Linux客户端与服务器相互实现聊天功能

来源：互联网发布：模拟教学软件编辑：程序博客网时间：2024/06/06 19:30

这个实现方法只能够单线程聊天，recv是阻塞的，你发一句我回一句，必须一来一回，后文会记录多线程实现聊天

客户端代码如下

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>int main(int arg, char *args[]){if (arg < 3){return -1;}int port = atoi(args[2]);int st = socket(AF_INET, SOCK_STREAM, 0);//初始化socketstruct sockaddr_in addr; // 定义一个IP地址的结构memset(&addr, 0, sizeof(addr));addr.sin_family = AF_INET;// 设置结构地址类型为TCP/IP地址addr.sin_port = htons(port); // 制定一个端口号：8080，htons：将short类型从host字节类型转到net字节类型// 将字符类型的IP地址转化为int，赋给addr结构//addr.sin_addr.s_addr = inet_addr("127.0.0.1");addr.sin_addr.s_addr = inet_addr(args[1]);//if (connect(st, (struct sockaddr *)&addr, sizeof(addr)) == -1){printf("connect failed %s\n", strerror(errno));return EXIT_FAILURE;}char s[1024];while (1){memset(s, 0, sizeof(1024));read(STDIN_FILENO, s, sizeof(s)); // 从键盘读取用户输入if (send(st, s, strlen(s), 0) == -1){printf("send failed %s\n", strerror(errno));return EXIT_FAILURE;}memset(s, 0, sizeof(s));if (recv(st, s, sizeof(s), 0) > 0)// 如果接受数据失败循环结束，这里是阻塞调用，会停在这里等待服务端发送消息，服务端也是一样printf("recv %s\n", s);elsebreak;}close(st);return EXIT_SUCCESS;}

服务端代码如下

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <errno.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <arpa/inet.h>int main(int arg, char *args[]){if (arg < 2){return -1;}int port = atoi(args[1]);int st = socket(AF_INET, SOCK_STREAM, 0); //初始化socketint on = 1;if (setsockopt(st, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1){printf("setsockopt failed %s\n", strerror(errno));return EXIT_FAILURE;}struct sockaddr_in addr; // 定义一个IP地址结构memset(&addr, 0, sizeof(addr));addr.sin_family = AF_INET; // 将addr结构的属性定位为TCP/IP地址addr.sin_port = htons(port); // 将本地字节顺序转化为网络字节顺序addr.sin_addr.s_addr = htonl(INADDR_ANY); // INADDR_ANY代表这个server上所有的地址// 将ip与server程序绑定if (bind(st, (struct sockaddr *) &addr, sizeof(addr)) == -1){printf("bind failed %s\n", strerror(errno));return EXIT_FAILURE;}// server端开始listenif (listen(st, 20) == -1){printf("listen failed %s\n", strerror(errno));return EXIT_FAILURE;}//printf("listen success\n");char s[1024];int client_st = 0;struct sockaddr_in client_addr; // 表示client端的IP地址int i;for (i = 0; i < 5; i++){memset(&client_addr, 0, sizeof(client_addr));socklen_t len = sizeof(client_addr);// accept会阻塞，直到有客户端连接过来，accept返回client的socket描述符client_st = accept(st, (struct sockaddr*) &client_addr, &len);if (client_st == -1){printf("accept failed %s\n", strerror(errno));return EXIT_FAILURE;}printf("accept by %s\n", inet_ntoa(client_addr.sin_addr));while (1){memset(s, 0, sizeof(1024));int rc = recv(client_st, s, sizeof(s), 0);// 是阻塞调用，客户端也是一样if (rc > 0){printf("revc is %s\n", s);memset(s, 0, sizeof(s));read(STDIN_FILENO, s, sizeof(s));send(client_st, s, strlen(s), 0);} else{if (rc == 0){printf("client socket closed\n");}else{printf("recv failed %s\n", strerror(errno));}break;}}close(client_st);}close(st);return 0;}

makefile文件如下

.SUFFIXES: .c .oCC=gccASRCS=sock.cBSRCS=server.cAOBJS=$(ASRCS:.c=.o)BOBJS=$(BSRCS:.c=.o)AEXEC=clientBEXEC=serverall:$(AOBJS) $(BOBJS)$(CC) -o $(AEXEC) $(AOBJS)$(CC) -o $(BEXEC) $(BOBJS)@echo '-------------ok--------------'.c.o:$(CC) -Wall -g -o $@ -c $< clean:rm -f $(AOBJS)rm -f $(BOBJS)rm -f core*

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