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
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