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Problem with creating first project and the book "C++-gui-programming-with-qt-4-2ndedition"

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  • S Offline
    S Offline
    sierdzio
    Moderators
    wrote on 11 Jun 2014, 09:34 last edited by
    #5

    Put C++ code (the whole snippet above) into main.cpp file.

    In .pro file, type this:
    @
    QT += core gui widgets

    SOURCES += main.cpp
    @

    Should work.

    (Z(:^

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    • K Offline
      K Offline
      Kurdman
      wrote on 11 Jun 2014, 12:46 last edited by
      #6

      I made a Qt Widget Application like what "sierdzio" has said, named "test.pro".
      These are the things which are written on it be default:

      @#-------------------------------------------------

      Project created by QtCreator 2014-06-11T11:37:42

      #-------------------------------------------------

      QT += core gui

      greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

      TARGET = test
      TEMPLATE = app

      SOURCES += main.cpp
      mainwindow.cpp

      HEADERS += mainwindow.h

      FORMS += mainwindow.ui
      @

      Now where to put that simple snip code please?

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      • J Offline
        J Offline
        Jeroentjehome
        wrote on 11 Jun 2014, 13:51 last edited by
        #7

        Hi,
        When you generate a "empty" widget project, you get a project file (test.pro) a main file (main.cpp) and your first class declaration (MainWindow.cpp) if you selected to add a mainwindow widget to the project.
        Your main function in main.cpp should look like this:
        @
        int main(int argc,char *argv[])
        {
        QApplication app(argc, argv);
        QLabel *label = new QLabel("Hello Qt!");
        label->show();
        return app.exec();
        }
        @
        This is to generate a QApplication which you need 1 off in every program (or a QCoreApplication etc if no widgets are used etc). The QApplication handles the Event loop and a hole lot of other stuff.
        Your MAinWindow class is not used for now, but that will come later.

        Greetz, Jeroen

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        • K Offline
          K Offline
          Kurdman
          wrote on 11 Jun 2014, 14:03 last edited by
          #8

          Completely mixed up!

          Please read the thread from beginning. My question is very simple. I gave the first example of the book and said how to make a project and put that snip code into that and run it.
          I should first solve this problem and then be familiar with other parts of Qt.
          This is the window of test.pro which I created it:
          http://tinypic.com/view.php?pic=5ltrgj&s=8#.U5hiG3KSzis

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          • J Offline
            J Offline
            Jeroentjehome
            wrote on 11 Jun 2014, 14:28 last edited by
            #9

            No, I'm not mixed up!
            My explanation is very basic and noob proof.

            Don't change the pro file! Leave it alone, this comes later. The pro file is used by QMake (you will learn later) how to compile.

            Then open the source folder (you know the little triangle in front of it). Then double click the main.cpp file (this will open it in creator). Then place your code there in the main function and delete the MainWindow creation for now.
            You should get a window with only a button into it. It can't get any more simple then that!

            Greetz, Jeroen

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            • K Offline
              K Offline
              Kurdman
              wrote on 11 Jun 2014, 15:06 last edited by
              #10

              After much attempt I could to run the code. It worked. Please look at my code window screen in below link. Is everything fine to you?
              http://tinypic.com/r/1265n3k/8

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              • C Offline
                C Offline
                clochydd
                wrote on 11 Jun 2014, 15:24 last edited by
                #11

                That looks fine and you should no get that window with one button.
                And you now have a way to work through the book using the Creator.

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                • K Offline
                  K Offline
                  Kurdman
                  wrote on 11 Jun 2014, 15:36 last edited by
                  #12

                  OK mate. Thank you very much for assigning your time for helping me.

                  I try to read that book carefully but it doesn't seem to be clear for beginners (for example now I should try to solve this: From a command prompt, change the directory to "test" and type qmake -project).

                  Thanks also to all of other guys that helped me.

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                  • C Offline
                    C Offline
                    clochydd
                    wrote on 11 Jun 2014, 16:15 last edited by
                    #13

                    If you want to know how to build projects without the IDE, working from the command prompt would help.
                    But it is not necessary as you may work completely from the Creator and the Qt Creator runs qmake and make for you.

                    I think it is now helpful, if you try one of the examples supplied with Creator and then step back to the book and merge the code from the book to the IDE.

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                    • K Offline
                      K Offline
                      Kurdman
                      wrote on 11 Jun 2014, 16:26 last edited by
                      #14

                      I'm sorry, I don't know at all how to try one of those examples. And I wrote that qmake and command prompt because they exist in the book and I just quoted them from the book.
                      Since I read that not clear book I have to follow what it says:(.

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                      • A Offline
                        A Offline
                        andreyc
                        wrote on 11 Jun 2014, 18:32 last edited by
                        #15

                        I started to learn Qt from "this":http://qt-project.org/doc/qt-5/tutorials-addressbook.html tutorial.
                        Try it.

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                        • C Offline
                          C Offline
                          clochydd
                          wrote on 11 Jun 2014, 18:54 last edited by
                          #16

                          That is a good tutorial and you may find the Qt Examples here:
                          Qt Creator -> Welcome -> Examples
                          Happy coding :)

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                          • K Offline
                            K Offline
                            Kurdman
                            wrote on 11 Jun 2014, 19:32 last edited by
                            #17

                            Thank you all very much. I try to read that tut. You are awesome guys* ;)*

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                            11 Jun 2014, 16:26

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