WinSock之協議查詢

#define _WINSOCK_DEPRECATED_NO_WARNINGS
#include "WinSock2.h"
#include "iostream"
#pragma comment(lib,"ws2_32.lib")  //鏈接WinSock導入庫
using namespace std;
int main(int argc, char **argv) {
	WSADATA wsaData;
	WORD wVersionRequested = MAKEWORD(2, 2);   //調用2.2版本
	if (WSAStartup(wVersionRequested, &wsaData) != 0) {   //加載WinSock動態鏈接庫
		cout << "加載WinSock DLL失敗！\n";
		return 0;
	}
	struct protoent *pProto;
	for (int i = 1; i <= 256; i++) {
		if ((pProto = getprotobynumber(i)) != NULL) {   //協議查詢
			cout << "協議名：" << pProto->p_name << endl;
			cout << "協議號：" << pProto->p_proto << endl;
		}
	}
	
	WSACleanup();
	return 0;
}