以tcp通信记录一下简单的收发包的一种方式（主要目的在于使用串口收发一组数据）

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可能有时候会涉及到使用串口或其他形式发送一组数据的时候，最近正好碰到，所以用这种方式简单的实现了一下，没有中间校验环节，也没有丢包重发的部分，很简单的实现，不知道会不会有什么问题出现或者不严谨的地方，另外，Linux下一切皆文件，串口的读写形式也是一样的，所以这儿用tcp测试，因为不需要用硬件测试，只需要虚拟机就能测试

client.c 

​
#include <stdlib.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>

int main(int argc, char **argv)
{
	int cfd,i;
	int recbyte;
	int sin_size;
	unsigned char buffer[10] = {0};

	struct sockaddr_in s_add, c_add;
	unsigned short portnum = 0x8888;

	printf("Hello,welcome to client!\r\n");

	if(argc != 2)
	{
			printf("usage: echo ip\n");
			return -1;
	}

	cfd = socket(AF_INET, SOCK_STREAM, 0);
	if(-1 == cfd)
	{
			printf("socket fail ! \r\n");
			return -1;
	}

	printf("socket ok !\r\n");

	bzero(&s_add,sizeof(struct sockaddr_in));
	s_add.sin_family=AF_INET;
	s_add.sin_addr.s_addr= inet_addr(argv[1]);
	s_add.sin_port=htons(portnum);
	printf("s_addr = %#x ,port : %#x\r\n",s_add.sin_addr.s_addr,s_add.sin_port);

	if(-1 == connect(cfd,(struct sockaddr *)(&s_add), sizeof(struct sockaddr)))
	{
			printf("connect fail !\r\n");
			return -1;
	}

	printf("connect ok !\r\n");

	while(1)
	{
		if(-1 == (recbyte = read(cfd, &buffer[0], 1)))
		{
				printf("read data fail !\r\n");
				return -1;
		}
		if(buffer[0] == 0x0a){
			for(i=0;i<8;i++){
				if(-1 == (recbyte = read(cfd, &buffer[i+1], 1)))
				{
						printf("read data fail !\r\n");
						return -1;
				}

				printf("read ok\r\nREC:\r\n");
			}

			if(-1 == (recbyte = read(cfd, &buffer[9], 1)))
			{
					printf("read data fail !\r\n");
					return -1;
			}
			if(buffer[9] == 0x0d)
			{
				printf("%d\r\n",buffer[1]);
				printf("%d\r\n",buffer[2]);
				printf("%d\r\n",buffer[3]);
				printf("%d\r\n",buffer[4]);
				printf("%d\r\n",buffer[5]);
				printf("%d\r\n",buffer[6]);
				printf("%d\r\n",buffer[7]);
				printf("%d\r\n",buffer[8]);
			}
			else
				memset(buffer, 0, strlen(buffer));

		}
		
	}

	close(cfd);

	return 0;

}

​

server.c

#include <stdlib.h>
#include <sys/types.h>
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>

int main()
{
	int sfp, nfp, num = 0;
	struct sockaddr_in s_add,c_add;
	int sin_size;
	unsigned short portnum=0x8888;

	char buffer[10] = {0};
	buffer[0] = 0x0a;
	buffer[1] = 0x01;
	buffer[2] = 0x02;
	buffer[3] = 0x03;
	buffer[4] = 0x04;
	buffer[5] = 0x05;
	buffer[6] = 0x06;
	buffer[7] = 0x07;
	buffer[8] = 0x08;
	buffer[9] = 0x0d;

	printf("Hello,welcome to my server !\r\n");

	sfp = socket(AF_INET, SOCK_STREAM, 0);
	if(-1 == sfp)
	{
			printf("socket fail ! \r\n");
			return -1;
	}

	printf("socket ok !\r\n");

	bzero(&s_add,sizeof(struct sockaddr_in));
	s_add.sin_family=AF_INET;
	s_add.sin_addr.s_addr=htonl(INADDR_ANY);
	s_add.sin_port=htons(portnum);

	if(-1 == bind(sfp,(struct sockaddr *)(&s_add), sizeof(struct sockaddr)))
	{
			printf("bind fail !\r\n");
			return -1;
	}

	printf("bind ok !\r\n");

	if(-1 == listen(sfp,5))
	{
			printf("listen fail !\r\n");
			return -1;
	}

	printf("listen ok\r\n");



		sin_size = sizeof(struct sockaddr_in);

		nfp = accept(sfp, (struct sockaddr *)(&c_add), &sin_size);
		if(-1 == nfp)
		{
				printf("accept fail !\r\n");
				return -1;
		}

		printf("accept ok!\r\nServer start get connect from %#x : %#x\r\n", 
								ntohl(c_add.sin_addr.s_addr), ntohs(c_add.sin_port));
		while(1)
		{

				send(nfp, buffer, strlen(buffer), 0);
				//usleep(500000);
		}


		close(nfp);


	close(sfp);

	return 0;
}