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  4. [Moved] QT and data input in ubuntu terminal

[Moved] QT and data input in ubuntu terminal

Scheduled Pinned Locked Moved Qt Creator and other tools
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  • D Offline
    D Offline
    denya
    wrote on last edited by
    #5

    Sorry, the code was displayed wrong in the previous post:

    @
    #include <iostream>
    using namespace std;
    #include <cctype>

    int fuct (int);

    int main()
    {
    int n;

        cout << "Input number: ";
        while (cin >> n)
        {
                int fk = fuct (n);
                cout << "\nFactorial: " << fk << "\n";
                cout << "Input number: ";
        }
    
        return 0;
    

    }

    int fuct (int n)
    {
    if (n == 0) return 1;
    else if (n == 1) return 1;
    else return n * fuct(n-1);
    }
    @

    [EDIT: code formatting, Volker]

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    • D Offline
      D Offline
      denya
      wrote on last edited by
      #6

      so, if it has not relation to Qt it will not work properly?

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      • G Offline
        G Offline
        goetz
        wrote on last edited by
        #7

        Nothing is wrong, it works for me.

        Also this has nothing to do with Qt.

        http://www.catb.org/~esr/faqs/smart-questions.html

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        • D Offline
          D Offline
          denya
          wrote on last edited by
          #8

          I have understood about Qt, but input data doesn`t work in the console:


          Launching /home/denis/tutorial-build-desktop/tutorial...
          Input number: 1

          1
          2
          2w

          d
          c

          I can input everything and the programm doesn`t have any reaction.

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          • D Offline
            D Offline
            denya
            wrote on last edited by
            #9

            The debugger wrote:

            &"warning: GDB: Failed to set controlling terminal: \320\235\320\265\320\264\320\276\320\277\321\203\321\201\321\202\320\270\320\274\321\213\320\271 \320\260\321\200\320\263\321\203\320\274\320\265\320\275\321\202\n"

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            • G Offline
              G Offline
              goetz
              wrote on last edited by
              #10

              If you have a console application that reads from the console then please do start it on the console and neither in a debugger nor in your IDE.

              EDIT: PS: If you had provided us that information before, you would have got an answer.

              http://www.catb.org/~esr/faqs/smart-questions.html

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              • G Offline
                G Offline
                goetz
                wrote on last edited by
                #11

                Moved to tools forum, as it seems to be an issue with how to use Qt Creator properly.

                http://www.catb.org/~esr/faqs/smart-questions.html

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                • mzimmersM Offline
                  mzimmersM Offline
                  mzimmers
                  wrote on last edited by
                  #12

                  Hi, Volker -

                  So, do I understand from your post above that if a program needs console input, we can't/shouldn't launch it from Creator?

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                  • G Offline
                    G Offline
                    goetz
                    wrote on last edited by
                    #13

                    At least it's hard to debug, because you have no means to input your data (at least I'm not aware of one), so your program hangs once it tries to read from stdin.

                    http://www.catb.org/~esr/faqs/smart-questions.html

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                    • mzimmersM Offline
                      mzimmersM Offline
                      mzimmers
                      wrote on last edited by
                      #14

                      OK, thanks. I suppose that, given that Qt is a GUI development system, this is reasonable, though it may surprise some people who come from a more conventional IDE like Eclipse.

                      Is there at least a way to launch the terminal from Qt? Some minor level of integration would make it a little easier.

                      EDIT: let me rephrase that: there does appear to be some kind of terminal integration (though I can't get it to work for me); can one launch an app to terminal from Qt while still controlling the app through the Qt debugger? That would be slick.

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                      • G Offline
                        G Offline
                        goetz
                        wrote on last edited by
                        #15

                        It's not a problem of GUI or console development. You can have console input on a GUI program too :-)

                        Ah, seems that I was wrong!

                        In the run settings (project view of Creator) you can check a checkbox "run in terminal", this might be what you want. It's a bit cumbersome on the mac though (I remember you being on OS X, right?). You must set the terminal application on the mac to

                        /Applications/Utilities/Terminal.app/Contents/MacOS/Terminal

                        (Settings, Environment, first tab)

                        http://www.catb.org/~esr/faqs/smart-questions.html

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                        • mzimmersM Offline
                          mzimmersM Offline
                          mzimmers
                          wrote on last edited by
                          #16

                          That sure seems like it should work, doesn't it? But, when I try to start a debug session, I get an error message at launch, saying it can't start the terminal emulator '/Applications/Utilities/Terminal.app/Contents/MacOS/Terminal'. Dunno...

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                          • T Offline
                            T Offline
                            tobias.hunger
                            wrote on last edited by
                            #17

                            There actually is a "launch in terminal" in the run settings of your project in Qt Creator... Go to project mode and visit the run settings there.

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                            • mzimmersM Offline
                              mzimmersM Offline
                              mzimmers
                              wrote on last edited by
                              #18

                              I assume you mean the "Run in terminal" check box? I have that checked. Still doesn't go.

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                              • G Offline
                                G Offline
                                goetz
                                wrote on last edited by
                                #19

                                [quote author="mzimmers" date="1302358795"]That sure seems like it should work, doesn't it? But, when I try to start a debug session, I get an error message at launch, saying it can't start the terminal emulator '/Applications/Utilities/Terminal.app/Contents/MacOS/Terminal'. Dunno...
                                [/quote]

                                This should work. Where is your Terminal.app located? You'll need to enter

                                /path/to/Terminal.app/Contents/MacOS/Terminal

                                into the config field.

                                EDIT: You actually are on a Mac, aren't you?

                                http://www.catb.org/~esr/faqs/smart-questions.html

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                                • mzimmersM Offline
                                  mzimmersM Offline
                                  mzimmers
                                  wrote on last edited by
                                  #20

                                  Heh...yes, I'm on a Mac, and the path you provided above is indeed the correct one. No idea why it's not working.

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                                  • G Offline
                                    G Offline
                                    goetz
                                    wrote on last edited by
                                    #21

                                    For me it works, but the new terminal window is launched in the background. You have to select it via the dock or the running apps selector (cmd-tab). Also, the newly opened terminal is not quit once you terminate your application, you have to quit it manually (and watch out that you do not quit your regular terminal!)

                                    http://www.catb.org/~esr/faqs/smart-questions.html

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                                    • mzimmersM Offline
                                      mzimmersM Offline
                                      mzimmers
                                      wrote on last edited by
                                      #22

                                      Oho!

                                      I just went back into preferences, and this time, I hit the apply button. This time the terminal launched. I had assumed just hitting "OK" would have done this for me.

                                      Thanks for the help.

                                      EDIT: just as an FYI for anyone reading this thread, note that while Terminal will launch your application, it will do so from the context of the default directory for your user account, NOT the directory that the application is in. You may need to move around data files or engage in directory processing within your program to achieve the desired results.

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                                      • mzimmersM Offline
                                        mzimmersM Offline
                                        mzimmers
                                        wrote on last edited by
                                        #23

                                        Also, the newly opened terminal is not quit once you terminate your application, you have to quit it manually (and watch out that you do not quit your regular terminal!)

                                        I seem to be having the opposite problem. My terminal window goes away, but according to the Application Output view, the app hasn't terminated yet. I hit the red square, and get a warning that the app is still running. Not a showstopper, but odd...

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                                        • G Offline
                                          G Offline
                                          goetz
                                          wrote on last edited by
                                          #24

                                          Yes, unless you do not have a means to quit the application, say ctrl-c, it works this way :-( You'll have to quit the app via the kill button in Creator.

                                          http://www.catb.org/~esr/faqs/smart-questions.html

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