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How to use QProcess for restarting the device

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  • N Offline
    N Offline
    NTCYP
    wrote on last edited by NTCYP
    #1

    Hi,

    Unlike a pc type, my device works continuesly (7/24). Somehow the user must re-start the device.
    My shotdown look like this;

    system("poweroff");
    

    Poweroff works nicely. And yesterday I use QProcess for the ping command as;

       // Create QProcess object
        proc = new QProcess();
        proc->start("ping", QStringList() << "-c" << "3" << QString(m_sHostName));
    

    For the restart first I try to use;

    system("shutdown -r 0");
    

    and nothing happened. So I decided to use QProcess for start as;

            // Create QProcess object
            procR = new QProcess();
            procR->start("shutdown" << "-r" << "0");
    

    then I get a compile error as;

    /home/ntms/Desktop/ELITCARD/mainwindow.cpp:374: error: invalid operands of types 'const char [9]' and 'const char [3]' to binary 'operator<<'
    

    Any help please,

    Kind Regards

    K 1 Reply Last reply
    0
    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      Look again at your ping start line to build the parameters.

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

      N 1 Reply Last reply
      0
      • SGaistS SGaist

        Hi,

        Look again at your ping start line to build the parameters.

        N Offline
        N Offline
        NTCYP
        wrote on last edited by
        #3

        @SGaist Thank you again.

        I forget the "reboot". My device usr/sbin had a rebboot app so simply I call as;

        system("reboot");
        

        And its works nicely. For shutdown, poweroff and the reboot doesn't need any parameters.

        Kind Regards,

        1 Reply Last reply
        0
        • SGaistS Offline
          SGaistS Offline
          SGaist
          Lifetime Qt Champion
          wrote on last edited by
          #4

          You can also use QProcess and not pass any arguments

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

          N 1 Reply Last reply
          0
          • N NTCYP

            Hi,

            Unlike a pc type, my device works continuesly (7/24). Somehow the user must re-start the device.
            My shotdown look like this;

            system("poweroff");
            

            Poweroff works nicely. And yesterday I use QProcess for the ping command as;

               // Create QProcess object
                proc = new QProcess();
                proc->start("ping", QStringList() << "-c" << "3" << QString(m_sHostName));
            

            For the restart first I try to use;

            system("shutdown -r 0");
            

            and nothing happened. So I decided to use QProcess for start as;

                    // Create QProcess object
                    procR = new QProcess();
                    procR->start("shutdown" << "-r" << "0");
            

            then I get a compile error as;

            /home/ntms/Desktop/ELITCARD/mainwindow.cpp:374: error: invalid operands of types 'const char [9]' and 'const char [3]' to binary 'operator<<'
            

            Any help please,

            Kind Regards

            K Offline
            K Offline
            koahnig
            wrote on last edited by
            #5

            @NTCYP said:

                    // Create QProcess object
                    procR = new QProcess();
                    procR->start("shutdown" << "-r" << "0");
            

            Just saw that you had a C++ syntax problem. You try to stream char arrays into a char array. That is not healthy and the reason why the compiler complains.

            Vote the answer(s) that helped you to solve your issue(s)

            1 Reply Last reply
            0
            • SGaistS SGaist

              You can also use QProcess and not pass any arguments

              N Offline
              N Offline
              NTCYP
              wrote on last edited by
              #6

              @SGaist Yes both worked. It seems much faster to use system("reboot"). Device is not accessible from network. So I don't have any security concern to use "system". Thank you for your insight, appreciated.

              Kind Regards,

              1 Reply Last reply
              0

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