vb.net多线程传参数,c多线程传递参数

vb.net 如何传递类参数

线程结束后利用委托生成事件返回，线程应用包括传入和传出参数。

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Public Delegate Sub ThreadCallback(value As ThreadResult)

Public Class Form1

Private WithEvents _th_1 As Thread_1

Protected Overrides Sub OnLoad(e As System.EventArgs)

Dim value As ThreadObject

value.Index = 1

Me._th_1 = New Thread_1(Me)

Me._th_1.Run(value)

MyBase.OnLoad(e)

End Sub

Private Sub Thread_1_End(sender As Object, e As ThreadEventArgs) Handles _th_1.ThreadEnd

Me.TextBox1.Text = e.Result.Text

End Sub

End Class

Public Class Thread_1

Public Event ThreadEnd(sender As Object, e As ThreadEventArgs)

Private _control As Control

Sub New(control As Control)

Me._control = control

End Sub

Public Sub Run(value As Object)

Dim th As New Threading.Thread(AddressOf ThreadProc)

th.Start(value)

End Sub

Private Sub ThreadProc(obj As Object)

Dim value As ThreadObject = CType(obj, ThreadObject)

Dim result As ThreadResult = Nothing

If value.Index = 1 Then result.Text = "测试"

Dim callback As New ThreadCallback(AddressOf ThreadInvoke)

_control.Invoke(callback, result)

End Sub

Private Sub ThreadInvoke(value As ThreadResult)

RaiseEvent ThreadEnd(Me, New ThreadEventArgs(value))

End Sub

End Class

Public Structure ThreadObject

Public Index As Integer

'Public Rect As Rectangle

End Structure

Public Structure ThreadResult

Public Text As String

'Public Rect As Rectangle

End Structure

Public Class ThreadEventArgs

Inherits System.EventArgs

Private _result As ThreadResult

Public ReadOnly Property Result As ThreadResult

Get

Return _result

End Get

End Property

Sub New(value As ThreadResult)

Me._result = value

End Sub

End Class

vb.net 多线程获取网页内容

public static string getXmlFile(String url, String paramList,string referer)

{

HttpWebResponse res = null;

string strResult = " ";

try

{

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

req.Method = "GET ";

req.KeepAlive = true;

req.Referer=referer;

//CookieContainer cookieCon = new CookieContainer();

//req.CookieContainer = cookieCon;

//req.CookieContainer.SetCookies(new Uri(url),cookieheader);

StringBuilder UrlEncoded = new StringBuilder();

res = (HttpWebResponse)req.GetResponse();

Stream ReceiveStream = res.GetResponseStream();

Encoding encode = System.Text.Encoding.GetEncoding( "gb2312 ");

StreamReader sr = new StreamReader( ReceiveStream, encode );

Char[] read = new Char[256];

int count = sr.Read( read, 0, 256 );

while (count 0)

{

String str = new String(read, 0, count);

strResult += str;

count = sr.Read(read, 0, 256);

}

}

catch(Exception e)

{

strResult = e.ToString();

}

finally

{

if ( res != null )

{

res.Close();

}

}

return strResult;

}

多线程里调用就行了 费了好长时间才弄出来 我调试过了 能行 如果对你有用就给分吧

什么是多线程技术？在VB 中如何使用？

vb6可以实现多线程,不过比较麻烦,vb.net完全支持多线程,请参见msdn.

至于vb6实现多线程请看CreateThread这个API函数.以下有详细方案:

用VB写多线程程序用到的第一个API函数是CreateThread，这个函数的声明如下：

Private Declare Function CreateThread Lib "kernel32" (ByVal lpThreadAttributes As Any, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, lpParameter As Any, ByVal dwCreationFlags As Long, lpThreadId As Long)As Long

这个函数的返回值是线程的句柄，它的参数含义如下：

1.lpThreadAttributes：这个参数表明函数的返回句柄是否可被子进程继承，如果可被继承，则指向一个SECURITY_ATTRIBUTES的结构，否则设为vbnull。

2.dwStackSize：这个参数设置线程的堆栈大小。

3.lpStartAddress：这个参数指明这个线程函数的起始地址。

4.lpParameter：这个参数是传给线程函数的参数。

5.dwCreationFlags：这个参数设置当线程创建时的初始状态，挂起，运行等等。

6.lpThreadId：这个参数是待创建线程的ID号。

假设创建一个管理线程的类clsThreads，用类的一个公用函数Initialize来初始化线程，用ResumeThread和SuspendThread函数来激活线程，实现代码如下：

Private Type udtThread

Handle As Long

Enabled As Boolean

End Type

Private uThread As udtThread

Private Const CREATE_SUSPENDED As Long = H4

Private Declare Function CreateThread Lib "kernel32" (ByVal lpThreadAttributes As Any, ByVal dwStackSize As Long, ByVal lpStartAddress As Long, lpParameter As Any, ByVal dwCreationFlags As Long, lpThreadId As Long) As Long

Private Declare Function ResumeThread Lib "kernel32" (ByVal hThread As Long) As Long

Private Declare Function SuspendThread Lib "kernel32" (ByVal hThread As Long) As Long

Private Declare Function TerminateThread Lib "kernel32" (ByVal hThread As Long, ByVal dwExitCode As Long) As Long

Public Sub Initialize(ByVal lpfnBasFunc As Long) '初始化线程

Dim lStackSize As Long, lCreationFlags As Long, lpThreadId As Long, lNull As Long

On Error Resume Next

lNull = 0 '创建一个空指针

lStackSize = 0 '0表示用exe的stack size

lCreationFlags = CREATE_SUSPENDED '表示初始化后先不激活，让别人来激活

uThread.Handle = CreateThread(lNull, lStackSize, lpfnBasFunc, lNull, lCreationFlags, lpThreadId)

If uThread.Handle = lNull Then MsgBox "Create thread failed!"

End Sub

Public Property Get Enabled() As Boolean

On Error Resume Next

Enabled = uThread.Enabled

End Property

Public Property Let Enabled(ByVal vNewValue As Boolean)

On Error Resume Next

If vNewValue And (Not uThread.Enabled) Then

ResumeThread uThread.Handle '激活线程

uThread.Enabled = True

ElseIf uThread.Enabled Then

SuspendThread uThread.Handle

uThread.Enabled = False

End If

End Property

Private Sub Class_Terminate() '终止线程

On Error Resume Next

Call TerminateThread(uThread.Handle, 0)

End Sub

以上内容在类模块clsThreads中，有了它就可以在窗体中实现多线程了。下面以一个简单的例子来说明如何创建多线程(以2个线程为例)。

在form1中添加picture1和picture2两个图片框，以及一个command1按钮，在工程中添加一个bas模块，该模块的代码如下：

Option Explicit

Private Declare Function GetTickCount Lib "kernel32" () As Long

Public Sub FlickerTop()

Static BgColor As Long

Dim lTick As Long, lCounter As Long

On Error Resume Next

For lCounter = 0 To 60000

BgColor = lCounter Mod 256

Form1.Picture1.BackColor = RGB(BgColor, 0, 0) '变化图片框的颜色

lTick = GetTickCount

While GetTickCount - lTick 10 '延迟10个毫秒时间

Wend

Next

End Sub

Public Sub FlickerBottom()

Static BgColor As Long

Dim lTick As Long, lCounter As Long

On Error Resume Next

For lCounter = 0 To 60000

BgColor = lCounter Mod 256

Form1.Picture2.BackColor = RGB(0, BgColor, 0)

lTick = GetTickCount

While GetTickCount - lTick 10

Wend

Next

End Sub

最后在form1中用下面的代码来创建两个线程，

Option Explicit

Public myThreadTop As New clsThreads, myThreadBottom As New clsThreads

Private Sub Command1_Click()

On Error Resume Next

With myThreadTop

.Initialize AddressOf FlickerTop

.Enabled = True

End With

With myThreadBottom

.Initialize AddressOf FlickerBottom

.Enabled = True

End With

MsgBox "看看会有什么..."

Set myThreadTop = Nothing

Set myThreadBottom = Nothing

End Sub

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.net 怎样操作带参数的多线程

public class threadclass

{

public int a;

public void threadmethod()

{

//use a;

}

}

...

threadclass tc = new ....

tc.a = 10;

Thread t = new ThreadStart(tc.threadmethod);

t.Start

Vb.net 怎样操作有参数的多线程而且还是循环的。

Sub Main()

Dim thr As New Thread(AddressOf 循环)

thr.Start("a")

End Sub

Sub 循环(a() As String)

'这里随你干什么循环也行

For Each i As String In a

MsgBox(i)

Next

End Sub

看懂了吧 参数只能有一个 也可以不是数组，在a() As String的a后面去掉括号就行