json - How to pass value of object to new global variable in JavaScript -

-

i have written program run node.js server interact python script (source: https://github.com/extrabacon/python-shell), sends data script , receieves returned value. returned (message) (in pyshell.on) json, appears local function passed in, use data elsewhere in program outside function.

being new javascript tried set ret_val = message; no avail, have tried changing type (python side) string (still no success), , converting json string , parsing ret_val (as now) ret_val = json.parse(json.stringify(message));. unfortunately none of these methods work, ret_val remains undefined, despite message containing data need object (checked using typeof). know either correct way copy contents of message variable ret_val later returned, or possibly correct way message data if using module incorrectly.

see below logs

update: full script containing issue, occurs in function run_py_script when setting ret_val.

var express = require('express'); var router = express.router(); var pythonshell = require('python-shell');  var options = {     mode: 'json' };  var rain_data;  function run_py_script(data, callback){     var pyshell = new pythonshell('dummy.py', options);     var ret_val;     pyshell.send("dummy data"); // change data      pyshell.on('message', function(message){         console.log(message);         rev_val = message;         //console.log(ret_val["willcollide"]);     });      pyshell.end(function(err){         if (err) {             console.log("hi");         }         return err ? callback(null) : callback(null, ret_val);     });  }  /* rain_track data. */  router.get('/', function(req, res, next) {      run_py_script(null, function(err, rain_data) {         console.log(err);         console.log(rain_data);         if (err){ console.log("error in python script" ); return res.json(null); }         if (rain_data == null){             console.log("error: data null or undefined");         }         res.json(rain_data);     }) });  module.exports = router;

logs:

{ willcollide: 1, time: 6000, strength: 'na' } null undefined error: data null or undefined /rain_track 200 62.778 ms - -


Comments

Post a Comment

Popular posts from this blog

magento2 - Magento 2 admin grid add filter to collection -

-
i created grid in admin xml ui components. need filter collection via url parameter , dont know how achieve that. tried inject requestinterface collection, filter didnt work. di.xml <virtualtype name="slidelistingdataprovider" type="magento\framework\view\element\uicomponent\dataprovider\dataprovider"> <arguments> <argument name="collection" xsi:type="object" shared="false">xxx\xxx\model\resourcemodel\grid\slide\collection</argument> <argument name="filterpool" xsi:type="object" shared="false">slidelistingfilterpool</argument> <!-- define new object filters --> </arguments> </virtualtype> <virtualtype name="slidelistingfilterpool" type="magento\framework\view\element\uicomponent\dataprovider\filterpool"> <arguments> <argument name="applier...
Read more

Android volley - avoid multiple requests of the same kind to the server? -

-
i using volley upload list of images server. happens within service. once image uploaded remove list. problem arises when internet connection breaks. when internet connection breaks , comes again thinking of adding images yet uploaded request queue. this can result in more 1 copy of same image saved on server request same image might have gone through before getting rseponse. how can address scenario? i'm not quite sure why you're using service schedule requests volley automatically runs it's request in seperate thread. nevertheless can listen both request results, successful , unsuccessful adding listeners. you can remove image list schedule request using volley. if succeeds can carry on desired, if fails can add again list. public static request getimageuploadrequest(final string image) { response.listener<t> responselistener = new response.listener<t>() { @override public void onresponse(t response...
Read more

Combining PHP Registration and Login into one class with multiple functions in one PHP file -

-
i'm trying combine registration, activation , login scripts php website backend script front end developer can pass variables different forms to. my question whether appropriate approach this. don't want have lot of php files different pieces of application developing. far have written following 2 functions login, register , activate user front end developer can call: <?php /** * created phpstorm. * user: karl * date: 26/07/2016 * time: 02:25 */ class users { function register_user($email, $password, $user_name) { $server_name = "localhost"; $u_name = "root"; $db_password = "root"; $db_name = "betamath_graspe"; //email notification variable $from_address="info@slack.com"; //registration form $msg_reg_user='username taken. please choose different username'; $msg_reg_email='email registered'; $msg_reg_active=...
Read more