使用C#开发Socket通讯

下面的示例显示如何使用 Socket 类向 HTTP 服务器发送数据和接收响应。

[C#]

public string DoSocketGet(string server)

{

//Sets up variables and a string to write to the server

Encoding ASCII = Encoding.ASCII;

string Get = "GET / HTTP/1.1/r/nHost: " + server +

"/r/nConnection: Close/r/n/r/n";

Byte[] ByteGet = ASCII.GetBytes(Get);

Byte[] RecvBytes = new Byte[256];

String strRetPage = null;

// IPAddress and IPEndPoint represent the endpoint that will

// receive the request.

// Get the first IPAddress in the list using DNS.

IPAddress hostadd = Dns.Resolve(server).AddressList[0];

IPEndPoint EPhost = new IPEndPoint(hostadd, 80);

//Creates the Socket for sending data over TCP.

Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream,

ProtocolType.Tcp );

// Connects to the host using IPEndPoint.

s.Connect(EPhost);

if (!s.Connected)

{

strRetPage = "Unable to connect to host";

return strRetPage;

}

// Sends the GET text to the host.

s.Send(ByteGet, ByteGet.Length, SocketFlags.None);

// Receives the page, looping until all bytes are received

Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);

strRetPage = "Default HTML page on " + server + ":/r/n";

strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);

while (bytes > 0)

{

bytes = s.Receive(RecvBytes, RecvBytes.Length, SocketFlags.None);

strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes);

}

//如果想立即关闭连接则调用 s.Close();

return strRetPage;

}