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No such file or directory #include <QtWidgets>

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  • T Offline
    T Offline
    tymop
    wrote on last edited by
    #1

    Hello,
    I am a beginner with qt, and I just download and install the last vesion of qt with this link "qt-opensource-linux-x64-1.5.0-2-online.run":http://download.qt-project.org/official_releases/online_installers/qt-opensource-linux-x64-1.5.0-2-online.run

    Then, I tried some examples to understand how qt works, but i have the save error with each examle I tried. This is an example
    @/opt/qt/5.2.1/gcc_64/examples/widgets/tutorials/addressbook/part1/addressbook.cpp:41: erreur : QtWidgets: No such file or directory
    #include <QtWidgets>@

    always the same error : @erreur : QtWidgets: No such file or directory #include <QtWidgets>@

    Is there anything especial to do to work with the examples ?

    what is the problem ?

    Thank a lot for your help.

    A 1 Reply Last reply
    0
    • C Offline
      C Offline
      clochydd
      wrote on last edited by
      #2

      Hi, and welcome to DevNet,
      You should only add QT += widgets in your .pro file and not include QtWidgets

      1 Reply Last reply
      0
      • N Offline
        N Offline
        nandhu_kp
        wrote on last edited by
        #3

        greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

        use this in your .pro file

        1 Reply Last reply
        0
        • T Offline
          T Offline
          tymop
          wrote on last edited by
          #4

          I tried your 2 solutions, but i still have a problem:
          A lot of functions are not declared.
          This is the example I tested: childwidget (with the modifications you gave me)

          childwidget.pro:
          @greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

          SOURCES = main.cpp

          install

          target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tutorials/widgets/childwidget
          INSTALLS += target
          @

          main.cpp
          @//! [main program]
          //#include <QtWidgets>

          int main(int argc, char *argv[])
          {
          QApplication app(argc, argv);
          QWidget window;
          window.resize(320, 240);
          window.setWindowTitle(QApplication::translate("childwidget", "Child widget"));
          window.show();

          //! [create, position and show]
          QPushButton *button = new QPushButton(
          QApplication::translate("childwidget", "Press me"), &window);
          button->move(100, 100);
          button->show();
          //! [create, position and show]
          return app.exec();
          }
          //! [main program]
          @

          And this is an extract of the errors (only the 2 first) i have when i compile:

          @/opt/qt/5.2.1/gcc_64/examples/widgets/tutorials/widgets/childwidget/main.cpp:46: erreur : 'QApplication' was not declared in this scope
          QApplication app(argc, argv);
          ^
          /opt/qt/5.2.1/gcc_64/examples/widgets/tutorials/widgets/childwidget/main.cpp:46: erreur : expected ';' before 'app'
          QApplication app(argc, argv);
          ^
          @

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          0
          • X Offline
            X Offline
            Xander84
            wrote on last edited by
            #5

            you have to include the Qt classes you need, for a simple program like this you can include the whole module but I would not recommend that because it will drastically increase compile time.
            @
            #include <QApplication>
            #include <QWidget>
            #include <QPushButton>
            @
            essentially you have to include all Qt classes like this, if you want to do it right. :)

            if you are lazy or have a super fast computer you can include whole Qt modules at once with
            @
            #include <QtCore>
            #include <QtGui>
            #include <QtWidgets>
            ...
            @
            i would only use that if you need many classes from one module.

            1 Reply Last reply
            0
            • T Offline
              T Offline
              tymop
              wrote on last edited by
              #6

              Thank you,
              with your help, I managed to run the example.

              I find it unfortunate that the examples do not work as they are.
              That make the learning more difficult.

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              1
              • C Offline
                C Offline
                clochydd
                wrote on last edited by
                #7

                Usually, the examples work as they are.
                I have opened your examples/widgets/tutorials/addressbook/part1 with the Qt Creator, built it and had no errors.
                How did you work with the example?

                1 Reply Last reply
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                • T Offline
                  T Offline
                  tymop
                  wrote on last edited by
                  #8

                  That is strange, because, as I said, I just install qtcreator with the script qt-opensource-linux-x64-1.5.0-2-online.run, in the /opt directory/

                  Then, I open it and tried some examples, and I have the same problem eact time.

                  1 Reply Last reply
                  1
                  • X Offline
                    X Offline
                    Xander84
                    wrote on last edited by
                    #9

                    Do you open the examples from Qt creator directly? (Welcome -> examples)
                    they should work out of the box.

                    And is there a reason you use and old version of Qt? I mean that is like 2 years old or something. :)

                    1 Reply Last reply
                    0
                    • T Offline
                      T Offline
                      tymop
                      wrote on last edited by
                      #10

                      Do you open the examples from Qt creator directly? No : I opened with open file or project

                      And is there a reason you use and old version of Qt? I used the version found on the site web qt-opensource-linux-x64-1.5.0-2-online.run

                      I tried another version comming from the ubuntu deposite(Qt Creator 3.0.1) , but there was another problem because the binary /usr/bin/qmlpuppet was not installed (because not in the ubuntu deposite), and I did not find he way to install it.

                      1 Reply Last reply
                      0
                      • X Offline
                        X Offline
                        Xander84
                        wrote on last edited by
                        #11

                        I have Qt 5.2.1 running on my Ubuntu machine, using the online installer (qt-linux-opensource-1.5.0-x64-online.run in my case), worked like a charm so I don't know what you did. You have so weird bugs, I have no idea why, sorry.

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                        0
                        • C Offline
                          C Offline
                          clochydd
                          wrote on last edited by
                          #12

                          I think we should try to find out, what happend to your install.
                          If you look at your Creator's About screen, do you see this:
                          Qt Creator 3.1.0 (opensource)
                          Based on Qt 5.2.1 (GCC 4.6.1, 64 bit)
                          Try to compare your Creator settings with "this: ":http://qt-project.org/doc/qtcreator-3.1/creator-configuring.html

                          1 Reply Last reply
                          0
                          • T Offline
                            T Offline
                            tymop
                            wrote on last edited by
                            #13

                            Thank form your help.
                            This is the version installed
                            @Qt Creator 3.0.1
                            Based on Qt 5.2.1 (GCC 4.8.2, 64 bit)
                            Built on Apr 9 2014 at 09:12:59
                            @

                            And the version from the .run
                            @Qt Creator 3.1.0 (opensource)
                            Basé sur Qt 5.2.1 (GCC 4.6.1, 64 bit)
                            Compilé le Apr 14 2014 à 15:03:42
                            Depuis la révision 52592aa879@

                            But it is strange because, now, the qtcreator installed from the unbuntu deposites is now working. Maybe the .run install added the missing files ?

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                            • C Offline
                              C Offline
                              clochydd
                              wrote on last edited by
                              #14

                              As the Qt Creator 3.1.0 is the newest version it would be better to use it instead of 3.0.1 - but if you succeed with 3.0.1 you shouldn't have problems.
                              Perhaps you may give 5.3.0 a try when it's released in a few days.

                              1 Reply Last reply
                              0
                              • T tymop

                                Hello,
                                I am a beginner with qt, and I just download and install the last vesion of qt with this link "qt-opensource-linux-x64-1.5.0-2-online.run":http://download.qt-project.org/official_releases/online_installers/qt-opensource-linux-x64-1.5.0-2-online.run

                                Then, I tried some examples to understand how qt works, but i have the save error with each examle I tried. This is an example
                                @/opt/qt/5.2.1/gcc_64/examples/widgets/tutorials/addressbook/part1/addressbook.cpp:41: erreur : QtWidgets: No such file or directory
                                #include <QtWidgets>@

                                always the same error : @erreur : QtWidgets: No such file or directory #include <QtWidgets>@

                                Is there anything especial to do to work with the examples ?

                                what is the problem ?

                                Thank a lot for your help.

                                A Offline
                                A Offline
                                AlexeiK
                                wrote on last edited by
                                #15

                                @tymop
                                Провести настройку комплектов под Qt5
                                На вкладке Проекты провести настройку проекта заново с верными компеляторами

                                1 Reply Last reply
                                0

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