SetWindowSub类正在泄漏用户对象

我在用 Bear

Safer subclassing

这是VB6代码

'--- Form1.frm '
Option Explicit

Private Declare Function SetWindowSubclass Lib "comctl32" (ByVal hwnd As Long, ByVal pfnSubclass As Long, ByVal uIdSubclass As Long, ByVal dwRefData As Long) As Long
Private Declare Function DefSubclassProc Lib "comctl32" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Private Declare Function RemoveWindowSubclass Lib "comctl32" (ByVal hwnd As Long, ByVal pfnSubclass As Long, ByVal uIdSubclass As Long) As Long

Private Sub Command1_Click()
    Call SetWindowSubclass(hwnd, AddressOf RedirectTabPaneEditWndProc, 10, ObjPtr(Me))
End Sub

Private Sub Command2_Click()
    Call RemoveWindowSubclass(hwnd, AddressOf RedirectTabPaneEditWndProc, 10)
End Sub

Friend Function frWndProc(ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
    frWndProc = DefSubclassProc(hwnd, wMsg, wParam, lParam)
End Function

'--- Module1.bas '
Option Explicit

Public Function RedirectTabPaneEditWndProc( _
            ByVal hwnd As Long, _
            ByVal wMsg As Long, _
            ByVal wParam As Long, _
            ByVal lParam As Long, _
            ByVal uIdSubclass As Long, _
            ByVal This As Form1) As Long
    #If uIdSubclass Then '--- touch args
    #End If
    RedirectTabPaneEditWndProc = This.frWndProc(hwnd, wMsg, wParam, lParam)
End Function

如果您正在使用SetWindowSubclass API进行密集的子类化,请警告其他任何人。

</wqw>