VB.Net程序设计：多线程处理，搜索局域网的计算机

分类：VB作者：佚名

VB.Net程序设计：多线程处理。

最近要用到多线程程序，来处理一些数据。
在网上找了许多文章。现在会用多线程处理数据了，感觉程序灵活性增强了。
VB.Net-C#多线程Thread-代理委托delegate编程

搜索局域网的计算机

源代码下载地址：http://download.csdn.net/source/1159770


界面：

http://album.hi.csdn.net/app_uploads/linjimu/20090106/162454028.png

1.使用：多线程Thread-代理委托delegate编程来处理。

代码：

Imports System.Net
Imports System.Threading
Public Class FrmLanPC
    Private LanHost As String(,)
    Private thread As Thread()
    Private LocalIPStr As String
    Private Delegate Sub SetTextDelegate(ByVal txt As String)
    Private Delegate Sub SetListViewDelegate(ByVal lv As ListViewItem)
    Private Event FList()
    Private Sub InitLanHost()
        LanHost = New String(254,1) {}
        For i As Integer = 0 To 254
            LanHost(i,0) = ""
            LanHost(i,1) = ""
        Next
    End Sub
    Private Sub SetTextFunc(ByVal str As String)
        Me.TextBox1.Text = str
    End Sub
    Private Sub AddLvFunc(ByVal lv As ListViewItem)
        Me.ListView1.Items.Add(lv)
    End Sub
    'listview1 显示搜索主机 
    Private Sub ListLanHost()
        Dim SetTxtInst As New SetTextDelegate(AddressOf SetTextFunc)
        Me.TextBox1.Invoke(SetTxtInst,LanHost.GetLength(0).ToString)
        Dim AddLvInst As New SetListViewDelegate(AddressOf AddLvFunc)
        Dim lv As ListViewItem
        For i As Integer = 0 To 254
            If LanHost(i,0) <> "" Then
                lv = New ListViewItem()
                lv.Text = LanHost(i,1)
                lv.SubItems.Add(LanHost(i,0))
                ListView1.Invoke(AddLvInst,lv)
            End If
        Next
    End Sub
    Private Sub FrmLanPC_Load(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.Load
        InitLanHost()
        '开始就注册事件
        'AddHandler Me.FList,AddressOf Me.listLanHost
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
        Me.ListView1.Items.Clear()
        Dim th As Thread = New Thread(AddressOf LanSearch)
        th.IsBackground = False
        th.Name = "SearchLanPC"
        th.Start()
        '用下面的语句。要等th执行完毕后才显示。不好。
        'th.Join()
        '这样。就可以在线程运行完毕后，就更新控件数据。
        If th.ThreadState = ThreadState.Stopped Then
            listLanHost()
        End If
    End Sub
    Private Sub LanSearch()
        thread = New Thread(254) {}
        Dim localhost As String = (Dns.GetHostEntry(Dns.GetHostName())).AddressList(0).ToString()
        '本地主机IP地址 
        LocalIPStr = localhost.Substring(0,localhost.LastIndexOf("."))
        Dim threadMethod As ThreadStart
        For i As Integer = 0 To 254
            '建立255个线程扫描IP 
            threadMethod = New ThreadStart(AddressOf LanSearchThreadMethod)
            thread(i) = New Thread(threadMethod)
            thread(i).Name = i.ToString()
            thread(i).Start()
            If Not thread(i).Join(100) Then
                'Thread.Join(100)不知道这处这么用对不对，感觉没什么效果一样 
                thread(i).Abort()
            End If
            '用到委托来更新PrgsBar
            ShowProgress(i)
            Me.TSLab1.Text = String.Format("搜索IP:{0}.{1}",LocalIPStr,i.ToString)
            'Me.TSPrgsBar.Value = i
        Next
        'using  event or thread  to access the serach result
        'RaiseEvent FList()  
        '注意注册事件or用线程
        Dim th As Thread = New Thread(AddressOf ListLanHost)
        th.Start()
    End Sub
    ''' 多线程搜索方法 
    Private Sub LanSearchThreadMethod()
        Dim Currently_i As Integer = Convert.ToInt32(Threading.Thread.CurrentThread.Name.ToString)
        '当前进程名称 
        Dim ScanIP As IPAddress = IPAddress.Parse((LocalIPStr & ".") + Convert.ToString(Currently_i + 1))
        '获得扫描IP地址 
        Dim ScanHost As IPHostEntry = Nothing
        ScanHost = Net.Dns.GetHostEntry(ScanIP)
        '获得扫描IP地址主机信息 
        If ScanHost IsNot Nothing Then
            LanHost(Currently_i,0) = ScanIP.ToString()
            LanHost(Currently_i,1) = ScanHost.HostName
        End If
    End Sub
    Delegate Sub ShowProgressDelegate(ByVal newPos As Integer)
    Private Sub ShowProgress(ByVal newPos As Integer)
        ' 判断是否在线程中访问 
        If Not Me.InvokeRequired Then
            ' 不是的话直接操作控件 
            Me.TSPrgsBar.Value = newPos
            Me.progressBarSearch.Value = newPos
        Else
            ' 是的话启用delegate访问 
            Dim showProgressDl As New ShowProgressDelegate(AddressOf ShowProgress)
            ' 如使用Invoke会等到函数调用结束，而BeginInvoke不会等待直接往后走 
            Me.BeginInvoke(showProgressDl,New Object() {newPos})
        End If
    End Sub
End Class

2.使用：BackgroundWorker 组件来处理。

Imports System.Net
Imports System.Threading
Public Class FrmBgWorker
    Private LanHost As String(,)
    Private thread As Thread()
    Private LocalIPStr As String
    '初始化数组
    Private Sub InitLanHost()
        LanHost = New String(254,1) = ""
        Next
    End Sub
    '查询主机
    Private Sub LanSearch()
        thread = New Thread(254) {}
        Dim localhost As String = (Dns.GetHostEntry(Dns.GetHostName())).AddressList(0).ToString()
        '本地主机IP地址 
        LocalIPStr = localhost.Substring(0,localhost.LastIndexOf("."))
        Dim threadMethod As ThreadStart
        For i As Integer = 0 To 254
            '建立255个线程扫描IP 
            threadMethod = New ThreadStart(AddressOf LanSearchThreadMethod)
            thread(i) = New Thread(threadMethod)
            thread(i).Name = i.ToString()
            thread(i).Start()
            If Not thread(i).Join(100) Then
                'Thread.Join(100)不知道这处这么用对不对，感觉没什么效果一样 
                thread(i).Abort()
            End If
            Me.BgWorker.ReportProgress(0,i.ToString)
        Next
        'using  event or thread  to access the serach result
        'RaiseEvent FList()  
        '注意注册事件or用线程
        'Dim th As Thread = New Thread(AddressOf ListLanHost)
        'th.Start()
    End Sub
    ''' 多线程搜索方法 
    Private Sub LanSearchThreadMethod()
        Dim Currently_i As Integer = Convert.ToInt32(Threading.Thread.CurrentThread.Name.ToString)
        '当前进程名称 
        Dim ScanIP As IPAddress = IPAddress.Parse((LocalIPStr & ".") + Convert.ToString(Currently_i + 1))
        '获得扫描IP地址 
        Dim ScanHost As IPHostEntry = Nothing
        ScanHost = Net.Dns.GetHostEntry(ScanIP)
        '获得扫描IP地址主机信息 
        If ScanHost IsNot Nothing Then
            LanHost(Currently_i,1) = ScanHost.HostName
        End If
    End Sub
    '搜索后，显示到listview里面，因为是用BackGroundWorker组件。所以在
    Private Sub ListLanHost()
        'Dim AddLvInst As New SetListViewDelegate(AddressOf AddLvFunc)
        Dim lv As ListViewItem
        For i As Integer = 0 To 254
            If LanHost(i,0))
                ' ListView1.Invoke(AddLvInst,lv)
                Me.ListView1.Items.Add(lv)
            End If
        Next
        Me.TextBox1.Text = String.Format("搜索完毕:{0}，共找到主机:{1}台。",LanHost.GetLength(0).ToString,Me.ListView1.Items.Count.ToString)
    End Sub
    Private Sub FrmBgWorker_Load(ByVal sender As Object,ByVal e As System.EventArgs) Handles Me.Load
        InitLanHost()
    End Sub
    Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
        Me.BgWorker.RunWorkerAsync()
    End Sub
    Private Sub BgWorker_DoWork(ByVal sender As System.Object,ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BgWorker.DoWork
        LanSearch()
    End Sub
    Private Sub BgWorker_ProgressChanged(ByVal sender As System.Object,ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles BgWorker.ProgressChanged
        Me.TextBox1.Text = String.Format("搜索IP:{0}.{1}",e.UserState.ToString)
        Me.PrgsBar.Value = CInt(e.UserState.ToString)
    End Sub
    Private Sub BgWorker_RunWorkerCompleted(ByVal sender As System.Object,ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BgWorker.RunWorkerCompleted
        ListLanHost()
    End Sub
End Class

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。

相关推荐

VB Format函数
Format[$] ( expr [ , fmt ] ) format 返回变体型 format$ 强制返回为文本 -------------------------------- 数字类型的格式化 --------------------------------     固定格式参数：     General Number 普通数字，如可以用来去掉千位分隔号     format$("100,1
vb6/ASP FORMAT MM/DD/YYYY
VB6或者ASP 格式化时间为 MM/dd/yyyy 格式，竟然没有好的办法， Format 或者FormatDateTime 竟然结果和系统设置的区域语言的日期和时间格式相关。意思是尽管你用诸如 Format(Now, "MM/dd/yyyy")，如果系统的设置格式区域语言的日期和时间格式分隔符是"-",那他还会显示为 MM-dd-yyyy     只有拼凑： <%response.write
VB.net 捕获项目全局异常
在项目中添加如下代码：新建窗口来显示异常信息。 Namespace My ‘全局错误处理，新的解决方案直接添加本ApplicationEvents.vb 到工程即可 ‘添加后还需要一个From用来显示错误。如果到这步还不会则需要先打好基础啦 ‘======================================================== ‘以下事件
实现用VB.Net/(C#)开发K/3 BOS 插件的真正可行方法
转了这一篇文章，原来一直想用C#做k3的插件开发，vb没有C#用的爽呀，这篇文章写与2011年，看来我以前没有认真去找这个方法呀。 https://blog.csdn.net/chzjxgd/article/details/6176325 金蝶K3 BOS的插件官方是用VB6编写的，如果  能用.Net下的语言工具开发BOS插件是一件很愉快的事情，其中缘由不言而喻，而本文则是个人首创，实现在了用V
vb，wps，excel 分裂
Sub 分列() ‘以空格为分隔符，连续空格只算1个。对所选中的单元格进行处理 Dim m As Range, tmpStr As String, s As String Dim x As Integer, y As Integer, subStr As String If MsgBox("确定要分列处理吗？请确定分列的数据会覆盖它后面的单元格！", _
VB文件 hash 查看器
  窗体代码 1 Private Sub Text1_OLEDragDrop(Data As DataObject, Effect As Long, Button As Integer, Shift As Integer, X As Single, Y As Single) 2 Dim path As String, hash As String 3 For Each fil
VB.NET MYSQL DataGridView 增删改查INSERT,SELECT,UPDATE,DELETE
  Imports MySql.Data.MySqlClient Public Class Form1 ‘ GLOBAL DECLARATIONS Dim conString As String = "Server=localhost;Database=net2;Uid=root;Pwd=123456;" Dim con As New MySqlConnection
VB.NET 使用ADODB連接資料庫滙出到EXCEL
‘導入命名空間 Imports ADODB Imports Microsoft.Office.Interop   Private Sub A1() Dim Sql As String Dim Cnn As New ADODB.Connection Dim Rs As New ADODB.Recordset Dim S As String   S = "Provider=OraOLEDB.Oracl
vb.net 多线程運用 ping
Imports System.IO Imports System.Threading Imports System.Diagnostics Public Class Form1 Dim A(254) As String    Function ping(ByVal IP As Integer) As String Dim IPAddress As String IPAddress = "10.0.
VB等待进程结束
VB运行EXE程序，并等待其运行结束 参考：https://blog.csdn.net/useway/article/details/5494084 Private Declare Function WaitForSingleObject Lib "kernel32" (ByVal hHandle As Long, ByVal dwMilliseconds As Long) As Long Pr
vb中去掉string数组的一部分
今天碰到一个问题，登陆的时候，如果不需要验证手机号为空，则不去验证手机号 因为登陆的时候所有的验证信息都存放在一个数组里 Dim CheckUserInfo() As String ={UserBirthday, SecEmail, UserMob, UserSex, RealNameFirst, RealName, CheckCardID, CheckCardType, Contactemail
VB如何连接SQL Server数据库
在VB6.0中，数据访问接口有三种： 1、ActiveX数据对象（ADO） 2、远程数据对象（RDO） 3、数据访问对象（DAO） 1.使用ADO（ActiveX Data Objec，ActiveX数据对象）连接SQL Server 1）使用ADO控件连接 使用ADO控件的ConnectionString属性就可以连接SQL Server，该属性包含一个由分号分隔的argument=value语
Visual Basic 6.0VB6.0详细安装过程
注：大家如果没有VB6.0的安装文件，可自行百度一下下载，一般文件大小在200M左右的均为完整版的软件，可以使用。   特别提示：安装此软件的时候最好退出360杀毒软件（包括360安全卫士，电脑管家等，如果电脑上有这些软件的话），因为现如今的360杀毒软件直接会对VB6.0软件误报，这样的话就可能会在安装过程中被误报阻止而导致安装失败，或者是安装后缺乏很多必须的组件（其它的杀毒软件或安全卫士之类的
使用VB6读取数据库资源并发送邮件原创
Private Sub Form_Load() Call conndb End Sub Private Function conndb() Dim cn As New ADODB.Connection Dim rs As New ADODB.Recordset Dim strCn, sql As String Dim db_host As String Dim db_user As String
POS VB
  PPSM06S70:  Add  moddate  EDITSPRINTJOB:  MAX(TO_CHAR(ETRN.MODDATE, ‘yyyy/mm/dd/HH24:MI AM‘)) ACTUAL_SHIPDATE   4.Test Scenario (1) ：Query SQL Test DN:8016578337 SELECT CTRN.TKCTID TRUCK_ID,        
vb.net 水晶報表CrystalReport 動態設定資料庫來源
  沒有出現CrystalReportViewer時,須安裝CRforVS_13_0. 新增1個數據集,新增1個數據表,添加二列,列名要和資料庫名一樣. 修改目標Framework 修改app.config, <startup >改成<startup useLegacyV2RuntimeActivationPolicy ="true">  CrystalReport1.rpt增加數據庫專家 在表單
VB.net 与线程
Imports System.Threading Imports System Public Class Form1 Dim th1, th2 As Thread Public Sub Method1() Dim i As Integer For i = 1 To 100 If Me.Label1.BackColor =
vb.net Process32First和Module32First
Friend Const PROCESS_ALL_ACCESS = &H1F0FFF = 2035711 Friend Const PROCESS_VM_READ = &H10 Friend Const PROCESS_VM_WRITE = &H20 Friend Const PAGE_READONLY = &H2 Friend Const PAGE_READWRITE = &H4 Friend
vb.net 分割byte数组的方法SplitBytes
以下代码随手写的 并没有大量测试 效率也有待提升 如果需要C#的请自行转换 Function SplitBytes(Data As Byte(), Delimiter As Byte()) As List(Of Byte()) Dim i = 0 Dim List As New List(Of Byte()) Dim bytes As New
VB.NET连接SQL_Server实例
Imports System.Data.SqlClient Public Class Form1 REM Public conn1 As SqlConnection = New SqlConnection("server=.; Integrated Security=False;Initial Catalog= mydatabase1; User ID= sa;password")
pythonJavaScriptjavaHTMLPHPreactjsC#AndroidCSSNode.jssqlrpython-3.xMysqLjQueryc++pandasFlutterangularIOSdjangolinuxswifttypescript路由器JSON路由器设置无线路由器h3c华三华三路由器设置华三路由器电脑软件教程arraysdocker软件图文教程Cvue.jslaravelspring-boot