vb.net多进程 windows多进程编程

VB.net 如何设计多线程运行

Sub Main()

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Dim thr As Thread

For Pi As Integer=0 To 4 //启用5线程

MulParams =Pi vbTab sFile vbTab dFile vbTab 1 vbTab DelN vbTab cr vbTab cg vbTab cb vbTab IndexI

GlobalParamas(pi)=MulParams .Split(vbTab)

thr=New Thread(AddressOf MyMulThreadCaller)

thr.Start() //启动多线程进程

Application.DoEvents

Next

End Sub

vbnet同时执行多个任务

题主是否想询问“vbnet同时执行多个任务怎么实现”？多线程操作。vbnet同时执行多个任务通过多线程操作实现，Visual Basic.net，属于计算机软件领域，是计算机中实现网络功能的编程语言。

VB.NET 简单多线程

多线程一般是不推荐用的，因为线程之间如果有共享资源的话会引起竞争，需要加锁处理；而且线程间没有时序关系，所以你在调试中可能会出现异步处理结束顺序与开始处理顺序不一致的情况（我在调试中已经发现该问题）。

针对你提出的这个问题，采用了多线程处理，利用的是BackgroundWorker也就是异步处理控件进行了处理。

代码已经经过调试通过。欢迎交流，如有问题，留下QQ或其他联系方式。

代码如下，并附程序截图。

‘---------------------------------------------------

Imports System.ComponentModel '导入异步控件命名空间

Public Class Form1

Private howmany As Integer = 10

Private AnalysisNumber(0 To howmany - 1) As BackgroundWorker

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

ListBox1.Items.Clear()

creatNewBackgroundWorker()

addHandle()

startWork()

End Sub

Private Sub creatNewBackgroundWorker()

For i As Integer = 0 To AnalysisNumber.Length - 1

AnalysisNumber(i) = New BackgroundWorker

Next

End Sub

Private Sub addHandle()

For i As Integer = 0 To AnalysisNumber.Length - 1

AddHandler AnalysisNumber(i).DoWork, AddressOf AnalysisNumber_DoWork

AddHandler AnalysisNumber(i).RunWorkerCompleted, AddressOf AnalysisNumber_RunWorkerCompleted

Next

End Sub

Private Sub startWork()

For i As Integer = 0 To 9

Dim temp(0 To 9) As Integer

For j As Integer = 1 To 10

temp(j - 1) = 10 * i + j

Next

AnalysisNumber(i).RunWorkerAsync(temp)

Next

End Sub

Private Sub AnalysisNumber_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs)

Dim data As Integer()

data = CType(e.Argument, Integer())

Dim temp As Integer

For i As Integer = 0 To data.Length - 1

temp = data(i)

data(i) = temp * temp

Next

e.Result = data

End Sub

Private Sub AnalysisNumber_RunWorkerCompleted(ByVal sender As Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs)

Dim data As Integer()

data = CType(e.Result, Integer())

For i As Integer = 0 To data.Length - 1

ListBox1.Items.Add(data(i))

Next

End Sub

End Class

Vb 多进程技术

调用 2.exe 用 shell 方法就可以了.不用多说.

至于检测 5个 2.exe 是否全都结束的方法,可以在 1.exe 中添加1个TIMER ,设定每隔1秒遍历系统进程表.]

找出系统进程中 2.exe 的个数,若为 0个 则显示"处理完成"

遍历进程需要调用API：

Declare Function CreateToolhelpSnapshot Lib "kernel32" Alias "CreateToolhelp32Snapshot" (ByVal lFlags As Long, ByVal lProcessID As Long) As Long

Declare Function ProcessFirst Lib "kernel32" Alias "Process32First" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long

Declare Function ProcessNext Lib "kernel32" Alias "Process32Next" (ByVal hSnapShot As Long, uProcess As PROCESSENTRY32) As Long

Declare Function TerminateProcess Lib "kernel32" (ByVal hProcess As Long, ByVal uExitCode As Long) As Long

Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long

Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long

Public Declare Function ShellExecute Lib "shell32.dll" Alias "ShellExecuteA" (ByVal hwnd As Long, ByVal lpOperation As String, ByVal lpFile As String, ByVal lpParameters As String, ByVal lpDirectory As String, ByVal nShowCmd As Long) As Long

Const MAX_PATH As Integer = 260

Type PROCESSENTRY32

dwSize As Long

cntUsage As Long

th32ProcessID As Long

th32DefaultHeapID As Long

th32ModuleID As Long

cntThreads As Long

th32ParentProcessID As Long

pcPriClassBase As Long

dwFlags As Long

szExeFile As String * MAX_PATH

End Type

Const TH32CS_SNAPheaplist = H1

Const TH32CS_SNAPPROCESS = H2

Const TH32CS_SNAPthread = H4

Const TH32CS_SNAPmodule = H8

Public Const TH32CS_SNAPall = TH32CS_SNAPPROCESS + TH32CS_SNAPheaplist + TH32CS_SNAPthread + TH32CS_SNAPmodule

'下面的"GetCount" 函数用于返回 2.exe 的个数:

Public Function GetCount()

Dim i As Long, lPid As Long

Dim k As Long

Dim Proc As PROCESSENTRY32

Dim hSnapShot As Long

hSnapShot = CreateToolhelpSnapshot(TH32CS_SNAPall, 0) '获得进程“快照”的句柄

Proc.dwSize = Len(Proc)

lPid = ProcessFirst(hSnapShot, Proc) '获取第一个进程的PROCESSENTRY32结构信息数据

i = 0

k = 0

Do While lPid 0

If InStr(1, Proc.szExeFile, "2.exe", vbTextCompare) 0 Then

k = k + 1

End If

i = i + 1

lPid = ProcessNext(hSnapShot, Proc) '循环获取下一个进程的PROCESSENTRY32结构信息数据

Loop

CloseHandle hSnapShot '关闭进程“快照”句柄

IsDone = k

End Function