DAY1 网络编程（TCP客户端服务器）

作业：

        TCP客户端服务器。

server服务器代码：

#include <myhead.h>
#define  IP "192.168.110.52"
#define PORT 8886
#define BACKLOG 20
int main(int argc, const char *argv[])
{int oldfd=socket(AF_INET,SOCK_STREAM,0);//IPV4通信  TCP通信协议if(oldfd==-1){perror("socket");return -1;}//2.绑定IP和端口号struct sockaddr_in server={.sin_family=AF_INET,//IPV4.sin_port=htons(PORT),//端口号转为网络字节序.sin_addr.s_addr=inet_addr(IP),//IP};if(bind(oldfd,(struct sockaddr *)&server,sizeof(server))==-1){perror("bind");return -1;}//3.监听if(listen(oldfd,BACKLOG)==-1){perror("listen");return -1;   }//4.接收客户端连接请求创建新的描述符用于通讯struct sockaddr_in client;//接收客户端信息的结构体socklen_t client_len=sizeof(client);//计算出结构体大小int newfd;newfd =accept(oldfd,(struct sockaddr*)&client,&client_len);if(newfd==-1){perror("accept");return -1;}printf("%s发来连接请求\n",inet_ntoa(client.sin_addr));//5.循环收发信息char buff[1024];while(1){memset(buff,0,sizeof(buff));int len=recv(newfd,buff,sizeof(buff),0);//0:非阻塞 MSG_DONTWAITif(len==0){printf("客户端断开连接\n");break;}printf("%s\n",buff);strcat(buff,"520");send(newfd,buff,sizeof(buff),0);}close(oldfd);close(newfd);return 0;
}

client客户端代码：

#include <myhead.h>
#define IP "192.168.110.52"
#define PORT 8886
int main(int argc, const char *argv[])
{int oldfd=socket(AF_INET,SOCK_STREAM,0);if(oldfd==-1){perror("socket");return -1;}struct sockaddr_in server={.sin_family=AF_INET,.sin_port=htons(PORT),.sin_addr.s_addr=inet_addr(IP),};if(connect(oldfd,(struct sockaddr *)&server,sizeof(server))==-1){perror("connect");return -1;}char buff[1024];while(1){fgets(buff,sizeof(buff),stdin);buff[strlen(buff)-1]='\0';send(oldfd,buff,sizeof(buff),0);int len=recv(oldfd,buff,sizeof(buff),0);if(len==0){printf("服务器意外退出\n");break;}printf("接收服务器：%s\n",buff);}close(oldfd);return 0;
}

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