err1.frm

上传的包含两个文件

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3195
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3195
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command1 
      Caption         =   "comopen"
      Height          =   735
      Left            =   960
      TabIndex        =   0
      Top             =   1440
      Width           =   975
   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()
Dim a As Integer
On Error GoTo errhandle
Open "a:\myfile.txt" For Output As #1
Write #1, "错误处理程序测试"
Close #1
Exit Sub
errhandle:
   If Err.Number = 71 Then
     a = MsgBox("请在A中插入软盘后重试！", 37, "磁盘未准备好")
   If a = 4 Then Resume
   End If
End Sub