学步园

/* Author: bhw<br /> EMail: bhwshx@163.com<br /> Date: Thu 12 Mar 2009 03:27:49 PM CSTa*/<br /> //实现最简单的网络聊天功能（客户端版）<br /> #include<unistd.h><br /> #include<sys/socket.h><br /> #include<netinet/in.h><br /> #include<arpa/inet.h><br /> #include<stdio.h><br /> #include<stdlib.h><br /> #include<string.h></p> <p>#define BUFSIZE 2048<br /> int main(int argc, char *argv[])<br /> {<br /> int sockfd;<br /> pid_t pid;<br /> size_t rcvLen;<br /> struct sockaddr_in addr;<br /> char sendbuf[BUFSIZE],<br /> rcvbuf[BUFSIZE];<br /> char from[30];<br /> unsigned int port;<br /> if(argc != 3)<br /> {<br /> printf("Usage: %s [target ip] [target port]/n", argv[0]);<br /> return 1;<br /> }</p> <p> strcpy(from, argv[1]);<br /> port = atoi(argv[2]);</p> <p> printf("port %d is opened./n", port);<br /> sockfd = socket(AF_INET, SOCK_STREAM, 0);<br /> if(sockfd == -1)<br /> {<br /> perror("socket");<br /> return 1;<br /> }</p> <p> bzero(&addr, sizeof(addr));<br /> addr.sin_family = AF_INET;<br /> addr.sin_port = htons(port);<br /> addr.sin_addr.s_addr = inet_addr(argv[1]);</p> <p> if(connect(sockfd, (struct sockaddr *)&addr, sizeof(addr)) != 0)<br /> {<br /> perror("connect");<br /> return 1;<br /> }<br /> printf("Connected to server./n");<br /> read(sockfd, rcvbuf, sizeof(rcvbuf));<br /> printf("%s/n", rcvbuf);</p> <p> pid = fork();<br /> while(1)<br /> {<br /> if(pid == 0)<br /> {<br /> bzero(rcvbuf, BUFSIZE);</p> <p> if((rcvLen = read(sockfd, rcvbuf, sizeof(rcvbuf))) < 0)<br /> printf("read from server error/n");<br /> else if(rcvLen > 0)<br /> printf("From %s: %s/n", from, rcvbuf);<br /> else<br /> return 1;<br /> }</p> <p> if(pid > 0)<br /> {<br /> bzero(sendbuf, BUFSIZE);</p> <p> if(fgets(sendbuf, BUFSIZE, stdin) != NULL)<br /> write(sockfd, sendbuf, strlen(sendbuf));<br /> }<br /> }</p> <p> close(sockfd);<br /> return 0;<br /> }<br />