\qquad一個簡單的客戶端/服務端通信程序。
\qquad服務端：將客戶端上傳的字符串，改為大寫字符串，并且顯示客戶端的IP和端口號。

#include<stdio.h> #include<unistd.h> #include<sys/socket.h> #include<stdlib.h> #include<ctype.h> #include<arpa/inet.h>#define SERV_PORT 6666 int main() {int lfd,cfd;struct sockaddr_in serv_addr,clie_addr;socklen_t clie_addr_len,clie_IP_len;char buf[BUFSIZ],clie_IP[BUFSIZ];int n,ret;lfd = socket(AF_INET,SOCK_STREAM,0);if(lfd==-1){perror("socket error");exit(1);}serv_addr.sin_family = AF_INET;serv_addr.sin_port = htons(SERV_PORT);serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);ret = bind(lfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr));if(ret==-1){perror("bind error");exit(1);} ret = listen(lfd,128);if(ret==-1){perror("listen error");exit(1);}clie_addr_len = sizeof(clie_addr);cfd = accept(lfd,(struct sockaddr *)&clie_addr,&clie_addr_len);if(cfd==-1){perror("accept error");exit(1);}printf("client IP:%s,client port:%d\n",inet_ntop(AF_INET,&clie_addr.sin_addr.s_addr,clie_IP,sizeof(clie_IP)),ntohs(clie_addr.sin_port));while(1){n = read(cfd,buf,sizeof(buf));for(int i=0;i<n;i++){buf[i] = toupper(buf[i]);}write(cfd,buf,n);}close(lfd);close(cfd);return 0; }

\qquad客戶端：將字符串上傳到服務端

#include <stdio.h> #include<unistd.h> #include<stdlib.h> #include<sys/socket.h> #include<arpa/inet.h> #include<string.h> #define SERV_IP "192.168.0.2" #define SERV_PORT 6666 int main() {int cfd;struct sockaddr_in serv_addr;socklen_t serv_addr_len;char buf[BUFSIZ];int n;cfd = socket(AF_INET,SOCK_STREAM,0);memset(&serv_addr,0,sizeof(serv_addr)); serv_addr.sin_family = AF_INET;serv_addr.sin_port = htons(SERV_PORT);inet_pton(AF_INET,SERV_IP,&serv_addr.sin_addr.s_addr);connect(cfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr));while(1){fgets(buf,sizeof(buf),stdin);write(cfd,buf,strlen(buf));n = read(cfd,buf,sizeof(buf));write(STDOUT_FILENO,buf,n);} close(cfd);return 0; } 創作挑戰賽新人創作獎勵來咯，堅持創作打卡瓜分現金大獎

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