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    A New Chapter for MagicMirror: The Community Takes the Lead
    Read the statement by Michael Teeuw here.

    child_process won't execute

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    • S Offline
      sdetweil @Temisola1
      last edited by

      @Temisola1 i will look at it in the morning…

      you are seeing the “I’m trying to retrieve data”

      in the terminal window where you did npm start, right?

      Sam

      How to add modules

      learning how to use browser developers window for css changes

      T 1 Reply Last reply Reply Quote 0
      • T Offline
        Temisola1 @sdetweil
        last edited by

        @sdetweil That is correct. It works up till that point.

        S 1 Reply Last reply Reply Quote 0
        • S Offline
          sdetweil @Temisola1
          last edited by

          @Temisola1 if you run this does it work from the terminal window?

          testit.py

          import sys 
          # Takes first name and last name via command  
          # line arguments and then display them 
          print("Output from Python") 
          print("First name: " ) 
          print("Last name: " ) 
          

          testit.js

            var spawn = require("child_process").spawn; 
          
              // Parameters passed in spawn - 
              // 1. type_of_script 
              // 2. list containing Path of the script 
              //    and arguments for the script  
          
              // E.g : http://localhost:3000/name?firstname=Mike&lastname=Will 
              // so, first name = Mike and last name = Will 
              var process = spawn('python3',["./testit.py"]); 
             //                         req.query.firstname, 
               //                       req.query.lastname] ); 
            
              // Takes stdout data from script which executed 
              // with arguments and send this data to res object 
              process.stdout.on('data', (data)=> { 
                  console.log("received " +data); 
              } ) 
          

          works for me… (note python script path is ./, make sure u have right path to py file)

          then do
          node testit.js

          Sam

          How to add modules

          learning how to use browser developers window for css changes

          T 2 Replies Last reply Reply Quote 0
          • T Offline
            Temisola1
            last edited by

            @sdetweil said in child_process won't execute:

            node testit.js

            Yes, that works in the console.

            1 Reply Last reply Reply Quote 0
            • T Offline
              Temisola1 @sdetweil
              last edited by

              @sdetweil So I tried putting in the full path in my node_helper as opposed to relative path and that seemed to work. is there a way I can log the current directory in nodejs. It seems that’s the issue

              S 1 Reply Last reply Reply Quote 0
              • T Offline
                Temisola1 @sdetweil
                last edited by Temisola1

                @sdetweil after running successfully a few times it now returns Buffer 48 45 5c… or something that looks like hexadecimal code

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                • S Offline
                  sdetweil @Temisola1
                  last edited by

                  @Temisola1 the node_helper doesn’t know where it is… but the Modulename does…

                  this.path

                  so, you can add that to the config info you send down in the typical

                  sendSocketNotification(“somevalue”, this.config)

                  to pass parameters to the node_helper

                  Sam

                  How to add modules

                  learning how to use browser developers window for css changes

                  1 Reply Last reply Reply Quote 0
                  • S Offline
                    sdetweil @Temisola1
                    last edited by

                    @Temisola1 said in child_process won't execute:

                    after running successfully a few times it now returns

                    u need to cleanup when the invoked process ends

                    process.on('exit', function() {
                      if (x) {
                        x.kill();
                      }
                    });
                    

                    Sam

                    How to add modules

                    learning how to use browser developers window for css changes

                    J 1 Reply Last reply Reply Quote 0
                    • J Offline
                      joshwilsonvu @sdetweil
                      last edited by

                      @sdetweil I just want to recommend the execa package as it solves some issues with “child_process,” like cleaning up when the process exits.

                      1 Reply Last reply Reply Quote 1
                      • T Offline
                        Temisola1
                        last edited by

                        Thank you all for all your wonderful suggestions. I’m able to run my python script successfully now. Thanks!

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