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problem with System()

Scheduled Pinned Locked Moved Unsolved General and Desktop
system commandsystem
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  • 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 Online
        jsulmJ Online
        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 Online
              jsulmJ Online
              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
                              • mrjjM Offline
                                mrjjM Offline
                                mrjj
                                Lifetime Qt Champion
                                wrote on last edited by mrjj
                                #30

                                so it sounds like your princi do run but it crashes?

                                oh. sorry my bad. start is async so calling error right after was
                                not correct.

                                waitForFinished fixed that.

                                AlvaroSA 1 Reply Last reply
                                0
                                • mrjjM mrjj

                                  so it sounds like your princi do run but it crashes?

                                  oh. sorry my bad. start is async so calling error right after was
                                  not correct.

                                  waitForFinished fixed that.

                                  AlvaroSA Offline
                                  AlvaroSA Offline
                                  AlvaroS
                                  wrote on last edited by
                                  #31

                                  @mrjj Yes... I think so...
                                  How should I pass the arguments?

                                  the arguments of princi are:

                                  0 wps.front().x() wps.front().y() 0 wps.back().x() wps.front().y() prueba_princi.bmp 0 0 +
                                  

                                  so my QStringList arguments is:

                                   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" << "+" ;
                                  
                                  
                                  1 Reply Last reply
                                  0
                                  • mrjjM Offline
                                    mrjjM Offline
                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #32

                                    it seems fine
                                    You should look inside princi for how it
                                    reads it. it must be that part that is crashing ?

                                    AlvaroSA 2 Replies Last reply
                                    0
                                    • mrjjM mrjj

                                      it seems fine
                                      You should look inside princi for how it
                                      reads it. it must be that part that is crashing ?

                                      AlvaroSA Offline
                                      AlvaroSA Offline
                                      AlvaroS
                                      wrote on last edited by
                                      #33

                                      @mrjj yes, but it really rare that if I run from terminal princi runs good...

                                      1 Reply Last reply
                                      0
                                      • mrjjM mrjj

                                        it seems fine
                                        You should look inside princi for how it
                                        reads it. it must be that part that is crashing ?

                                        AlvaroSA Offline
                                        AlvaroSA Offline
                                        AlvaroS
                                        wrote on last edited by AlvaroS
                                        #34

                                        @mrjj And if I write:

                                        system ("./princi 0 5 10 0 7 8 prueba_princi.bmp 0 0 +")
                                        where 5,10,7 and 8 are wps.front,wps.back....
                                        it runs well...

                                        mrjjM 1 Reply Last reply
                                        0
                                        • SGaistS Offline
                                          SGaistS Offline
                                          SGaist
                                          Lifetime Qt Champion
                                          wrote on last edited by
                                          #35

                                          What is that + sign doing as parameter ?

                                          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
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