Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. Help with timer and JavaScript slot.
Forum Updated to NodeBB v4.3 + New Features

Help with timer and JavaScript slot.

Scheduled Pinned Locked Moved Solved General and Desktop
43 Posts 4 Posters 5.4k Views 2 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • SPlattenS SPlatten

    @kshegunov , realised that after posting, modified output to:

    qdbg() << "Script Eng Thread: " << pobjScriptEng->thread();
    qdbg() << "Before Timer creation: " << pobjCurrThread;
    

    Result is:

    S000000000028E000000000784T09:03:45.243DL00000642F../clsScriptHelper.cpp[void clsScriptHelper::createTimer]
    Script Eng Thread: QThread(0x60000000c0d0)
    S000000000029E000000000784T09:03:45.243DL00000643F../clsScriptHelper.cpp[void clsScriptHelper::createTimer]
    Before Timer creation: QThread(0x60000026f260)
    S000000000030E000000000784T09:03:45.243W:QObject: Cannot create children for a parent that is in a different thread.
    (Parent is clsScriptHelper(0x600000208d80), parent's thread is QThread(0x60000000c0d0), current thread is QThread(0x60000026f260)
    S000000000031E000000000784T09:03:45.244DL00000664F../clsScriptHelper.cpp[void clsScriptHelper::createTimer]
    Before QObject::connect: QThread(0x60000026f260)
    
    kshegunovK Offline
    kshegunovK Offline
    kshegunov
    Moderators
    wrote on last edited by kshegunov
    #30

    Right, so now comes the million bucks question(s):

    Why is clsScriptHelper::createTimer called from thread different from the one pobjScriptEng has affinity for?
    Why do you need to use threads to begin with?

    As for the "solution":

    QMetaObject::Connection cn = QObject::connect(ptmrScript
                                                             ,&QTimer::timeout
    

    Shall provide a context object for the execution. Looking at the body, I'd say it should be something like:

    QMetaObject::Connection cn = QObject::connect(ptmrScript , &QTimer::timeout, pobjScriptEng
                                                             ,[pobjScriptEng
                                                              ,ptmrScript
                                                              ,strFile
                                                              ,strFunc
                                                              ,strScriptWithCall]() {
    

    Also the timer should be created with the correct affinity, I assume:

    ptmrScript = new QTimer(pobjScriptEng);
    

    The original questions stand notwithstanding

    PS: You have race conditions all over the place ...

    Read and abide by the Qt Code of Conduct

    SPlattenS 2 Replies Last reply
    0
    • kshegunovK kshegunov

      Right, so now comes the million bucks question(s):

      Why is clsScriptHelper::createTimer called from thread different from the one pobjScriptEng has affinity for?
      Why do you need to use threads to begin with?

      As for the "solution":

      QMetaObject::Connection cn = QObject::connect(ptmrScript
                                                               ,&QTimer::timeout
      

      Shall provide a context object for the execution. Looking at the body, I'd say it should be something like:

      QMetaObject::Connection cn = QObject::connect(ptmrScript , &QTimer::timeout, pobjScriptEng
                                                               ,[pobjScriptEng
                                                                ,ptmrScript
                                                                ,strFile
                                                                ,strFunc
                                                                ,strScriptWithCall]() {
      

      Also the timer should be created with the correct affinity, I assume:

      ptmrScript = new QTimer(pobjScriptEng);
      

      The original questions stand notwithstanding

      PS: You have race conditions all over the place ...

      SPlattenS Offline
      SPlattenS Offline
      SPlatten
      wrote on last edited by
      #31

      @kshegunov , createTimer is called by JavaScript:

      function setupForm() {
      	//Query all people	  
      	xmleng.log(0, "setupForm() !!!!", cstrThis, 202);
      	//Create request counter property
      	xmleng.setProperty(cstrFormTest, cstrStageCtr, "0");
      	//Create timer to issue SQL requests
      	xmleng.createTimer("t1", 50, "simon2.js@testTimer");
      	xmleng.log(0, "setupForm() !!!!", cstrThis, 207);
      	xmleng.startTimer("t1");
      };
      
      

      Kind Regards,
      Sy

      1 Reply Last reply
      0
      • kshegunovK kshegunov

        Right, so now comes the million bucks question(s):

        Why is clsScriptHelper::createTimer called from thread different from the one pobjScriptEng has affinity for?
        Why do you need to use threads to begin with?

        As for the "solution":

        QMetaObject::Connection cn = QObject::connect(ptmrScript
                                                                 ,&QTimer::timeout
        

        Shall provide a context object for the execution. Looking at the body, I'd say it should be something like:

        QMetaObject::Connection cn = QObject::connect(ptmrScript , &QTimer::timeout, pobjScriptEng
                                                                 ,[pobjScriptEng
                                                                  ,ptmrScript
                                                                  ,strFile
                                                                  ,strFunc
                                                                  ,strScriptWithCall]() {
        

        Also the timer should be created with the correct affinity, I assume:

        ptmrScript = new QTimer(pobjScriptEng);
        

        The original questions stand notwithstanding

        PS: You have race conditions all over the place ...

        SPlattenS Offline
        SPlattenS Offline
        SPlatten
        wrote on last edited by
        #32

        @kshegunov , I've modified my source to:

         QMetaObject::Connection cn = QObject::connect(ptmrScript
                                                      ,&QTimer::timeout
                                                      ,pobjScriptEng
                                                      ,[pobjScriptEng
                                                       ,ptmrScript
                                                       ,strFile
                                                       ,strFunc
                                                       ,strScriptWithCall]() {
        

        still getting:

        S000000000027E000000000747T09:17:30.915DL00000202Fsimon2.js[void clsScriptHelper::log]
        setupForm() !!!!
        S000000000028E000000000747T09:17:30.915DL00000207Fsimon2.js[void clsScriptHelper::log]
        setupForm() !!!!
        S000000000029E000000000747T09:17:30.915W:QObject::startTimer: Timers cannot be started from another thread
        

        Kind Regards,
        Sy

        kshegunovK 1 Reply Last reply
        0
        • SPlattenS SPlatten

          @kshegunov , I've modified my source to:

           QMetaObject::Connection cn = QObject::connect(ptmrScript
                                                        ,&QTimer::timeout
                                                        ,pobjScriptEng
                                                        ,[pobjScriptEng
                                                         ,ptmrScript
                                                         ,strFile
                                                         ,strFunc
                                                         ,strScriptWithCall]() {
          

          still getting:

          S000000000027E000000000747T09:17:30.915DL00000202Fsimon2.js[void clsScriptHelper::log]
          setupForm() !!!!
          S000000000028E000000000747T09:17:30.915DL00000207Fsimon2.js[void clsScriptHelper::log]
          setupForm() !!!!
          S000000000029E000000000747T09:17:30.915W:QObject::startTimer: Timers cannot be started from another thread
          
          kshegunovK Offline
          kshegunovK Offline
          kshegunov
          Moderators
          wrote on last edited by
          #33

          @SPlatten said in Help with timer and JavaScript slot.:

          still getting

          Did you also parent the timer to the QJSEngine?

          Read and abide by the Qt Code of Conduct

          SPlattenS 1 Reply Last reply
          0
          • kshegunovK kshegunov

            @SPlatten said in Help with timer and JavaScript slot.:

            still getting

            Did you also parent the timer to the QJSEngine?

            SPlattenS Offline
            SPlattenS Offline
            SPlatten
            wrote on last edited by SPlatten
            #34

            @kshegunov, this is how it is now:

            QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
            QThread* pobjScriptEngThread(pobjScriptEng->thread());
            //Create new timer
            ptmrScript = new QTimer();
            ptmrScript->moveToThread(pobjScriptEngThread);
            ptmrScript->setInterval(cuintInterval);
            

            Have just modified to:

            QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
            QThread* pobjScriptEngThread(pobjScriptEng->thread());
            //Create new timer
            ptmrScript = new QTimer();
            ptmrScript->setParent(pobjScriptEng);
            ptmrScript->moveToThread(pobjScriptEngThread);
            ptmrScript->setInterval(cuintInterval);
            

            Output is still:

            S000000000027E000000000743T09:24:17.520DL00000202Fsimon2.js[void clsScriptHelper::log]
            setupForm() !!!!
            S000000000028E000000000743T09:24:17.520W:QObject::setParent: Cannot set parent, new parent is in a different thread
            S000000000029E000000000743T09:24:17.520DL00000207Fsimon2.js[void clsScriptHelper::log]
            setupForm() !!!!
            

            Kind Regards,
            Sy

            JonBJ kshegunovK KroMignonK 3 Replies Last reply
            0
            • SPlattenS SPlatten

              @kshegunov, this is how it is now:

              QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
              QThread* pobjScriptEngThread(pobjScriptEng->thread());
              //Create new timer
              ptmrScript = new QTimer();
              ptmrScript->moveToThread(pobjScriptEngThread);
              ptmrScript->setInterval(cuintInterval);
              

              Have just modified to:

              QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
              QThread* pobjScriptEngThread(pobjScriptEng->thread());
              //Create new timer
              ptmrScript = new QTimer();
              ptmrScript->setParent(pobjScriptEng);
              ptmrScript->moveToThread(pobjScriptEngThread);
              ptmrScript->setInterval(cuintInterval);
              

              Output is still:

              S000000000027E000000000743T09:24:17.520DL00000202Fsimon2.js[void clsScriptHelper::log]
              setupForm() !!!!
              S000000000028E000000000743T09:24:17.520W:QObject::setParent: Cannot set parent, new parent is in a different thread
              S000000000029E000000000743T09:24:17.520DL00000207Fsimon2.js[void clsScriptHelper::log]
              setupForm() !!!!
              
              JonBJ Offline
              JonBJ Offline
              JonB
              wrote on last edited by
              #35

              @SPlatten
              Perhaps not relevant, but how can you go

                          ptmrScript->moveToThread(pobjScriptEngThread);
                          ptmrScript->setInterval(cuintInterval);
              

              Once moved to other thread, are you still allowed to set its interval from this (different) thread?

              1 Reply Last reply
              0
              • SPlattenS SPlatten

                @kshegunov, this is how it is now:

                QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
                QThread* pobjScriptEngThread(pobjScriptEng->thread());
                //Create new timer
                ptmrScript = new QTimer();
                ptmrScript->moveToThread(pobjScriptEngThread);
                ptmrScript->setInterval(cuintInterval);
                

                Have just modified to:

                QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
                QThread* pobjScriptEngThread(pobjScriptEng->thread());
                //Create new timer
                ptmrScript = new QTimer();
                ptmrScript->setParent(pobjScriptEng);
                ptmrScript->moveToThread(pobjScriptEngThread);
                ptmrScript->setInterval(cuintInterval);
                

                Output is still:

                S000000000027E000000000743T09:24:17.520DL00000202Fsimon2.js[void clsScriptHelper::log]
                setupForm() !!!!
                S000000000028E000000000743T09:24:17.520W:QObject::setParent: Cannot set parent, new parent is in a different thread
                S000000000029E000000000743T09:24:17.520DL00000207Fsimon2.js[void clsScriptHelper::log]
                setupForm() !!!!
                
                kshegunovK Offline
                kshegunovK Offline
                kshegunov
                Moderators
                wrote on last edited by
                #36

                Okay, I'm getting really tangled. Where is QTimer::start called? In createTimer? If so, then:

                QTimer timer = new QTimer();
                ...
                // Connect the lambda with a context object, as mentioned!
                ...
                timer->start();
                

                Read and abide by the Qt Code of Conduct

                SPlattenS 1 Reply Last reply
                0
                • kshegunovK kshegunov

                  Okay, I'm getting really tangled. Where is QTimer::start called? In createTimer? If so, then:

                  QTimer timer = new QTimer();
                  ...
                  // Connect the lambda with a context object, as mentioned!
                  ...
                  timer->start();
                  
                  SPlattenS Offline
                  SPlattenS Offline
                  SPlatten
                  wrote on last edited by
                  #37

                  @kshegunov , I'm trying lots of things without taking the time to think about it.

                  Kind Regards,
                  Sy

                  kshegunovK 1 Reply Last reply
                  0
                  • SPlattenS SPlatten

                    @kshegunov , I'm trying lots of things without taking the time to think about it.

                    kshegunovK Offline
                    kshegunovK Offline
                    kshegunov
                    Moderators
                    wrote on last edited by
                    #38

                    @SPlatten said in Help with timer and JavaScript slot.:

                    I'm trying lots of things without taking the time to think about it.

                    Yes, do so. Which is the whole reason I requested the call stack. How am I supposed to guess what calls what ...

                    Read and abide by the Qt Code of Conduct

                    SPlattenS 1 Reply Last reply
                    0
                    • kshegunovK kshegunov

                      @SPlatten said in Help with timer and JavaScript slot.:

                      I'm trying lots of things without taking the time to think about it.

                      Yes, do so. Which is the whole reason I requested the call stack. How am I supposed to guess what calls what ...

                      SPlattenS Offline
                      SPlattenS Offline
                      SPlatten
                      wrote on last edited by
                      #39

                      @kshegunov I would provide the call stack, but execution doesn't halt, so where would you like me to break to then get the stack?

                      Kind Regards,
                      Sy

                      kshegunovK 1 Reply Last reply
                      0
                      • SPlattenS SPlatten

                        @kshegunov, this is how it is now:

                        QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
                        QThread* pobjScriptEngThread(pobjScriptEng->thread());
                        //Create new timer
                        ptmrScript = new QTimer();
                        ptmrScript->moveToThread(pobjScriptEngThread);
                        ptmrScript->setInterval(cuintInterval);
                        

                        Have just modified to:

                        QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
                        QThread* pobjScriptEngThread(pobjScriptEng->thread());
                        //Create new timer
                        ptmrScript = new QTimer();
                        ptmrScript->setParent(pobjScriptEng);
                        ptmrScript->moveToThread(pobjScriptEngThread);
                        ptmrScript->setInterval(cuintInterval);
                        

                        Output is still:

                        S000000000027E000000000743T09:24:17.520DL00000202Fsimon2.js[void clsScriptHelper::log]
                        setupForm() !!!!
                        S000000000028E000000000743T09:24:17.520W:QObject::setParent: Cannot set parent, new parent is in a different thread
                        S000000000029E000000000743T09:24:17.520DL00000207Fsimon2.js[void clsScriptHelper::log]
                        setupForm() !!!!
                        
                        KroMignonK Offline
                        KroMignonK Offline
                        KroMignon
                        wrote on last edited by KroMignon
                        #40

                        @SPlatten I am always surprised how complicated you are trying to solve common issues.

                        What is the real issue here?
                        You want to create a timer in a specific thread and start it. I am right?
                        QTimer muss be started, and stopped from the owned thread.
                        That's not so complicated to solve:

                        auto myTimer = new  QTimer();
                        connect(myTimer; &QTimer::timeout, ...);
                        // move to thread
                        myTimer->moveToThread(theWorkingThread);
                        
                        // start the timer
                        QTimer::singleShot(0, myTimer, [myTimer]() { myTimer->start(); } );
                        

                        It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                        SPlattenS 1 Reply Last reply
                        1
                        • KroMignonK KroMignon

                          @SPlatten I am always surprised how complicated you are trying to solve common issues.

                          What is the real issue here?
                          You want to create a timer in a specific thread and start it. I am right?
                          QTimer muss be started, and stopped from the owned thread.
                          That's not so complicated to solve:

                          auto myTimer = new  QTimer();
                          connect(myTimer; &QTimer::timeout, ...);
                          // move to thread
                          myTimer->moveToThread(theWorkingThread);
                          
                          // start the timer
                          QTimer::singleShot(0, myTimer, [myTimer]() { myTimer->start(); } );
                          
                          SPlattenS Offline
                          SPlattenS Offline
                          SPlatten
                          wrote on last edited by SPlatten
                          #41

                          @KroMignon , thank you, will try this now, right now before trying your suggestion the output is:

                          S000000000027E000000000715T09:32:03.904DL00000202Fsimon2.js[void clsScriptHelper::log]
                          setupForm() !!!!
                          S000000000028E000000000715T09:32:03.904DL00000207Fsimon2.js[void clsScriptHelper::log]
                          setupForm() !!!!
                          S000000000029E000000003405T09:32:06.594W:QObject::startTimer: Timers cannot be started from another thread
                          

                          @KroMignon, thank you so much, this now works, here are the prototypes:

                          Q_INVOKABLE void createTimer(const QString& crstrID, const uint cuintInterval
                                                      ,const QString& crstrFunction);
                          Q_INVOKABLE void startTimer(const QString& crstrID);
                          

                          And the final implementations:

                          /**
                           * @brief clsScriptHelper::createTimer
                           * @param crstrID : Constant reference to Timer ID
                           * @param cuintInterval : Constant millisecond interval
                           * @param crstrFunction : Constant reference to JSfile@Function
                           */
                          void clsScriptHelper::createTimer(const QString& crstrID, const uint cuintInterval
                                                           ,const QString& crstrFunction) {
                              if ( crstrID.trimmed().isEmpty() == true || cuintInterval == 0
                                || crstrFunction.trimmed().isEmpty() == true
                                || crstrFunction.indexOf(clsXMLnode::msccScriptDelimiter) == -1 ) {
                              //One or more of the parameters are invalid, do nothing
                                  return;
                              }
                              //Get Application instance
                              clsMainWnd* pAppInstance(clsMainWnd::pobjGetAppWnd());
                              if ( pAppInstance == nullptr ) {
                              //Cannot get application instance!
                                  return;
                              }
                              //Look for registered timer
                              QTimer* ptmrScript(pAppInstance->ptmrGetTimer(crstrID));
                              if ( ptmrScript != nullptr ) {
                              //Already registered, do nothing
                                  return;
                              }
                              //No timer locatd with that ID, its safe to proceed
                              QStringList slstScript = crstrFunction.split(clsXMLnode::msccScriptDelimiter);
                              mpScripts* pmpScriptsMap;
                              if ( slstScript.length() == SSF_PARAM_COUNT
                              && (pmpScriptsMap = clsMainWnd::pmpGetScriptsMap()) != nullptr ) {
                              //Look for the script in the scripts map
                                  mpScripts::iterator itrScript(pmpScriptsMap->find(slstScript[SFF_FILE_IDX]));
                                  if ( itrScript != pmpScriptsMap->end() ) {
                              //Found it, build the script up ready for the signal connection
                                      QString strScript(itrScript->second);
                              //Get pointer to script engine
                                      QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
                              //Create new timer
                                      ptmrScript = new QTimer();
                                      ptmrScript->setInterval(cuintInterval);
                              //Register the new timer using the supplied ID
                                      pAppInstance->registerTimer(ptmrScript, crstrID);
                              //Add any globals to the script
                                      clsScriptHelper::pobjGetInstance()->addGlobals(pobjScriptEng);
                              //Build up script function call
                                      QString strFile(slstScript[SFF_FILE_IDX])
                                             ,strCall(slstScript[SSF_FUNCTION_IDX])
                                             ,strScriptWithCall(strScript)
                                             ,strFunc(strCall
                                                    + QString(clsDebugService::msccBrktOpen)
                                                    + QString(clsDebugService::msccBrktClose)
                                                    + QString(clsXMLnode::msccScriptFunctionTerminator));
                                       if ( strScriptWithCall.endsWith(clsXMLnode::msccScriptFunctionTerminator) != true ) {
                                           strScriptWithCall += clsXMLnode::msccScriptFunctionTerminator;
                                       }
                                       strScriptWithCall += strFunc;
                              //Create connection to timer and script
                                       QMetaObject::Connection cn = QObject::connect(ptmrScript
                                                                                   ,&QTimer::timeout
                                                                                   ,pobjScriptEng
                                                                                   ,[pobjScriptEng
                                                                                    ,ptmrScript
                                                                                    ,strFile
                                                                                    ,strFunc
                                                                                    ,strScriptWithCall]() {
                                           QJSValue objResult(pobjScriptEng->evaluate(strScriptWithCall));
                                           QString strError;
                                           if ( objResult.isError() == true ) {
                                               strError = QString("%1\n%2\n%3").arg(strFile).arg(strFunc)
                                                                               .arg(objResult.toString());
                                           } else {
                                               QString strResult(objResult.toString());
                                               if ( strResult.compare("undefined") != 0 ) {
                                                   strError = strResult;
                                               }
                                           }
                                           if ( strError.isEmpty() != true ) {
                                               clsXMLnode* pobjRoot(clsXMLnode::spobjGetRoot());
                                               emit pobjRoot->error(strError);
                                               ptmrScript->deleteLater();
                                           }
                                      });
                                      QThread* pobjScriptEngThread(pobjScriptEng->thread());
                                      ptmrScript->moveToThread(pobjScriptEngThread);
                                  }
                              }
                          }
                          /**
                           * @brief clsScriptHelper::startTimer
                           * @param crstrID : Constant reference to timer ID
                           */
                          void clsScriptHelper::startTimer(const QString& crstrID) {
                              //Get Application instance
                              clsMainWnd* pAppInstance(clsMainWnd::pobjGetAppWnd());
                              if ( pAppInstance == nullptr ) {
                              //Cannot get application instance!
                                  return;
                              }
                              QTimer* ptmrScript(pAppInstance->ptmrGetTimer(crstrID));
                              if ( ptmrScript != nullptr ) {
                                  QTimer::singleShot(0, ptmrScript, [ptmrScript]() { ptmrScript->start(); } );
                              }
                          }
                          

                          Kind Regards,
                          Sy

                          KroMignonK 1 Reply Last reply
                          0
                          • SPlattenS SPlatten

                            @kshegunov I would provide the call stack, but execution doesn't halt, so where would you like me to break to then get the stack?

                            kshegunovK Offline
                            kshegunovK Offline
                            kshegunov
                            Moderators
                            wrote on last edited by
                            #42

                            @SPlatten said in Help with timer and JavaScript slot.:

                            I would provide the call stack, but execution doesn't halt, so where would you like me to break to then get the stack?

                            Before doing the connect for the timer timeout. Provide the following things (in one post please):

                            1. The whole source of the enclosing function.
                            2. The call stack.
                            3. The output of this added just before doing the connect:
                            qDebug() << ptmrScript->thread() << QThread::currentThread() << ptmrScript->parent();
                            

                            Read and abide by the Qt Code of Conduct

                            1 Reply Last reply
                            0
                            • SPlattenS SPlatten

                              @KroMignon , thank you, will try this now, right now before trying your suggestion the output is:

                              S000000000027E000000000715T09:32:03.904DL00000202Fsimon2.js[void clsScriptHelper::log]
                              setupForm() !!!!
                              S000000000028E000000000715T09:32:03.904DL00000207Fsimon2.js[void clsScriptHelper::log]
                              setupForm() !!!!
                              S000000000029E000000003405T09:32:06.594W:QObject::startTimer: Timers cannot be started from another thread
                              

                              @KroMignon, thank you so much, this now works, here are the prototypes:

                              Q_INVOKABLE void createTimer(const QString& crstrID, const uint cuintInterval
                                                          ,const QString& crstrFunction);
                              Q_INVOKABLE void startTimer(const QString& crstrID);
                              

                              And the final implementations:

                              /**
                               * @brief clsScriptHelper::createTimer
                               * @param crstrID : Constant reference to Timer ID
                               * @param cuintInterval : Constant millisecond interval
                               * @param crstrFunction : Constant reference to JSfile@Function
                               */
                              void clsScriptHelper::createTimer(const QString& crstrID, const uint cuintInterval
                                                               ,const QString& crstrFunction) {
                                  if ( crstrID.trimmed().isEmpty() == true || cuintInterval == 0
                                    || crstrFunction.trimmed().isEmpty() == true
                                    || crstrFunction.indexOf(clsXMLnode::msccScriptDelimiter) == -1 ) {
                                  //One or more of the parameters are invalid, do nothing
                                      return;
                                  }
                                  //Get Application instance
                                  clsMainWnd* pAppInstance(clsMainWnd::pobjGetAppWnd());
                                  if ( pAppInstance == nullptr ) {
                                  //Cannot get application instance!
                                      return;
                                  }
                                  //Look for registered timer
                                  QTimer* ptmrScript(pAppInstance->ptmrGetTimer(crstrID));
                                  if ( ptmrScript != nullptr ) {
                                  //Already registered, do nothing
                                      return;
                                  }
                                  //No timer locatd with that ID, its safe to proceed
                                  QStringList slstScript = crstrFunction.split(clsXMLnode::msccScriptDelimiter);
                                  mpScripts* pmpScriptsMap;
                                  if ( slstScript.length() == SSF_PARAM_COUNT
                                  && (pmpScriptsMap = clsMainWnd::pmpGetScriptsMap()) != nullptr ) {
                                  //Look for the script in the scripts map
                                      mpScripts::iterator itrScript(pmpScriptsMap->find(slstScript[SFF_FILE_IDX]));
                                      if ( itrScript != pmpScriptsMap->end() ) {
                                  //Found it, build the script up ready for the signal connection
                                          QString strScript(itrScript->second);
                                  //Get pointer to script engine
                                          QJSEngine* pobjScriptEng(clsJSON::pobjGetScriptEng());
                                  //Create new timer
                                          ptmrScript = new QTimer();
                                          ptmrScript->setInterval(cuintInterval);
                                  //Register the new timer using the supplied ID
                                          pAppInstance->registerTimer(ptmrScript, crstrID);
                                  //Add any globals to the script
                                          clsScriptHelper::pobjGetInstance()->addGlobals(pobjScriptEng);
                                  //Build up script function call
                                          QString strFile(slstScript[SFF_FILE_IDX])
                                                 ,strCall(slstScript[SSF_FUNCTION_IDX])
                                                 ,strScriptWithCall(strScript)
                                                 ,strFunc(strCall
                                                        + QString(clsDebugService::msccBrktOpen)
                                                        + QString(clsDebugService::msccBrktClose)
                                                        + QString(clsXMLnode::msccScriptFunctionTerminator));
                                           if ( strScriptWithCall.endsWith(clsXMLnode::msccScriptFunctionTerminator) != true ) {
                                               strScriptWithCall += clsXMLnode::msccScriptFunctionTerminator;
                                           }
                                           strScriptWithCall += strFunc;
                                  //Create connection to timer and script
                                           QMetaObject::Connection cn = QObject::connect(ptmrScript
                                                                                       ,&QTimer::timeout
                                                                                       ,pobjScriptEng
                                                                                       ,[pobjScriptEng
                                                                                        ,ptmrScript
                                                                                        ,strFile
                                                                                        ,strFunc
                                                                                        ,strScriptWithCall]() {
                                               QJSValue objResult(pobjScriptEng->evaluate(strScriptWithCall));
                                               QString strError;
                                               if ( objResult.isError() == true ) {
                                                   strError = QString("%1\n%2\n%3").arg(strFile).arg(strFunc)
                                                                                   .arg(objResult.toString());
                                               } else {
                                                   QString strResult(objResult.toString());
                                                   if ( strResult.compare("undefined") != 0 ) {
                                                       strError = strResult;
                                                   }
                                               }
                                               if ( strError.isEmpty() != true ) {
                                                   clsXMLnode* pobjRoot(clsXMLnode::spobjGetRoot());
                                                   emit pobjRoot->error(strError);
                                                   ptmrScript->deleteLater();
                                               }
                                          });
                                          QThread* pobjScriptEngThread(pobjScriptEng->thread());
                                          ptmrScript->moveToThread(pobjScriptEngThread);
                                      }
                                  }
                              }
                              /**
                               * @brief clsScriptHelper::startTimer
                               * @param crstrID : Constant reference to timer ID
                               */
                              void clsScriptHelper::startTimer(const QString& crstrID) {
                                  //Get Application instance
                                  clsMainWnd* pAppInstance(clsMainWnd::pobjGetAppWnd());
                                  if ( pAppInstance == nullptr ) {
                                  //Cannot get application instance!
                                      return;
                                  }
                                  QTimer* ptmrScript(pAppInstance->ptmrGetTimer(crstrID));
                                  if ( ptmrScript != nullptr ) {
                                      QTimer::singleShot(0, ptmrScript, [ptmrScript]() { ptmrScript->start(); } );
                                  }
                              }
                              
                              KroMignonK Offline
                              KroMignonK Offline
                              KroMignon
                              wrote on last edited by
                              #43

                              @SPlatten said in Help with timer and JavaScript slot.:

                              right now before trying your suggestion the output is:

                                 setupForm() !!!!
                                 S000000000029E000000003405T09:32:06.594W:QObject::startTimer: Timers cannot be started from another thread
                              

                              Same issue, you are trying to start a QTimer from the wrong thread.
                              QTimer::singleShot(0, myTimer, [myTimer]() { myTimer->start(); } ); will solve this.

                              It is an old maxim of mine that when you have excluded the impossible, whatever remains, however improbable, must be the truth. (Sherlock Holmes)

                              1 Reply Last reply
                              0

                              • Login

                              • Login or register to search.
                              • First post
                                Last post
                              0
                              • Categories
                              • Recent
                              • Tags
                              • Popular
                              • Users
                              • Groups
                              • Search
                              • Get Qt Extensions
                              • Unsolved