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Selecting multiple files for reading

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qt5.12read all files
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  • Christian EhrlicherC Christian Ehrlicher

    @suslucoder But even then you should know how to iterate over a container, sorry.

    https://stackoverflow.com/questions/498455/best-way-to-iterate-through-a-container

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    deleted286
    wrote on last edited by
    #12

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

    Christian EhrlicherC 1 Reply Last reply
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    • jsulmJ jsulm

      @suslucoder Well this is Qt forum, not basic programming one. That's why people can give somewhat harsh replies if you ask about basic programming stuff not related to Qt. This is something you should understand.
      Iterating trough a list is one of the basic programming concepts. You should do some research for such basic stuff at your own before asking here. For example using Google you can find: https://stackoverflow.com/questions/16825376/qt-foreach-loop-ordering-vs-for-loop-for-qlist

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      deleted286
      wrote on last edited by
      #13

      @jsulm Okey.

      1 Reply Last reply
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      • D deleted286

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

        Christian EhrlicherC Offline
        Christian EhrlicherC Offline
        Christian Ehrlicher
        Lifetime Qt Champion
        wrote on 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
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        • JonBJ JonB

          @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 :-;

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          deleted286
          wrote on 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;
          
          jsulmJ 1 Reply Last reply
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          • D deleted286

            @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;
            
            jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by jsulm
            #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

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            • jsulmJ jsulm

              @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...

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              deleted286
              wrote on last edited by deleted286
              #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

              jsulmJ J.HilkJ 2 Replies Last reply
              0
              • D deleted286

                @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

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on 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

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                • jsulmJ jsulm

                  @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 last edited by
                  #19

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

                  jsulmJ 1 Reply Last reply
                  0
                  • D deleted286

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

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on 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

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                    • D deleted286

                      @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.HilkJ Offline
                      J.HilkJ Offline
                      J.Hilk
                      Moderators
                      wrote on 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.

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                      • J.HilkJ J.Hilk

                        @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 ?

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                        deleted286
                        wrote on last edited by
                        #22

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

                        1 Reply Last reply
                        0
                        • jsulmJ jsulm

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

                          D Offline
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                          deleted286
                          wrote on last edited by
                          #23

                          @jsulm No you are right

                          1 Reply Last reply
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