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problem with System()

Scheduled Pinned Locked Moved Unsolved General and Desktop
system commandsystem
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  • mrjjM mrjj

    @AlvaroS said:

    sprintf(command, "%s %0.0f %0.0f 0 %0.0f %0.0f %s 0 0 +", princi,wps.front().x(), wps.front().y(),wps.back().x(),wps.back().y(),name_bmp)

    What types are
    princi
    name_bmp

    better not be QStrings :)

    AlvaroSA Offline
    AlvaroSA Offline
    AlvaroS
    wrote on last edited by
    #6

    @mrjj Hello.
    They are const char* !

    1 Reply Last reply
    1
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #7

      Then run your application through the debugger.

      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

        Then run your application through the debugger.

        AlvaroSA Offline
        AlvaroSA Offline
        AlvaroS
        wrote on last edited by
        #8

        @SGaist Now I do this:

            QString program = "./home/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 +" ;
        
            QProcess myProcess;
        
            myProcess.start(program,arguments);
        

        it compiles good but my application does not run...

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #9

          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 ?

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

          AlvaroSA 2 Replies Last reply
          2
          • 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
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