网络第2天

使用TCP客户端请求机械臂服务器，对机械臂进行控制

使用a d s w控制

#include <myhead.h>
#define IP "192.168.124.7"
#define PORT 8888

int main(int argc, const char *argv[])
{
	
	//创建socket文件
	int cfd=socket(AF_INET,SOCK_STREAM,0);
	if(cfd<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("cfd create success\n");

	//绑定服务器的IP和端口号
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	
	socklen_t len=sizeof(sin);
	if(connect(cfd,(struct sockaddr*)&sin,len)<0){
		ERR_MSG("connect");
		return -1;
	}

	//把服务器的IP和端口提出来
	printf("连接 %s:%d 成功\n",inet_ntoa(sin.sin_addr),\
			ntohs(sin.sin_port));

	ssize_t res=0;
	char red[5]={0xff,0x02,0x00,-90,0xff};//red
	unsigned char blue[5]={0xff,0x02,0x01,0,0xff}; //bluei
	char c;
while(1){
	c=getchar();
	getchar();
	switch(c){
		case 'w': //red++
			red[3]+=5;
			if(red[3]>90){
				red[3]=90;
			}
			break;
		case 's': //red--
			red[3]-=5;
			if(red[3]<-90){
				red[3]=-90;
			}
			break;
		case 'a': //blue++
			blue[3]+=5;
			if(blue[3]>180){
				blue[3]=180;
			}
			break;
		case 'd': //blue--
			blue[3]-=5;
			if(blue[3]<0){
				blue[3]=0;
			}
			break;
		default:
			continue;
	}
	
	if(send(cfd,red,sizeof(red),0)<0){
		ERR_MSG("send");
		return -1;
	}
	printf("red send success\n");

//	sleep(1);

	if(send(cfd,blue,sizeof(blue),0)<0){
		ERR_MSG("send");
		return -1;
	}
	printf("blue send success\n");

}
	
	//关闭所有文件描述符
	close(cfd);
	return 0;
}

TCP服务器与客户端连接、通信

//TCP服务器
#include <myhead.h>
#define IP "192.168.124.74"
#define PORT 6666

int main(int argc, const char *argv[])
{
	
	//创建socket文件
	int sfd=socket(AF_INET,SOCK_STREAM,0);
	if(sfd<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("sfd create success\n");

	//绑定服务器的IP和端口号
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0){
		ERR_MSG("bind");
		return -1;
	}
	printf("bind IP&PORT success\n");

	//将文件转为被动监听模式
	if(listen(sfd,128)<0){
		ERR_MSG("listen");
		return -1;
	}
	printf("listen success\n");

	//用连接成功的客户端的信息生成accept文件
	struct sockaddr_in cin;
	socklen_t len=sizeof(cin);

	int newfd=accept(sfd,(struct sockaddr*)&cin,&len);
	if(newfd<0){
		ERR_MSG("accept");
		return -1;
	}

	//把客户端的IP和端口提出来
	printf("newfd:%d %s:%d 连接成功\n",newfd\
			,inet_ntoa(cin.sin_addr),ntohs(cin.sin_port));

	ssize_t res=0;
	char buf[128]="";

	while(1){
		bzero(buf,sizeof(buf));
		//接收客户端数据
		res=recv(newfd,&buf,sizeof(buf),0);
		if(res<0){
			ERR_MSG("recv");
			break;
		}else if(res==0){
			printf("客户端下线\n");
			break;
		}
		printf("[%s:%d]:%s\n",\
				inet_ntoa(cin.sin_addr),\
				ntohs(cin.sin_port),buf);

		//向客户端发送数据
		//要发送的数据
		strcat(buf,"^-^");
		res=send(newfd,buf,sizeof(buf),0);
		if(res<0){
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");
	}

	//关闭所有文件描述符
	close(sfd);
	close(newfd);
	return 0;
}

//TCP客户端
#include <myhead.h>
#define IP "192.168.124.73"
#define PORT 6666

int main(int argc, const char *argv[])
{
	
	//创建socket文件
	int cfd=socket(AF_INET,SOCK_STREAM,0);
	if(cfd<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("cfd create success\n");

	//绑定服务器的IP和端口号
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	
	socklen_t len=sizeof(sin);
	if(connect(cfd,(struct sockaddr*)&sin,len)<0){
		ERR_MSG("connect");
		return -1;
	}

	//把服务器的IP和端口提出来
	printf("连接 %s:%d 成功\n",inet_ntoa(sin.sin_addr),\
			ntohs(sin.sin_port));

	ssize_t res=0;
	char buf[128]="";

	while(1){
		bzero(buf,sizeof(buf));
	
		//向服务器发送数据
		//要发送的数据
		printf("请输入要发送的信息>>>");
		fgets(buf,sizeof(buf),stdin);
		buf[strlen(buf)-1]='\0';

		res=send(cfd,buf,sizeof(buf),0);
		if(res<0){
			ERR_MSG("send");
			return -1;
		}
		printf("send success\n");

	//接收客户端数据
		res=recv(cfd,&buf,sizeof(buf),0);
		if(res<0){
			ERR_MSG("recv");
			break;
		}else if(res==0){
			printf("服务器下线\n");
			break;
		}
		printf("[%s:%d]:%s\n",\
				inet_ntoa(sin.sin_addr),\
				ntohs(sin.sin_port),buf);

	}

	//关闭所有文件描述符
	close(cfd);
	return 0;
}

UDP服务器与客户端连接、通信

//UDP服务器
#include <myhead.h>

#define PORT 6666
#define IP "192.168.124.74"
int main(int argc, const char *argv[])
{
	//创建套接字
	int sfd=socket(AF_INET,SOCK_DGRAM,0);
	if(sfd<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("create socket success\n");
	
	//绑定服务器地址信息
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	
	if(bind(sfd,(struct sockaddr*)&sin,sizeof(sin))<0){
		ERR_MSG("bind");
		return -1;
	}
	printf("bind sockaddr success\n");

	ssize_t res=0;
	char buf[128]="";
	struct sockaddr_in cin;
	socklen_t len=sizeof(cin);
	while(1){
		bzero(buf,sizeof(buf));
		//接收客户端数据
	res=recvfrom(sfd,buf,sizeof(buf),0,\
			(struct sockaddr*)&cin,&len);
	if(res<0){
		ERR_MSG("recvfrom");
		return -1;
	}
	printf("[%s:%d]:%s\n",inet_ntoa(cin.sin_addr),ntohs(cin.sin_port),buf);

	//向客户端发送数据
	strcat(buf,"\t--get");
	
	res=sendto(sfd,buf,sizeof(buf),0,(struct sockaddr*)&cin,sizeof(cin));
	if(res<0){
		ERR_MSG("sendto");
		return -1;
	}
	printf("send to %s:%d success\n",inet_ntoa(cin.sin_addr),\
			ntohs(cin.sin_port));

	}
	close(sfd);

	return 0;
}

//UDP客户端
#include <myhead.h>
#define IP "192.168.124.74"
#define PORT 6666

int main(int argc, const char *argv[])
{
	//创建套接字文件
	int cfd=socket(AF_INET,SOCK_DGRAM,0);
	if(cfd<0){
		ERR_MSG("socket");
		return -1;
	}
	printf("socket create success\n");

	//填充地址信息体
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);

	char str[128];
	ssize_t res=0;
	struct sockaddr_in recvin;
	socklen_t len=sizeof(recvin);

	while(1){
		bzero(str,sizeof(str));
		printf("请输入想要发送的内容>>>");
		scanf("%s",str);
		getchar();
		//向服务器发送
		res=sendto(cfd,str,sizeof(str),0,\
				(struct sockaddr*)&sin,sizeof(sin));
		if(res<0){
			ERR_MSG("sendto");
			return -1;
		}
		printf("sendto %s:%d success\n",\
				inet_ntoa(sin.sin_addr),ntohs(sin.sin_port));

		//从服务器接收
		res=recvfrom(cfd,str,sizeof(str),0,\
				(struct sockaddr*)&recvin,&len);
		if(res<0){
			ERR_MSG("recvfrom");
			return -1;
		}
		printf("[%s:%d]: %s\n",inet_ntoa(recvin.sin_addr),\
				ntohs(recvin.sin_port),str);

	}
	//关闭文件
	close(cfd);

	return 0;
}