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Issue opening a QFile on Windows when the file name is read from command line and contains accents...

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #2

    Hi,

    Which OS are you using ?
    Could you provide a minimal compilable example to try it out ?

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

    mbruelM 1 Reply Last reply
    1
    • SGaistS SGaist

      Hi,

      Which OS are you using ?
      Could you provide a minimal compilable example to try it out ?

      mbruelM Offline
      mbruelM Offline
      mbruel
      wrote on last edited by
      #3

      @SGaist it's on the title, the issue is on Windows only. (I'm using 7 but it was reported on 10 too)
      I don't have a minimal example but alright I gonna make it, shouldn't be so long.

      1 Reply Last reply
      0
      • mbruelM Offline
        mbruelM Offline
        mbruel
        wrote on last edited by mbruel
        #4

        @SGaist so here is a minimal project: testQFileWithAccentsInName
        it's just a main:

        #include <QCoreApplication>
        #include <QCommandLineParser>
        #include <iostream>
        #include <QTextStream>
        #include <QFile>
        int main(int argc, char *argv[])
        {
            QCoreApplication a(argc, argv);
        
            const QString optInput = "input";
            const QList<QCommandLineOption> sCmdOptions = {
                {{"i", optInput}, "input file to upload (single file or directory), you can use it multiple times", optInput}
            };
            QCommandLineParser parser;
            parser.setApplicationDescription("testQFileWithAccentsInName");
            parser.addOptions(sCmdOptions);
        
            // Process the actual command line arguments given by the user
            QStringList args;
            for (int i = 0; i < argc; ++i)
                args << argv[i];
        
            QTextStream cout(stdout);
            if (!parser.parse(args) || !parser.isSet(optInput))
            {
                cout << QString("Error syntax... it should be: testQFileWithAccentsInName -i <path_to_file>\n");
                return 1;
            }
        
            std::cout << "argv[2] using stdio: " << argv[2] << "\n";
            cout << "argv[2] using QTextStream: " << argv[2] << "\n";
        
            QString filePath = parser.value(optInput);
            cout << "Try to open file " << filePath << "\n" << Qt::flush;
            QFile file(filePath);
            int res = file.open(QIODevice::ReadOnly|QIODevice::Text);
            cout << (res ? QString("OK\n")
                         : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                 << Qt::flush;
        
            filePath = argv[2];
            cout << "Try to open file2 " << filePath << "\n" << Qt::flush;
            QFile file2(filePath);
            res = file.open(QIODevice::ReadOnly|QIODevice::Text);
            cout << (res ? QString("OK\n")
                         : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                 << Qt::flush;
        
        
            return res ? 0 : 1;
        }
        

        So you need one command line option using -i then path to an existing file
        basically: testQFileWithAccentsInName.exe -i filePath

        If you run it a file named for example tést.txt it will fail to open it... (on Windows)

        alt text

        jeremy_kJ 1 Reply Last reply
        0
        • mbruelM mbruel

          @SGaist so here is a minimal project: testQFileWithAccentsInName
          it's just a main:

          #include <QCoreApplication>
          #include <QCommandLineParser>
          #include <iostream>
          #include <QTextStream>
          #include <QFile>
          int main(int argc, char *argv[])
          {
              QCoreApplication a(argc, argv);
          
              const QString optInput = "input";
              const QList<QCommandLineOption> sCmdOptions = {
                  {{"i", optInput}, "input file to upload (single file or directory), you can use it multiple times", optInput}
              };
              QCommandLineParser parser;
              parser.setApplicationDescription("testQFileWithAccentsInName");
              parser.addOptions(sCmdOptions);
          
              // Process the actual command line arguments given by the user
              QStringList args;
              for (int i = 0; i < argc; ++i)
                  args << argv[i];
          
              QTextStream cout(stdout);
              if (!parser.parse(args) || !parser.isSet(optInput))
              {
                  cout << QString("Error syntax... it should be: testQFileWithAccentsInName -i <path_to_file>\n");
                  return 1;
              }
          
              std::cout << "argv[2] using stdio: " << argv[2] << "\n";
              cout << "argv[2] using QTextStream: " << argv[2] << "\n";
          
              QString filePath = parser.value(optInput);
              cout << "Try to open file " << filePath << "\n" << Qt::flush;
              QFile file(filePath);
              int res = file.open(QIODevice::ReadOnly|QIODevice::Text);
              cout << (res ? QString("OK\n")
                           : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                   << Qt::flush;
          
              filePath = argv[2];
              cout << "Try to open file2 " << filePath << "\n" << Qt::flush;
              QFile file2(filePath);
              res = file.open(QIODevice::ReadOnly|QIODevice::Text);
              cout << (res ? QString("OK\n")
                           : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                   << Qt::flush;
          
          
              return res ? 0 : 1;
          }
          

          So you need one command line option using -i then path to an existing file
          basically: testQFileWithAccentsInName.exe -i filePath

          If you run it a file named for example tést.txt it will fail to open it... (on Windows)

          alt text

          jeremy_kJ Offline
          jeremy_kJ Offline
          jeremy_k
          wrote on last edited by
          #5

          Does the application create a QCoreApplication instance prior to reading the string? If not, try that. QCoreApplication::QCoreApplication initializes Qt's locale support.

          Asking a question about code? http://eel.is/iso-c++/testcase/

          mbruelM 1 Reply Last reply
          0
          • jeremy_kJ jeremy_k

            Does the application create a QCoreApplication instance prior to reading the string? If not, try that. QCoreApplication::QCoreApplication initializes Qt's locale support.

            mbruelM Offline
            mbruelM Offline
            mbruel
            wrote on last edited by
            #6

            @jeremy_k well it was, I removed it in the example cause it had the same result.
            anyway I put it back in the code.

            jsulmJ 1 Reply Last reply
            0
            • mbruelM mbruel

              @jeremy_k well it was, I removed it in the example cause it had the same result.
              anyway I put it back in the code.

              jsulmJ Offline
              jsulmJ Offline
              jsulm
              Lifetime Qt Champion
              wrote on last edited by
              #7

              @mbruel What do https://doc.qt.io/qt-5/qfiledevice.html#error and https://doc.qt.io/qt-5/qiodevice.html#errorString return?

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

              mbruelM 1 Reply Last reply
              0
              • jsulmJ jsulm

                @mbruel What do https://doc.qt.io/qt-5/qfiledevice.html#error and https://doc.qt.io/qt-5/qiodevice.html#errorString return?

                mbruelM Offline
                mbruelM Offline
                mbruel
                wrote on last edited by mbruel
                #8

                @jsulm code updated in the previous post or here on github
                The error is that it doesn't find the file... although it exists and has been provided using completion in the cmd.

                C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                Try to open file c:\Users\mb\Downloads\t?st.nzb
                ERROR #5: Le fichier spÚcifiÚ est introuvable....
                

                my Windows7 is installed in French in a VM using British keyboard on a Debian host with locale en_GB.UTF-8
                cf snapshot.
                alt text

                JonBJ 1 Reply Last reply
                0
                • mbruelM mbruel

                  @jsulm code updated in the previous post or here on github
                  The error is that it doesn't find the file... although it exists and has been provided using completion in the cmd.

                  C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                  Try to open file c:\Users\mb\Downloads\t?st.nzb
                  ERROR #5: Le fichier spÚcifiÚ est introuvable....
                  

                  my Windows7 is installed in French in a VM using British keyboard on a Debian host with locale en_GB.UTF-8
                  cf snapshot.
                  alt text

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

                  @mbruel
                  I don't know the answer, but may I throw out a couple of comments:

                  • I would start by seeing exactly what I receive in argv[2], and then relate that to QString/QCommandLineParser.

                  • I note that you type in e-acute character, yet when the code outputs the error message to the terminal it shows U-acute where it should show e-acute. Is there any significance/problem there?

                  mbruelM 1 Reply Last reply
                  0
                  • JonBJ JonB

                    @mbruel
                    I don't know the answer, but may I throw out a couple of comments:

                    • I would start by seeing exactly what I receive in argv[2], and then relate that to QString/QCommandLineParser.

                    • I note that you type in e-acute character, yet when the code outputs the error message to the terminal it shows U-acute where it should show e-acute. Is there any significance/problem there?

                    mbruelM Offline
                    mbruelM Offline
                    mbruel
                    wrote on last edited by mbruel
                    #10

                    @JonB I've updated the code above and here
                    Here is the output

                    C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                    argv[2] using stdio: c:\Users\mb\Downloads\tÚst.nzb
                    argv[2] using QTextStream: c:\Users\mb\Downloads\tÚst.nzb
                    Try to open file c:\Users\mb\Downloads\t?st.nzb
                    ERROR #5: Le fichier spÚcifiÚ est introuvable....
                    Try to open file2 c:\Users\mb\Downloads\t?st.nzb
                    ERROR #5: Le fichier spÚcifiÚ est introuvable....
                    

                    not sure why I see the e-acute é well when using completion and then as Ú when it is printed out...
                    no idea how works Windows locale.
                    as said it's a French Win7. I've the issue whatever keyboard (layout) I use on Windows (French or English). My laptop has a British keyboard and again the host is a Debian with LANG=en_GB.UTF-8

                    it doesn't seem related to QCommandLineParser as I've the same issue trying to open another QFile using directly a QString initialized with argv[2].

                    JonBJ 1 Reply Last reply
                    0
                    • mbruelM mbruel

                      @JonB I've updated the code above and here
                      Here is the output

                      C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                      argv[2] using stdio: c:\Users\mb\Downloads\tÚst.nzb
                      argv[2] using QTextStream: c:\Users\mb\Downloads\tÚst.nzb
                      Try to open file c:\Users\mb\Downloads\t?st.nzb
                      ERROR #5: Le fichier spÚcifiÚ est introuvable....
                      Try to open file2 c:\Users\mb\Downloads\t?st.nzb
                      ERROR #5: Le fichier spÚcifiÚ est introuvable....
                      

                      not sure why I see the e-acute é well when using completion and then as Ú when it is printed out...
                      no idea how works Windows locale.
                      as said it's a French Win7. I've the issue whatever keyboard (layout) I use on Windows (French or English). My laptop has a British keyboard and again the host is a Debian with LANG=en_GB.UTF-8

                      it doesn't seem related to QCommandLineParser as I've the same issue trying to open another QFile using directly a QString initialized with argv[2].

                      JonBJ Offline
                      JonBJ Offline
                      JonB
                      wrote on last edited by
                      #11

                      @mbruel said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                      same issue trying to open another QFile using directly a QString initialized with argv[2]

                      Personally I would want to try opening the file by, say, fopen(argv[2]). Like you I have "no idea how works Windows locale." and never have done :) But it would help me understand whether I have some QString/locale problem or something more fundamental about receiving the right characters from the command line/prompt.

                      1 Reply Last reply
                      0
                      • mbruelM Offline
                        mbruelM Offline
                        mbruel
                        wrote on last edited by mbruel
                        #12

                        @JonB code updated, it's opening the file read in the cmd when I use directly argv[2] on fopen

                        #include <QCoreApplication>
                        #include <iostream>
                        #include <cstdio>
                        
                        #include <QCommandLineParser>
                        #include <QTextStream>
                        #include <QFile>
                        int main(int argc, char *argv[])
                        {
                            QCoreApplication a(argc, argv);
                        
                            const QString optInput = "input";
                            const QList<QCommandLineOption> sCmdOptions = {
                                {{"i", optInput}, "input file to upload (single file or directory), you can use it multiple times", optInput}
                            };
                            QCommandLineParser parser;
                            parser.setApplicationDescription("testQFileWithAccentsInName");
                            parser.addOptions(sCmdOptions);
                        
                            // Process the actual command line arguments given by the user
                            QStringList args;
                            for (int i = 0; i < argc; ++i)
                                args << argv[i];
                        
                            QTextStream cout(stdout);
                            if (!parser.parse(args) || !parser.isSet(optInput))
                            {
                                cout << QString("Error syntax... it should be: testQFileWithAccentsInName -i <path_to_file>\n");
                                return 1;
                            }
                        
                            std::cout << "argv[2] using stdio: " << argv[2] << "\n";
                            cout << "argv[2] using QTextStream: " << argv[2] << "\n";
                        
                            QString filePath = parser.value(optInput);
                            cout << "Try to open file " << filePath << "\n" << Qt::flush;
                            QFile file(filePath);
                            int res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                            cout << (res ? QString("OK\n")
                                         : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                 << Qt::flush;
                        
                            filePath = argv[2];
                            cout << "\nTry to open file2 " << filePath << "\n" << Qt::flush;
                            QFile file2(filePath);
                            res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                            cout << (res ? QString("OK\n")
                                         : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                 << Qt::flush;
                        
                            FILE *cFile = fopen(argv[2], "r");
                            cout << "\nTry to open cFile using fopen on argv[2]\n" << Qt::flush;
                            cout << (cFile ? "OK\n" : "ERROR\n") << Qt::flush;
                            if (cFile)
                                fclose(cFile);
                        
                            return res ? 0 : 1;
                        }
                        

                        output:

                        C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                        argv[2] using stdio: c:\Users\mb\Downloads\tÚst.nzb
                        argv[2] using QTextStream: c:\Users\mb\Downloads\tÚst.nzb
                        Try to open file c:\Users\mb\Downloads\t?st.nzb
                        ERROR #5: Le fichier spÚcifiÚ est introuvable....
                        
                        Try to open file2 c:\Users\mb\Downloads\t?st.nzb
                        ERROR #5: Le fichier spÚcifiÚ est introuvable....
                        
                        Try to open cFile using fopen on argv[2]
                        OK
                        

                        So to me its a locale / QString issue. Following this link I've tried to play with QTextCodec::setCodeForLocale(QTextCodec::codecForName("utf-8")) or QString::toLocale8Bit() without success.
                        That's why I came ask for help here ;)

                        PS: I'm having the issue with the e-acute é but the issue was raised by Spanish people on their windows (without VM)

                        JonBJ Christian EhrlicherC 2 Replies Last reply
                        0
                        • mbruelM mbruel

                          @JonB code updated, it's opening the file read in the cmd when I use directly argv[2] on fopen

                          #include <QCoreApplication>
                          #include <iostream>
                          #include <cstdio>
                          
                          #include <QCommandLineParser>
                          #include <QTextStream>
                          #include <QFile>
                          int main(int argc, char *argv[])
                          {
                              QCoreApplication a(argc, argv);
                          
                              const QString optInput = "input";
                              const QList<QCommandLineOption> sCmdOptions = {
                                  {{"i", optInput}, "input file to upload (single file or directory), you can use it multiple times", optInput}
                              };
                              QCommandLineParser parser;
                              parser.setApplicationDescription("testQFileWithAccentsInName");
                              parser.addOptions(sCmdOptions);
                          
                              // Process the actual command line arguments given by the user
                              QStringList args;
                              for (int i = 0; i < argc; ++i)
                                  args << argv[i];
                          
                              QTextStream cout(stdout);
                              if (!parser.parse(args) || !parser.isSet(optInput))
                              {
                                  cout << QString("Error syntax... it should be: testQFileWithAccentsInName -i <path_to_file>\n");
                                  return 1;
                              }
                          
                              std::cout << "argv[2] using stdio: " << argv[2] << "\n";
                              cout << "argv[2] using QTextStream: " << argv[2] << "\n";
                          
                              QString filePath = parser.value(optInput);
                              cout << "Try to open file " << filePath << "\n" << Qt::flush;
                              QFile file(filePath);
                              int res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                              cout << (res ? QString("OK\n")
                                           : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                   << Qt::flush;
                          
                              filePath = argv[2];
                              cout << "\nTry to open file2 " << filePath << "\n" << Qt::flush;
                              QFile file2(filePath);
                              res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                              cout << (res ? QString("OK\n")
                                           : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                   << Qt::flush;
                          
                              FILE *cFile = fopen(argv[2], "r");
                              cout << "\nTry to open cFile using fopen on argv[2]\n" << Qt::flush;
                              cout << (cFile ? "OK\n" : "ERROR\n") << Qt::flush;
                              if (cFile)
                                  fclose(cFile);
                          
                              return res ? 0 : 1;
                          }
                          

                          output:

                          C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                          argv[2] using stdio: c:\Users\mb\Downloads\tÚst.nzb
                          argv[2] using QTextStream: c:\Users\mb\Downloads\tÚst.nzb
                          Try to open file c:\Users\mb\Downloads\t?st.nzb
                          ERROR #5: Le fichier spÚcifiÚ est introuvable....
                          
                          Try to open file2 c:\Users\mb\Downloads\t?st.nzb
                          ERROR #5: Le fichier spÚcifiÚ est introuvable....
                          
                          Try to open cFile using fopen on argv[2]
                          OK
                          

                          So to me its a locale / QString issue. Following this link I've tried to play with QTextCodec::setCodeForLocale(QTextCodec::codecForName("utf-8")) or QString::toLocale8Bit() without success.
                          That's why I came ask for help here ;)

                          PS: I'm having the issue with the e-acute é but the issue was raised by Spanish people on their windows (without VM)

                          JonBJ Offline
                          JonBJ Offline
                          JonB
                          wrote on last edited by
                          #13

                          @mbruel said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                          So to me its a locale / QString issue.

                          Indeed at least you have proved that! If it's doable via fopen(argv[2]) it must be doable via QFile(QString), somehow.

                          That's why I came ask for help here ;)

                          Hopefully someone else will answer, because I have never got my head around locales, Latin/UTF-8 characters et al... :)

                          mbruelM 1 Reply Last reply
                          0
                          • JonBJ JonB

                            @mbruel said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                            So to me its a locale / QString issue.

                            Indeed at least you have proved that! If it's doable via fopen(argv[2]) it must be doable via QFile(QString), somehow.

                            That's why I came ask for help here ;)

                            Hopefully someone else will answer, because I have never got my head around locales, Latin/UTF-8 characters et al... :)

                            mbruelM Offline
                            mbruelM Offline
                            mbruel
                            wrote on last edited by
                            #14

                            @JonB said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                            Hopefully someone else will answer, because I have never got my head around locales, Latin/UTF-8 characters et al... :)

                            same always been kind of a nightmare to me... haha

                            JonBJ 1 Reply Last reply
                            0
                            • mbruelM mbruel

                              @JonB code updated, it's opening the file read in the cmd when I use directly argv[2] on fopen

                              #include <QCoreApplication>
                              #include <iostream>
                              #include <cstdio>
                              
                              #include <QCommandLineParser>
                              #include <QTextStream>
                              #include <QFile>
                              int main(int argc, char *argv[])
                              {
                                  QCoreApplication a(argc, argv);
                              
                                  const QString optInput = "input";
                                  const QList<QCommandLineOption> sCmdOptions = {
                                      {{"i", optInput}, "input file to upload (single file or directory), you can use it multiple times", optInput}
                                  };
                                  QCommandLineParser parser;
                                  parser.setApplicationDescription("testQFileWithAccentsInName");
                                  parser.addOptions(sCmdOptions);
                              
                                  // Process the actual command line arguments given by the user
                                  QStringList args;
                                  for (int i = 0; i < argc; ++i)
                                      args << argv[i];
                              
                                  QTextStream cout(stdout);
                                  if (!parser.parse(args) || !parser.isSet(optInput))
                                  {
                                      cout << QString("Error syntax... it should be: testQFileWithAccentsInName -i <path_to_file>\n");
                                      return 1;
                                  }
                              
                                  std::cout << "argv[2] using stdio: " << argv[2] << "\n";
                                  cout << "argv[2] using QTextStream: " << argv[2] << "\n";
                              
                                  QString filePath = parser.value(optInput);
                                  cout << "Try to open file " << filePath << "\n" << Qt::flush;
                                  QFile file(filePath);
                                  int res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                                  cout << (res ? QString("OK\n")
                                               : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                       << Qt::flush;
                              
                                  filePath = argv[2];
                                  cout << "\nTry to open file2 " << filePath << "\n" << Qt::flush;
                                  QFile file2(filePath);
                                  res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                                  cout << (res ? QString("OK\n")
                                               : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                       << Qt::flush;
                              
                                  FILE *cFile = fopen(argv[2], "r");
                                  cout << "\nTry to open cFile using fopen on argv[2]\n" << Qt::flush;
                                  cout << (cFile ? "OK\n" : "ERROR\n") << Qt::flush;
                                  if (cFile)
                                      fclose(cFile);
                              
                                  return res ? 0 : 1;
                              }
                              

                              output:

                              C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                              argv[2] using stdio: c:\Users\mb\Downloads\tÚst.nzb
                              argv[2] using QTextStream: c:\Users\mb\Downloads\tÚst.nzb
                              Try to open file c:\Users\mb\Downloads\t?st.nzb
                              ERROR #5: Le fichier spÚcifiÚ est introuvable....
                              
                              Try to open file2 c:\Users\mb\Downloads\t?st.nzb
                              ERROR #5: Le fichier spÚcifiÚ est introuvable....
                              
                              Try to open cFile using fopen on argv[2]
                              OK
                              

                              So to me its a locale / QString issue. Following this link I've tried to play with QTextCodec::setCodeForLocale(QTextCodec::codecForName("utf-8")) or QString::toLocale8Bit() without success.
                              That's why I came ask for help here ;)

                              PS: I'm having the issue with the e-acute é but the issue was raised by Spanish people on their windows (without VM)

                              Christian EhrlicherC Online
                              Christian EhrlicherC Online
                              Christian Ehrlicher
                              Lifetime Qt Champion
                              wrote on last edited by
                              #15

                              @mbruel said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                              QStringList args;
                              for (int i = 0; i < argc; ++i)
                                  args << argv[i];
                              

                              wtf?

                              Use QCoreApplication::arguments() instead. What you do can't work at all since the command line does not pass the values utf-8 encoded.

                              Qt Online Installer direct download: https://download.qt.io/official_releases/online_installers/
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                              mbruelM 1 Reply Last reply
                              3
                              • mbruelM mbruel

                                @JonB said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                                Hopefully someone else will answer, because I have never got my head around locales, Latin/UTF-8 characters et al... :)

                                same always been kind of a nightmare to me... haha

                                JonBJ Offline
                                JonBJ Offline
                                JonB
                                wrote on last edited by
                                #16

                                @mbruel
                                I knew we needed a Qt expert here! @Christian-Ehrlicher understands things like UTF, Latin etc. ! ;-)
                                Take his advice.

                                1 Reply Last reply
                                1
                                • Christian EhrlicherC Christian Ehrlicher

                                  @mbruel said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                                  QStringList args;
                                  for (int i = 0; i < argc; ++i)
                                      args << argv[i];
                                  

                                  wtf?

                                  Use QCoreApplication::arguments() instead. What you do can't work at all since the command line does not pass the values utf-8 encoded.

                                  mbruelM Offline
                                  mbruelM Offline
                                  mbruel
                                  wrote on last edited by
                                  #17

                                  @Christian-Ehrlicher said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                                  @mbruel said in Issue opening a QFile on Windows when the file name is read from command line and contains accents...:

                                  QStringList args;
                                  for (int i = 0; i < argc; ++i)
                                      args << argv[i];
                                  

                                  wtf?

                                  Use QCoreApplication::arguments() instead. What you do can't work at all since the command line does not pass the values utf-8 encoded.

                                  Cool! first time I hear about QCoreApplication::arguments()...
                                  problem solved. (indeed my loop looked a bit dodgy/hacky... haha)
                                  Thanks \o/

                                  Updated code.

                                  #include <QCoreApplication>
                                  #include <iostream>
                                  #include <cstdio>
                                  
                                  #include <QCommandLineParser>
                                  #include <QTextStream>
                                  #include <QFile>
                                  int main(int argc, char *argv[])
                                  {
                                      QCoreApplication a(argc, argv);
                                  
                                      const QString optInput = "input";
                                      const QList<QCommandLineOption> sCmdOptions = {
                                          {{"i", optInput}, "input file to upload (single file or directory), you can use it multiple times", optInput}
                                      };
                                      QCommandLineParser parser;
                                      parser.setApplicationDescription("testQFileWithAccentsInName");
                                      parser.addOptions(sCmdOptions);
                                  
                                      QStringList args = QCoreApplication::arguments();
                                      QTextStream cout(stdout);
                                      if (!parser.parse(args) || !parser.isSet(optInput))
                                      {
                                          cout << QString("Error syntax... it should be: testQFileWithAccentsInName -i <path_to_file>\n");
                                          return 1;
                                      }
                                  
                                      std::cout << "argv[2] using stdio: " << argv[2] << "\n";
                                      cout << "argv[2] using QTextStream: " << argv[2] << "\n";
                                  
                                      QString filePath = parser.value(optInput);
                                      cout << "Try to open file using QCommandLineParser: " << filePath << "\n" << Qt::flush;
                                      QFile file(filePath);
                                      int res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                                      cout << (res ? QString("OK\n")
                                                   : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                           << Qt::flush;
                                      if (res)
                                          file.close();
                                  
                                      filePath = args.at(2);
                                      cout << "\nTry to open file using directly QCoreApplication::arguments: " << filePath << "\n" << Qt::flush;
                                      QFile file2(filePath);
                                      res = file.open(QIODevice::ReadOnly|QIODevice::Text);
                                      cout << (res ? QString("OK\n")
                                                   : QString("ERROR #%1: %2...\n").arg(file.error()).arg(file.errorString()))
                                           << Qt::flush;
                                  
                                      FILE *cFile = fopen(argv[2], "r");
                                      cout << "\nTry to open cFile using fopen on argv[2]\n" << Qt::flush;
                                      cout << (cFile ? "OK\n" : "ERROR\n") << Qt::flush;
                                      if (cFile)
                                          fclose(cFile);
                                  
                                      return res ? 0 : 1;
                                  }
                                  

                                  and output:

                                  C:\Users\mb>cd Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug\
                                  
                                  C:\Users\mb\Desktop\github\build-testQFileWithAccentsInName-Desktop_Qt_5_15_0_MinGW_64_bit-Debug\debug>testQFileWithAccentsInName.exe -i c:\Users\mb\Downloads\tést.nzb
                                  argv[2] using stdio: c:\Users\mb\Downloads\tÚst.nzb
                                  argv[2] using QTextStream: c:\Users\mb\Downloads\tÚst.nzb
                                  Try to open file using QCommandLineParser: c:\Users\mb\Downloads\tÚst.nzb
                                  OK
                                  
                                  Try to open file using directly QCoreApplication::arguments: c:\Users\mb\Downloads\tÚst.nzb
                                  OK
                                  
                                  Try to open cFile using fopen on argv[2]
                                  OK
                                  
                                  1 Reply Last reply
                                  0
                                  • C Offline
                                    C Offline
                                    ChrisW67
                                    wrote on last edited by
                                    #18

                                    I think you have been bitten by a character encoding issues.

                                    The file name looks like "tést.nzb" when viewed in the QtCreator execution parameters field.
                                    Internally this will be using a QString with the following Unicode code points (hex):

                                    t    é    s    t    .    n    z    b 
                                    0074 00E9 0073 0074 002E 006E 007A 0062
                                    

                                    The same logical characters can be encoded in Windows-1252 (Western Euro) or UTF-8:

                                    t  é     s  t  .  n  z  b
                                    74 E9    73 74 2E 6E 7A 62  Windows-1252, 8-bits per character
                                    74 C3 A9 73 74 2E 6E 7A 62  UTF-8, 8 to 32-bits per character
                                    

                                    It is these conversions that Qt toLocal8Bit() and fromLocal8Bit() and friends do.
                                    If a program expecting a Windows-1252 encode string was given bytes for the UTF-8 version you might see:

                                    tést.nzb
                                    

                                    Conversely, a Windows-1252 string fed to a program expecting UTF-8 would see that the byte E9 is not a valid UTF-8 encoding and substitute a "bad character" placeholder, often a "?".

                                    t?st.nzb
                                    

                                    This second option matches what your screen shot displays. This may not be exactly what is happening in your case, but it is indicative of the types of problem that can arise.

                                    1 Reply Last reply
                                    1
                                    • S Offline
                                      S Offline
                                      SimonSchroeder
                                      wrote on last edited by
                                      #19

                                      Here are a few things I have learned over the years:

                                      1. Make sure your source code files are stored as UTF-8 (if you have non-ASCII characters in there).
                                      2. Make sure you let the Microsoft compiler know that you are using UTF-8 (I don't remember the switches; there might be one for the source files and another one for the object files).
                                      3. On Windows add the code line setlocale(LC_ALL, ".UTF8"); which will make sure that std::cin, std::cout and all file I/O will be UTF-8 (also filenames!).

                                      The last one is the most important one. I guess this would also tell your program that your command line parameters are UTF-8.

                                      1 Reply Last reply
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