C实现的聊天程序

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C实现的聊天程序 1.服务器端

#include #include #include #include #include #include #include #include #include #include#define BUFLEN 1024 #define PORT 6666 #define LISTNUM 20int main() { int sockfd, newfd; struct sockaddr_in s_addr, c_addr; char buf[BUFLEN]; socklen_t len; unsigned int port, listnum; fd_set rfds; struct timeval tv; int retval,maxfd; /*建立socket*/ if((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1){ perror("socket"); exit(errno); }else printf("socket create success!\n"); memset(&s_addr,0,sizeof(s_addr)); s_addr.sin_family = AF_INET; s_addr.sin_port = htons(PORT); s_addr.sin_addr.s_addr = htons(INADDR_ANY); /*把地址和端口帮定到套接字上*/ if((bind(sockfd, (struct sockaddr*) &s_addr,sizeof(struct sockaddr))) == -1){ perror("bind"); exit(errno); }else printf("bind success!\n"); /*侦听本地端口*/ if(listen(sockfd,listnum) == -1){ perror("listen"); exit(errno); }else printf("the server is listening!\n"); while(1){ printf("*****************聊天开始***************\n"); len = sizeof(struct sockaddr); if((newfd = accept(sockfd,(struct sockaddr*) &c_addr, &len)) == -1){ perror("accept"); exit(errno); }else printf("正在与您聊天的客户端是:%s: %d\n",inet_ntoa(c_addr.sin_addr),ntohs(c_addr.sin_port)); while(1){ FD_ZERO(&rfds); FD_SET(0, &rfds); maxfd = 0; FD_SET(newfd, &rfds); /*找出文件描述符集合中最大的文件描述符*/ if(maxfd < newfd) maxfd = newfd; /*设置超时时间*/ tv.tv_sec = 6; tv.tv_usec = 0; /*等待聊天*/ retval = select(maxfd+1, &rfds, NULL, NULL, &tv); if(retval == -1){ printf("select出错,与该客户端连接的程序将退出\n"); break; }else if(retval == 0){ printf("waiting...\n"); continue; }else{ /*用户输入信息了*/ if(FD_ISSET(0, &rfds)){ /******发送消息*******/ memset(buf,0,sizeof(buf)); /*fgets函数:从流中读取BUFLEN-1个字符*/ fgets(buf,BUFLEN,stdin); /*打印发送的消息*/ //fputs(buf,stdout); if(!strncasecmp(buf,"quit",4)){ printf("server 请求终止聊天!\n"); break; } len = send(newfd,buf,strlen(buf),0); if(len > 0) printf("\t消息发送成功:%s\n",buf); else{ printf("消息发送失败!\n"); break; } } /*客户端发来了消息*/ if(FD_ISSET(newfd, &rfds)){ /******接收消息*******/ memset(buf,0,sizeof(buf)); /*fgets函数:从流中读取BUFLEN-1个字符*/ len = recv(newfd,buf,BUFLEN,0); if(len > 0) printf("客户端发来的信息是:%s\n",buf); else{ if(len < 0 ) printf("接受消息失败!\n"); else printf("客户端退出了,聊天终止!\n"); break; } } } } /*关闭聊天的套接字*/ close(newfd); /*是否退出服务器*/ printf("服务器是否退出程序:y->是;n->否? "); bzero(buf, BUFLEN); fgets(buf,BUFLEN, stdin); if(!strncasecmp(buf,"y",1)){ printf("server 退出!\n"); break; } } /*关闭服务器的套接字*/ close(sockfd); return 0; }

2. 客户端

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