使用C#开发Socket通讯

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本文介绍了一个使用C#语言通过Socket类实现向HTTP服务器发送请求并接收响应的示例代码。该示例展示了如何设置请求头信息、连接到指定的服务器、发送HTTP GET请求及读取返回的数据。

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使用C#开发Socket通讯

2007年03月24日星期六下午 06:45

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;
}