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         =   "改变下拉列表框的宽度"
   ClientHeight    =   2730
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   2730
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "退出"
      Height          =   495
      Left            =   1200
      TabIndex        =   1
      Top             =   1560
      Width           =   1215
   End
   Begin VB.ComboBox Combo1 
      Height          =   300
      Left            =   600
      TabIndex        =   0
      Text            =   "Combo1"
      Top             =   240
      Width           =   2055
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
    Unload Me
End Sub

Sub Form_Load()
    Dim ret As Long
    Combo1.AddItem "照猫画虎"
    Combo1.AddItem "http://zmhh.mycool.net"
    '设定ComboBox宽度为150 Pixel。
    setwidth = 150
    '记录原本的Window Procedure的位址。
    preWinProc = GetWindowLong(Combo1.hwnd, GWL_WNDPROC)
    '设定Combo1的window Procedure到wndproc。
    ret = SetWindowLong(Combo1.hwnd, GWL_WNDPROC, AddressOf wndproc)
End Sub

 Private Sub Form_Unload(Cancel As Integer)
    Dim ret As Long
    '取消Message的截取，恢复原来的Window Procedure。
    ret = SetWindowLong(Combo1.hwnd, GWL_WNDPROC, preWinProc)
    Set Form1 = Nothing
 End Sub