C/C++ 通过Socket 传输结构体

本质上socket无法传输结构体，我们只有将结构体装换为字节数组，或者是字符串格式来传输，到了服务端在强制类型转换一下即可，下面的代码分别提供原生写法与通过boost的实现两种，直接改改，可用于收集目标主机数据。

客户端:

#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib,"ws2_32.lib")

typedef struct Info
{
	char client_name[30];
	char buffer[1024];
}message;

message msg;

void GetSysInfo()
{
	SYSTEM_INFO sysInfo;
}

int main()
{
	WSADATA WSAData;
	SOCKET sock;

	WSAStartup(MAKEWORD(2, 0), &WSAData);
	sock = socket(AF_INET, SOCK_STREAM, 0);

	struct sockaddr_in ClientAddr;
	ClientAddr.sin_family = AF_INET;
	ClientAddr.sin_port = htons(15001);
	ClientAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

	connect(sock, (LPSOCKADDR)&ClientAddr, sizeof(ClientAddr));

	// 首先需要定义一个变量
	char snd_buf[1024] = { 0 };

	// 将数据拷贝到结构中
	strcpy(msg.client_name, "lyshark");
	strcpy(msg.buffer, "bbbbbb");

	// 发送字节序
	memcpy(snd_buf, &msg, sizeof(message));
	send(sock, snd_buf, sizeof(snd_buf), 0);

	closesocket(sock);
	WSACleanup();
	return 0;
}

服务端;

#include <stdio.h>
#include <winsock2.h>
#pragma comment(lib,"ws2_32.lib")
#define PORT 15001
#define ERROR 0
#define BUFFER_SIZE 1024

typedef struct Info
{
	char client_name[30];
	char buffer[1024];
}message;

int main()
{
	WSADATA WSAData;

	WSAStartup(MAKEWORD(2, 0), &WSAData);

	SOCKET sock;
	sock = socket(AF_INET, SOCK_STREAM, 0);

	struct sockaddr_in ServerAddr;
	ServerAddr.sin_family = AF_INET;
	ServerAddr.sin_port = htons(PORT);
	ServerAddr.sin_addr.s_addr = INADDR_ANY; 

	bind(sock, (LPSOCKADDR)&ServerAddr, sizeof(ServerAddr));
	listen(sock, 10);

	SOCKET msgsock;
	// 用于接收结构
	char buf[1024] = { 0 };

	msgsock = accept(sock, (LPSOCKADDR)0, (int *)0);

	recv(msgsock, buf, sizeof(buf), 0);
	// 接收到结构，强制类型转换
	message *msg = (message*)buf;

	printf("%s \n", msg->client_name);
	printf("%s \n", msg->buffer);

	closesocket(sock);
	WSACleanup();

	system("pause");
	return 0;
}