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how to open a file in my qt app via double clicking on it

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  • SGaistS SGaist

    Can you try again using QCommandLineParser ?

    _ Offline
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    _-mohamed-_
    wrote on last edited by _-mohamed-_
    #5

    @SGaist how can i use QCommandLineParser to get application's arguments

    eyllanescE 1 Reply Last reply
    0
    • _ _-mohamed-_

      @SGaist how can i use QCommandLineParser to get application's arguments

      eyllanescE Offline
      eyllanescE Offline
      eyllanesc
      wrote on last edited by
      #6

      @_-mohamed-_ See the official example: https://doc.qt.io/qt-5/qcommandlineparser.html#details

      If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

      1 Reply Last reply
      0
      • _ Offline
        _ Offline
        _-mohamed-_
        wrote on last edited by
        #7

        @eyllanesc
        @SGaist
        i cant get application's arguments using QCommandLineParser

        eyllanescE 1 Reply Last reply
        0
        • _ _-mohamed-_

          @eyllanesc
          @SGaist
          i cant get application's arguments using QCommandLineParser

          eyllanescE Offline
          eyllanescE Offline
          eyllanesc
          wrote on last edited by
          #8

          @_-mohamed-_ Basic rule of the forum: Without code we cannot help you. Show the code where you implement the logic with QCommandLineParser, so we can analyze where the error is and so we can probably give you a solution.

          If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

          _ 1 Reply Last reply
          1
          • eyllanescE eyllanesc

            @_-mohamed-_ Basic rule of the forum: Without code we cannot help you. Show the code where you implement the logic with QCommandLineParser, so we can analyze where the error is and so we can probably give you a solution.

            _ Offline
            _ Offline
            _-mohamed-_
            wrote on last edited by
            #9

            @eyllanesc I just don't know how to do that

            I tried

            QCommandLineParser command;
            
               QStringList arguments = command.positionalArguments();
               if(arguments.count() > 1)
               {
            
                   QFile file(arguments.at(1));
            
                   if(!file.open(QFile::ReadOnly | QFile::Text))
                       QMessageBox::information(this, "can't open file", "can't open the specified file");
            
                   else
                   {
                       QTextStream text(&file);
                       text.setCodec("UTF-8");
                       QString fileContents = text.readAll();
                       ui->TextEdit->setPlainText(fileContents);
                       file.close();
            
                       edited = false;
                       url = arguments.at(1);
                       changeTitle();
                   }
               }
            
            eyllanescE 1 Reply Last reply
            0
            • _ _-mohamed-_

              @eyllanesc I just don't know how to do that

              I tried

              QCommandLineParser command;
              
                 QStringList arguments = command.positionalArguments();
                 if(arguments.count() > 1)
                 {
              
                     QFile file(arguments.at(1));
              
                     if(!file.open(QFile::ReadOnly | QFile::Text))
                         QMessageBox::information(this, "can't open file", "can't open the specified file");
              
                     else
                     {
                         QTextStream text(&file);
                         text.setCodec("UTF-8");
                         QString fileContents = text.readAll();
                         ui->TextEdit->setPlainText(fileContents);
                         file.close();
              
                         edited = false;
                         url = arguments.at(1);
                         changeTitle();
                     }
                 }
              
              eyllanescE Offline
              eyllanescE Offline
              eyllanesc
              wrote on last edited by
              #10

              @_-mohamed-_ Your sentence: i cant get application's arguments using QCommandLineParser is confusing. You should have said I don't know how to implement, why don't you use the official example? Try it and when it fails, they receive goods with the code that does not work.

              If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

              _ 1 Reply Last reply
              0
              • eyllanescE eyllanesc

                @_-mohamed-_ Your sentence: i cant get application's arguments using QCommandLineParser is confusing. You should have said I don't know how to implement, why don't you use the official example? Try it and when it fails, they receive goods with the code that does not work.

                _ Offline
                _ Offline
                _-mohamed-_
                wrote on last edited by
                #11

                @eyllanesc
                when i use args like qDebug() << args.at(0); i got this The program has unexpectedly finished.

                eyllanescE 1 Reply Last reply
                0
                • _ _-mohamed-_

                  @eyllanesc
                  when i use args like qDebug() << args.at(0); i got this The program has unexpectedly finished.

                  eyllanescE Offline
                  eyllanescE Offline
                  eyllanesc
                  wrote on last edited by eyllanesc
                  #12

                  @_-mohamed-_ what is args?, please provide a minimal and verifiable example.

                  If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

                  _ 1 Reply Last reply
                  0
                  • eyllanescE eyllanesc

                    @_-mohamed-_ what is args?, please provide a minimal and verifiable example.

                    _ Offline
                    _ Offline
                    _-mohamed-_
                    wrote on last edited by
                    #13

                    @eyllanesc it is from the official example

                    const QStringList args = parser.positionalArguments();
                       // source is args.at(0), destination is args.at(1)
                    

                    you can find it here:

                    int main(int argc, char *argv[])
                    {
                        QCoreApplication app(argc, argv);
                        QCoreApplication::setApplicationName("my-copy-program");
                        QCoreApplication::setApplicationVersion("1.0");
                    
                        QCommandLineParser parser;
                        parser.setApplicationDescription("Test helper");
                        parser.addHelpOption();
                        parser.addVersionOption();
                        parser.addPositionalArgument("source", QCoreApplication::translate("main", "Source file to copy."));
                        parser.addPositionalArgument("destination", QCoreApplication::translate("main", "Destination directory."));
                    
                        // A boolean option with a single name (-p)
                        QCommandLineOption showProgressOption("p", QCoreApplication::translate("main", "Show progress during copy"));
                        parser.addOption(showProgressOption);
                    
                        // A boolean option with multiple names (-f, --force)
                        QCommandLineOption forceOption(QStringList() << "f" << "force",
                                QCoreApplication::translate("main", "Overwrite existing files."));
                        parser.addOption(forceOption);
                    
                        // An option with a value
                        QCommandLineOption targetDirectoryOption(QStringList() << "t" << "target-directory",
                                QCoreApplication::translate("main", "Copy all source files into <directory>."),
                                QCoreApplication::translate("main", "directory"));
                        parser.addOption(targetDirectoryOption);
                    
                        // Process the actual command line arguments given by the user
                        parser.process(app);
                    
                        const QStringList args = parser.positionalArguments();
                        // source is args.at(0), destination is args.at(1)
                    
                        bool showProgress = parser.isSet(showProgressOption);
                        bool force = parser.isSet(forceOption);
                        QString targetDir = parser.value(targetDirectoryOption);
                        // ...
                    }
                    
                    eyllanescE 1 Reply Last reply
                    0
                    • _ _-mohamed-_

                      @eyllanesc it is from the official example

                      const QStringList args = parser.positionalArguments();
                         // source is args.at(0), destination is args.at(1)
                      

                      you can find it here:

                      int main(int argc, char *argv[])
                      {
                          QCoreApplication app(argc, argv);
                          QCoreApplication::setApplicationName("my-copy-program");
                          QCoreApplication::setApplicationVersion("1.0");
                      
                          QCommandLineParser parser;
                          parser.setApplicationDescription("Test helper");
                          parser.addHelpOption();
                          parser.addVersionOption();
                          parser.addPositionalArgument("source", QCoreApplication::translate("main", "Source file to copy."));
                          parser.addPositionalArgument("destination", QCoreApplication::translate("main", "Destination directory."));
                      
                          // A boolean option with a single name (-p)
                          QCommandLineOption showProgressOption("p", QCoreApplication::translate("main", "Show progress during copy"));
                          parser.addOption(showProgressOption);
                      
                          // A boolean option with multiple names (-f, --force)
                          QCommandLineOption forceOption(QStringList() << "f" << "force",
                                  QCoreApplication::translate("main", "Overwrite existing files."));
                          parser.addOption(forceOption);
                      
                          // An option with a value
                          QCommandLineOption targetDirectoryOption(QStringList() << "t" << "target-directory",
                                  QCoreApplication::translate("main", "Copy all source files into <directory>."),
                                  QCoreApplication::translate("main", "directory"));
                          parser.addOption(targetDirectoryOption);
                      
                          // Process the actual command line arguments given by the user
                          parser.process(app);
                      
                          const QStringList args = parser.positionalArguments();
                          // source is args.at(0), destination is args.at(1)
                      
                          bool showProgress = parser.isSet(showProgressOption);
                          bool force = parser.isSet(forceOption);
                          QString targetDir = parser.value(targetDirectoryOption);
                          // ...
                      }
                      
                      eyllanescE Offline
                      eyllanescE Offline
                      eyllanesc
                      wrote on last edited by
                      #14

                      @_-mohamed-_ How have you run your executable? You must run: your_executable input_filename output_filename.

                      If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

                      _ 1 Reply Last reply
                      0
                      • eyllanescE eyllanesc

                        @_-mohamed-_ How have you run your executable? You must run: your_executable input_filename output_filename.

                        _ Offline
                        _ Offline
                        _-mohamed-_
                        wrote on last edited by _-mohamed-_
                        #15

                        @eyllanesc
                        I run the app from qt creator

                        but the first argument should be the exe file path and it does not need second argument.
                        It should work when i call the first argument

                        eyllanescE 1 Reply Last reply
                        0
                        • _ _-mohamed-_

                          @eyllanesc
                          I run the app from qt creator

                          but the first argument should be the exe file path and it does not need second argument.
                          It should work when i call the first argument

                          eyllanescE Offline
                          eyllanescE Offline
                          eyllanesc
                          wrote on last edited by eyllanesc
                          #16

                          @_-mohamed-_ No, precisely QCommandLineParser considers that it is not necessary and only obtains the arguments, not the name of the program. If you want to know the name of the executable then use QFileInfo(QCoreApplication::applicationFilePath()).fileName().

                          The format is:

                          executable arg1 arg2 ... argN
                          

                          The executable name is not a program argument for QCommandLineParser.

                          If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

                          _ 1 Reply Last reply
                          0
                          • eyllanescE eyllanesc

                            @_-mohamed-_ No, precisely QCommandLineParser considers that it is not necessary and only obtains the arguments, not the name of the program. If you want to know the name of the executable then use QFileInfo(QCoreApplication::applicationFilePath()).fileName().

                            The format is:

                            executable arg1 arg2 ... argN
                            

                            The executable name is not a program argument for QCommandLineParser.

                            _ Offline
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                            _-mohamed-_
                            wrote on last edited by
                            #17

                            @eyllanesc oh,
                            I thought it was likeQCoreApplication::arguments()

                            I need the second argument which is the path of the file I want to open

                            eyllanescE 1 Reply Last reply
                            0
                            • _ _-mohamed-_

                              @eyllanesc oh,
                              I thought it was likeQCoreApplication::arguments()

                              I need the second argument which is the path of the file I want to open

                              eyllanescE Offline
                              eyllanescE Offline
                              eyllanesc
                              wrote on last edited by eyllanesc
                              #18

                              @_-mohamed-_ If you want to pass arguments using Qt Creator then click on the "Projects" on the left side and press the "Run" button, then put the arguments in "Command Line Arguments"

                              If you want me to help you develop some work then you can write to my email: e.yllanescucho@gmal.com.

                              _ 1 Reply Last reply
                              3
                              • eyllanescE eyllanesc

                                @_-mohamed-_ If you want to pass arguments using Qt Creator then click on the "Projects" on the left side and press the "Run" button, then put the arguments in "Command Line Arguments"

                                _ Offline
                                _ Offline
                                _-mohamed-_
                                wrote on last edited by _-mohamed-_
                                #19

                                @eyllanesc oh thanks this information will help me and save my time.

                                I tried to get the argument using QCommandLineParser, I got the same result
                                (C:\Users\moham\OneDrive\Desktop\????.txt)

                                note: when I open the same file using windows notepad it workes fine.

                                this is main.cpp:

                                #include "mainwindow.h"
                                #include <QApplication>
                                #include <QDebug>
                                using namespace std;
                                
                                int main(int argc, char *argv[])
                                {    
                                    QApplication a(argc, argv);
                                
                                    QCommandLineParser parser;
                                    parser.process(a);
                                
                                    QStringList args = parser.positionalArguments();
                                
                                    MainWindow w;
                                    w.settext(args.at(0));
                                
                                    w.show();
                                    return a.exec();
                                }
                                

                                and this is settext() function from mainwindow.cpp:

                                void MainWindow::settext(QString URL)
                                {
                                    QStringList arguments = QCoreApplication::arguments();
                                    if(arguments.count() > 1)
                                    {
                                
                                        QFile file(URL);
                                
                                        if(!file.open(QFile::ReadOnly | QFile::Text))
                                            QMessageBox::information(this, "can't open file", "can't open the specified file");
                                
                                        else
                                        {
                                            QTextStream text(&file);
                                            text.setCodec("UTF-8");
                                            QString fileContents = text.readAll();
                                            ui->TextEdit->setPlainText(fileContents);
                                            file.close();
                                
                                            edited = false;
                                            url = URL;
                                            changeTitle();
                                        }
                                    }
                                }
                                

                                when i double click the text file i got error(QMessageBox::information(this, "can't open file", "can't open the specified file");)

                                JonBJ 1 Reply Last reply
                                0
                                • _ _-mohamed-_

                                  @eyllanesc oh thanks this information will help me and save my time.

                                  I tried to get the argument using QCommandLineParser, I got the same result
                                  (C:\Users\moham\OneDrive\Desktop\????.txt)

                                  note: when I open the same file using windows notepad it workes fine.

                                  this is main.cpp:

                                  #include "mainwindow.h"
                                  #include <QApplication>
                                  #include <QDebug>
                                  using namespace std;
                                  
                                  int main(int argc, char *argv[])
                                  {    
                                      QApplication a(argc, argv);
                                  
                                      QCommandLineParser parser;
                                      parser.process(a);
                                  
                                      QStringList args = parser.positionalArguments();
                                  
                                      MainWindow w;
                                      w.settext(args.at(0));
                                  
                                      w.show();
                                      return a.exec();
                                  }
                                  

                                  and this is settext() function from mainwindow.cpp:

                                  void MainWindow::settext(QString URL)
                                  {
                                      QStringList arguments = QCoreApplication::arguments();
                                      if(arguments.count() > 1)
                                      {
                                  
                                          QFile file(URL);
                                  
                                          if(!file.open(QFile::ReadOnly | QFile::Text))
                                              QMessageBox::information(this, "can't open file", "can't open the specified file");
                                  
                                          else
                                          {
                                              QTextStream text(&file);
                                              text.setCodec("UTF-8");
                                              QString fileContents = text.readAll();
                                              ui->TextEdit->setPlainText(fileContents);
                                              file.close();
                                  
                                              edited = false;
                                              url = URL;
                                              changeTitle();
                                          }
                                      }
                                  }
                                  

                                  when i double click the text file i got error(QMessageBox::information(this, "can't open file", "can't open the specified file");)

                                  JonBJ Offline
                                  JonBJ Offline
                                  JonB
                                  wrote on last edited by
                                  #20

                                  @_-mohamed-_
                                  So why not debug out URL and the file path from QFile file for yourself? Do you mean that filename really has ???? in it??

                                  _ 1 Reply Last reply
                                  0
                                  • JonBJ JonB

                                    @_-mohamed-_
                                    So why not debug out URL and the file path from QFile file for yourself? Do you mean that filename really has ???? in it??

                                    _ Offline
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                                    _-mohamed-_
                                    wrote on last edited by
                                    #21

                                    @JonB no the real file name is "عربي.txt" but i can't get the real name from app's argument

                                    JonBJ 1 Reply Last reply
                                    0
                                    • _ _-mohamed-_

                                      @JonB no the real file name is "عربي.txt" but i can't get the real name from app's argument

                                      JonBJ Offline
                                      JonBJ Offline
                                      JonB
                                      wrote on last edited by JonB
                                      #22

                                      @_-mohamed-_
                                      Look at file.errorString() when the file.open() fails. And print out URL and file.fileName().

                                      _ 1 Reply Last reply
                                      0
                                      • JonBJ JonB

                                        @_-mohamed-_
                                        Look at file.errorString() when the file.open() fails. And print out URL and file.fileName().

                                        _ Offline
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                                        _-mohamed-_
                                        wrote on last edited by
                                        #23

                                        @JonB i printed the URL and i got (C:\Users\moham\OneDrive\Desktop????.txt) as i said in the previous post
                                        So file.open () can't open a strange text (????.txt)

                                        Christian EhrlicherC 1 Reply Last reply
                                        0
                                        • _ _-mohamed-_

                                          @JonB i printed the URL and i got (C:\Users\moham\OneDrive\Desktop????.txt) as i said in the previous post
                                          So file.open () can't open a strange text (????.txt)

                                          Christian EhrlicherC Online
                                          Christian EhrlicherC Online
                                          Christian Ehrlicher
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #24

                                          @_-mohamed-_ said in how to open a file in my qt app via double clicking on it:

                                          i printed the URL and i got (C:\Users\moham\OneDrive\Desktop????.txt) as i said in the previous post

                                          You must not print non-ascii characters on a windows console - windows is too stupid for this. You QMessageBox or similar.

                                          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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