using System; using System.Text; using System.IO; using System.Net; using System.Net.Sockets;
public class Sample {
public static string DoSocketGet(string server) { //Set up variables and 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 first IPAddress in list return by DNS.
try {
// Define those variables to be evaluated in the next for loop and // then used to connect to the server. These variables are defined // outside the for loop to make them accessible there after. Socket s = null; IPEndPoint hostEndPoint; IPAddress hostAddress = null; int conPort = 80;
// Get DNS host information. IPHostEntry hostInfo = Dns.Resolve(server); // Get the DNS IP addresses associated with the host. IPAddress[] IPaddresses = hostInfo.AddressList;
// Evaluate the socket and receiving host IPAddress and IPEndPoint. for (int index=0; index<IPaddresses.Length; index++) { hostAddress = IPaddresses[index]; hostEndPoint = new IPEndPoint(hostAddress, conPort);
// Creates the Socket to send data over a TCP connection. s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp );
// Connect to the host using its IPEndPoint. s.Connect(hostEndPoint);
if (!s.Connected) { // Connection failed, try next IPaddress. strRetPage = "Unable to connect to host"; s = null; continue; }
// Sent the GET request to the host. s.Send(ByteGet, ByteGet.Length, 0);
} // End of the for loop.
// Receive the host home page content and loop until all the data is 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, 0); strRetPage = strRetPage + ASCII.GetString(RecvBytes, 0, bytes); }
} // End of the try block. catch(SocketException e) { Console.WriteLine("SocketException caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } catch(ArgumentNullException e) { Console.WriteLine("ArgumentNullException caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } catch(NullReferenceException e) { Console.WriteLine("NullReferenceException caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } catch(Exception e) { Console.WriteLine("Exception caught!!!"); Console.WriteLine("Source : " + e.Source); Console.WriteLine("Message : " + e.Message); } return strRetPage;
} public static void Main() { Console.WriteLine("请需入请求地址:"); String server =Console.ReadLine(); Console.WriteLine(DoSocketGet(server)); //存一下档 string path = @"D:\Socket.html"; if(File.Exists(path)) { File.Delete(path); } using(FileStream fs =File.Create(path)) { Byte[] bs =new UTF8Encoding(true).GetBytes(DoSocketGet(server)); fs.Write(bs,0,bs.Length); } } }

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