How to connect the signal of C++ with slot QML?

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  Before ask you, I searched for answers to this question, but I have not found a satisfactory example.

  I have set up a service network in C++ that performs queries to REST against a backend. An example query would be to download a given element, the id of the item.

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  In C++:
  QmlDocument * qml = QmlDocument::create("asset:///main.qml").parent(this);
  QML-> setContextProperty ("_app", this);

  In QML:
  {Page}
  onCreationCompleted: {}
  _APP.itemReceived.connect (onItemReceived)
  }

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• Connection of signals in C++ with slot in QML

  In my app.cpp class

  (1) I said a signal named 'activityStopSignal '.

  (2) in this class that I charge a qml file

  Here's my class c ++

  #ifndef ApplicationUI_HPP_
  #define ApplicationUI_HPP_
  #include 
  #include
  #include 
  
  #include 
  #include 
  #include 
  
  using namespace bb::data;
  using namespace bb::cascades;
  
  namespace bb
      {
          namespace cascades
              {
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                  class SqlConnection;
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  class ApplicationUI : public QObject
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      Q_OBJECT
  public:
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          void activityStopSignal(); ///here I have defined the signal
  
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  In this qml file

  (1) I set the location for the signal "activityStopSignal".

  (2) I gave the link with the signal and slot

  Here is my qml file

  import bb.cascades 1.0
  
  Page {
      Container {
          layout: DockLayout {
  
          }
  
          Container {
              layout: DockLayout {
  
              }
              ImageView {
                  imageSource: "asset:///images/logo.png"
              }
          }
          ActivityIndicator {
              id: activity
          }
  
      }
  
      onCreationCompleted:
      {
          activity.start();
          _myClass.activityStopSignal.connect(activityDone) //here i have given the connection to the signal
  
      }
  
      function activityDone() {
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  Now my problem is:

  When I try to call 'make activityStopSignal' the application crashes. Where Iam wrong please help me

  Here is the app.cpp file where Ian trying to broadcast the signal

  // Default empty project template
  #include "applicationui.hpp"
  #include 
  #include 
  #include 
  #include 
  
  using namespace bb::cascades;
  using namespace bb::system;
  using namespace bb::data;
  
  ApplicationUI::ApplicationUI(bb::cascades::Application *app)
  : QObject(app)
  {
        Initialise();
        QmlDocument *qml = QmlDocument::create("asset:///splashScreen.qml").parent(this);
        qml->setContextProperty("_myClass", this);
        AbstractPane *root = qml->createRootObject();
        app->setScene(root);
  
        postJsonRequests();
        emit activityStopSignal(); //here I emit the signal
  }
  

  Someone help me please

  the connection of the signal seems ok, I would say you delete the code in your function and use a simple console.log to see if she is called correctly.

  If you want to process the request json first before emitting the signal you should check your code, networking is async your postJsonRequest will probably return before the end of networking.

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  And qml

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  Page {
      id: mainPage
      content:
      Container {
      id: main
      Container {
      id: buttonHolder
      scrollMode: ScrollMode.None
              layout: StackLayout {
                  layoutDirection: LayoutDirection.LeftToRight
                  leftPadding: 5.0
                  rightPadding: 5.0
                  topPadding: 5.0
                  bottomPadding: 5.0
              }
              touchPropagationMode: TouchPropagationMode.None
              objectName: "buttonHolder"
              Button {
                  id: openButton
                  text: "Open"
              }
              Button {
                  id: closeButton
                  text: "Close"
                  onClicked: {
                  }
              }
              Button {
                  id: saveButton
                  text: "Save"
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                  }
              }
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                  }
              }
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              }
          }
  
      //********************************
          Container {
              id: textHolderArea
              layout: AbsoluteLayout {
              }
              topMargin: 5.0
              leftMargin: 1.0
              rightMargin: 1.0
              bottomMargin: 2.0
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                  id: textHolder
                  textStyle.fontStyleHint: FontStyleHint.Default
                  layoutProperties: AbsoluteLayoutProperties {
                  }
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                  rightMargin: 5.0
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                  objectName: "textHolder"
                  text: ""
              }
          }
      //********************************
      }
  }
  

  And I have no idea how call my app.cpp C++ slot in my main QML file

  Your buttons should an objectName set to be visible to C++, the id is only visible inside the QML.

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