[网络协议]基于TCP服务端从零开始编写

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include<iostream>
#include<WinSock2.h>
#pragma comment(lib,"ws2_32.lib")

using namespace std;

int main() {
	WSADATA wsaData;
	WORD wsaVersion = MAKEWORD(2, 0);
	WSAStartup(wsaVersion, &wsaData);

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

	sockaddr_in addr;
	addr.sin_family = AF_INET;
	addr.sin_port = htons(9999);
	addr.sin_addr.S_un.S_addr = INADDR_ANY;

	bind(serverSock, (sockaddr*)&addr, sizeof(addr));

	listen(serverSock, 100);

	cout << "tcp server is listening at port 9999:" << endl;

	SOCKET clientSock;
	sockaddr_in clientaddr;
	int len = sizeof(sockaddr_in);

	while (true) {
		clientSock = accept(serverSock, (sockaddr*)&clientaddr, &len);

		if (INVALID_SOCKET != clientSock) {
			cout << "client:" << inet_ntoa(clientaddr.sin_addr) <<
				    " "<<clientaddr.sin_port<<" is connected!" << endl;

			closesocket(clientSock);
		}
	}

	closesocket(serverSock);
	WSACleanup();

	return 0;
}

运行程序，然后win+r输入cmd，打开命令行窗口，输入

查看电脑ip地址
win+r输入cmd，打开命令行窗口，输入ipconfig 命令