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std::filesystem crashes my app

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  • H Offline
    H Offline
    hbatalha
    wrote on last edited by
    #1

    I am trying to create a simple program using std::filesystem but my app is always crashing. I am on window using GCC 10.3.0, Qt 6.1.2.

    #include <QApplication>
    #include <fstream>
    #include <filesystem>
    
    // Driver program to test the above function
    int main(int argc, char *argv[])
    {
        QCoreApplication a(argc, argv);
    
        namespace fs = std::filesystem;
    
        std::ofstream of("teststxt");
    
        for(auto const& iter : fs::directory_iterator("binf"))
        {
            if(fs::is_regular_file(iter))
                of << iter.path().filename().string() << std::endl;
        }
        of.close();
    
        return a.exec();
    }
    

    If I comment out the code that uses std::filesystem it works fines.

    JonBJ 2 Replies Last reply
    0
    • H hbatalha

      I am trying to create a simple program using std::filesystem but my app is always crashing. I am on window using GCC 10.3.0, Qt 6.1.2.

      #include <QApplication>
      #include <fstream>
      #include <filesystem>
      
      // Driver program to test the above function
      int main(int argc, char *argv[])
      {
          QCoreApplication a(argc, argv);
      
          namespace fs = std::filesystem;
      
          std::ofstream of("teststxt");
      
          for(auto const& iter : fs::directory_iterator("binf"))
          {
              if(fs::is_regular_file(iter))
                  of << iter.path().filename().string() << std::endl;
          }
          of.close();
      
          return a.exec();
      }
      

      If I comment out the code that uses std::filesystem it works fines.

      JonBJ Offline
      JonBJ Offline
      JonB
      wrote on last edited by
      #2

      @hbatalha
      Well it doesn't look like whatever it is has anything to do with Qt. When you run in debugger what is the stack trace on "crash"?

      H 1 Reply Last reply
      2
      • JonBJ JonB

        @hbatalha
        Well it doesn't look like whatever it is has anything to do with Qt. When you run in debugger what is the stack trace on "crash"?

        H Offline
        H Offline
        hbatalha
        wrote on last edited by
        #3

        @JonB

        Well it doesn't look like whatever it is has anything to do with Qt.

        I ran this code in Code::Blocks and it worked fine. It does look like it has to do with Qt. But I will do some more digging and what might come up

        When you run in debugger what is the stack trace on "crash"?

        I tried running the debugger but it doesn't even start

        JonBJ 1 Reply Last reply
        0
        • H hbatalha

          @JonB

          Well it doesn't look like whatever it is has anything to do with Qt.

          I ran this code in Code::Blocks and it worked fine. It does look like it has to do with Qt. But I will do some more digging and what might come up

          When you run in debugger what is the stack trace on "crash"?

          I tried running the debugger but it doesn't even start

          JonBJ Offline
          JonBJ Offline
          JonB
          wrote on last edited by
          #4

          @hbatalha said in std::filesystem crashes my app:

          I tried running the debugger but it doesn't even start

          What "doesn't even start" --- the program from inside the debugger or the debugger itself?

          Anyway, I don't know what "Code::Blocks" might be, or what platform you are on. I only know of using gdb with gcc (e.g. under Linux), or Qt Creator will front-end that for you. Getting the debugger working is an important part of developing.

          H 1 Reply Last reply
          0
          • JonBJ JonB

            @hbatalha said in std::filesystem crashes my app:

            I tried running the debugger but it doesn't even start

            What "doesn't even start" --- the program from inside the debugger or the debugger itself?

            Anyway, I don't know what "Code::Blocks" might be, or what platform you are on. I only know of using gdb with gcc (e.g. under Linux), or Qt Creator will front-end that for you. Getting the debugger working is an important part of developing.

            H Offline
            H Offline
            hbatalha
            wrote on last edited by
            #5

            @JonB

            What "doesn't even start" --- the program from inside the debugger or the debugger itself?

            The debugger

            Anyway, I don't know what "Code::Blocks" might be, or what platform you are on.

            Code::Blocks is a C/C++ IDE and I am on Windows

            1 Reply Last reply
            0
            • SGaistS Offline
              SGaistS Offline
              SGaist
              Lifetime Qt Champion
              wrote on last edited by
              #6

              Hi,

              As @JonB suggested what does the debugger tell you ?
              By the way, how are you starting your application ?

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

              H 1 Reply Last reply
              0
              • SGaistS SGaist

                Hi,

                As @JonB suggested what does the debugger tell you ?
                By the way, how are you starting your application ?

                H Offline
                H Offline
                hbatalha
                wrote on last edited by
                #7

                @SGaist

                As @JonB suggested what does the debugger tell you ?

                The debugger doesn't start

                By the way, how are you starting your application ?

                I don't understand what you mean?

                SGaistS 1 Reply Last reply
                0
                • Kent-DorfmanK Offline
                  Kent-DorfmanK Offline
                  Kent-Dorfman
                  wrote on last edited by
                  #8

                  @hbatalha said in std::filesystem crashes my app:

                  QCoreApplication

                  Are you sure you're using the -std=c++17 or greater on compilation?
                  Have you read the gcc errata on std::filesystem and its implementation differences on different platforms?

                  std::filesystem was a boost library prior to c++17 and has a list of features that may not be completely supported in different g++ versions on windows.

                  can you implement your desired behaviour using the Qt filesystem module?

                  1 Reply Last reply
                  0
                  • H hbatalha

                    I am trying to create a simple program using std::filesystem but my app is always crashing. I am on window using GCC 10.3.0, Qt 6.1.2.

                    #include <QApplication>
                    #include <fstream>
                    #include <filesystem>
                    
                    // Driver program to test the above function
                    int main(int argc, char *argv[])
                    {
                        QCoreApplication a(argc, argv);
                    
                        namespace fs = std::filesystem;
                    
                        std::ofstream of("teststxt");
                    
                        for(auto const& iter : fs::directory_iterator("binf"))
                        {
                            if(fs::is_regular_file(iter))
                                of << iter.path().filename().string() << std::endl;
                        }
                        of.close();
                    
                        return a.exec();
                    }
                    

                    If I comment out the code that uses std::filesystem it works fines.

                    JonBJ Offline
                    JonBJ Offline
                    JonB
                    wrote on last edited by JonB
                    #9

                    @hbatalha said in std::filesystem crashes my app:

                    If I comment out the code that uses std::filesystem it works fines.

                    In addition to @Kent-Dorfman's comments. What about if you comment out the 3 lines using anything Qt (#include, QCoreApplication, a.exec())? If that still misbehaves you have a fully non-Qt exemplar.

                    1 Reply Last reply
                    0
                    • H hbatalha

                      @SGaist

                      As @JonB suggested what does the debugger tell you ?

                      The debugger doesn't start

                      By the way, how are you starting your application ?

                      I don't understand what you mean?

                      SGaistS Offline
                      SGaistS Offline
                      SGaist
                      Lifetime Qt Champion
                      wrote on last edited by
                      #10

                      @hbatalha said in std::filesystem crashes my app:

                      I don't understand what you mean?

                      Are you starting it from Qt Creator ? The command line ?

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

                      H 1 Reply Last reply
                      0
                      • SGaistS SGaist

                        @hbatalha said in std::filesystem crashes my app:

                        I don't understand what you mean?

                        Are you starting it from Qt Creator ? The command line ?

                        H Offline
                        H Offline
                        hbatalha
                        wrote on last edited by
                        #11

                        @SGaist

                        Are you starting it ? The command line ?

                        from Qt Creator

                        1 Reply Last reply
                        0

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