socket是由操作系统自己实现的...
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using System.Text;
using System.IO;
using System.Net;
using System.Net.Sockets;public class mySocket
{
private static Socket connectSocket(string server, int port)
{
Socket s = null;
IPHostEntry iphe = null;
try
{
// Get host related information.
iphe = Dns.Resolve(server);
// Loop through the AddressList to obtain the supported AddressFamily. This is to avoid
// an exception to be thrown if the host IP Address is not compatible with the address family
// (typical in the IPv6 case).
foreach(IPAddress ipad in iphe.AddressList)
{
IPEndPoint ipe = new IPEndPoint(ipad, port); Socket tmpS =
new Socket(ipe.AddressFamily, SocketType.Stream, ProtocolType.Tcp); tmpS.Connect(ipe); if(tmpS.Connected)
{
s = tmpS;
break;
}
else
continue;
}
}
catch(SocketException e)
{
Console.WriteLine("SocketException 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 s; }
// This method requests the home page content for the passed server.
// It displays the number of bytes received and the page content.
private static string socketSendReceive(string server, int port)
{
//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; // Create a socket connection with the specified server and port.
Socket s = connectSocket(server, port); if (s == null)
return ("Connection failed");
// Send request to the server.
s.Send(ByteGet, ByteGet.Length, 0);
// Receive the server home page content.
Int32 bytes = s.Receive(RecvBytes, RecvBytes.Length, 0);
// Read the first 256 bytes.
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);
}
return strRetPage;
}
public static void Main(string[] args)
{
string host;
int port = 80; if (args.Length == 0)
// If no server name is passed as argument to this program, use the current
// host name as default.
host = Dns.GetHostName();
else
host = args[0];
string result = socketSendReceive(host, port);
Console.WriteLine(result);
}
}
internal static extern IntPtr socket([In] AddressFamily addressFamily, [In] SocketType socketType, [In] ProtocolType protocolType); [DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSAAddressToString([In] byte[] socketAddress, [In] int socketAddressSize, [In] IntPtr lpProtocolInfo, [Out] StringBuilder addressString, [In, Out] ref int addressStringLength);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSACleanup();
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSAEnumNetworkEvents([In] IntPtr socketHandle, [In] IntPtr Event, [In, Out] ref NetworkEvents networkEvents);
[DllImport("ws2_32.dll", CharSet=CharSet.Auto, SetLastError=true)]
internal static extern int WSAEnumProtocols([In, MarshalAs(UnmanagedType.LPArray)] int[] lpiProtocols, [In] IntPtr lpProtocolBuffer, [In] ref uint lpdwBufferLength);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSAEventSelect([In] IntPtr socketHandle, [In] IntPtr Event, [In] AsyncEventBits NetworkEvents);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern uint WSAGetLastError();
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern bool WSAGetOverlappedResult([In] IntPtr socketHandle, [In] IntPtr overlapped, out uint bytesTransferred, [In] bool wait, [In] IntPtr ignored);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSAIoctl([In] IntPtr socketHandle, [In] int ioControlCode, [In] byte[] inBuffer, [In] int inBufferSize, [Out] byte[] outBuffer, [In] int outBufferSize, out int bytesTransferred, [In] IntPtr overlapped, [In] IntPtr completionRoutine);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSARecv([In] IntPtr socketHandle, [In, Out] ref WSABuffer Buffer, [In] int BufferCount, [In] IntPtr bytesTransferred, [In, Out] ref SocketFlags socketFlags, [In] IntPtr overlapped, [In] IntPtr completionRoutine);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSARecvFrom([In] IntPtr socketHandle, [In, Out] ref WSABuffer Buffer, [In] int BufferCount, [In] IntPtr bytesTransferred, [In, Out] ref SocketFlags socketFlags, [In] IntPtr socketAddressPointer, [In] IntPtr socketAddressSizePointer, [In] IntPtr overlapped, [In] IntPtr completionRoutine);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSASend([In] IntPtr socketHandle, [In] WSABuffer[] BufferArray, [In] int BufferCount, [In] IntPtr bytesTransferred, [In] SocketFlags socketFlags, [In] IntPtr overlapped, [In] IntPtr completionRoutine);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSASend([In] IntPtr socketHandle, [In] ref WSABuffer Buffer, [In] int BufferCount, [In] IntPtr bytesTransferred, [In] SocketFlags socketFlags, [In] IntPtr overlapped, [In] IntPtr completionRoutine);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSASendTo([In] IntPtr socketHandle, [In] ref WSABuffer Buffer, [In] int BufferCount, [In] IntPtr BytesWritten, [In] SocketFlags socketFlags, [In] byte[] socketAddress, [In] int socketAddressSize, [In] IntPtr overlapped, [In] IntPtr completionRoutine);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern IntPtr WSASocket([In] AddressFamily addressFamily, [In] SocketType socketType, [In] ProtocolType protocolType, [In] IntPtr protocolInfo, [In] uint group, [In] SocketConstructorFlags flags);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSAStartup([In] short wVersionRequested, out WSAData lpWSAData);
[DllImport("ws2_32.dll", CharSet=CharSet.Ansi, SetLastError=true)]
internal static extern int WSAStringToAddress([In] string addressString, [In] AddressFamily addressFamily, [In] IntPtr lpProtocolInfo, [Out] byte[] socketAddress, [In, Out] ref int socketAddressSize);