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Qt proyect 4.8 mix with Qt 5.5

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c++ qtqt 4.8qt 5
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  • A Offline
    A Offline
    Arturo Pablo R
    wrote on 21 Apr 2016, 20:36 last edited by
    #1

    Hi to everyone i have the next question is possible use into qt project with 4.8 a dll, or .lib created with qt 5.X
    The case is next, i was assigned to old project, he was developed with qt 4.8 but i need add a new functionality, and for the time is hard the migration to Qt 5.x, (the functionality implemented json and http requests, this 2 things not exist in qt 4.8), and so i think if ¿i can create this functionalities with qt 5.x and export like with a dll or .lib for their use? (and what happens with their dependencies), or is better try to export to qt 5.x or implement directly this modules in qt 4.8.

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    • S Offline
      S Offline
      SGaist
      Lifetime Qt Champion
      wrote on 21 Apr 2016, 21:22 last edited by
      #2

      Hi,

      No you can't mix both series of libraries in the same projects.

      Unless you are using some specific stuff that's been removed in Qt 5, the Qt 4 to Qt 5 port is usually pretty painless.

      What function exactly do you need form Qt 5 that's not available in Qt 4 ?

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

      A 1 Reply Last reply 21 Apr 2016, 21:49
      0
      • S SGaist
        21 Apr 2016, 21:22

        Hi,

        No you can't mix both series of libraries in the same projects.

        Unless you are using some specific stuff that's been removed in Qt 5, the Qt 4 to Qt 5 port is usually pretty painless.

        What function exactly do you need form Qt 5 that's not available in Qt 4 ?

        A Offline
        A Offline
        Arturo Pablo R
        wrote on 21 Apr 2016, 21:49 last edited by Arturo Pablo R
        #3

        @SGaist the jsons classes and http post classes(exist by 3rd libraries), but now i'm try to port all the code from qt 4.8 to qt 5.5 (i hope have success)

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        • S Offline
          S Offline
          SGaist
          Lifetime Qt Champion
          wrote on 21 Apr 2016, 21:51 last edited by
          #4

          IIRC, there was already a QJson library available.

          What http post classes ? Qt 4 already provided QNetworkAccessManager.

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

          A 1 Reply Last reply 21 Apr 2016, 22:06
          0
          • S SGaist
            21 Apr 2016, 21:51

            IIRC, there was already a QJson library available.

            What http post classes ? Qt 4 already provided QNetworkAccessManager.

            A Offline
            A Offline
            Arturo Pablo R
            wrote on 21 Apr 2016, 22:06 last edited by
            #5

            @SGaist said:

            QNetworkAccessManager.

            ok, i know by Qjson (but is for a 3rd and i preffer use the official) i forget the existence of QNetworkAccessManager.

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            2/5

            21 Apr 2016, 21:22

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