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    A New Chapter for MagicMirror: The Community Takes the Lead
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    child_process won't execute

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    • T Offline
      Temisola1 @sdetweil
      last edited by

      @sdetweil thanks for the response. that doesn’t seem to be working either.
      Is there something I need to install to be able to use stdout?

      S 1 Reply Last reply Reply Quote 0
      • 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.

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              • 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

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                • 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
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