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    [Moved] QT and data input in ubuntu terminal

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    • G
      goetz last edited by

      Probably your code is wrong.

      Sorry, that's much too less information to give you a reasonable answer. You can provide us the source code for a

      • short
      • complete
      • compilable
      • runnable

      program that demonstrates us the problem and we'll have a look.

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

      1 Reply Last reply Reply Quote 0
      • D
        denya last edited by

        Here is the code:

        @
        #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, please use @-tags, Volker]

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        • T
          tobias.hunger last edited by

          How does this code relate to Qt?

          1 Reply Last reply Reply Quote 0
          • D
            denya last edited by

            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
              denya last edited by

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

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              • G
                goetz last edited by

                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
                  denya last edited by

                  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
                    denya last edited by

                    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
                      goetz last edited by

                      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
                        goetz last edited by

                        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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                        • mzimmers
                          mzimmers last edited by

                          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
                            goetz last edited by

                            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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                            • mzimmers
                              mzimmers last edited by

                              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
                                goetz last edited by

                                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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                                • mzimmers
                                  mzimmers last edited by

                                  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
                                    tobias.hunger last edited by

                                    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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                                    • mzimmers
                                      mzimmers last edited by

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

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                                      • G
                                        goetz last edited by

                                        [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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                                        • mzimmers
                                          mzimmers last edited by

                                          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
                                            goetz last edited by

                                            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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