windows socket编程：select 用法 例子

http://blog.csdn.net/zjsiva/article/details/5895087

服务器端：

#include <stdio.h>  #include <string.h>  #include <WINSOCK2.H>    #pragma comment(lib,"ws2_32.lib")    #define INT_SERVER_PORT 5000  #define STR_SERVER_IP "127.0.0.1"  #define INT_DATABUFFER_SIZE 100    void main(void)  {      WORD dwVersion = MAKEWORD(2,2);      WSAData wsaData;      WSAStartup(WINSOCK_VERSION,&wsaData);        SOCKET sockServer = socket(AF_INET,SOCK_STREAM,0);      if (INVALID_SOCKET == sockServer)      {          printf("Failed to create socket!\n");          WSACleanup();          return;      }        sockaddr_in addrServer;      memset(&addrServer,0,sizeof(sockaddr_in));      addrServer.sin_family = AF_INET;      addrServer.sin_port = htons(INT_SERVER_PORT);      addrServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY);      //addrServer.sin_addr.s_addr = htonl(INADDR_ANY);        int iResult;        bool bReuseAddr=true;      iResult=setsockopt(sockServer,SOL_SOCKET,SO_REUSEADDR,(char *)&bReuseAddr,sizeof(bReuseAddr));      if(SOCKET_ERROR == iResult)      {          printf("Failed to set resueaddr socket!\n");          WSACleanup();          return;      }            /*     unsigned   long cmd = 1;      iResult= ioctlsocket(sockServer,FIONBIO,&cmd); */        iResult = bind(sockServer,(sockaddr *)&addrServer,sizeof(addrServer));      if (SOCKET_ERROR == iResult)      {          printf("Failed to bind address!\n");          WSACleanup();          return;      }        if (0 != listen(sockServer,5))      {          printf("Failed to listen client!\n");          WSACleanup();          return;      }        UINT i = 0;      SOCKET sockAccept;      sockaddr_in addrAccept;      int iAcceptLen = sizeof(addrAccept);      char szDataBuff[INT_DATABUFFER_SIZE];      int iRecvSize;            sockaddr_in addrTemp;      int iTempLen;        fd_set fd;      FD_ZERO(&fd);      FD_SET(sockServer,&fd);        /*     timeval tm;     tm.tv_sec = 0;     tm.tv_usec = 1000;     */      printf("Start server...\n");      while(1)      {          fd_set fdOld = fd;          iResult = select(0,&fdOld,NULL,NULL,/*&tm*/NULL);          if (0 <= iResult)          {              for(i = 0;i < fd.fd_count; i++)              {                  if (FD_ISSET(fd.fd_array[i],&fdOld))                  {                      //如果socket是服务器，则接收连接                      if (fd.fd_array[i] == sockServer)                      {                          memset(&addrAccept,0,sizeof(addrTemp));                          sockAccept = accept(sockServer,(sockaddr *)&addrAccept,&iAcceptLen);                          if (INVALID_SOCKET != sockAccept)                          {                              FD_SET(sockAccept,&fd);                              //FD_SET(sockAccept,&fdOld);                              printf("%s:%d has connected server!\n",inet_ntoa(addrAccept.sin_addr),                                  ntohs(addrAccept.sin_port));                          }                      }                      else //非服务器,接收数据(因为fd是读数据集)                      {                          memset(szDataBuff,0,INT_DATABUFFER_SIZE);                          iRecvSize = recv(fd.fd_array[i],szDataBuff,INT_DATABUFFER_SIZE,0);                          memset(&addrTemp,0,sizeof(addrTemp));                          iTempLen = sizeof(addrTemp);                          getpeername(fd.fd_array[i],(sockaddr *)&addrTemp,&iTempLen);                                                    if (SOCKET_ERROR == iRecvSize)                          {                              closesocket(fd.fd_array[i]);                              FD_CLR(fd.fd_array[i],&fd);                              i--;                              printf("Failed to recv data ,%s:%d errorcode:%d.\n",                                  inet_ntoa(addrTemp.sin_addr),ntohs(addrTemp.sin_port),WSAGetLastError());                              continue;                          }                            if (0 == iRecvSize)                          {                              //客户socket关闭                              printf("%s:%d has closed!\n",inet_ntoa(addrTemp.sin_addr),                                  ntohs(addrTemp.sin_port));                                                            closesocket(fd.fd_array[i]);                              FD_CLR(fd.fd_array[i],&fd);                              i--;                              }                                                    if (0 < iRecvSize)                          {                              //打印接收的数据                              printf("recv %s:%d data:%s\n",inet_ntoa(addrTemp.sin_addr),                                  ntohs(addrTemp.sin_port),szDataBuff);                          }                      }                     }              }          }          else if (SOCKET_ERROR == iResult)          {              //WSACleanup();           //  printf("Faild to select sockt in server!\n");              Sleep(100);          }      }      WSACleanup();  }  

客户端可以直接用nc，即netcat