Why connecttng signals and slots of an element of action gets segfault

Similar Questions

• Signals and Slots

  Try to test something after that someone wanted to help with the signals and Slots sorta. I know there is an alternative to this, but I'm trying to understand why this does not work when doing it this way.  It relies, it works but it does not fly... I mean this isn't the trigger of the SLOT feature... Not even sure if she sends a SIGNAL...

  Thanks in advance.

  file:

  // Default empty project template
  #ifndef Testme_HPP_
  #define Testme_HPP_
  
  #include 
  
  namespace bb { namespace cascades { class Application; }}
  namespace bb { namespace cascades { class TouchEvent; }}
  namespace bb { namespace cascades { class Container; }}
  namespace bb { namespace cascades { class ImageView; }}
  
  /*!
   * @brief Application pane object
   *
   *Use this object to create and init app UI, to create context objects, to register the new meta types etc.
   */
  class Testme : public QObject
  {
      Q_OBJECT
  public:
      Testme(bb::cascades::Application *app);
      virtual ~Testme() {}
  public slots:
      void handleTouch(bb::cascades::TouchEvent* tEvent);
  private:
      bb::cascades::Container* rootContainer;
      bb::cascades::ImageView* imgView;
  };
  
  #endif /* Testme_HPP_ */
  

  .cpp file:

  // Default empty project template
  #include "Testme.hpp"
  
  #include 
  #include 
  #include 
  #include 
  #include 
  #include 
  
  using namespace bb::cascades;
  
  Testme::Testme(bb::cascades::Application *app)
  : QObject(app)
  {
      // create scene document from main.qml asset
      // set parent to created document to ensure it exists for the whole application lifetime
      QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
      QmlDocument *qml2 = QmlDocument::create("asset:///Testingme.qml").parent(this);
  
      // create root object for the UI
      AbstractPane *root = qml->createRootObject();
      // set created root object as a scene
      app->setScene(root);
  
      if (!qml2->hasErrors()) {
          rootContainer = qml2->createRootObject();
  
          if (rootContainer) {
              imgView = rootContainer->findChild("imgView");
  
              if (imgView) {
                  bool res = QObject::connect(imgView,                                        SIGNAL(touch(bb::cascades::TouchEvent*)),
                          this, SLOT(handleTouch(bb::cascades::TouchEvent*)));
                  Q_ASSERT(res);
                  Q_UNUSED(res);
                  fprintf(stderr, "Height: %f and width: %f\n",
                          imgView->preferredHeight(),                                        imgView->preferredWidth());
              } else {
                  fprintf(stderr, "No ImageView\n");
              }
          } else {
              fprintf(stderr, "No root container\n");
          }
      } else {
          fprintf(stderr, "QML2 has errors\n");
      }
  }
  
  void Testme::handleTouch(TouchEvent *tEvent)
  {
      fprintf(stderr, "Touch Touch Touch\n");
  }
  

  hand file. QML:

  // Default empty project template
  import bb.cascades 1.0
  
  // creates one page with a label
  Page {
      Container {
          layout: StackLayout {}
          Label {
              text: qsTr("Hello World")
          }
  
          Testingme {
              id: testingMe
          }
      }
  }
  

  File Testingme.QML:

  import bb.cascades 1.0
  
  Container {
      objectName: "rootContainer"
      horizontalAlignment: HorizontalAlignment.Center
      verticalAlignment: VerticalAlignment.Center
      background: Color.create ("#262626")
  
      ImageView {
          objectName: "imgView"
          imageSource: "asset:///belligerent.png"
          preferredHeight: 200
          preferredWidth: 200
      }
  }
  

  The main file is the one you get when you create a new project of Cascades Standard default. So, what's wrong with this picture? Or of images, other than the fact that I use the png of bellicose blocks file...

  -Edit (this and some formatting).

  I'm using the Simulator, so don't know if it would make a difference. BTW, I even tried to use a checkbox, and which does not trigger anything.

  Well, it works eventually got. I'm still not sure where to check signals during debugging, however.

  Although there are two files QML, the first main QML object is one that should be used. I used the 2nd QML file object that was wrong, even if the image is in the 2nd...

• Problem, the signals and Slots

  Hi, as I posted in one of my other posts I have following problem with signals and messages and would be nice if someone could clarify anything that I don't seem to be able to find what the problem of the outputs.

  I have the code:

  void MYNetworkClass::requestFinished(QNetworkReply* reply)
  {
  
        // Check the network reply for errors
        if (reply->error() == QNetworkReply::NoError)
        {
           // read response
           const QByteArray response(reply->readAll());
           qDebug() <<"Response: "<< response;
  
           JsonDataAccess jda;
           QVariantMap results = jda.loadFromBuffer(response).toMap();
  
           QVariantMap data = results.value("SomeData").toMap();
  
           emit signalSuccess(data); // I reach here .... 
  
  // however actually when I click "Step Over" in debug mode, and try to exit the function// afterwards I get such "error" saying: No source available for "QMetaObject::activate() at  0xb9668da7" - highlighted in red.
  
       }
       else
       {
           qDebug() << "\n Problem with the network";
           qDebug() << "\n" << reply->errorString();
       }
  

  In MyNetwork class I also added the definition of signal in the header file:

  signals:
  
      void signalSuccess(QVariantMap result);
  

  Now also when someone calls an object MyNetworkClass method which calls requestFinished,.

  I want to catch the signal which is emitted by the requestFinished - as shown above.

       MyNetworkClass *network = new MyNetworkClass();
  
      QMap params;
      params.insert("username", userEmail);
  
      bool res = QObject::connect(network, SIGNAL(signalSuccess(QVariantMap)), this, SLOT(SomeSlotForSignal(QVariantMap)));
  
          Q_ASSERT(res);
      Q_UNUSED(res);
          network->makePostRequest("Login");
  

  My problem is that the SomeSlotForSignal slot never is called... (even if the signal is issued constitute requestFinished method and as I stated SomeSlotForSignal as a crack in the header file...) What can be problem? Any help? Thank you.

  I guess I solved the problem.

  The code I presented previously registered function

  F of a class B:

   void B::f()
  {
  MyNetworkClass *network = new MyNetworkClass();
  
      QMap params;
      params.insert("username", userEmail);
  
      bool res = QObject::connect(network, SIGNAL(signalSuccess(QVariantMap)), this, SLOT(SomeSlotForSignal(QVariantMap)));
  
          Q_ASSERT(res);
      Q_UNUSED(res);
  
  network->makePostRequest("Login");
  }
  

  Then the function f is called to:

      B object;
      object.f();
  
  The problem was I think that when the server responded "object" was destroyed from the stack. When I replaced the above code, with 
  
       B* object = new B();
      object->f();
  
  I think it works now......
  

• Unable connect 2 classes of signals and Slots

  I am transferring from one category to the other channels.

  Their memories are:

  .hpp files------------
  class A::public QObject{
  Q_OBJECT
  
  signals:
  void emitMsg(QString* msg);
  }
  
  class B::public QObject{
  signals:
  void emitA(QString* msgA);
  public slots:
  void logMsg(QString* msg);
  }
  
  ---------.cpp files
  
  classB::classB(){
  bool temp= connect(objB,SIGNAL(emitA(QString*)),this,SLOT(logMsg(QString*)));
  
  qDebug()<<"value="<
  But even running in the device debug mode Dev Alpha, the application displays a value in the log messages, or moves out of the screen dark splash.
  Please adivse, what is missing from the other code?
  Is there a way by which the slots and signals of different classes could be connected to data transfer?
  			 
  Create a Downloader object?
  (BTW, I always initialize pointers to 0 in the initializer list.)  Who does this kind of obvious thing, and it has the same thing for debug and release)
  Stuart
  		   

• How to get the callUpdated signal and respond to the function of oncallUpdated slot?

  Hello world:

  I want to get the 'phone. callUpdated (const bb::system:: call & appeal) "signal and do something in the slot to onCallUpdated function, but the problem is crack onCallUpdated() function does NOT respond!

  Here is my code:

  . CPP

  #include 
  

  MyApp (bb::cascades:Application * app) in myApp.cpp

      bb::system::phone::Phone phone;
  
      bool success = QObject::connect(&phone,SIGNAL(callUpdated(const bb::system::phone::Call&)),this,SLOT(onCallUpdated(const bb::system::phone::Call&)));
  
      qDebug()<<"bb::system::phone::Phone phone:  "<
  When the application runs, the success of back connect is true!
  void Quicker::onCallUpdated(const bb::system::phone::Call &call)
  {
  
      //CallState::Type state = call.callState();
  
      qDebug()<<"onCallUpdated is called";
  }
  
  In myApp.hpp
  #include 
  
       void onCallUpdated(const bb::system::phone::Call &call);
  
  In the bar - descriptor.xml
      run_when_backgrounded
      access_phone
  			 
  I found the problem:
  bb::system::phone::Phone phone;
  
  the code must be in the *.hpp.
  Thank you all.
  		   

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• Align the two signals and measure the Phase Shift

  Hello

  I do an experiment in which I use the NI USB-6221 DAQ card. The jury is able to make 250 k samples/second. I want to measure two voltages in a circuit and find the phase shift between them at frequencies between 1 and 10000. First I ouputted a wave sinusoidal frequency variable through the Commission and applied to a test circuit. Then I used the Board to measure the two tensions consecutively (thus reducing the maximum sampling frequency at 125 k). I used the signals align VI and measured the two phases and then calculates the phase shift (VI attached in Phase 1). It worked well for the test circuit I built in which the phase shift went way logarithmique.20 degrees ~84.5 degrees and then stabilized. At frequencies above 5 000 Hz phase shift must have remained constant, but it varies more or less 1 degree. When the phase shift is 84.5 degrees, present a degree of variability is not particularly explicit. When I asked my program on the circuit that I really wanted to measure, the phase shift went from-. 5 degrees up to about 1.2 degrees. The change in the values of phase shift at high frequencies (> 3000) was environ.2 degrees. Given the small phase shift, this variation is unacceptable. Now I tried to use a sequence to each blood individually (increase the maximum sampling frequency to 250 k) and then align the two signals and measure the phase of each shift. When I use align it and re - sample Express VI to realign the two signals, I get the message "error 20333 analysis: cannot align two waveforms with dt even if their samples are not clocked in phase." Is it possible to align two signals I describe here? I enclose the new VI as Phase 2

  Matthew,

  I think I have an idea for at least part of the problem.

  I took your program data and deleted stuff DAQ.  I have converted the Signal on the chart control and looked then what was going on with the signal analysis.

  The output of the Waveforms.vi line has two waveforms, like the entry.  However, arrays of Y in the two waveforms are empty!  It does not generate an error. After some head scratching, reading the help files and try things out, that's what I think is happening: the time t0 two input signals are 1,031 seconds apart. Since the wavefoms contains 1,000 seconds of data, there is no overlap and may not align them.

  I changed the t0 on two waveforms are the same, and it lines up.  The number of items in the tables is reduced by one. Then I increased the t0 of 0.1 seconds on the first element. The output had both greater than the entry by dt t0 t0 and the size of the arrays was 224998.  Reversing the t0 two elements shifts the phase in the opposite direction.

  What that tells me, is that you can not reliably align two waveforms which do not overlap.

  I suggest that you go to 2-channel data acquisition and that it accept the reduced sample rate.  You won't get the resolution you want, but you should be able to tell if something important happens.

  You may be able to improve the equivalent resolution by taking multiple steps with a slight phase shift. This is similar to the way that old oscilloscopes of sampling (analog) worked. Take a series of measures with the signal you are currently using.  The make enough average to minimize changes due to noise. Then pass the phase of the signal of excitement to an amount that is smaller than the resolution of phase of sampling rate and repeat the measurements.  Recall that I calculated that for a 5 kHz signal sampled at 125kHz, you get a sample every 14.4 degrees. If shift you the phase of 1 degree (to the point/mathematical simulation), you get a different set of samples for excitement.  They are always separated by 14.4 degrees.  Take another series of measures. Transfer phase another degree and repeat.  As long as your sampling clocks are stable enough so that frequency does not drift significantly (and it shouldn't with your equipment), you should be able to get near resolution of what you need.  The trade-off is that you need to perform more measurements and may need to keep track of the phase shifts between the various measures.

  Lynn

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  I'm very new to labview so please can someone me if Miss me something in it... Please help...

  Why people always post photos of their screws rather than the screws themselves or at least excerpts?  We can't tell from the picture what Version of LabVIEW, you use (so if we post code, you will not be able to open it), and we can not 'play' with your code and try without, ourselves, by hand, trying to recreate your diagram (sometimes very small).  Please, help us help you!

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  Restart your download installation files.
  

  
  

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  Hello world

  I do a simple task in Visual C++ and I use PCI-6221(37 pin).

  Basically, I want to send the same signal of "analog input" to the "analog output".

  at the same time (or almost), to make real-time application.

  Can someone provide me with sample program please.

  I would be grateful if you could provide me with the great tutorial that explains

  step by step everything about NOR-DAQmx for C/C++ programming.

  Best regards

  Khassan

  This is my code in C++, you can optimize it if that seems too messy. This code reads the analog input signals and exports it through the analog outputs.

  To make this code additional work of the directories include and library directories must be added to OR.

  I hope it helps someone.

  #include
  #include
  #include "NIDAQmx.h".
  #include

  #define DAQmxErrChk (functionCall) {if (DAQmxFailed (error = (functionCall))) {goto error ;}}

  int main (int argc, char * argv [])
  {
  Int32 error = 0;
  TaskHandle taskHandleRead = 0, taskHandleWrite = 0;
  Read Int32 = 0;
  float64 context [1000];
  char errBuffRead [2048] = {'\0'};
  char errBuffWrite [2048] = {'\0'};
  bool32 done = 0;
  Int32 wrote;

  DAQmxErrChk (DAQmxCreateTask("",&taskHandleRead));
  DAQmxErrChk (DAQmxCreateAIVoltageChan(taskHandleRead,"Dev1/ai0","",DAQmx_Val_Cfg_Default,-10.0,10.0,DAQmx_Val_Volts,NULL));
  DAQmxErrChk (DAQmxCfgSampClkTiming(taskHandleRead,"",100.0,DAQmx_Val_Rising,DAQmx_Val_ContSamps,0));
  DAQmxErrChk (DAQmxCreateTask("",&taskHandleWrite));
  DAQmxErrChk (DAQmxCreateAOVoltageChan(taskHandleWrite,"Dev1/ao0","",-10.0,10.0,DAQmx_Val_Volts,NULL));
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  DAQmxErrChk (DAQmxStartTask (taskHandleRead));
  DAQmxErrChk (DAQmxStartTask (taskHandleWrite));

  While (! fact &! _kbhit())

  {

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  DAQmxErrChk (DAQmxWriteAnalogF64(taskHandleWrite,read,0,10.0,DAQmx_Val_GroupByChannel,dataRead,&written,));

  }
  _getch();

  Error:
  If (DAQmxFailed (error))

  {
  DAQmxGetExtendedErrorInfo (errBuffRead, 2048);
  DAQmxGetExtendedErrorInfo (errBuffWrite, 2048);
  }
  If (taskHandleRead! = 0)

  {

  DAQmxStopTask (taskHandleRead);
  DAQmxClearTask (taskHandleRead);
  }
  If (taskHandleWrite! = 0)

  {

  DAQmxStopTask (taskHandleWrite);
  DAQmxClearTask (taskHandleWrite);
  }
  If {(DAQmxFailed (error))
  printf ("error DAQmx: %s\n",errBuffRead); ")
  printf ("error DAQmx: %s\n",errBuffWrite); ")
  }
  printf ("end of the program, press the Enter key to quit\n");
  GetChar ();
  return 0;
  }

• Determine which cluster and the array index element was clicked on table clusters

  Hello

  I'm overload of brain with dynamic events and references and nodes of property etc.

  I am trying to identify the cluster and the array index element that was clicked on table clusters

  This gives me the name of the element:

  

  Is this reasonable?  How can I get the index?

  Thank you

  Paul

  Hello

  Download the VI in this link (also attached).  It gives you the index of the array element that you clicked. Hope this will help you.

  Kind regards
  Nitz

  (Bravo to give good answers, mark it as a Solution If your problem is resolved)

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  original title: X3DAudio1_7.dll
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