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Qprocess exiting with exit code 255 when trying to run python script

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  • jsulmJ jsulm

    @Adithya What does https://doc.qt.io/qt-6/qprocess.html#error return? On what platform are you? Is Python executable in PATH?

    AdithyaA Offline
    AdithyaA Offline
    Adithya
    wrote on last edited by
    #3

    @jsulm Hi , the start() exit code is 255 and I am not using execute() . I am trying this in ubuntu 22 qt c++ .Python interpreter is in the path /usr/bin/python3.exe

    echo $PATH
    /opt/ros/noetic/bin:/home/adithya/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

    So ideally python should take from PATH

    jsulmJ JonBJ 2 Replies Last reply
    0
    • jsulmJ jsulm

      @Adithya What does https://doc.qt.io/qt-6/qprocess.html#error return? On what platform are you? Is Python executable in PATH?

      AdithyaA Offline
      AdithyaA Offline
      Adithya
      wrote on last edited by
      #4

      @jsulm I tried using QProcess::execute() aswell it is giving return value as -2

      1 Reply Last reply
      0
      • AdithyaA Adithya

        @jsulm Hi , the start() exit code is 255 and I am not using execute() . I am trying this in ubuntu 22 qt c++ .Python interpreter is in the path /usr/bin/python3.exe

        echo $PATH
        /opt/ros/noetic/bin:/home/adithya/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

        So ideally python should take from PATH

        jsulmJ Offline
        jsulmJ Offline
        jsulm
        Lifetime Qt Champion
        wrote on last edited by
        #5

        @Adithya said in Qprocess exiting with exit code 255 when trying to run python script:

        Can you please answer my first question?

        "Python interpreter is in the path /usr/bin/python3.exe" - in your code you're using "python" not python3 - is there a "python" executable?

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

        AdithyaA 1 Reply Last reply
        0
        • AdithyaA Adithya

          I am trying to create a Qprocess to run a python script and it is throwing error with exit code 255 .
          Code :

          int main(int argc, char *argv[])
          {
          QApplication a(argc, argv);

              // Path to the directory containing your Python script and other files
              QString workingDirectory = QDir::currentPath() + "/Tools/script";
              qDebug() << "Path = " <<workingDirectory;
          
              // Path to the Python script you want to execute
              QString pythonScript = QDir::currentPath() + "/Tools/script/main.py";
          
              // Arguments to pass to the Python script
              QStringList arguments;
              arguments << pythonScript << "1" << "2";
          
              // Create a QProcess instance
              QProcess process;
          
              // Set the working directory
              process.setWorkingDirectory(workingDirectory);
          
              // Set the command to execute
              process.start("python", arguments);
          
              if (!process.waitForStarted()) {
                   qDebug() << "Failed to start Python process";
                   //return 1;
               }
          
              // Wait for the process to finish (optional)
              process.waitForFinished();
          
              // Get the exit code of the process
              int exitCode = process.exitCode();
          
              // Handle the exit code if needed
              if (exitCode != 0) {
                  qDebug() << "Python script execution failed with exit code:" << exitCode;
                  //return 1;
              }
              return a.exec();
          
          }
          

          main.py

          if name == 'main':
          print("Hey there")

          error:
          Failed to start Python process
          Python script execution failed with exit code: 255

          Thanks for the help in advance

          J.HilkJ Offline
          J.HilkJ Offline
          J.Hilk
          Moderators
          wrote on last edited by
          #6

          @Adithya

          Exit code 255 generally indicates that the program couldn't start. This can happen due to various reasons.

          in this case, I think its a typical case of a wrong path.

          currentPath() should be the location of your generated executable, not your source files.
          Check that QDir::currentPath() + "/Tools/script/main.py" is actually a valid file and the correct file.


          Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


          Q: What's that?
          A: It's blue light.
          Q: What does it do?
          A: It turns blue.

          AdithyaA 1 Reply Last reply
          1
          • jsulmJ jsulm

            @Adithya said in Qprocess exiting with exit code 255 when trying to run python script:

            Can you please answer my first question?

            "Python interpreter is in the path /usr/bin/python3.exe" - in your code you're using "python" not python3 - is there a "python" executable?

            AdithyaA Offline
            AdithyaA Offline
            Adithya
            wrote on last edited by
            #7

            @jsulm I dont have python.exe , but I have python3.exe .I changed process.start("python", arguments); to process.start("python3", arguments); aswell .I was not getting the log from py file but there was no 255 exit code . But -2 when I used QProcess::execute().

            jsulmJ 1 Reply Last reply
            0
            • J.HilkJ J.Hilk

              @Adithya

              Exit code 255 generally indicates that the program couldn't start. This can happen due to various reasons.

              in this case, I think its a typical case of a wrong path.

              currentPath() should be the location of your generated executable, not your source files.
              Check that QDir::currentPath() + "/Tools/script/main.py" is actually a valid file and the correct file.

              AdithyaA Offline
              AdithyaA Offline
              Adithya
              wrote on last edited by
              #8

              Hi @J-Hilk , This is not the issue path. the py file preset in the specified path

              J.HilkJ 1 Reply Last reply
              0
              • AdithyaA Adithya

                @jsulm I dont have python.exe , but I have python3.exe .I changed process.start("python", arguments); to process.start("python3", arguments); aswell .I was not getting the log from py file but there was no 255 exit code . But -2 when I used QProcess::execute().

                jsulmJ Offline
                jsulmJ Offline
                jsulm
                Lifetime Qt Champion
                wrote on last edited by
                #9

                @Adithya I will ask for the third time (I will stop here if you do not answer): What does https://doc.qt.io/qt-6/qprocess.html#error return?

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

                AdithyaA 1 Reply Last reply
                0
                • jsulmJ jsulm

                  @Adithya I will ask for the third time (I will stop here if you do not answer): What does https://doc.qt.io/qt-6/qprocess.html#error return?

                  AdithyaA Offline
                  AdithyaA Offline
                  Adithya
                  wrote on last edited by
                  #10

                  @jsulm I am getting QProcess::error as "ERROR: QProcess::UnknownError"

                  jsulmJ 1 Reply Last reply
                  0
                  • AdithyaA Adithya

                    @jsulm I am getting QProcess::error as "ERROR: QProcess::UnknownError"

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #11

                    @Adithya Then maybe your Python script exits with -2?
                    You can also connect a slot to https://doc.qt.io/qt-6/qprocess.html#stateChanged and log state changes.
                    And you can also connect slots to https://doc.qt.io/qt-6/qprocess.html#readyReadStandardError and https://doc.qt.io/qt-6/qprocess.html#readyReadStandardOutput and print out stderr/stdout from your process there.

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

                    AdithyaA 1 Reply Last reply
                    1
                    • AdithyaA Adithya

                      Hi @J-Hilk , This is not the issue path. the py file preset in the specified path

                      J.HilkJ Offline
                      J.HilkJ Offline
                      J.Hilk
                      Moderators
                      wrote on last edited by
                      #12

                      @Adithya did you really check, or did you just type this answer ?

                      If I had a € for every time I heard "ThE PaTh Is CoRrEcT!!111eleven" and it turns out it's not, because currentPath() or applicationDirPath() etc. did not actually point to the assumed directory, I would have a surprising amount of money :D.

                      qDebug() << (QDir::currentPath() + "/Tools/script/main.py");
                      

                      Be aware of the Qt Code of Conduct, when posting : https://forum.qt.io/topic/113070/qt-code-of-conduct


                      Q: What's that?
                      A: It's blue light.
                      Q: What does it do?
                      A: It turns blue.

                      AdithyaA 1 Reply Last reply
                      0
                      • J.HilkJ J.Hilk

                        @Adithya did you really check, or did you just type this answer ?

                        If I had a € for every time I heard "ThE PaTh Is CoRrEcT!!111eleven" and it turns out it's not, because currentPath() or applicationDirPath() etc. did not actually point to the assumed directory, I would have a surprising amount of money :D.

                        qDebug() << (QDir::currentPath() + "/Tools/script/main.py");
                        
                        AdithyaA Offline
                        AdithyaA Offline
                        Adithya
                        wrote on last edited by
                        #13

                        @J-Hilk // Path to the Python script you want to execute
                        QString pythonScript = QDir::currentPath() + "/Tools/Extractor_OD/main_od_for_rci.py";
                        qDebug() << "Script Path = " <<pythonScript;

                        Log : Script Path = "/home/adithya/DVT/DVT-3.0/DistanceVerificationTool/Tools/Extractor_OD/main_od_for_rci.py"

                        adithya@adithya:~/DVT/DVT-3.0/DistanceVerificationTool/Tools/Extractor_OD$ pwd
                        /home/adithya/DVT/DVT-3.0/DistanceVerificationTool/Tools/Extractor_OD
                        adithya@adithya:~/DVT/DVT-3.0/DistanceVerificationTool/Tools/Extractor_OD$ ls
                        copy_script RCI_Front_LUT.h RCI_Rear_LUT.h src
                        main_od_for_rci.py RCI_Left_LUT.h RCI_Right_LUT.h

                        I reallt checked multiple time .The oath is not the issue . You are not gettiing the € this time :p

                        1 Reply Last reply
                        0
                        • jsulmJ jsulm

                          @Adithya Then maybe your Python script exits with -2?
                          You can also connect a slot to https://doc.qt.io/qt-6/qprocess.html#stateChanged and log state changes.
                          And you can also connect slots to https://doc.qt.io/qt-6/qprocess.html#readyReadStandardError and https://doc.qt.io/qt-6/qprocess.html#readyReadStandardOutput and print out stderr/stdout from your process there.

                          AdithyaA Offline
                          AdithyaA Offline
                          Adithya
                          wrote on last edited by Adithya
                          #14

                          @jsulm I tried using stateChanged something like this
                          QObject::connect(&process, &QProcess::stateChanged, [](QProcess::ProcessState newState) {
                          qDebug() << "Process = "<< newState;
                          });
                          Log :Process = QProcess::Starting
                          ERROR: QProcess::UnknownError
                          Process = QProcess::NotRunning
                          Failed to start Python process
                          Python script execution failed with exit code: 255

                          jsulmJ 1 Reply Last reply
                          0
                          • AdithyaA Adithya

                            @jsulm I tried using stateChanged something like this
                            QObject::connect(&process, &QProcess::stateChanged, [](QProcess::ProcessState newState) {
                            qDebug() << "Process = "<< newState;
                            });
                            Log :Process = QProcess::Starting
                            ERROR: QProcess::UnknownError
                            Process = QProcess::NotRunning
                            Failed to start Python process
                            Python script execution failed with exit code: 255

                            jsulmJ Offline
                            jsulmJ Offline
                            jsulm
                            Lifetime Qt Champion
                            wrote on last edited by
                            #15

                            @Adithya Please share your current code, so we can see what exactly you're trying now.
                            Also try with an absolute path to the Python executable to make sure that is not the issue.

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

                            AdithyaA 1 Reply Last reply
                            0
                            • AdithyaA Adithya

                              @jsulm Hi , the start() exit code is 255 and I am not using execute() . I am trying this in ubuntu 22 qt c++ .Python interpreter is in the path /usr/bin/python3.exe

                              echo $PATH
                              /opt/ros/noetic/bin:/home/adithya/.local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin

                              So ideally python should take from PATH

                              JonBJ Offline
                              JonBJ Offline
                              JonB
                              wrote on last edited by JonB
                              #16

                              @Adithya said in Qprocess exiting with exit code 255 when trying to run python script:

                              I am trying this in ubuntu 22 qt c++ .Python interpreter is in the path /usr/bin/python3.exe

                              You are under Ubuntu/Linux and the executable you want to run ends in .exe, right? Even though that is for Windows? So you can type /usr/bin/python3.exe in a terminal and that executes fine, right?

                              That aside. Since the Ubuntu executable is indeed python3 why are you trying to start a process named python?

                              #include <QCoreApplication>
                              #include <QDebug>
                              #include <QProcess>
                              
                              int main(int argc, char *argv[])
                              {
                                  QCoreApplication a(argc, argv);
                              
                                  QProcess process;
                                  process.start("python", QStringList());
                                  QObject::connect(&process, &QProcess::errorOccurred, &process, [&process]() { qDebug() << process.errorString();  } );
                                  if (!process.waitForStarted()) {
                                       qDebug() << "Failed to start Python process";
                                       return 1;
                                   }
                                  process.waitForFinished();
                                  int exitCode = process.exitCode();
                                  if (exitCode != 0) {
                                      qDebug() << "Python script execution failed with exit code:" << exitCode;
                                      return 1;
                                  }
                              
                                  return a.exec();
                              }
                              

                              shows me

                              "execvp: No such file or directory"
                              Failed to start Python process
                              

                              So execvp() on python complains No such file or directory under Ubuntu 22.04, as I would expect.

                              Changing to process.start("python3", ...); produces no such error and runs the python3 interpreter....

                              1 Reply Last reply
                              3
                              • jsulmJ jsulm

                                @Adithya Please share your current code, so we can see what exactly you're trying now.
                                Also try with an absolute path to the Python executable to make sure that is not the issue.

                                AdithyaA Offline
                                AdithyaA Offline
                                Adithya
                                wrote on last edited by
                                #17

                                @jsulm
                                //trying it in main funtion itself for now , have commented everything else.
                                main.cpp
                                int main(int argc, char *argv[])
                                {
                                QApplication a(argc, argv);

                                // Path to the Python interpreter
                                QString pythonInterpreter = "/usr/bin/python3.exe"; // or the full path to python.exe
                                
                                // Path to the directory containing your Python script and other files
                                QString workingDirectory = QDir::currentPath() + "/Tools/Extractor_OD";
                                qDebug() << "Path = " <<workingDirectory;
                                
                                // Path to the Python script you want to execute
                                QString pythonScript = QDir::currentPath() + "/Tools/Extractor_OD/main_od_for_rci.py";
                                qDebug() << "Script Path = " <<pythonScript;
                                
                                // Arguments to pass to the Python script
                                QStringList arguments;
                                arguments << pythonScript << "1" << "2";
                                
                                QString command = pythonScript + " 1 2";
                                
                                // Create a QProcess instance
                                QProcess process;
                                
                                QObject::connect(&process, &QProcess::stateChanged, [](QProcess::ProcessState newState) {
                                           qDebug() << "Process = "<< newState;
                                   });
                                
                                // Set the working directory
                                //process.setWorkingDirectory(workingDirectory);
                                
                                // Set the command to execute
                                process.start(pythonInterpreter, arguments);
                                
                                QProcess::ProcessError error = process.error();
                                qDebug() << "ERROR: " << error;
                                
                                if (!process.waitForStarted()) {
                                     qDebug() << "Failed to start Python process";
                                     //return 1;
                                 }
                                
                                // Wait for the process to finish (optional)
                                process.waitForFinished();
                                
                                // Get the exit code of the process
                                int exitCode = process.exitCode();
                                
                                // Handle the exit code if needed
                                if (exitCode != 0) {
                                    qDebug() << "Python script execution failed with exit code:" << exitCode;
                                    //return 1;
                                }
                                return a.exec();
                                

                                }

                                //Have commented out everything just trying to log for now
                                main_od_for_rci.py
                                if name == 'main':
                                print("Hey there")

                                jsulmJ JonBJ 2 Replies Last reply
                                0
                                • AdithyaA Adithya

                                  @jsulm
                                  //trying it in main funtion itself for now , have commented everything else.
                                  main.cpp
                                  int main(int argc, char *argv[])
                                  {
                                  QApplication a(argc, argv);

                                  // Path to the Python interpreter
                                  QString pythonInterpreter = "/usr/bin/python3.exe"; // or the full path to python.exe
                                  
                                  // Path to the directory containing your Python script and other files
                                  QString workingDirectory = QDir::currentPath() + "/Tools/Extractor_OD";
                                  qDebug() << "Path = " <<workingDirectory;
                                  
                                  // Path to the Python script you want to execute
                                  QString pythonScript = QDir::currentPath() + "/Tools/Extractor_OD/main_od_for_rci.py";
                                  qDebug() << "Script Path = " <<pythonScript;
                                  
                                  // Arguments to pass to the Python script
                                  QStringList arguments;
                                  arguments << pythonScript << "1" << "2";
                                  
                                  QString command = pythonScript + " 1 2";
                                  
                                  // Create a QProcess instance
                                  QProcess process;
                                  
                                  QObject::connect(&process, &QProcess::stateChanged, [](QProcess::ProcessState newState) {
                                             qDebug() << "Process = "<< newState;
                                     });
                                  
                                  // Set the working directory
                                  //process.setWorkingDirectory(workingDirectory);
                                  
                                  // Set the command to execute
                                  process.start(pythonInterpreter, arguments);
                                  
                                  QProcess::ProcessError error = process.error();
                                  qDebug() << "ERROR: " << error;
                                  
                                  if (!process.waitForStarted()) {
                                       qDebug() << "Failed to start Python process";
                                       //return 1;
                                   }
                                  
                                  // Wait for the process to finish (optional)
                                  process.waitForFinished();
                                  
                                  // Get the exit code of the process
                                  int exitCode = process.exitCode();
                                  
                                  // Handle the exit code if needed
                                  if (exitCode != 0) {
                                      qDebug() << "Python script execution failed with exit code:" << exitCode;
                                      //return 1;
                                  }
                                  return a.exec();
                                  

                                  }

                                  //Have commented out everything just trying to log for now
                                  main_od_for_rci.py
                                  if name == 'main':
                                  print("Hey there")

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

                                  @Adithya said in Qprocess exiting with exit code 255 when trying to run python script:

                                  /usr/bin/python3.exe

                                  This is for sure wrong.
                                  You're on Linux, not Windows...

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

                                  1 Reply Last reply
                                  0
                                  • AdithyaA Adithya

                                    @jsulm
                                    //trying it in main funtion itself for now , have commented everything else.
                                    main.cpp
                                    int main(int argc, char *argv[])
                                    {
                                    QApplication a(argc, argv);

                                    // Path to the Python interpreter
                                    QString pythonInterpreter = "/usr/bin/python3.exe"; // or the full path to python.exe
                                    
                                    // Path to the directory containing your Python script and other files
                                    QString workingDirectory = QDir::currentPath() + "/Tools/Extractor_OD";
                                    qDebug() << "Path = " <<workingDirectory;
                                    
                                    // Path to the Python script you want to execute
                                    QString pythonScript = QDir::currentPath() + "/Tools/Extractor_OD/main_od_for_rci.py";
                                    qDebug() << "Script Path = " <<pythonScript;
                                    
                                    // Arguments to pass to the Python script
                                    QStringList arguments;
                                    arguments << pythonScript << "1" << "2";
                                    
                                    QString command = pythonScript + " 1 2";
                                    
                                    // Create a QProcess instance
                                    QProcess process;
                                    
                                    QObject::connect(&process, &QProcess::stateChanged, [](QProcess::ProcessState newState) {
                                               qDebug() << "Process = "<< newState;
                                       });
                                    
                                    // Set the working directory
                                    //process.setWorkingDirectory(workingDirectory);
                                    
                                    // Set the command to execute
                                    process.start(pythonInterpreter, arguments);
                                    
                                    QProcess::ProcessError error = process.error();
                                    qDebug() << "ERROR: " << error;
                                    
                                    if (!process.waitForStarted()) {
                                         qDebug() << "Failed to start Python process";
                                         //return 1;
                                     }
                                    
                                    // Wait for the process to finish (optional)
                                    process.waitForFinished();
                                    
                                    // Get the exit code of the process
                                    int exitCode = process.exitCode();
                                    
                                    // Handle the exit code if needed
                                    if (exitCode != 0) {
                                        qDebug() << "Python script execution failed with exit code:" << exitCode;
                                        //return 1;
                                    }
                                    return a.exec();
                                    

                                    }

                                    //Have commented out everything just trying to log for now
                                    main_od_for_rci.py
                                    if name == 'main':
                                    print("Hey there")

                                    JonBJ Offline
                                    JonBJ Offline
                                    JonB
                                    wrote on last edited by JonB
                                    #19

                                    @Adithya said in Qprocess exiting with exit code 255 when trying to run python script:

                                    QString pythonInterpreter = "/usr/bin/python3.exe"; // or the full path to python.exe

                                    You read my answer where it said .exe is for Windows not Linux, didn't you? What happened when you tried my:

                                    So you can type /usr/bin/python3.exe in a terminal and that executes fine, right?

                                    In a terminal please copy & paste:

                                    ls -l /usr/bin/python3.exe
                                    

                                    and paste the output here.

                                    AdithyaA 1 Reply Last reply
                                    2
                                    • JonBJ JonB

                                      @Adithya said in Qprocess exiting with exit code 255 when trying to run python script:

                                      QString pythonInterpreter = "/usr/bin/python3.exe"; // or the full path to python.exe

                                      You read my answer where it said .exe is for Windows not Linux, didn't you? What happened when you tried my:

                                      So you can type /usr/bin/python3.exe in a terminal and that executes fine, right?

                                      In a terminal please copy & paste:

                                      ls -l /usr/bin/python3.exe
                                      

                                      and paste the output here.

                                      AdithyaA Offline
                                      AdithyaA Offline
                                      Adithya
                                      wrote on last edited by Adithya
                                      #20

                                      @JonB @jsulm using python3 actually worked .But not sure whether the script is being executed or not
                                      I changed .py file something like this (running in infinite loop)

                                      if name == 'main':
                                      while True:
                                      print("Hey there")

                                      The process is still running
                                      Log :
                                      Process = QProcess::Starting
                                      ERROR: QProcess::UnknownError
                                      Process = QProcess::Running

                                      But any idea why I am not getting the log .

                                      jsulmJ 1 Reply Last reply
                                      0
                                      • AdithyaA Adithya

                                        @JonB @jsulm using python3 actually worked .But not sure whether the script is being executed or not
                                        I changed .py file something like this (running in infinite loop)

                                        if name == 'main':
                                        while True:
                                        print("Hey there")

                                        The process is still running
                                        Log :
                                        Process = QProcess::Starting
                                        ERROR: QProcess::UnknownError
                                        Process = QProcess::Running

                                        But any idea why I am not getting the log .

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

                                        @Adithya said in Qprocess exiting with exit code 255 when trying to run python script:

                                        running in infinite loop

                                        Please do NOT do such infinite loops in an event driven frameworks like Qt! There is really no need for that and it blocks Qt event loop.
                                        "I am not getting the log" - please explain how you're getting this log and what do you actually mean exactly by "log". If you mean the output of your script then I already suggested to read its stderr/stdout.

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

                                        1 Reply Last reply
                                        2
                                        • AdithyaA Offline
                                          AdithyaA Offline
                                          Adithya
                                          wrote on last edited by
                                          #22

                                          Thanks guys it worked. python3 and readyReadStandardOutput(showed the log ,was expecting it to work like qDebig() and cout .My bad) . Sorry for bothering with wrong misconception.

                                          1 Reply Last reply
                                          1
                                          • AdithyaA Adithya has marked this topic as solved on

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