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Selecting multiple files for reading

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  • D deleted286
    1 Feb 2021, 14:42

    @Christian-Ehrlicher yes I don't know, is it a shame that I don't know?

    C Offline
    C Offline
    Christian Ehrlicher
    Lifetime Qt Champion
    wrote on 1 Feb 2021, 16:08 last edited by
    #14

    @suslucoder Please start with basic c and c++ - everything else will not work out properly. And I'm pretty sure so will tell you the same.

    Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
    Visit the Qt Academy at https://academy.qt.io/catalog

    1 Reply Last reply
    1
    • J JonB
      1 Feb 2021, 14:37

      @suslucoder said in Selecting multiple files for reading:

      @JonB If I could think and do all of this at once, I wouldn't ask for help. You don't have to be this hard every time. I'm probably younger than you, and I'm making an effort to learn. It shouldn't be that hard to understand

      I think I explained it very gently & clearly! And told you what you need to do, and explained what the term "iteration" is. So I'm sorry you feel like that, I believe I am one of the people here who is prepared to explain things the most! :) Maybe, if you can, don't take my words as harsh, because they are not intended like that! I'm a pussy cat really :-;

      D Offline
      D Offline
      deleted286
      wrote on 2 Feb 2021, 12:10 last edited by
      #15

      @JonB I want to ask you something.

      I did it in the way you said. Now i can select multiple files.
      After selecting, i want to do some operations. But my code do it just for one file. The other files are not functional.

      Is there any way to do it like, do these for every different files.
      I will share you my iteration, i hope it is correct:

      Q_UNUSED(b);
      
         QStringList fileNames;
      
         fileNames = QFileDialog::getOpenFileNames(nullptr,
                                                   ("choose"), "up.sakla", ("choosen(*.up)"));
      
        for (auto xfile : fileNames)
        {
      
         QFile file (xfile);
         file.open(QIODevice::ReadOnly);
         QDataStream in(&file);    // read the data serialized from the file
         QString str;
         qint32 a;
           qDebug() << str << a;
         in >> str >> a;
      
      J 1 Reply Last reply 2 Feb 2021, 12:18
      0
      • D deleted286
        2 Feb 2021, 12:10

        @JonB I want to ask you something.

        I did it in the way you said. Now i can select multiple files.
        After selecting, i want to do some operations. But my code do it just for one file. The other files are not functional.

        Is there any way to do it like, do these for every different files.
        I will share you my iteration, i hope it is correct:

        Q_UNUSED(b);
        
           QStringList fileNames;
        
           fileNames = QFileDialog::getOpenFileNames(nullptr,
                                                     ("choose"), "up.sakla", ("choosen(*.up)"));
        
          for (auto xfile : fileNames)
          {
        
           QFile file (xfile);
           file.open(QIODevice::ReadOnly);
           QDataStream in(&file);    // read the data serialized from the file
           QString str;
           qint32 a;
             qDebug() << str << a;
           in >> str >> a;
        
        J Offline
        J Offline
        jsulm
        Lifetime Qt Champion
        wrote on 2 Feb 2021, 12:18 last edited by jsulm 2 Feb 2021, 12:19
        #16

        @suslucoder So, did you select more than one file? How many entries do you have in fileNames? Did you use debugger to see what happens?
        Add

        for (auto xfile : fileNames)
        {
            qDebug() << xfile;
        

        to see what happens. There are so many things you can do to find out what happens...

        https://forum.qt.io/topic/113070/qt-code-of-conduct

        D 1 Reply Last reply 2 Feb 2021, 12:21
        0
        • J jsulm
          2 Feb 2021, 12:18

          @suslucoder So, did you select more than one file? How many entries do you have in fileNames? Did you use debugger to see what happens?
          Add

          for (auto xfile : fileNames)
          {
              qDebug() << xfile;
          

          to see what happens. There are so many things you can do to find out what happens...

          D Offline
          D Offline
          deleted286
          wrote on 2 Feb 2021, 12:21 last edited by deleted286 2 Feb 2021, 12:22
          #17

          @jsulm said in Selecting multiple files for reading:

          qDebug() << xfile;

          Yes i select and i can see them. I want to do such a thing:

          do some operation
          for every file that i select

          J J 2 Replies Last reply 2 Feb 2021, 12:22
          0
          • D deleted286
            2 Feb 2021, 12:21

            @jsulm said in Selecting multiple files for reading:

            qDebug() << xfile;

            Yes i select and i can see them. I want to do such a thing:

            do some operation
            for every file that i select

            J Offline
            J Offline
            jsulm
            Lifetime Qt Champion
            wrote on 2 Feb 2021, 12:22 last edited by
            #18

            @suslucoder What do you think you print out to qDebug here:

            QString str;
            qint32 a;
            qDebug() << str << a;
            in >> str >> a;
            

            https://forum.qt.io/topic/113070/qt-code-of-conduct

            D 1 Reply Last reply 2 Feb 2021, 12:23
            0
            • J jsulm
              2 Feb 2021, 12:22

              @suslucoder What do you think you print out to qDebug here:

              QString str;
              qint32 a;
              qDebug() << str << a;
              in >> str >> a;
              
              D Offline
              D Offline
              deleted286
              wrote on 2 Feb 2021, 12:23 last edited by
              #19

              @jsulm I wrote it for see the content of my file. Im asking another thing..

              J 1 Reply Last reply 2 Feb 2021, 12:24
              0
              • D deleted286
                2 Feb 2021, 12:23

                @jsulm I wrote it for see the content of my file. Im asking another thing..

                J Offline
                J Offline
                jsulm
                Lifetime Qt Champion
                wrote on 2 Feb 2021, 12:24 last edited by
                #20

                @suslucoder Do you really think the order of the two last lines is correct?

                https://forum.qt.io/topic/113070/qt-code-of-conduct

                D 1 Reply Last reply 2 Feb 2021, 12:25
                1
                • D deleted286
                  2 Feb 2021, 12:21

                  @jsulm said in Selecting multiple files for reading:

                  qDebug() << xfile;

                  Yes i select and i can see them. I want to do such a thing:

                  do some operation
                  for every file that i select

                  J Online
                  J Online
                  J.Hilk
                  Moderators
                  wrote on 2 Feb 2021, 12:24 last edited by
                  #21

                  @suslucoder said in Selecting multiple files for reading:

                  I want to do such a thing:
                  do some operation
                  for every file that i select

                  so, what's stoping you ?


                  Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                  Q: What's that?
                  A: It's blue light.
                  Q: What does it do?
                  A: It turns blue.

                  D 1 Reply Last reply 2 Feb 2021, 12:25
                  0
                  • J J.Hilk
                    2 Feb 2021, 12:24

                    @suslucoder said in Selecting multiple files for reading:

                    I want to do such a thing:
                    do some operation
                    for every file that i select

                    so, what's stoping you ?

                    D Offline
                    D Offline
                    deleted286
                    wrote on 2 Feb 2021, 12:25 last edited by
                    #22

                    @J-Hilk I dont know how to do it. Im asking for any idea

                    1 Reply Last reply
                    0
                    • J jsulm
                      2 Feb 2021, 12:24

                      @suslucoder Do you really think the order of the two last lines is correct?

                      D Offline
                      D Offline
                      deleted286
                      wrote on 2 Feb 2021, 12:25 last edited by
                      #23

                      @jsulm No you are right

                      1 Reply Last reply
                      0

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