网编 TCP的服务器客户端_在线tcp服务器

1.TCP的服务器客户端

1）服务器

#include <myhead.h>
#define ERR_MSG(msg) do{\
	fprintf(stderr,"__%d__",__LINE__);\
	perror(msg);\
	}while(0)
 
#define IP "192.168.10.102"
 
int main(int argc, const char *argv[])
{
	int sfd = socket(AF_INET,SOCK_STREAM,0);
	if(sfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}
 
	//允许端口快速被重用
	int reuse = 1;
	if(setsockopt(sfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) <0)
	{
		ERR_MSG("setsockopt");
		return -1;
	
	}
	printf("允许端口快速被重用成功\n");
 
	struct sockaddr_in sin;
	sin.sin_family      = AF_INET;
	sin.sin_port        = htons(8888);
	sin.sin_addr.s_addr = inet_addr(IP);
 
	if(bind(sfd,(struct sockaddr *)&sin,sizeof(sin))<0)
	{
		ERR_MSG("bind");
		return -1;
	}
	printf("bind success\n");
 
	if(listen(sfd,128) < 0)
	{
		ERR_MSG("listen");
		return -1;
	}
	printf("listen success\n");
 
	struct sockaddr_in cin;
	socklen_t addrlen = sizeof(cin);
 
	int newfd = accept(sfd,(struct sockaddr*)&cin,&addrlen);
	if(newfd <0)
	{
		ERR_MSG("accept");
		return -1;
	}
 
	printf("[%s : %d] newfd = %d 客户端连接成功\n",\
			inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
 
	char buf[128] = "";
	ssize_t res = 0;
	while(1)
	{
		bzero(buf,sizeof(buf));
 
		res = recv(newfd,buf,sizeof(buf),0);
		if(res < 0)
		{
			ERR_MSG("recv");
			return -1;
		}
		else if(0 == res)
		{
			printf("[%s ; %d] newfd = %d 客户端下线\n",\
					inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd);
			break;
		}
		printf("[%s ; %d] newfd=%d ; %s\n",\
				inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),newfd,buf);
 
		strcat(buf,"Q_A_Q");
		if(send(newfd,buf,sizeof(buf),0)<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("发送成功\n");
	
	}
 
	close(newfd);
 
	if(close(sfd)<0)
	{
		ERR_MSG("close");
		return -1;
	}
 
	return 0;
}

2）客户端

#include <myhead.h>
 
#define ERR_MSG(msg) do { fprintf(stderr,"__%d__",__LINE__);perror(msg);}while(0)
 
#define IP "192.168.10.102"     //ifconfig查看本机IP
#define PORT 8888
 
int main(int argc, const char *argv[])
{
	//printf("%d %s %s\n",__LINE,__func,__FILE__);
 
	//创建流式套接字
	int cfd = socket(AF_INET,SOCK_STREAM,0);
	if(cfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}
 
	int reuse = 1;
	if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) <0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
	printf("允许端口快速被重用成功\n");
 
 
	//填充服务器的地址信息结构体 AF_INET:man 7 ip
	//填充服务器的地址信息结构体，给connect函数使用
	//要连接哪个服务器，就填充哪个服务器绑定的地址信息
	
	struct sockaddr_in sin;
	sin.sin_family     = AF_INET;        //必须填AF_INET
	sin.sin_port       = htons(PORT);    //端口号的网络字节序，1024-49151
	sin.sin_addr.s_addr= inet_addr(IP);  //本机IP的网络字节序
 
	if(connect(cfd,(struct sockaddr *)&sin,sizeof(sin))<0)
	{
		ERR_MSG("connect");
		return -1;
	}
	printf("connect success\n");
 
	char buf[128] = "";
	ssize_t res = 0;
	while(1)
	{
		bzero(buf,sizeof(buf));
		
		//发送数据
		printf("请输入：");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]=0;
		
		//对方接收多少个字节，发送多少个字节
		if(send(cfd,buf,sizeof(buf),0) <0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("发送成功\n");
 
		bzero(buf,sizeof(buf));
		//接收数据
		res = recv(cfd,buf,sizeof(buf),0);
		if(res < 0)
		{
			ERR_MSG("recv");
			return -1;
		
		}
		else if(0 == res)
		{
			printf("cfd = %d 服务器下线\n",cfd);
			break;
		}
		printf("cfd=%d : %s\n",cfd,buf);
 
	}
 
	//关闭文件描述符
	if(close(cfd)<0)
	{
		ERR_MSG("close");
		return -1;
	}
 
	return 0;
}
 

运行结果：

2. 自行编写一个客户端代码，能够操作红色手臂移动到16度

#include <myhead.h>
 
#define ERR_MSG(msg) do { fprintf(stderr,"__%d__",__LINE__);perror(msg);}while(0)
 
#define IP "192.168.10.135"     //ifconfig查看本机IP
#define PORT 8888
 
int main(int argc, const char *argv[])
{
	
	int cfd = socket(AF_INET,SOCK_STREAM,0);
	if(cfd < 0)
	{
		ERR_MSG("socket");
		return -1;
	}
 
	int reuse = 1;
	if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse)) <0)
	{
		ERR_MSG("setsockopt");
		return -1;
	}
	printf("允许端口快速被重用成功\n");
 
	
	struct sockaddr_in sin;
	sin.sin_family     = AF_INET;        //必须填AF_INET
	sin.sin_port       = htons(PORT);    //端口号的网络字节序，1024-49151
	sin.sin_addr.s_addr= inet_addr(IP);  //本机IP的网络字节序
 
	if(connect(cfd,(struct sockaddr *)&sin,sizeof(sin))<0)
	{
		ERR_MSG("connect");
		return -1;
	}
	printf("connect success\n");
 
 	char buf[5];
 
	while(1)
	{
		printf("请输入：");
		for(int i=0;i<5;i++)
		{
			scanf("%hhx",&buf[i]);
		}
 
		if((send(cfd,buf,sizeof(buf),0))<0)
		{
			ERR_MSG("send");
			return -1;
		}
		printf("发送成功\n");
	}
		
	//关闭文件描述符
	if(close(cfd)<0)
	{
		ERR_MSG("close");
		return -1;
	}
 
	return 0;
}

 运行结果：