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vb.net中udp net和vb

vb.net 怎樣用UDP 協(xié)議 寫一個(gè)聊天程序啊?如圖

'xiansr.2014/2/7 vb.net2010 調(diào)試通過

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Imports System.Net

Imports System.Net.Sockets

Imports System.Text

Public Class Form1

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

Dim udpClient As New UdpClient(11000)

Try

udpClient.Connect("127.0.0.1", 11000)

Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes(RichTextBox1.Text)

udpClient.Send(sendBytes, sendBytes.Length)

Dim RemoteIpEndPoint As New IPEndPoint(IPAddress.Any, 0)

Dim receiveBytes As [Byte]() = udpClient.Receive(RemoteIpEndPoint)

Dim returnData As String = Encoding.ASCII.GetString(receiveBytes)

RichTextBox2.Text = "接收到: " + returnData.ToString()

'Debug.Print(("This message was sent from " + RemoteIpEndPoint.Address.ToString() + " on their port number " + RemoteIpEndPoint.Port.ToString()))

udpClient.Close()

Catch ex As Exception

stop

End Try

End Sub

End Class

vb.net udpclient 發(fā)送大文件循環(huán)問題

'緩沖區(qū)長(zhǎng)度

Const BufLen As Integer=800

'包發(fā)送間隔

Const Interval As Integer=62

'緩沖區(qū)

Dim buf As Byte()=Nothing

'遠(yuǎn)程(目的)網(wǎng)絡(luò)端點(diǎn)

Dim remoteep As IPEndPoint=Nothing

'如果你已將s定義為類的成員變量(實(shí)例或共享),注釋掉下面這句

Dim s As UdpClient=Nothing

Dim willread As Integer

Try

buf=New Byte(BufLen-1) {}

s=New UdpClient()

' TextBox1.Text包含遠(yuǎn)程(目的)主機(jī)的IP地址

' TextBox2.Text包含遠(yuǎn)程(目的)主機(jī)的端口號(hào)

remoteep=New IPEndPoint(IPAddress.Parse(Trim(TextBox1.Text)),CInt(TextBox2.Text))

' Label2.Text包含要發(fā)送的文件的路徑

Using fs As New FileStream(Label2.Text,FileMode.Open,FileAccess.Read)

While fs.Positionfs.Length

willread=BufLen

If fs.Length-fs.PositionBufLen Then

willread=CInt(fs.Length-fs.Position)

End If

fs.Read(buf,0,willread)

s.Send(buf,willread,remoteep)

Thread.Sleep(Interval)

End While

End Using

Catch ex As Exception

MsgBox(ex.ToString())

Finally

If s IsNot Nothing Then

s.Close()

End If

End Try

vb.net UDP 本地發(fā)送和接收怎么使用同一個(gè)端口呢

DatagramSocket用于接收和發(fā)送UDP的Socket實(shí)例。該類有3個(gè)構(gòu)造函數(shù):DatagramSocket():通常用于客戶端編程,它并沒有特定監(jiān)聽的端口,僅僅使用一個(gè)臨時(shí)的。程序會(huì)讓操作系統(tǒng)分配一個(gè)可用的端口。DatagramSocket(int port):創(chuàng)建實(shí)例,并固定監(jiān)聽Port端口的報(bào)文。通常用于服務(wù)端。

名稱欄目:vb.net中udp net和vb
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