12.18

#include 
#define PORT 8888
#define IP "192.168.125.86"
int main(int argc, const char *argv[])
{
	//1.创建套接字
	int cfd=-1;
	if((cfd=socket(AF_INET,SOCK_STREAM,0))==-1)
	{
		perror("socket error");
		return -1;
	}
	//1.1端口号快速重用
	int reuse=1;
	if(setsockopt(cfd,SOL_SOCKET,SO_REUSEADDR,&reuse,sizeof(reuse))==-1)
	{
		perror("setsockopt error");
		return -1;
	}
	//2.链接服务端
	struct sockaddr_in sin;
	sin.sin_family=AF_INET;
	sin.sin_port=htons(PORT);
	sin.sin_addr.s_addr=inet_addr(IP);
	if(connect(cfd,(struct sockaddr*)&sin,sizeof(sin))==-1)
	{
		perror("connect error");
		return -1;
	}
	//3.收发数据
	char rbuf[5]={0xff,0x02,0x00,0x00,0xff};
	send(cfd,rbuf,sizeof(rbuf),0);
	unsigned char bbuf[5]={0xff,0x02,0x01,0x00,0xff};
	send(cfd,bbuf,sizeof(bbuf),0);
	char value=0;
	while(1)
	{
		value=getchar();
		switch(value)
		{
		//通过w(红色臂角度增大)a
		case 'w':
		case 'W':
			{
				rbuf[3]+=2;
				if(rbuf[3]>=90)
				{
					rbuf[3]=90;
				}
				send(cfd,rbuf,sizeof(rbuf),0);
			}
			break;
		//s（红色臂角度减小）
		case 's':
		case 'S':
			{
				rbuf[3]-=2;
				if(rbuf[3]<=-90)
				{
					rbuf[3]=-90;
				}
				send(cfd,rbuf,sizeof(rbuf),0);
			}
			break;
		//d（蓝色臂角度增大）
		case 'D':
		case 'd':
			{
				bbuf[3]+=2;
				if(bbuf[3]>=180)
				{
					bbuf[3]=180;
				}
				send(cfd,bbuf,sizeof(bbuf),0);

			}
			break;
		//a（蓝色臂角度减小）
		case 'A':
		case 'a':
			{
				if(bbuf[3]<=2)
				{
					bbuf[3]=0;
				}
				else
				{
					bbuf[3]-=2;
				}
				send(cfd,bbuf,sizeof(bbuf),0);

			}
			break;
		}
	}
	//4.关闭文件
	close(cfd);
	return 0;
}