How to get cpu_ID from C++ code?

// WMI.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"


#include <array>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
#include<conio.h>
std::string GetProcessorId() {
	std::array<int, 4> cpuInfo;
	__cpuid(cpuInfo.data(), 1);
	std::ostringstream buffer;
	buffer
		<< std::uppercase << std::hex << std::setfill('0')
		<< std::setw(8) << cpuInfo.at(3)
		<< std::setw(8) << cpuInfo.at(0);
	return buffer.str();
}

int main(void) {
	std::cout << "Processor Serial number is:  ";
		std::cout<<GetProcessorId() << std::endl;
	_getch();
	return 0;
}