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problem with System()

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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.

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        mrjj
        Lifetime Qt Champion
        wrote on 24 Jun 2016, 08:49 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.

        A 1 Reply Last reply 24 Jun 2016, 08:54
        0
        • M mrjj
          24 Jun 2016, 08:49

          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.

          A Offline
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          AlvaroS
          wrote on 24 Jun 2016, 08:54 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" << "+" ;
          
          
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            mrjj
            Lifetime Qt Champion
            wrote on 24 Jun 2016, 09:11 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 ?

            A 2 Replies Last reply 24 Jun 2016, 09:22
            0
            • M mrjj
              24 Jun 2016, 09:11

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

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              AlvaroS
              wrote on 24 Jun 2016, 09:22 last edited by
              #33

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

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              • M mrjj
                24 Jun 2016, 09:11

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

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                AlvaroS
                wrote on 24 Jun 2016, 09:31 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...

                M 1 Reply Last reply 24 Jun 2016, 09:43
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                  SGaist
                  Lifetime Qt Champion
                  wrote on 24 Jun 2016, 09:32 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

                  A 1 Reply Last reply 24 Jun 2016, 09:32
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                  • S SGaist
                    24 Jun 2016, 09:32

                    What is that + sign doing as parameter ?

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                    AlvaroS
                    wrote on 24 Jun 2016, 09:32 last edited by
                    #36

                    @SGaist + is just and argument that i have to pass to princi

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                    • A AlvaroS
                      24 Jun 2016, 09:31

                      @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...

                      M Offline
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                      mrjj
                      Lifetime Qt Champion
                      wrote on 24 Jun 2016, 09:43 last edited by
                      #37

                      @AlvaroS
                      well you must debug it then.
                      Try to qDebug inside princi what you read and compare that to what u read for
                      system ("./princi 0 5 10 0 7 8 prueba_princi.bmp 0 0 +")

                      Sadly We cannot guess why you crash from the code shown.

                      Also you dump the arguments to qDebug before u
                      call start, just to see what u are sending also.

                      and then take it from there.

                      1 Reply Last reply
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                      24 Jun 2016, 09:43

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