Skip to content
  • Categories
  • Recent
  • Tags
  • Popular
  • Users
  • Groups
  • Search
  • Get Qt Extensions
  • Unsolved
Collapse
Brand Logo
  1. Home
  2. Qt Development
  3. General and Desktop
  4. problem with System()
Forum Updated to NodeBB v4.3 + New Features

problem with System()

Scheduled Pinned Locked Moved Unsolved General and Desktop
system commandsystem
37 Posts 5 Posters 13.0k Views 2 Watching
  • Oldest to Newest
  • Newest to Oldest
  • Most Votes
Reply
  • Reply as topic
Log in to reply
This topic has been deleted. Only users with topic management privileges can see it.
  • SGaistS SGaist

    You call it with a path relative to where you main application is started.

    ./home/princi is equivalent to $PWD/home/princi/ which is likely not what you want, is it ?

    AlvaroSA Offline
    AlvaroSA Offline
    AlvaroS
    wrote on last edited by
    #10

    @SGaist yes! but it does not run with that code..

    1 Reply Last reply
    0
    • SGaistS SGaist

      You call it with a path relative to where you main application is started.

      ./home/princi is equivalent to $PWD/home/princi/ which is likely not what you want, is it ?

      AlvaroSA Offline
      AlvaroSA Offline
      AlvaroS
      wrote on last edited by
      #11

      @SGaist Now I do this and nothing as well..

          QString program = "princi";
          QStringList arguments;
      
          arguments << "0" << QString::number(wps.front().x()) << QString::number(wps.front().y()) << "0" << QString::number(wps.back().x()) << QString::number(wps.back().y()) << "prueba_princi.bmp" << "0 0 +" ;
      
          QString folder = "/home/";
      
          QProcess *myProcess = new QProcess(this);
      
          myProcess->setWorkingDirectory(folder);
      
          myProcess->start(program,arguments);
      
      1 Reply Last reply
      0
      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #12

        What is the full path to princi ? And what is the full path to 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

        AlvaroSA 1 Reply Last reply
        0
        • SGaistS SGaist

          What is the full path to princi ? And what is the full path to your application ?

          AlvaroSA Offline
          AlvaroSA Offline
          AlvaroS
          wrote on last edited by
          #13

          @SGaist Full path of princi (which is the executable) is /home/
          and full path of my QT aplication is /home/workspace

          1 Reply Last reply
          0
          • jsulmJ Offline
            jsulmJ Offline
            jsulm
            Lifetime Qt Champion
            wrote on last edited by
            #14

            /home is not the full path to your application except it is called home and is located in the root directory.
            So, you can start the program in a shell with /home/princi?
            Did you try it?
            This is quite strange path: in /home you usually have a directory for each user and /home is not writable by normal user.

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

            AlvaroSA 1 Reply Last reply
            2
            • jsulmJ jsulm

              /home is not the full path to your application except it is called home and is located in the root directory.
              So, you can start the program in a shell with /home/princi?
              Did you try it?
              This is quite strange path: in /home you usually have a directory for each user and /home is not writable by normal user.

              AlvaroSA Offline
              AlvaroSA Offline
              AlvaroS
              wrote on last edited by
              #15

              @jsulm sorry yes, it is in /home/user1/ but it does not run as well...

              1 Reply Last reply
              0
              • mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #16

                @AlvaroS said:

                QString program = "princi";

                should be

                QString program = "/home/user1/princi";

                ?

                AlvaroSA 1 Reply Last reply
                1
                • mrjjM mrjj

                  @AlvaroS said:

                  QString program = "princi";

                  should be

                  QString program = "/home/user1/princi";

                  ?

                  AlvaroSA Offline
                  AlvaroSA Offline
                  AlvaroS
                  wrote on last edited by
                  #17

                  @mrjj It works in the same way... :(

                  jsulmJ mrjjM 2 Replies Last reply
                  0
                  • AlvaroSA AlvaroS

                    @mrjj It works in the same way... :(

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #18

                    @AlvaroS So, if you enter /home/user1/princi in a terminal window and press enter it does not start? What happens? Any error message?

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

                    AlvaroSA 1 Reply Last reply
                    1
                    • AlvaroSA AlvaroS

                      @mrjj It works in the same way... :(

                      mrjjM Offline
                      mrjjM Offline
                      mrjj
                      Lifetime Qt Champion
                      wrote on last edited by
                      #19

                      @AlvaroS

                      Ok, you must debug then
                      try to use
                      http://doc.qt.io/qt-5/qprocess.html#error
                      to see what it thinks.

                      AlvaroSA 1 Reply Last reply
                      2
                      • jsulmJ jsulm

                        @AlvaroS So, if you enter /home/user1/princi in a terminal window and press enter it does not start? What happens? Any error message?

                        AlvaroSA Offline
                        AlvaroSA Offline
                        AlvaroS
                        wrote on last edited by
                        #20

                        @jsulm In a terminal if I write

                        ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
                        

                        in /home/user1/ directory it runs good

                        jsulmJ AlvaroSA 2 Replies Last reply
                        0
                        • AlvaroSA AlvaroS

                          @jsulm In a terminal if I write

                          ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
                          

                          in /home/user1/ directory it runs good

                          jsulmJ Offline
                          jsulmJ Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on last edited by jsulm
                          #21

                          @AlvaroS Then try what @mrjj suggested

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

                          1 Reply Last reply
                          0
                          • mrjjM mrjj

                            @AlvaroS

                            Ok, you must debug then
                            try to use
                            http://doc.qt.io/qt-5/qprocess.html#error
                            to see what it thinks.

                            AlvaroSA Offline
                            AlvaroSA Offline
                            AlvaroS
                            wrote on last edited by
                            #22
                            This post is deleted!
                            mrjjM 1 Reply Last reply
                            0
                            • AlvaroSA AlvaroS

                              @jsulm In a terminal if I write

                              ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
                              

                              in /home/user1/ directory it runs good

                              AlvaroSA Offline
                              AlvaroSA Offline
                              AlvaroS
                              wrote on last edited by AlvaroS
                              #23

                              @AlvaroS said:

                              @jsulm In a terminal if I write

                              ./princi 0 747.37 427.68 0 844.37 42.54 prueba_princi.bmp 0 0 +
                              

                              in /home/user1/ directory it runs good

                              @jsulm said:

                              @AlvaroS Then try what @mrjj suggested

                              okey, it gives me UnknowError.... http://doc.qt.io/qt-5/qprocess.html#ProcessError-enum

                              1 Reply Last reply
                              0
                              • AlvaroSA AlvaroS

                                This post is deleted!

                                mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by
                                #24

                                @AlvaroS

                                well you can use
                                qDebug() "qproc: " << myProcess->error();

                                and check the code in
                                http://doc.qt.io/qt-5/qprocess.html#ProcessError-enum

                                AlvaroSA 1 Reply Last reply
                                1
                                • mrjjM mrjj

                                  @AlvaroS

                                  well you can use
                                  qDebug() "qproc: " << myProcess->error();

                                  and check the code in
                                  http://doc.qt.io/qt-5/qprocess.html#ProcessError-enum

                                  AlvaroSA Offline
                                  AlvaroSA Offline
                                  AlvaroS
                                  wrote on last edited by
                                  #25

                                  @mrjj Yes thanks!! See my last post. Thanks again. It gives me Unknow error...

                                  mrjjM 1 Reply Last reply
                                  0
                                  • AlvaroSA AlvaroS

                                    @mrjj Yes thanks!! See my last post. Thanks again. It gives me Unknow error...

                                    mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #26

                                    @AlvaroS

                                    " This is the default return value of error()."

                                    You do call it AFTER u call
                                    myProcess->start(program,arguments); ?

                                    AlvaroSA 1 Reply Last reply
                                    1
                                    • mrjjM mrjj

                                      @AlvaroS

                                      " This is the default return value of error()."

                                      You do call it AFTER u call
                                      myProcess->start(program,arguments); ?

                                      AlvaroSA Offline
                                      AlvaroSA Offline
                                      AlvaroS
                                      wrote on last edited by
                                      #27

                                      @mrjj Yes:

                                          myProcess->start(program, arguments);
                                      
                                          QProcess::ProcessError error = myProcess->error();
                                      
                                      mrjjM 1 Reply Last reply
                                      0
                                      • AlvaroSA AlvaroS

                                        @mrjj Yes:

                                            myProcess->start(program, arguments);
                                        
                                            QProcess::ProcessError error = myProcess->error();
                                        
                                        mrjjM Offline
                                        mrjjM Offline
                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #28

                                        @AlvaroS
                                        hmm really odd then
                                        it should say FailedToStart

                                        Just to be 100% clear.

                                        princi is never run ?

                                        AlvaroSA 1 Reply Last reply
                                        1
                                        • mrjjM mrjj

                                          @AlvaroS
                                          hmm really odd then
                                          it should say FailedToStart

                                          Just to be 100% clear.

                                          princi is never run ?

                                          AlvaroSA Offline
                                          AlvaroSA Offline
                                          AlvaroS
                                          wrote on last edited by
                                          #29

                                          @mrjj said:

                                          @AlvaroS
                                          hmm really odd then
                                          it should say FailedToStart

                                          Just to be 100% clear.

                                          princi is never run ?

                                          okey look.
                                          if I write:

                                              myProcess->start(program, arguments);
                                          
                                              myProcess->waitForFinished(3000);
                                          
                                              QProcess::ProcessError error = myProcess->error();
                                          
                                          

                                          Now error says:
                                          QProcess::Crashed The process crashed some time after starting successfully.

                                          1 Reply Last reply
                                          0

                                          • Login

                                          • Login or register to search.
                                          • First post
                                            Last post
                                          0
                                          • Categories
                                          • Recent
                                          • Tags
                                          • Popular
                                          • Users
                                          • Groups
                                          • Search
                                          • Get Qt Extensions
                                          • Unsolved