ°¿Ú¹ý³ÌÖ¸Õë
¡¡SetWindowLong hwnd, GWL_USERDATA, pOld
¡¡Hook = pOld
End Function
Public Sub Unhook(ByVal hwnd As Long, ByVal lpWndProc As Long)
¡¡Dim temp As Long
¡¡'×¢ÊÍ£ºCease subclassing.
¡¡temp = SetWindowLong(hwnd, GWL_WNDP


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Option Explicit
Private Type BROWSEINFO
hOwner As Long
pidlRoot As Long
pDisplayName As String
lpTitle As String
ulFlags As Long
lpfn As Long
lParam As Long
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End Type
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