.Net中的socket编程例子

vb2010：

'发送端代码
Public Class Form1
    Inherits System.Windows.Forms.Form
Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
        Dim bytes(1024) As Byte '声明字节数组
        Dim sender1 As New System.Net.Sockets.Socket(Net.Sockets.AddressFamily.InterNetwork,Net.Sockets.SocketType.Stream,Net.Sockets.ProtocolType.Tcp)'初始化socket
        Dim msg As Byte() = System.Text.Encoding.ASCII.GetBytes(TextBox1.Text)'对发送的数据进行编码
        '***************************
        '指定ip和端口
        Dim ipHostInfo As System.Net.IPHostEntry = System.Net.Dns.GetHostEntry("a") 'a为要发送到的主机名，也可以指定为本机，那么就是在本机发送和接收

        Dim ipAddress As System.Net.IPAddress = ipHostInfo.AddressList(2) '注意此处在调试时必须取出IPv4协议下的IP地址，根据实际情况变换index值，直到取出取出IPv4协议下的IP地址，不然会报协议和IP不符合的错误
        Dim ipe As New System.Net.IPEndPoint(ipAddress, 11000)
        '**********************
        sender1.Connect(ipe) '建立连接

        Dim bytesSent As Integer = sender1.Send(msg) '发送数据
        '（（（（（（（（（
        '关闭socket
        sender1.Shutdown(Net.Sockets.SocketShutdown.Both)
        sender1.Close()
        '）））））））
    End Sub
End Class

'接收端代码
Public Class Form1
    Inherits System.Windows.Forms.Form
    Dim listener As New System.Net.Sockets.Socket(Net.Sockets.AddressFamily.InterNetwork, Net.Sockets.SocketType.Stream,Net.Sockets.ProtocolType.Tcp)
    '初始socket
Private Sub Form1_Load(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles MyBase.Load
        '指定ip和端口
        Dim ipHostInfo As System.Net.IPHostEntry = System.Net.Dns.GetHostEntry(System.Net.Dns.GetHostName())
        Dim ipAddress As System.Net.IPAddress = ipHostInfo.AddressList(2)
        Dim localEndPoint As New System.Net.IPEndPoint(ipAddress, 11000)
        listener.Bind(localEndPoint)
        listener.Listen(10)
    End Sub
Private Sub Button1_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button1.Click
        Dim bytes() As Byte = New [Byte](1024) {}
        Dim handler As System.Net.Sockets.Socket = listener.Accept() '建立连接请求
        Dim data As String = Nothing
        bytes = New Byte(1024) {}
        Dim bytesRec As Integer = handler.Receive(bytes) '接收数据
        data += System.Text.Encoding.ASCII.GetString(bytes, 0, bytesRec)
        TextBox1.Text = data
        Dim msg As Byte() = System.Text.Encoding.ASCII.GetBytes(data)
        handler.Shutdown(Net.Sockets.SocketShutdown.Both)
        handler.Close()
    End Sub
End Class