I need to call this python script in NodeJs.

Read.py

#!/usr/bin/env python

# -*- coding: utf8 -*-



import RPi.GPIO as GPIO

import MFRC522

import signal



continue_reading = True



# Capture SIGINT for cleanup when the script is aborted

def end_read(signal,frame):

    global continue_reading

    print Ctrl+C captured, ending read.

    continue_reading = False

    GPIO.cleanup()



# Hook the SIGINT

signal.signal(signal.SIGINT, end_read)



# Create an object of the class MFRC522

MIFAREReader = MFRC522.MFRC522()



# Welcome message

print Welcome to the MFRC522 data read example

print Press Ctrl-C to stop.



# This loop keeps checking for chips. If one is near it will get the UID and authenticate

while continue_reading:



    # Scan for cards    

    (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)



    # If a card is found

    if status == MIFAREReader.MI_OK:

    # Get the UID of the card

    (status,uid) = MIFAREReader.MFRC522_Anticoll()



    # If we have the UID, continue

    if status == MIFAREReader.MI_OK:



        # Print UID

        print Card read UID: +str(uid[0])+,+str(uid[1])+,+str(uid[2])+,+str(uid[3])



        # This is the default key for authentication

        key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]



        # Select the scanned tag

        MIFAREReader.MFRC522_SelectTag(uid)



        # Authenticate

        status = MIFAREReader.MFRC522_Auth(MIFAREReader.PICC_AUTHENT1A, 8, key, uid)



        # Check if authenticated

        if status == MIFAREReader.MI_OK:

            MIFAREReader.MFRC522_Read(8)

            MIFAREReader.MFRC522_StopCrypto1()

        else:

            print Authentication error

I used python-shell, here is the NodeJs code for that

Test.js

var PythonShell = require('python-shell');



var options = {

scriptPath: '/home/pi/gpio-admin/MFRC522-python/'

};

var pyshell = new PythonShell('Read.py',options);





pyshell.on('message', function (message) {



    console.log(message);

});

But when I ran this code I didn't see anything in Node side. I think problem occurs when python script comes to this level.

   (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)

Because I just ran with while loop which has only print statement then it works. After that I tried another way to achieve this. But I got same problem which I have with above.Here is another method

AltTest.js

var python = require('child_process').spawn(

 'python',

 // second argument is array of parameters, e.g.:

 [/home/pi/gpio-admin/MFRC522-python/Read.py]

 );

 var output = ;

 python.stdout.on('data', function(){ 



    output += data ;

    console.log(data);

});

 python.on('close', function(code){ 



   console.log(Here you are there...);

 });

Any help would be appreciated