package com;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Scanner;

public class ComFn {
	public static String bytesToHexString(byte[] src, int len){
        StringBuilder stringBuilder = new StringBuilder("");
        if (src == null || len <= 0) {
            return null;
        }
        for (int i = 0; i < len; i++) {
            int v = src[i] & 0xFF;
            String hv = Integer.toHexString(v).toUpperCase();
            if (hv.length() < 2) {
                stringBuilder.append(0);
            }
            stringBuilder.append(hv + " ");
        }
        return stringBuilder.toString();
    }
	
	public static byte[] hexStr2Byte(String hex) {
	    ByteBuffer bf = ByteBuffer.allocate(hex.length() / 3);
	    for (int i = 0; i<hex.length(); i++) {
	        String hexStr = hex.charAt(i++) + "";
	        hexStr += hex.charAt(i++);
	        hexStr += hex.charAt(i);
	        byte b = (byte) Integer.parseInt(hexStr.trim(), 16);
	        bf.put(b);
	    }
	    return bf.array();
	}
	
	public String GetCpuID() {
        try {
            Process process = Runtime.getRuntime().exec(new String[]{"wmic", "cpu", "get", "ProcessorId"});
            process.getOutputStream().close();
            @SuppressWarnings("resource")
			Scanner sc = new Scanner(process.getInputStream());
            @SuppressWarnings("unused")
			String property = sc.next();
            String serial = sc.next();
            System.out.println(serial);
            return serial;
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        return null;
    }
}