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[SOLVED]Qt Plugin metadata

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  • M Offline
    M Offline
    mbnoimi
    wrote on last edited by
    #4

    [quote author="MichelS" date="1372677981"]You could define an int version() call in your interface:

    @
    abstract int version()=0;
    @

    and override this in your derived Plugin.[/quote]

    Actually this is first solution pinged in head but I want to kknow how to get benefit of Plugin Metadata

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    • M Offline
      M Offline
      mbnoimi
      wrote on last edited by
      #5

      [quote author="SGaist" date="1372680937"]Hi,

      Did you add the Q_PLUGIN_METADATA line in your plugin header ?[/quote]

      Sure,

      @class MyPlugin : public QObject, Interface
      {
      Q_OBJECT
      #if QT_VERSION >= 0x050000
      Q_PLUGIN_METADATA(IID "ly.ecs.plugin.0.0.2" FILE "Plugin.json")
      Q_INTERFACES(Interface)
      #endif // QT_VERSION >= 0x050000

      public:
      MyPlugin(QObject parent = 0);
      QPushButton
      someObject(QWidget *parent=0);
      };@

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      • B Offline
        B Offline
        Buggy
        wrote on last edited by
        #6

        Based on my own experience I am kind of skeptical whenever those macros are involved. Have you tried to re-run qmake (Build - run qmake)? For me, this fixed an error I had been chasing for over an hour...

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        • M Offline
          M Offline
          mbnoimi
          wrote on last edited by
          #7

          [quote author="Buggy" date="1372753860"]Based on my own experience I am kind of skeptical whenever those macros are involved. Have you tried to re-run qmake (Build - run qmake)? For me, this fixed an error I had been chasing for over an hour...[/quote]

          sure I did.
          I'm asking about the principle not fixing a problem.

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          • M Offline
            M Offline
            mbnoimi
            wrote on last edited by
            #8

            I'm still stick to this issue and couldn't find any way to fix it. I need metadata to be able to read plugin information before loading it which metadata offers it.

            P.S. I'm using Qt 5.1

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            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #9

              Hi,

              Did you dump the content of pluginLoader.metaData() ?

              I just tried with a simple plugin and got the value of name using:
              @pluginLoader.metaData().value("MetaData").toObject().value("name").toString();@

              Also don't forget to "touch" the plugin header file before rebuilding to take the json file modifications in account.

              Interested in AI ? www.idiap.ch
              Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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              • D Offline
                D Offline
                dbzhang800
                wrote on last edited by
                #10

                As AGalst suggested, you forget the key "MetaData" if you want to get access the json file contents passed in the Q_PLUGIN_METADATA. Other information such as IID can be access through the key "IID" etc.

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                • M Offline
                  M Offline
                  mbnoimi
                  wrote on last edited by
                  #11

                  Thanks a lot guys, it works fine.

                  I wonder does this info mentioned in Qt docs?

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                  • SGaistS Offline
                    SGaistS Offline
                    SGaist
                    Lifetime Qt Champion
                    wrote on last edited by
                    #12

                    You're welcome !

                    From the ones I searched through, no, this call for an update to the documentation

                    Interested in AI ? www.idiap.ch
                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • M Offline
                      M Offline
                      mbnoimi
                      wrote on last edited by
                      #13

                      [quote]From the ones I searched through, no, this call for an update to the documentation[/quote]

                      Usually I create wiki page for missing docs but because I haven't the suitable knowledge about Qt Plugins, May you please create a wiki page.

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                      • SGaistS Offline
                        SGaistS Offline
                        SGaist
                        Lifetime Qt Champion
                        wrote on last edited by
                        #14

                        Correction to the doc would have a wider impact. Can you point me to your wiki entries so I can see what would be a good addition to the official documentation ?

                        Interested in AI ? www.idiap.ch
                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                        • M Offline
                          M Offline
                          mbnoimi
                          wrote on last edited by
                          #15

                          bq. Can you point me to your wiki entries

                          I didn't write any entries I just suggested to add them by you.

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #16

                            For the quick road, I have added a doc note

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                            • M Offline
                              M Offline
                              mbnoimi
                              wrote on last edited by
                              #17

                              [quote author="SGaist" date="1375821248"]For the quick road, I have added a doc note[/quote]

                              Thanks a lot :)

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                              • K Offline
                                K Offline
                                kshots
                                wrote on last edited by
                                #18

                                Definately much appreciated. I was trying to use the new metadata interface for the same reasons, and found the same lack of details in the docs. I have my own implementation working properly now (thanks to this thread), but it would be nice to have some references in the docs about this metadata and json structure.

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