socket服务器编程1：server端将接收到的字符串转换为大写字母并输出
1 //server.hpp 2 3 */ 4 #ifndef _SOCKET_HPP_ 5 #define _SOCKET_HPP_ 6 7 #include <sys/socket.h> 8 #include <sys/types.h> 9 #include <arpa/inet.h> 10 #include <string.h> 11 #include <ctype.h> 12 13 #endif 14 15 /*=============================================================== 16 * Copyright(C) 2020 Burgess Fan aLL rights reserved. 17 * 18 * 文件名称：server.cpp 19 * 创 建 者：Burgess 20 * 创建日期：2020年05月14日 21 ================================================================ 22 */ 23 24 #include <stdio.h> 25 #include <unistd.h> 26 #include <stdlib.h> 27 #include "socket.hpp" 28 29 #define SERV_PORT 8000 30 #define SERV_IP "192.168.35.139" 31 32 #define handle_err(msg) \ 33 do{perror(msg);exit(EXIT_FAILURE);}while(0) 34 #define MAX_SOCK_QUEUE 128 35 #define BUFSIZE 128 36 37 int main() 38 { 39 int serv_fd,c_fd; 40 struct sockaddr_in serv_addr,c_addr; 41 socklen_t c_addr_len; 42 int n,i; 43 char r_buf[BUFSIZE]; 44 //1.建立套接字socket() 45 serv_fd=socket(AF_INET,SOCK_STREAM,0); 46 if(serv_fd<0) 47 { 48 handle_err("socket error"); 49 } 50 serv_addr.sin_family=AF_INET; 51 serv_addr.sin_port=htons(SERV_PORT);//host to network long 52 serv_addr.sin_addr.s_addr=htons(INADDR_ANY); 53 //serv_addr.sin_addr.s_addr=inet_addr(SERV_IP); 54 //2.绑定IP端口号bind() 55 int ret=bind(serv_fd,(struct sockaddr*)&serv_addr,sizeof(serv_addr)); 56 if(ret<0) 57 { 58 handle_err("bind error"); 59 } 60 //3.指定最大同时发起连接数 61 int listen_ret=listen(serv_fd,MAX_SOCK_QUEUE); 62 if(listen_ret<0) 63 { 64 handle_err("listen_ret"); 65 } 66 c_addr_len=sizeof(c_addr); 67 //4.accept阻塞等待客户端发起连接 68 c_fd=accept(serv_fd,(struct sockaddr*)&c_addr,&c_addr_len); 69 memset(r_buf,0,sizeof(BUFSIZE)); 70 //5.read() 71 while(1) 72 { 73 n=read(c_fd,r_buf,sizeof(r_buf)); 74 //6.小写字母变为大写字母 75 for(i=0;i<n;++i) 76 { 77 r_buf[i]=toupper(r_buf[i]); 78 } 79 //7.write() 80 write(c_fd,r_buf,n); 81 printf("%s",r_buf); 82 } 83 close(serv_fd); 84 close(c_fd); 85 }
