Signal / slot interaction for two plugins in Qt

Question

So, I have a small application that downloads two plugins and connectthem. After loading the first plugin, it creates a shortcut without a title, which will be added to the main window. The second plugin creates an action that will be added to the menu. Therefore, my application just needs to download these plugins to connectthem. What do I mean by linking them? I mean that the shortcut plugin contains a slot that will change the name of the shortcut, and the action plugin has an announced signal. The application should beconnectaction plugin signal with tag slot. I do not know how to do that. I assume that in action the implementation of the plugin class is to connect a user signal using a standard signal (it fires). But in any case, this application does not work as I expected. How can I establish the correct connection in my application for a signal from one plugin and a slot from another plugin?

Here is my code for the Label plugin:

#include "LabelInterface.h"

class LabelPlugin : public LabelInterface {

    Q_OBJECT
    Q_INTERFACES(LabelInterface)

public:
    QLabel* label;
    QLabel* newLabel();
     LabelPlugin() {}
    ~LabelPlugin() {}

public slots:
    void setTextforLabel();
}; 

#include <QtGui>
#include "LabelPlugin.h"

QLabel* LabelPlugin::newLabel() {

    label = new QLabel("");
    return label;
}

void LabelPlugin::setTextforLabel() {

    label->setText("This plugin works fine");
}

// Exporta plugin-ul
Q_EXPORT_PLUGIN2 (labelplugin,LabelPlugin)

Action plugin:

    #include "ActionInterface.h"

    class ActionPlugin : public ActionInterface  {

        Q_OBJECT
        Q_INTERFACES (ActionInterface)

    public :
         QAction* myAction;
         QAction* newAction();

        ~ActionPlugin () {}
         ActionPlugin () {}

    public slots:
         void send_signal();

     signals :
         void pushMyAction();
    };

#include <QtGui>
#include "ActionPlugin.h"

QAction* ActionPlugin::newAction() {

    myAction = new QAction("Show text",this);

    return myAction;
}

void ActionPlugin::send_signal() {

    qDebug ()<<"Here";

    QAction::connect (this,SIGNAL(pushMyAction()),this,SIGNAL(triggered()));
}

Q_EXPORT_PLUGIN2 (actionplugin,ActionPlugin)

In my application, where I am trying to download plugins, I:

   foreach (QString fileName, appDir.entryList(QDir::Files)) {

        qDebug()<<QString(fileName);

        QPluginLoader pluginLoader(appDir.absoluteFilePath(fileName));

        QObject* plugin = pluginLoader.instance();

         if (plugin) {

            ActionInterface* myAction= qobject_cast<ActionInterface*>(plugin);

            if (myAction) {
                action_ = myAction;
                pluginMenu->addAction(action_->newAction());
            }

            LabelInterface* myLabel = qobject_cast<LabelInterface*>(plugin);

            if (myLabel) {
                label_=myLabel;
                layout->addWidget(label_->newLabel());
            }

            if (action_ && label_) {

                qDebug()<<"both loaded";

                action_->send_signal();
                connect(action_, SIGNAL(pushMyAction()),label_, SLOT(setTextforLabel()));
            }
            else qDebug() << "seems one plugin is not loaded";
        }
    }

Answer 1

QObject , connect. . , , - QObject, :

class MyInterface {
public:
    virtual operator QObject*() = 0;
};

, , ( , asQObject() ).