form1.frm

这里有很多很实用的VB编程案例,方便大家学习VB.

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "限制下拉列表框右键"
   ClientHeight    =   2820
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4095
   LinkTopic       =   "Form1"
   ScaleHeight     =   2820
   ScaleWidth      =   4095
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "退出"
      Height          =   375
      Left            =   1320
      TabIndex        =   1
      Top             =   1680
      Width           =   1095
   End
   Begin VB.ComboBox Combo1 
      Height          =   300
      Left            =   1200
      TabIndex        =   0
      Text            =   "Combo1"
      Top             =   600
      Width           =   1215
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private hwndcom As Long

Private Sub Command1_Click()
    Unload Me
    End
End Sub

Private Sub Form_Load()
Dim ret As Long
 '取得Combo内EditBox的hwnd
 hwndcom = FindEditInCombo(Combo1)
 '记录原本的Window Procedure的位址
 preWinProc = GetWindowLong(hwndcom, GWL_WNDPROC)
 '设定EditBox的window Procedure到wndproc
 ret = SetWindowLong(hwndcom, 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(hwndcom, GWL_WNDPROC, preWinProc)
End Sub