判断combobox控件列表被收起.bas

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Attribute VB_Name = "Module1"
Option Explicit

Public Const GWL_WNDPROC = (-4)
Public Const CBN_CLOSEUP = 8
Public Const WM_COMMAND = &H111

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 GetWindowLong Lib "user32" Alias "GetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long) As Long
Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" (ByVal hWnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As Long

Public prevWndProc As Long

Function WndProc(ByVal hWnd As Long, ByVal Msg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long

    If Msg = WM_COMMAND And wParam \ 65536 = CBN_CLOSEUP Then
        If lParam = Form1.Combo1.hWnd Then
            Form1.List1.AddItem "Combo1被收起来了"
        ElseIf lParam = Form1.Combo2.hWnd Then
            Form1.List1.AddItem "Combo2被收起来了"
        End If
    End If
    
    WndProc = CallWindowProc(prevWndProc, hWnd, Msg, wParam, lParam)
End Function