VB與VB.NET串口及以太網(wǎng)通迅

關(guān)于串口通訊的問題：

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很明顯，你還不知道（不會(huì)、不習(xí)慣）使用事件驅(qū)動(dòng)的方式接收數(shù)據(jù)。

建議你仔細(xì)看看串口組件（無(wú)論VB6還是VB.net）的OnComm事件，你的問題很容易解決。

關(guān)于以太網(wǎng)通訊：

在TCP通訊中端口確實(shí)可以重用，你百度一下“TCP端口重用”能查到很多示例。

但絕大多數(shù)情況下不推薦端口重用，而應(yīng)該采取服務(wù)器端建立連接池的方法。

或者，干脆不用TCP，用UDP解決也可以。

用vb.net實(shí)現(xiàn)網(wǎng)絡(luò)通信

用 vb.net socket通信

Dim th As Threading.Thread

2 Dim tcpl As System.Net.Sockets.TcpListener

3

4 Private Sub Form1_Load()Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

5 th = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf MyListen))

6 th.Start()

7 End Sub

8

9 Public Sub SendMessage()Sub SendMessage(ByVal IP As String, ByVal SendMsg As String)

10 Try

11 If IP "" Then

12 Dim tcpc As New System.Net.Sockets.TcpClient(IP, 5656)

13 Dim tcpStream As Net.Sockets.NetworkStream = tcpc.GetStream

14 Dim reqStream As New IO.StreamWriter(tcpStream)

15 reqStream.Write(SendMsg)

16 reqStream.Flush()

17 tcpStream.Close()

18 tcpc.Close()

19 End If

20 Catch ex As Exception

21 MsgBox(ex.Message.ToString)

22 End Try

23 End Sub

24 Private Sub MyListen()Sub MyListen()

25 Try

26 Dim ipAddress As System.Net.IPAddress = System.Net.Dns.Resolve(System.Net.Dns.GetHostName).AddressList(0)

27 tcpl = New System.Net.Sockets.TcpListener(ipAddress, 5656)

28 tcpl.Start()

29 While True

30 Dim s As System.Net.Sockets.Socket = tcpl.AcceptSocket()

31 Dim MyBuffer(1024) As Byte

32 Dim i As Integer

33 i = s.Receive(MyBuffer)

34 If i 0 Then

35 Dim lstrRec As String

36 Dim j As Integer

37 For j = 0 To i - 1

38 TextBox1.Text += Chr(MyBuffer(j)) ","

39 Next

40 End If

41 End While

42 Catch ex As Exception

43 MsgBox(ex.Message.ToString)

44 End Try

45 End Sub

46

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

48 SendMessage("192.168.0.61", TextBox2.Text)

49 End Sub

誰(shuí)能分享一下vb.net多線程的簡(jiǎn)單例子，證明線程之間互不干擾，加上注釋最好。

Imports?System

Imports?System.Threading

Public?Class?Form1

Dim?TestThread1,?TestThread2?As?Thread

Public?Sub?TestMethod1()

Dim?i?As?Integer

i?=?0

While?(i??1000)

Label1.Text?=?i

i?+=?1

End?While

End?Sub

Public?Sub?TestMethod2()

Dim?i?As?Integer

i?=?0

While?(i??1000)

Label2.Text?=?i

i?+=?1

End?While

End?Sub

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

Control.CheckForIllegalCrossThreadCalls?=?False

TestThread1?=?New?Thread(New?ThreadStart(AddressOf?TestMethod1))

TestThread1.Start()

End?Sub

Private?Sub?Button2_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button2.Click

Control.CheckForIllegalCrossThreadCalls?=?False

TestThread2?=?New?Thread(New?ThreadStart(AddressOf?TestMethod2))

TestThread2.Start()

End?Sub

Private?Sub?Button3_Click(ByVal?sender?As?System.Object,?ByVal?e?As?System.EventArgs)?Handles?Button3.Click

Control.CheckForIllegalCrossThreadCalls?=?False

TestThread1?=?New?Thread(New?ThreadStart(AddressOf?TestMethod1))

TestThread2?=?New?Thread(New?ThreadStart(AddressOf?TestMethod2))

TestThread1.Start()

TestThread2.Start()

End?Sub

End?Class

VB.NET編寫 一個(gè) 多線程 串口通訊 程序

串口通訊不需要多線程吧

如果你執(zhí)意要學(xué)

分開學(xué) 這個(gè)是兩個(gè)不同的概念

串口通訊和多線程分開學(xué)

當(dāng)前題目：vb.net線程之間通信,vbnet多線程簡(jiǎn)單
標(biāo)題來(lái)源：http://chinadenli.net/article47/dsgeohj.html

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