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Connection problem

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  • L Offline
    L Offline
    luca72
    wrote on last edited by
    #1

    Hello i have made one test but i have problem on connection:
    this is the .h file
    @class Widget : public QWidget
    {
    Q_OBJECT

    public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();

    private:

    QNetworkAccessManager *manager;
    QList<QNetworkReply *> currentDownloads;
    

    private slots:

    void scarico_file_lista();
    void leggo_manager(QNetworkReply *reply);
    

    };

    #endif // WIDGET_H@

    the .cpp is:

    @void Widget::scarico_file_lista(){
    QStringList lista_url ;
    lista_url << "http://www.test.net/44" << "http://www.test.net/45";
    for (int gytr = 0; gytr<lista_url.length(); gytr++){
    QUrl url;
    url = lista_url[gytr];
    manager = new QNetworkAccessManager;
    connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(leggo_manager(QNetworkReply *reply)));
    QNetworkRequest request(url);
    QNetworkReply *reply = manager->get(request);
    currentDownloads.append(reply);
    }

    }

    void Widget::leggo_manager(QNetworkReply *reply){
    int lllll = 0;
    }@
    I don't have the connection to the slot leggo_manager, wath is wrong?

    Thanks

    Luca

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    0
    • D Offline
      D Offline
      DenisKormalev
      wrote on last edited by
      #2

      Remove reply from SLOT in connect().

      1 Reply Last reply
      0
      • S Offline
        S Offline
        secretNinja
        wrote on last edited by
        #3

        "QObject::connect":http://doc.qt.nokia.com/4.7/qobject.html#connect

        bq. Note that the signal and slots parameters must not contain any variable names, only the type.

        1 Reply Last reply
        0
        • G Offline
          G Offline
          goetz
          wrote on last edited by
          #4

          And do not instantiate a new QNetworkAccessManager in every iteration of your loop! A single one is sufficient, create it just before you enter the loop. With your current solution you create a mass of memory leaks, as you loose every pointer but the last to the created QNetworkAccessManagers.

          http://www.catb.org/~esr/faqs/smart-questions.html

          1 Reply Last reply
          0
          • A Offline
            A Offline
            andre
            wrote on last edited by
            #5

            Even the last one is lost, as the manager pointer is out of scope after the loop and can not be referenced anymore after the loop has ended.

            1 Reply Last reply
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