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problem with System()

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system commandsystem
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  • S SGaist
    24 Jun 2016, 07:50

    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 ?

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    AlvaroS
    wrote on 24 Jun 2016, 07:56 last edited by
    #10

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

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    • S SGaist
      24 Jun 2016, 07:50

      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 ?

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      AlvaroS
      wrote on 24 Jun 2016, 07:58 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);
      
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      • S Offline
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        SGaist
        Lifetime Qt Champion
        wrote on 24 Jun 2016, 07:59 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

        A 1 Reply Last reply 24 Jun 2016, 08:01
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        • S SGaist
          24 Jun 2016, 07:59

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

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          AlvaroS
          wrote on 24 Jun 2016, 08:01 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

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            jsulm
            Lifetime Qt Champion
            wrote on 24 Jun 2016, 08:09 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

            A 1 Reply Last reply 24 Jun 2016, 08:23
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            • J jsulm
              24 Jun 2016, 08:09

              /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.

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              AlvaroS
              wrote on 24 Jun 2016, 08:23 last edited by
              #15

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

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                mrjj
                Lifetime Qt Champion
                wrote on 24 Jun 2016, 08:25 last edited by
                #16

                @AlvaroS said:

                QString program = "princi";

                should be

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

                ?

                A 1 Reply Last reply 24 Jun 2016, 08:28
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                • M mrjj
                  24 Jun 2016, 08:25

                  @AlvaroS said:

                  QString program = "princi";

                  should be

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

                  ?

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                  AlvaroS
                  wrote on 24 Jun 2016, 08:28 last edited by
                  #17

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

                  J M 2 Replies Last reply 24 Jun 2016, 08:29
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                  • A AlvaroS
                    24 Jun 2016, 08:28

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

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                    jsulm
                    Lifetime Qt Champion
                    wrote on 24 Jun 2016, 08:29 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

                    A 1 Reply Last reply 24 Jun 2016, 08:31
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                    • A AlvaroS
                      24 Jun 2016, 08:28

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

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                      mrjj
                      Lifetime Qt Champion
                      wrote on 24 Jun 2016, 08:30 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.

                      A 1 Reply Last reply 24 Jun 2016, 08:38
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                      • J jsulm
                        24 Jun 2016, 08:29

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

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                        AlvaroS
                        wrote on 24 Jun 2016, 08:31 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

                        J A 2 Replies Last reply 24 Jun 2016, 08:33
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                        • A AlvaroS
                          24 Jun 2016, 08:31

                          @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

                          J Offline
                          J Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on 24 Jun 2016, 08:33 last edited by jsulm
                          #21

                          @AlvaroS Then try what @mrjj suggested

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

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                          • M mrjj
                            24 Jun 2016, 08:30

                            @AlvaroS

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

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                            AlvaroS
                            wrote on 24 Jun 2016, 08:38 last edited by
                            #22
                            This post is deleted!
                            M 1 Reply Last reply 24 Jun 2016, 08:40
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                            • A AlvaroS
                              24 Jun 2016, 08:31

                              @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

                              A Offline
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                              AlvaroS
                              wrote on 24 Jun 2016, 08:39 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

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                              • A AlvaroS
                                24 Jun 2016, 08:38

                                This post is deleted!

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                                mrjj
                                Lifetime Qt Champion
                                wrote on 24 Jun 2016, 08:40 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

                                A 1 Reply Last reply 24 Jun 2016, 08:42
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                                • M mrjj
                                  24 Jun 2016, 08:40

                                  @AlvaroS

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

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

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                                  AlvaroS
                                  wrote on 24 Jun 2016, 08:42 last edited by
                                  #25

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

                                  M 1 Reply Last reply 24 Jun 2016, 08:43
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                                  • A AlvaroS
                                    24 Jun 2016, 08:42

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

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                                    mrjj
                                    Lifetime Qt Champion
                                    wrote on 24 Jun 2016, 08:43 last edited by
                                    #26

                                    @AlvaroS

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

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

                                    A 1 Reply Last reply 24 Jun 2016, 08:44
                                    1
                                    • M mrjj
                                      24 Jun 2016, 08:43

                                      @AlvaroS

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

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

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                                      AlvaroS
                                      wrote on 24 Jun 2016, 08:44 last edited by
                                      #27

                                      @mrjj Yes:

                                          myProcess->start(program, arguments);
                                      
                                          QProcess::ProcessError error = myProcess->error();
                                      
                                      M 1 Reply Last reply 24 Jun 2016, 08:46
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                                      • A AlvaroS
                                        24 Jun 2016, 08:44

                                        @mrjj Yes:

                                            myProcess->start(program, arguments);
                                        
                                            QProcess::ProcessError error = myProcess->error();
                                        
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                                        mrjj
                                        Lifetime Qt Champion
                                        wrote on 24 Jun 2016, 08:46 last edited by
                                        #28

                                        @AlvaroS
                                        hmm really odd then
                                        it should say FailedToStart

                                        Just to be 100% clear.

                                        princi is never run ?

                                        A 1 Reply Last reply 24 Jun 2016, 08:48
                                        1
                                        • M mrjj
                                          24 Jun 2016, 08:46

                                          @AlvaroS
                                          hmm really odd then
                                          it should say FailedToStart

                                          Just to be 100% clear.

                                          princi is never run ?

                                          A Offline
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                                          AlvaroS
                                          wrote on 24 Jun 2016, 08:48 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
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