VB怎样判断、防止程序重复执行
Private Sub Form_load()
'判断程序是否已经运行
If App.PrevInstance
Then
MsgBox "本程序已经运行！", vbInformation Or vbOKOnly, "提示信息"
Unload
Me
Exit Sub
End If
'以下是主要程序
' ……
End
Sub
附：另一个例子：
Option Explicit
Public Sub CheckExist(fm
As Form) '防止程序重复执行
Dim title As String
If App.PrevInstance
Then
title = App.title
Call MsgBox("这程序已执行",
vbCritical)
App.title = "" '如此才不会 Avtivate 到自己
fm.Caption =
""
AppActivate title 'activate 先前就已运行的程序
End ' 结束
End
If
End Sub
Private Sub Form_Load()
Call
CheckExist(Me)
End Sub
相关文档：
如何去优化你的VB程序帮助
1、如何去优化你的VB程序
Visual Basic 作为一种高级编程语言，它也有着不可避免的缺点---开发出的应用程序运行速度慢。如果我们能够程序做一些优化，那么情况将会大大改善。要优化程序运行的实际速度，常用的方法有三种：
1.尽量避免使用 Variant 变量。由于VB不能确定 Variant 变量的� ......
http://tieba.baidu.com/f?kz=580219489
http://www.anqn.com/vb/154/8974.shtml
http://www.codefans.net/soft/5089.shtml
http://www.mndsoft.com/blog/article.asp?id=1121
http://topic.csdn.net/t/20020113/14/474848.html
直接运行网页中的JavaScript：
function alllefttab()
WebBrowser1.Document.par ......
'代码:
Option Explicit
'======================用于查找进程和终止进程的API函数常数定义================ =====
Private Declare Function CreateToolhelpSnapshot Lib "kernel32" Alias "CreateToolhelp32Snapshot" (ByVal lFlags As Long, ByVal lProcessID As Long) As Long
Private Declare Function ProcessF ......
Dim wdapp As Word.Application
Dim wddoc As Word.Document
Dim wdtable As Word.Table
Set wdapp = CreateObject("word.application")
Set wddoc = wdapp.Documents.Add
......
代码如下:
Private Declare Function SetWindowPos Lib "user32" (ByVal hwnd As
Long, ByVal hWndInsertAfter As Long,& _
ByVal X As Long, ByVal Y As
Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long & _
&n ......
