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;
}