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

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  • J jsulm
    2 Apr 2024, 06:16

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

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    Adithya
    wrote on 2 Apr 2024, 06:43 last edited by
    #4

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

    1 Reply Last reply
    0
    • A Adithya
      2 Apr 2024, 06:35

      @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

      J Offline
      J Offline
      jsulm
      Lifetime Qt Champion
      wrote on 2 Apr 2024, 06:59 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

      A 1 Reply Last reply 2 Apr 2024, 07:58
      0
      • A Adithya
        2 Apr 2024, 06:12

        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 Online
        J Online
        J.Hilk
        Moderators
        wrote on 2 Apr 2024, 07:00 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.

        A 1 Reply Last reply 2 Apr 2024, 07:59
        1
        • J jsulm
          2 Apr 2024, 06:59

          @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?

          A Offline
          A Offline
          Adithya
          wrote on 2 Apr 2024, 07:58 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().

          J 1 Reply Last reply 2 Apr 2024, 07:59
          0
          • J J.Hilk
            2 Apr 2024, 07:00

            @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.

            A Offline
            A Offline
            Adithya
            wrote on 2 Apr 2024, 07:59 last edited by
            #8

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

            J 1 Reply Last reply 2 Apr 2024, 08:09
            0
            • A Adithya
              2 Apr 2024, 07:58

              @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().

              J Offline
              J Offline
              jsulm
              Lifetime Qt Champion
              wrote on 2 Apr 2024, 07:59 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

              A 1 Reply Last reply 2 Apr 2024, 08:04
              0
              • J jsulm
                2 Apr 2024, 07:59

                @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?

                A Offline
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                Adithya
                wrote on 2 Apr 2024, 08:04 last edited by
                #10

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

                J 1 Reply Last reply 2 Apr 2024, 08:08
                0
                • A Adithya
                  2 Apr 2024, 08:04

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

                  J Offline
                  J Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on 2 Apr 2024, 08:08 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

                  A 1 Reply Last reply 2 Apr 2024, 08:27
                  1
                  • A Adithya
                    2 Apr 2024, 07:59

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

                    J Online
                    J Online
                    J.Hilk
                    Moderators
                    wrote on 2 Apr 2024, 08:09 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.

                    A 1 Reply Last reply 2 Apr 2024, 08:20
                    0
                    • J J.Hilk
                      2 Apr 2024, 08:09

                      @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");
                      
                      A Offline
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                      Adithya
                      wrote on 2 Apr 2024, 08:20 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
                      • J jsulm
                        2 Apr 2024, 08:08

                        @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.

                        A Offline
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                        Adithya
                        wrote on 2 Apr 2024, 08:27 last edited by Adithya 4 Feb 2024, 08:29
                        #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

                        J 1 Reply Last reply 2 Apr 2024, 08:33
                        0
                        • A Adithya
                          2 Apr 2024, 08:27

                          @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

                          J Offline
                          J Offline
                          jsulm
                          Lifetime Qt Champion
                          wrote on 2 Apr 2024, 08:33 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

                          A 1 Reply Last reply 2 Apr 2024, 08:43
                          0
                          • A Adithya
                            2 Apr 2024, 06:35

                            @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

                            J Online
                            J Online
                            JonB
                            wrote on 2 Apr 2024, 08:41 last edited by JonB 4 Feb 2024, 08:42
                            #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
                            • J jsulm
                              2 Apr 2024, 08:33

                              @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.

                              A Offline
                              A Offline
                              Adithya
                              wrote on 2 Apr 2024, 08:43 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")

                              J J 2 Replies Last reply 2 Apr 2024, 08:45
                              0
                              • A Adithya
                                2 Apr 2024, 08:43

                                @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")

                                J Offline
                                J Offline
                                jsulm
                                Lifetime Qt Champion
                                wrote on 2 Apr 2024, 08:45 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
                                • A Adithya
                                  2 Apr 2024, 08:43

                                  @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")

                                  J Online
                                  J Online
                                  JonB
                                  wrote on 2 Apr 2024, 08:48 last edited by JonB 4 Feb 2024, 08:54
                                  #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.

                                  A 1 Reply Last reply 2 Apr 2024, 09:02
                                  2
                                  • J JonB
                                    2 Apr 2024, 08:48

                                    @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.

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                                    Adithya
                                    wrote on 2 Apr 2024, 09:02 last edited by Adithya 4 Feb 2024, 09:04
                                    #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 .

                                    J 1 Reply Last reply 2 Apr 2024, 09:05
                                    0
                                    • A Adithya
                                      2 Apr 2024, 09:02

                                      @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 .

                                      J Offline
                                      J Offline
                                      jsulm
                                      Lifetime Qt Champion
                                      wrote on 2 Apr 2024, 09:05 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
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                                        Adithya
                                        wrote on 2 Apr 2024, 09:13 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
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                                        • A Adithya has marked this topic as solved on 2 Apr 2024, 09:13

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