Connection of signals (with parameter) in QML.

Similar Questions

• Connect the signal in the C++ QML?

  Hello

  Sorry in advance for this noobish question

  My QML, I'd like to call C++ function to call the camera and then on the saved photo, I would like to save the url for further processing.

  The invocation and the seizure of the URL does not work correctly.

  The problem is that I can't send a signal of C++ to QML to send the url to QML for further processing.

  Trigger from QML:
  
  Button {
     text: "Snapshot"
     onClicked: {
      app.invokeCamera();
     }
  }
  
  void App::invokeCamera() {
      InvokeRequest request;
      request.setTarget("sys.camera.card");
      request.setAction("bb.action.CAPTURE");
      QByteArray data;
      data.append("full");
      request.setData(getShareRecipeData());
      mInvokeManager->invoke(request);
  }
  
  void App::childCardDone(
          const bb::system::CardDoneMessage &doneMessage) {
      QString url = "";
      qDebug() << "childCardDone reason:" << doneMessage.reason();
      qDebug() << "childCardDone data:" << doneMessage.data();
  
      if (doneMessage.reason().compare("save") == 0) {
          url = "file://" + doneMessage.data();
      } else if (doneMessage.reason().compare("save") == 0) {
          showError(doneMessage.data());
      }
  // This doesn't seem to send to QML
      emit cameraCaptureCompleted(url);
  }
  
  In C++:
  
  signals:
      void cameraCaptureCompleted(const QString &url);
  

  QML to signal received (somehow this must be duplicated?)

  signal cameraCaptureCompleted (string imageLink)
  onCameraCaptureCompleted: {}
  Console.Debug ("link to the image:" + imageLink);

  }

  The onCameraCaptureCompleted never triggered. The console.debug ("link to the image:" + imageLink); did not show anything.

  Thanks for your help!

  OK, I went back and looked at your provided code again and I see you try to put your location of onCameraCaptureCompleted on the Page, which certainly won't work, since the Page is not the class that has the cameraCaptureCompleted signal. I suggest one of these three approaches:

  Page {   id: myPage
     attachedObjects: [
        App {
           id: myApp
           onCameraCaptureCompleted: {
              // ---Do your stuff
           }
        }
     }
  }
  

  ... or if you prefer the Manager to appear on the page do this way:

  Page {
     id: myPage
     attachedObjects: [
        App {
           id: myApp
        }
     }
     function cameraCaptureCompletedHandler( imageLink ) {
        // ---Do your stuff
     }
     onCreationCompleted: {
        myApp.cameraCaptureCompleted.connect(myPage.cameraCaptureCompletedHandler);
     }
  }
  

  If you don't want to mess with connect() you could do the last example that much too:

  Page {
     id: myPage
     attachedObjects: [
        App {
           id: myApp
           onCameraCaptureCompleted: {
              myPage.cameraCaptureCompletedHandler( imageLink );
           }
        }
     }
     function cameraCaptureCompletedHandler( imageLink ) {
        // ---Do your stuff
     }
  }
  

  Of course, all these examples assume that you have successfully exposed the App class to QML with qmlRegisterType(). The signal you want to respond to being on the App class, you must place your location, or connect the App::cameraCaptureCompleted signal to your location explicitly.

  Hope it is clearer to you now.

• Connect the signal to the PRC to slot QML

  Hi guys.,.

  Please help me with this

  I'm issuing a custom signal called imageLoaded of CPP that contains an image as a parameter. How can I connect this signal to a slot in QML and can access the image...?

  Thanks in advance...

  For example:

  import bb.cascades 1.0
  
  Page {
      id: myPage
      Container {
          layout: DockLayout {}
          Label {
              id: myLabel
              text: qsTr("Hello World")
              textStyle.base: SystemDefaults.TextStyles.BigText
              verticalAlignment: VerticalAlignment.Center
              horizontalAlignment: HorizontalAlignment.Center
          }
          Button {
              text: "Press me"
              onClicked: {
                  console.log("Boton clicked");
                  cppObject.imageLoaded.connect(onImageLoaded);
                  cppObject.executeCppFunction();
              }
  
          }
      }
  
      function onImageLoaded(message) {
          console.log("enter to slot in qml");
          myLabel.text = message;
      }
  }
  
  --------------------
  
  #ifndef ApplicationUI_HPP_
  #define ApplicationUI_HPP_
  
  #include 
  
  namespace bb { namespace cascades { class Application; }}
  
  class ApplicationUI : public QObject
  {
      Q_OBJECT
  public:
      ApplicationUI(bb::cascades::Application *app);
      virtual ~ApplicationUI() {}
  
      Q_INVOKABLE void executeCppFunction();
  
  signals:
      void imageLoaded(QString message);
  };
  
  #endif 
  
  #include "applicationui.hpp"
  
  #include 
  #include 
  #include 
  
  using namespace bb::cascades;
  
  ApplicationUI::ApplicationUI(bb::cascades::Application *app)
  : QObject(app)
  {
      QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
  
      QmlDocument::defaultDeclarativeEngine()->rootContext()->setContextProperty("cppObject", this);
  
      AbstractPane *root = qml->createRootObject();
      app->setScene(root);
  
  }
  
  void ApplicationUI::executeCppFunction() {
      emit imageLoaded("Hello from C++ Signal");
  }
  

• emitting signals with QList as parameter?

  Hey developers

  How can I pass a QList as an argument with a signal? He repeats to me

  "No such signal ConnectionService::downloadCompleted (QList, QString) '.

  I'm emitting the signal with a QList object and a QString. It's my signal

  void downloadCompleted(const QList &connections, const QString &error);
  

  And that's how I connect

  connect(&this->connectionService, SIGNAL(downloadCompleted(QList, QString)), this, SLOT(searchCompleted(QList, QString)));
  

  I have allso tried QList SIGNAL signature. But that no longer works.

  Thanks in advance.

  Spend a full type, i.e.

  Connect (& connectionService, SIGNAL (downloadCompleted (const QList&, const QString &)), this, SLOT (searchCompleted (const QList&, const QString &)));)))

  'const' and '&' can be omitted if it should also work:

  Connect (& connectionService, SIGNAL (downloadCompleted (QList, QString)), this, SLOT (searchCompleted (QList QString,)));

  UPD:

  Try saving the type:

  qRegisterMetaType< QList >("QList");
  

• connect multiple signals card NI USB-6341

  Hallo,

  I'm trying to connect the signals of several NI USB-6341 map.

  This map has 16 channels but not 32 pins available.

  for example if I want to connect a signal on channel 0 I connect to pins 1 and 2 and for channel 8, I have to connect to channels 2 and 3.

  If I connect only channels 0-7, it works but if I connect channel 8 I do not get the real value of this signal.

  any ideas?

  Thank you

  Theodore

  Theodore,

  This sounds like it should work.  Basically, you use AI0-3 and AI8 - 11 for your four differential signals.  This leaves you AI4 - 7 and AI12-15 free for single operation is complete.  The configuration of the terminal can be defined on each channel.  To do this, you can use DAQmx create channel several times to add channels with a different configuration to your task.  If you need details on it, let me know what environment you'll be programming, and I'll see if I can provide more specific assistance.

  Hope that helps,

  Dan

• Trouble to C++ signal to call a QML slot

  Hello

  I can't get a signal from C++ code to call a function of slit in my QML.  I have currently resembles right (compared to the examples I have seen online), but the slit function is never called.  Can you see a problem?  Here is my code:

  applicaitonui. HPP:

  class ApplicationUI: public QObject {
  Q_OBJECT
  public:
      ApplicationUI(bb::cascades::Application *app);
  
      virtual ~ApplicationUI() {
      }
  
  signals:
      void successfulAuthentication();
  
  private:
      ActivityIndicator *mActivityIndicator;
      QNetworkAccessManager *mNetworkAccessManager;
  };
  
  #endif
  

  applicationui.cpp:

  ApplicationUI::ApplicationUI(bb::cascades::Application *app) :
          QObject(app) {
  
      QmlDocument *qml = QmlDocument::create("asset:///main.qml").parent(this);
      qml->setContextProperty("app", this);
  
      AbstractPane *root = qml->createRootObject();
  
      mActivityIndicator = root->findChild("indicator");
  
      connect(this, SIGNAL(successfulAuthentication()), root,
              SLOT(onSuccessfulAuthentication()));
  
      // set created root object as a scene
      app->setScene(root);
  }
  

  main.cpp:

  ...
  
  emit successfulAuthentication();
  
  ...
  

  hand. QML:

  // Default empty project template
  import bb.cascades 1.0
  import bb.system 1.0
  
  NavigationPane {
      id: navigationPane
      Page {
          id: loginPage
          Container {
              layout: StackLayout {
                  orientation: LayoutOrientation.TopToBottom
              }
  
              ...
          }
      }
      function onSuccessfulAuthentication() {
          console.log("onSuccessfulAuthentication()");
      }
  }
  

  I don't know if it is possible to connect on the side of C++, but in QML, you can do something like:

  NavigationPane {
    onCreationCompleted: {
      app.successfulAuthentication.connect(onSuccessfulAuthentication)
  

  Or use the element of {QtQuick 1.0 connections (it should be placed in attachedObjects):

  http://supportforums.BlackBerry.com/T5/Cascades-development/QML-connections-element/m-p/2063301#M955...

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  Can I connect my iWatch with my iPad?

  N ° Apple Watch can only be paired to an iPhone 5 or above.

  iPads are not supported.

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• Why has my connection AirPort Extreme recently stopped with my Tablet Android and Windows 7 laptop, but connects very well with all Apple devices?

  Why has my connection AirPort Extreme recently stopped with my Tablet Android and Windows 7 laptop, but connects very well with all Apple devices?

  What exact model of AirPort Extreme do you have? Either have your tablet or laptop Win7 been updated recently? They were both able to connect before and not now OR they were never able to connect? Can the laptop Win7 access Internet when connected by Ethernet? One of these devices have problems connecting to other networks Wi - Fi?

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• Satellite L20-101: could not connect my TV with the svhs

  Hi guys,.

  I have a problem.
  I have a L20 - 101 and I can't connect my tv with my toshiba svhs output.
  I reinstalled the drivers for the motherboard and videography, what can I try?
  Thank you

  Okay, it looks like a really not nice problem.

  So, how do you try to switch to the TV? You have the possibility in your display properties, but not the machine * recognize * the TV? You also have the FN + F5 key combination to change the display, have you already tried?

  And regarding your display drivers (including vga you? nvidia or ati?)

  You can take a look here to find the latest drivers to work for mobile platforms:

  http://www.laptopvideo2go.com/
  http://www.OmegaDrivers.NET/

  Good luck buddy

• Securing internet connection Wi - Fi with Equium L10 and Belkin router

  Hello

  I installed a wireless belkin router on my laptop L10 and have an excellent connection to the internet - everything works fine. However, I would like to secure the connection to prevent indiscreet listening - I tried to do this under the encryption and authentication of the menus, but I'm not sure about the different acronyms used - eg Shared, WEP and WPA for example.

  I tried different combinations of these, but the laptop disconnects just from the router until I return to the connection 'open' standard with encryption disabled. Can someone point me in the right direction... ??

  Hello Dan

  Your router is unknown to me, but encryption is still working on the same path. Check the security settings of your router, then select security options. Set the encryption you want to use (WEP) and the password.
  Your device must be configured as described on this page
  http://LSS.wisc.edu/~Sara/wireless/pcwepconfig.htm

  If everything is done on the right track to avoid any problems. I also use WIFI at home with 64-bit encryption, and I spent 10 minutes for any configuration.

• After factory reset, I can not connect my iphone6 with itunes

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• Asslam o aliakum. I have a problem with itunes 12.3.2 it is not downloaded the 10 windows and when I connect m iphone with itunes and want to update to 9.2 says please download itunes new version for ios 9.2... help me with this... How to solve this probl

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  Greetings Dani56777,

  Thank you for using communities Support from Apple!

  I understand that you run Windows 10 and you must update iTunes to the latest version so that your iPhone will be recognized when connected. I do not know if you receive an error when you try to update iTunes or not.

  If you need information on how to update iTunes, please follow the instructions in the following link.

  Download the latest version of iTunes for Windows - Apple Support

  If you receive an error or alert, you can consider removing iTunes and all of its associated components and then reinstalling fresh iTunes on your computer. That would give you the latest version of iTunes. If you need execute this process, please follow the steps described in the following article.

  Remove iTunes Control Panel and its associated components

  Use the control panel to uninstall iTunes and software components in the following order:

  1. iTunes
  2. Apple Software Update
  3. Apple Mobile Device Support
  4. Hello
  5. Apple Application Support 32-bit
  6. Apple Application Support 64-bit

  On some systems, iTunes can install two versions of the Apple Application Support. What is expected. If both are present, do not forget to uninstall both versions.

  Do these elements in a different order, uninstall or uninstall only some of them. This could have unintended effects. After you uninstall a component, you may be asked to restart your computer. Wait to restart your computer until you finish remove all components.

  Remove and reinstall iTunes and software for Windows 7 and later versions - Apple Support components

  Have a great day!

• Trace the signal with little data

  Hello everyone,

  I have the problem of tracking. I would draw a signal I have greated. I store the profile of signals in a table and this table I want to give with "draw the waveform. The problem now is that my signal may have a minimum of 4 values. The function of "Draw the waveform" plots each position of the table in the graph. With 4 values, the result is a triangle signal but it is false, that the signal should be like a rectangle (signal Wave Drive). There is no action between that. I have the oscilloscope the correct signal with only values in the table.

  In the 1 following you can see the result. The signal has an offset of 5 V, just FYI. The signal should be the signal in the following 2 (orange).

  Hope someone can help me.

  Best regards

  Probably a trace type thin step in PlotWaveform will do what you want.

  You can experiment with styles of different path for example native of race graphs.prj: you can locate with finder example or simply search in the \userint folder.