form1.frm

本文件包含200个visual baisc实例

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "撤消上次操作"
   ClientHeight    =   2190
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   3870
   LinkTopic       =   "Form1"
   ScaleHeight     =   2190
   ScaleWidth      =   3870
   StartUpPosition =   1  '所有者中心
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      Height          =   420
      Left            =   2025
      TabIndex        =   2
      Top             =   1710
      Width           =   1275
   End
   Begin VB.TextBox Text1 
      Height          =   1560
      Left            =   75
      TabIndex        =   1
      Text            =   "Text1"
      Top             =   60
      Width           =   3720
   End
   Begin VB.CommandButton Command1 
      Caption         =   "撤消"
      Height          =   420
      Left            =   555
      TabIndex        =   0
      Top             =   1710
      Width           =   1275
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
'函数声明
Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any) As Long
Const MY_USER = &H400
Const My_UNDO = MY_USER + 23
Private Sub Form_Load()
  Text1.Text = "  你是风儿，我是沙"
End Sub
Private Sub Command1_Click()
  Dim myval
  myval = SendMessage(Text1.hwnd, My_UNDO, 0, 0)
End Sub
Private Sub Command2_Click()
  End
End Sub