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How to Execute SCP command to transfer files to a target machine

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  • M moyin

    @jsulm i tried this, it does't works.

        connect(&proc, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
        connect(&proc, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutput()));
        connect(&proc, SIGNAL(errorOccurred()), this, SLOT(readOutput()));
        proc.startDetached(command,params) ;
    

    And did changes in readoutput() also,

        ui->textEdit_Standard_output->setText(ui->textEdit_Standard_output->toPlainText() + StdOut + StdError);
    
    
    jsulmJ Offline
    jsulmJ Offline
    jsulm
    Lifetime Qt Champion
    wrote on last edited by
    #17

    @moyin You again did not read documentation, right? http://doc.qt.io/qt-5/qprocess.html#errorOccurred
    Else you would see that errorOccurred() has a parameter.
    This connect cannot succeed (you should see a warning at runtime):

    connect(&proc, SIGNAL(errorOccurred()), this, SLOT(readOutput()));
    

    You need to use another slot with QProcess::ProcessError error parameter and print out its value.

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

    M 1 Reply Last reply
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    • jsulmJ jsulm

      @moyin You again did not read documentation, right? http://doc.qt.io/qt-5/qprocess.html#errorOccurred
      Else you would see that errorOccurred() has a parameter.
      This connect cannot succeed (you should see a warning at runtime):

      connect(&proc, SIGNAL(errorOccurred()), this, SLOT(readOutput()));
      

      You need to use another slot with QProcess::ProcessError error parameter and print out its value.

      M Offline
      M Offline
      moyin
      wrote on last edited by
      #18

      @jsulm i can transfer file successfully to the target machine without errors. but wanted to redirect logs whatever (stdout,stderr, etc..,) to textedit. than
      why should go for QProcess::ProcessError.

      jsulmJ 1 Reply Last reply
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      • M moyin

        @jsulm i can transfer file successfully to the target machine without errors. but wanted to redirect logs whatever (stdout,stderr, etc..,) to textedit. than
        why should go for QProcess::ProcessError.

        jsulmJ Offline
        jsulmJ Offline
        jsulm
        Lifetime Qt Champion
        wrote on last edited by
        #19

        @moyin Then check whether these connects actually were successful:

        qDebug() << connect(&proc, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
        qDebug() << connect(&proc, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutput()));
        

        Place a qDebug() in your readOutput() to print something out to see whether the slot is actually called.

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

        M 2 Replies Last reply
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        • jsulmJ jsulm

          @moyin Then check whether these connects actually were successful:

          qDebug() << connect(&proc, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
          qDebug() << connect(&proc, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutput()));
          

          Place a qDebug() in your readOutput() to print something out to see whether the slot is actually called.

          M Offline
          M Offline
          moyin
          wrote on last edited by
          #20

          @jsulm i mentioned u already that, while debug if i put break point at or in readoutput() that will stop at break point so it means slot is not getting called.

          jsulmJ M 2 Replies Last reply
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          • M moyin

            @jsulm i mentioned u already that, while debug if i put break point at or in readoutput() that will stop at break point so it means slot is not getting called.

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

            @moyin said in How to Execute SCP command to transfer files to a target machine:

            while debug if i put break point at or in readoutput() that will stop at break point so it means slot is not getting called

            sorry, I'm confused: if it stops at the break point inside readOutput() then it means that it is actually called.

            Try this:

            void Transfer::readOutput()
            {
                QString StdOut = proc.readAllStandardOutput();  //Reads standard output
                QString StdError = proc.readAllStandardError(); // Reads standard error
                qDebug() << StdOut;
                qDebug() << StdError;
            //    ui->textEdit_Standard_output->setText(StdOut);
            //    ui->textEdit_Standard_output->setText(StdError);
                ui->textEdit_Standard_output->setText(ui->textEdit_Standard_output->toPlainText() + StdOut + StdError);
            }
            

            Do you see anything in Application Output?

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

            1 Reply Last reply
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            • M moyin

              @jsulm i mentioned u already that, while debug if i put break point at or in readoutput() that will stop at break point so it means slot is not getting called.

              M Offline
              M Offline
              moyin
              wrote on last edited by
              #22

              @moyin said in How to Execute SCP command to transfer files to a target machine:

              that will stop

              sorry correction "that will not stop at breakpoint"

              1 Reply Last reply
              0
              • sierdzioS Offline
                sierdzioS Offline
                sierdzio
                Moderators
                wrote on last edited by
                #23

                @moyin said in How to Execute SCP command to transfer files to a target machine:

                proc.startDetached(command,params) ;

                Hm, startDetached() is a static call, so attaching any signals to it won't work, right? Shouldn't start() be used here instead? Just a thought, I have not analysed this code in-depth.

                (Z(:^

                1 Reply Last reply
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                • jsulmJ jsulm

                  @moyin Then check whether these connects actually were successful:

                  qDebug() << connect(&proc, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
                  qDebug() << connect(&proc, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutput()));
                  

                  Place a qDebug() in your readOutput() to print something out to see whether the slot is actually called.

                  M Offline
                  M Offline
                  moyin
                  wrote on last edited by
                  #24

                  @jsulm its printing true for both

                  qDebug() << connect(&proc, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
                  qDebug() << connect(&proc, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutput()));```
                  
                  qDebug() in readOutput() is not printing any thing.
                  
                  
                  
                  jsulmJ 1 Reply Last reply
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                  • M moyin

                    @jsulm its printing true for both

                    qDebug() << connect(&proc, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
                    qDebug() << connect(&proc, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutput()));```
                    
                    qDebug() in readOutput() is not printing any thing.
                    
                    
                    
                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by jsulm
                    #25

                    @moyin This is your problem:

                    proc.startDetached(command,params) ;
                    

                    startDetached() is a static method! So you start your process, but it is not managed by the proc instance! Use start() instead:

                    proc.start(command, params);
                    

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

                    M 1 Reply Last reply
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                    • jsulmJ jsulm

                      @moyin This is your problem:

                      proc.startDetached(command,params) ;
                      

                      startDetached() is a static method! So you start your process, but it is not managed by the proc instance! Use start() instead:

                      proc.start(command, params);
                      
                      M Offline
                      M Offline
                      moyin
                      wrote on last edited by
                      #26

                      @jsulm i tried that also but failed.

                      jsulmJ 1 Reply Last reply
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                      • M moyin

                        @jsulm i tried that also but failed.

                        jsulmJ Offline
                        jsulmJ Offline
                        jsulm
                        Lifetime Qt Champion
                        wrote on last edited by
                        #27

                        @moyin In what way failed? Same issue? Slot still not called?

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

                        M 3 Replies Last reply
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                        • jsulmJ jsulm

                          @moyin In what way failed? Same issue? Slot still not called?

                          M Offline
                          M Offline
                          moyin
                          wrote on last edited by
                          #28

                          @jsulm sorry, failed in the sense not able to print the logs into textEdit.

                          1 Reply Last reply
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                          • jsulmJ jsulm

                            @moyin In what way failed? Same issue? Slot still not called?

                            M Offline
                            M Offline
                            moyin
                            wrote on last edited by
                            #29

                            @jsulm yes slot is not getting called itself.

                            1 Reply Last reply
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                            • jsulmJ jsulm

                              @moyin In what way failed? Same issue? Slot still not called?

                              M Offline
                              M Offline
                              moyin
                              wrote on last edited by
                              #30

                              @jsulm
                              Slot still not called? Yes still not called.

                              jsulmJ JonBJ 2 Replies Last reply
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                              • M moyin

                                @jsulm
                                Slot still not called? Yes still not called.

                                jsulmJ Offline
                                jsulmJ Offline
                                jsulm
                                Lifetime Qt Champion
                                wrote on last edited by
                                #31

                                @moyin Can you post your current code?

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

                                1 Reply Last reply
                                0
                                • M moyin

                                  @jsulm
                                  Slot still not called? Yes still not called.

                                  JonBJ Offline
                                  JonBJ Offline
                                  JonB
                                  wrote on last edited by
                                  #32

                                  @moyin
                                  I'm lost as to where you're at.

                                  But at least at one point you were told to use QProcess::startDetached() rather than QProcess:start(). I believe (untested by me, as usual, could be putting my neck on the line...) that you cannot properly redirect process input/output and/or get signals for input/output if you run the child process detached...?

                                  jsulmJ 1 Reply Last reply
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                                  • JonBJ JonB

                                    @moyin
                                    I'm lost as to where you're at.

                                    But at least at one point you were told to use QProcess::startDetached() rather than QProcess:start(). I believe (untested by me, as usual, could be putting my neck on the line...) that you cannot properly redirect process input/output and/or get signals for input/output if you run the child process detached...?

                                    jsulmJ Offline
                                    jsulmJ Offline
                                    jsulm
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #33

                                    @JNBarchan This was already mentioned, but @moyin says that it isn't working even after changing to start().
                                    There most be still something in the code, that's why I asked for the current code.

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

                                    JonBJ 1 Reply Last reply
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                                    • jsulmJ jsulm

                                      @JNBarchan This was already mentioned, but @moyin says that it isn't working even after changing to start().
                                      There most be still something in the code, that's why I asked for the current code.

                                      JonBJ Offline
                                      JonBJ Offline
                                      JonB
                                      wrote on last edited by JonB
                                      #34

                                      @jsulm
                                      OK, as long he is not trying startDetached that's good...

                                      FWIW, I happen to just be working on my own Dialog which spawns a sub-process (QProcess::start()), gets its output via signals, and copies it into scrolling text widget, and it's all working fine for me. As one would expect!

                                      Purely BTW, given the command is an scp whose job is to copy the files, I wonder just what stdout/stderr output he is expecting? Has he informed us whether it's just the output that's missing/empty, or whether the whole command is not running in any case??

                                      1 Reply Last reply
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                                      • M Offline
                                        M Offline
                                        Mary M. Steele
                                        Banned
                                        wrote on last edited by
                                        #35
                                        This post is deleted!
                                        1 Reply Last reply
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