下面我給出支持單個(gè)Socket及支持多個(gè)Socket的Console程序代碼。先來看看支持單個(gè)Socket的程序,考慮到代碼簡潔性，只給一個(gè)框架，同時(shí)不進(jìn)行出錯(cuò)處理。
int main()
{
          WSAOVERLAPPED     Overlapped;
                  
          // 啟動(dòng)Winsock及建立監(jiān)聽套接字
           listen(hListenSocket,  5);
       
           hClientSocket   =   accept(hListenSocket,   NULL,   NULL);
           ZeroMemory(&Overlapped,   sizeof(WSAOVERLAPPED));
           
           nResult   =   WSARecv(...);    // 發(fā)出請(qǐng)求
        
          for (; ;)
          {
                   bResult   =   WSAGetOverlappedResult(...);
                   // 函數(shù)返回后進(jìn)行相應(yīng)的處理
                   nResult   =   WSARecv(...);  // 發(fā)出另外一個(gè)請(qǐng)求
          }
}
        上面的程序只是想說明一下過程，程序沒有實(shí)現(xiàn)什么功能。這樣做的目的是節(jié)約字?jǐn)?shù)，用來說明我下面支持多個(gè)Socket的Console應(yīng)用。請(qǐng)繼續(xù)看。
        先看一個(gè)自定義的結(jié)構(gòu)體，單句柄數(shù)據(jù)結(jié)構(gòu)，通過該結(jié)構(gòu),主線程與某個(gè)特定的子線程中的套接字相互聯(lián)系。
         typedef   struct    _PER_HANDLE_DATA
         {
                   SOCKET   hSocket;     // 主鍵:通信套接字
                  char    szClientIP[16];// 自定義字段:客戶端地址
                  int nOperateType;   // 自定義字段:操作類型
          }PER_HANDLE_DATA,   FAR*  LPPER_HANDLE_DATA;
         在上面的結(jié)構(gòu)中還可以加入自己需要的字段。在我下面的例子程序中，szClientIP是用來保存連接上來的客戶端的IP的，這樣在主線程將這個(gè)結(jié)構(gòu)體傳給子線程后，在子線程中根據(jù)客戶端IP就知道目前處理的是哪個(gè)客戶端了。下面是程序的大部分，同樣除去一些簡單的出錯(cuò)輸出。
#define     LISTEN_PORT 5000
#define     DATA_BUFSIZE 8192
#define     POST_RECV 0X01   
#define     POST_SEND 0X02

int   main(  )
{
           LPPER_HANDLE_DATA    lpPerHandleData;
           SOCKET               hListenSocket;
           SOCKET               hClientSocket;
           SOCKADDR_IN          ClientAddr;
           int                  nAddrLen;
           HANDLE               hThread; 

          // Start WinSock and create a listen socket.

          listen(hListenSocket,  5); 
          for (; ;)
         {
                  nAddrLen  =  sizeof(SOCKADDR);
                  hClientSocket  =  accept(hListenSocket,  (LPSOCKADDR)&ClientAddr,  &nAddrLen);

                  lpPerHandleData = (LPPER_HANDLE_DATA)malloc(sizeof(PER_HANDLE_DATA));
                  lpPerHandleData->hSocket  =  hClientSocket;
                  // 注意這里將連接的客戶端的IP地址，保存到了lpPerHandleData字段中了
                 strcpy(lpPerHandleData->szClientIP,   inet_ntoa(ClientAddr.sin_addr));

                 // 為本次客戶請(qǐng)求產(chǎn)生子線程
                 hThread = CreateThread(
                           NULL,
                           0,
                           OverlappedThread,
                           lpPerHandleData,   // 將lpPerHandleData傳給子線程
                           0,
                           NULL
                  );
                 CloseHandle(hThread);
         }   
 return 0;
}

DWORD   WINAPI   OverlappedThread(LPVOID    lpParam)
{
            LPPER_HANDLE_DATA     lpPerHandleData   =   (LPPER_HANDLE_DATA)lpParam;
            WSAOVERLAPPED Overlapped;
            WSABUF        wsaBuf;
            char          Buffer[DATA_BUFSIZE];
            BOOL          bResult;
            int           nResult;
   
            ZeroMemory(&Overlapped, sizeof(WSAOVERLAPPED));
            wsaBuf.buf = Buffer;
            wsaBuf.len = sizeof(Buffer);
            lpPerHandleData->nOperateType = POST_RECV;     // 記錄本次操作是Recv(..)

            dwFlags = 0;
            nResult = WSARecv(
                      lpPerHandleData->hSocket,   // Receive socket
                      &wsaBuf,                                  // 指向WSABUF結(jié)構(gòu)的指針
                      1,                                                 // WSABUF數(shù)組的個(gè)數(shù)
                      &dwNumOfBytesRecved,      // 存放當(dāng)WSARecv完成后所接收到的字節(jié)數(shù)
                      &dwFlags,                                 // A pointer to flags
                      &Overlapped,                           // A pointer to a WSAOVERLAPPED structure
                      NULL                                         // A pointer to the completion routine,this is NULL
           );
          if   ( nResult   ==   SOCKET_ERROR     &&   GetLastError() !=       WSA_IO_PENDING)
          {
                 printf("WSARecv(..) failed.\n");
                 free(lpPerHandleData);
                 return 1;
          }

         while (TRUE)
         {
                 bResult  =  WSAGetOverlappedResult(
                        lpPerHandleData->hSocket,  
                        &Overlapped,           
                        &dwBytesTransferred,       // 當(dāng)一個(gè)同步I/O完成后,接收到的字節(jié)數(shù)
                       TRUE,                      // 等待I/O操作的完成
                       &dwFlags                   
                 );
                if   (bResult  ==  FALSE  &&  WSAGetLastError()  !=  WSA_IO_INCOMPLETE)
               {
                         printf("WSAGetOverlappdResult(..) failed.\n");
                         free(lpPerHandleData);
                         return 1;   // 錯(cuò)誤退出
                }
        
                if  (dwBytesTransferred == 0)
                {
                           printf("客戶端已退出,將斷開與之的連接!\n");
                           closesocket(lpPerHandleData->hSocket);
                           free(lpPerHandleData);
                           break;
                }

                 // 在這里將接收到的數(shù)據(jù)進(jìn)行處理
               printf("Received from IP: %s.\ndata: %s\n", lpPerHandleData->szClientIP, wsaBuf.buf);    

               // 發(fā)送另外一個(gè)請(qǐng)求操作
               ZeroMemory(&Overlapped, sizeof(WSAOVERLAPPED));
               lpPerHandleData->nOperateType = POST_RECV;

               dwFlags = 0;
                nResult = WSARecv(...);
                if (...){}

         }

         return 0;
}
         程序結(jié)構(gòu)比較清晰，lpPerHandleData是主線程與子線程聯(lián)系的紐帶，子線程是通過這個(gè)結(jié)構(gòu)獲得所處理客戶端的情況的。在不同的應(yīng)用中可以將這個(gè)結(jié)構(gòu)定義成不同的形式，以符合所實(shí)現(xiàn)應(yīng)用的需要。注意結(jié)構(gòu)體的nOperateType在GetOverlappedResult返回時(shí)用到,可以根據(jù)這個(gè)字段確定我們下一步的操作。請(qǐng)朋友們多提意見了。