网络编程9月3日

1，思维导图2，TCP通信

服务器端

#include<myhead.h>
#define JCHM 4514
#define IPDZ "192.168.0.113"
#define BACKLOG 5
int main(int argc,const char *argv[])
{int oldfd=socket(AF_INET,SOCK_STREAM,0);if(oldfd==-1){perror("socket");return -1;}printf("旧套接字创建成功\n");struct sockaddr_in sin = {.sin_family = AF_INET,.sin_port = htons(JCHM),.sin_addr.s_addr= inet_addr(IPDZ)};int sum1=bind(oldfd,(struct sockaddr *)&sin,sizeof(sin));if(sum1==-1){perror("bind");return -1;}printf("主机IP和端口号绑定成功\n");int sum2=listen(oldfd,BACKLOG);if(sum2==-1){perror("listen");return -1;}printf("监听客户端请求\n");int newfd;struct sockaddr_in cin;socklen_t cinlen=sizeof(cin);newfd = accept(oldfd,(struct sockaddr *)&cin,&cinlen);if(newfd==-1){perror("accept");return -1;}printf("%s:%d客户端发来请求\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));char buff[1024]="";while(1){int len = recv(newfd,buff,sizeof(buff),0);printf("客户端发来消息：%s\n",buff);if(len==0){printf("客户端已退出\n");break;}memset(buff,0,sizeof(buff));}close(newfd);close(oldfd);return 0;
}

客户端

#include<myhead.h>
#define JCHM 4514
#define IPDZ "192.168.0.113"
int main(int argc,const char *argv[])
{int oldfd=socket(AF_INET,SOCK_STREAM,0);if(oldfd==-1){perror("oldfd");return -1;}struct sockaddr_in cin = {.sin_family = AF_INET,.sin_port = htons(JCHM),.sin_addr.s_addr = inet_addr(IPDZ)};int sum = connect(oldfd,(struct sockaddr *)&cin,sizeof(cin));if(sum==-1){perror("connect");return -1;}printf("连接服务器成功\n");char buff[1024]="";while(1){memset(buff,0,sizeof(buff));fgets(buff,sizeof(buff),stdin);send(oldfd,buff,sizeof(buff),0);}close(oldfd);return 0;
}