[网络协议]UDP传输结构体

结构体数据传输

//服务器
#include< stdio.h >
#include< string.h >
#include< winsock.h >
#include< windows.h >
#include <iostream>
#pragma comment( lib, "ws2_32.lib" )

#define PORT 2046
#define BACKLOG 10
#define TRUE 1
#define MAXDATASIZE 1000
using namespace std;
typedef struct GPS {
	float longitude;
	float latitude;
	float altitude;
	char WE;
	char NS;
	char CRC;
};
float ByteToFloat(char* byteArray)
{
	return *((float*)byteArray);
}
void main(void)
{
	int iServerSock;
	// int iClientSock;

	int addr_len;
	int numbytes;

	char buf[MAXDATASIZE];

	struct sockaddr_in ServerAddr;
	struct sockaddr_in ClientAddr;
	GPS info;
	WSADATA WSAData;
	if (WSAStartup(MAKEWORD(1, 1), &WSAData))
	{
		printf("initializationing error!\n");
		WSACleanup();
		exit(0);
	}

	iServerSock = socket(AF_INET, SOCK_DGRAM, 0);
	if (iServerSock == INVALID_SOCKET)
	{
		printf("创建套接字失败!\n");
		WSACleanup();
		exit(0);
	}


	ServerAddr.sin_family = AF_INET;
	ServerAddr.sin_port = htons(PORT);//监视的端口号
	ServerAddr.sin_addr.s_addr = INADDR_ANY;//本地IP
	memset(&(ServerAddr.sin_zero), 0, sizeof(ServerAddr.sin_zero));


	if (bind(iServerSock, (struct sockaddr *)&ServerAddr, sizeof(struct sockaddr)) == -1)
	{
		printf("bind调用失败!\n");
		WSACleanup();
		exit(0);
	}

	while (1) {
		addr_len = sizeof(struct sockaddr);
		numbytes = recvfrom(iServerSock, buf, MAXDATASIZE, 0, (struct sockaddr *) & ClientAddr, &addr_len);
		if (numbytes == -1)
		{
			printf("recvfrom调用失败!\n");
			WSACleanup();
			exit(0);
		}
		GPS info;
		printf("got packet from %s\n", inet_ntoa(ClientAddr.sin_addr));
		printf("packet is %d bytes long\n", numbytes);
		buf[numbytes] = '\0';
		memcpy(&info, buf, sizeof(buf) + 1);
		printf("longitude = %f, latitude = %f, altitude = %f, WE =%c， NS= %c, CRC = %c\n",
			info.longitude, info.latitude, info.altitude, info.WE, info.NS, info.CRC);
	}
	closesocket(iServerSock);
	WSACleanup();


}

#include< stdio.h >
#include< stdlib.h >
#include< windows.h >
#include< winsock.h >
#include< string.h >
#include <iostream>
#pragma comment( lib, "ws2_32.lib" )

#define PORT 2046
#define MAXDATASIZE 100
using namespace std;

typedef struct GPS {
	float longitude;
	float latitude;
	float altitude;
	char WE;
	char NS;
	char CRC;
};
void main(void)
{

	int iClientSock;
	struct sockaddr_in ServerAddr;
	GPS info;
	int numbytes;
	//char buf[100] = "hello world!";
	

	WSADATA WSAData;
	if (WSAStartup(MAKEWORD(1, 1), &WSAData))
	{
		printf("initializationing error!\n");
		WSACleanup();
		exit(0);
	}

	if ((iClientSock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
	{
		printf("创建套接字失败!\n");
		WSACleanup();
		exit(0);
	}

	ServerAddr.sin_family = AF_INET;
	ServerAddr.sin_port = htons(PORT);
	ServerAddr.sin_addr.s_addr = inet_addr("127.0.0.1");//记得换IP
	memset(&(ServerAddr.sin_zero), 0, sizeof(ServerAddr.sin_zero));
	while (1) 
	{
		cin >> info.longitude;
		cin >> info.latitude;
		cin >> info.altitude;
		cin >> info.WE;
		cin >> info.NS;
		cin >> info.CRC;
		char *buf = (char *)&info;
		numbytes = sendto(iClientSock, buf, 16, 0, (struct sockaddr *) & ServerAddr, sizeof(struct sockaddr));
	}
	if (numbytes == -1)
	{
		printf("sendto调用失败!\n");
		WSACleanup();
		exit(0);
	}

	printf("sent %d bytes to %s\n", numbytes, inet_ntoa(ServerAddr.sin_addr));
	closesocket(iClientSock);
	WSACleanup();
}