socket编程：select 用法 例子

鄢写的，参考之用

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服务器：

#include <stdio.h> #include <string.h> #include <WINSOCK2.H> #pragma comment(lib,"ws2_32.lib") #define INT_SERVER_PORT 6002 #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!/r/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!/r/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!/r/n"); WSACleanup(); return; } if (0 != listen(sockServer,5)) { printf("Failed to listen client!/r/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.../r/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!/r/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./r/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!/r/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/r/n",inet_ntoa(addrTemp.sin_addr), ntohs(addrTemp.sin_port),szDataBuff); } } } } } else if (SOCKET_ERROR == iResult) { //WSACleanup(); // printf("Faild to select sockt in server!/r/n"); Sleep(100); } } WSACleanup(); }

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客户端：

#include <stdio.h> #include <string.h> #include <WINSOCK2.H> #pragma comment(lib,"ws2_32.lib") #define INT_SERVER_PORT 6002 #define STR_SERVER_IP "127.0.0.1" #define INT_DATABUFFER_SIZE 100 #define STR_EXIT "exit" void main(void) { WSAData wsaData; WSAStartup(WINSOCK_VERSION,&wsaData); SOCKET sockClient = socket(AF_INET,SOCK_STREAM,0); if (INVALID_SOCKET == sockClient) { printf("Failed to create client!/r/n"); WSACleanup(); } sockaddr_in addrClient; addrClient.sin_addr.S_un.S_addr = inet_addr(STR_SERVER_IP); addrClient.sin_family = AF_INET; addrClient.sin_port = htons(INT_SERVER_PORT); int iResult; iResult = connect(sockClient,(sockaddr *)&addrClient,sizeof(sockaddr_in)); if (SOCKET_ERROR == iResult) { printf("Failed to connect server!/r/n"); WSACleanup(); return; } if (0 != iResult) { int iErrorCode; iErrorCode = WSAGetLastError(); printf("Failed to connect server,error:%d./r/n",iErrorCode); WSACleanup(); return; } char szDataBuffer[INT_DATABUFFER_SIZE]; while(1) { memset(szDataBuffer,0,INT_DATABUFFER_SIZE); scanf("%s",szDataBuffer); if (0 == strcmp(szDataBuffer,STR_EXIT)) { printf("The client has stopped!/r/n"); break; } else { if (1 > send(sockClient,szDataBuffer,strlen(szDataBuffer),0)) { printf("Failed to send data!/r/n"); } } Sleep(100); } closesocket(sockClient); WSACleanup(); }