vb.net多线程爬虫 java多线程爬虫
我用vb.net写了一个爬虫程序,但运行起来,点击所有按钮都没有反应,非得强制关闭,listview控件也得等到
你想一边运行,一边填充数据,我给你出的主意是多线程,用另一个线程来Invoke数据,
我们提供的服务有:网站设计、网站建设、微信公众号开发、网站优化、网站认证、诸城ssl等。为千余家企事业单位解决了网站和推广的问题。提供周到的售前咨询和贴心的售后服务,是有科学管理、有技术的诸城网站制作公司
Thread和线程Timer(不是Form中的Timer),要是同时访问一块数据注意用
SyncLock锁
vb程序设计-网络爬虫
能实现的了,因为现在VB6.0也可以实现多线程。
可以高速的爬取。
在vb.net中,多线程如何使用
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
VB.net 如何设计多线程运行
Sub Main()
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
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
标题名称:vb.net多线程爬虫 java多线程爬虫
本文URL:http://pwwzsj.com/article/dooceip.html