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Create a base project to show a simple dialog starting from an empty project

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Hi ! I’m studying Qt 5.2. I downloaded the mingw “edition”. I need you help to have a step-by-step [and updated) info about starting a widget app. I do this Start the QtCreator Choose the Other Projects -> Empty Qt Project Choose the source dir Actually I got an empty .pro. Ok. Now I’d like to create just a dialog right-click on project name and add Qt->Qt Desgner Form Class I choose Dialog withouth buttons and leave othe properties untouched Add a button Save all right-click on project and add c++ -> c++ source file, calling it main.cpp Now my .pro looks as: FORMS += \     dialog.ui   HEADERS += \     dialog.h   SOURCES += \     dialog.cpp \     main.cpp The main question is: what’s the best-practice code ? I used this #include "dialog.h" #include <QApplication>   int main(int argc, char *argv[]) {     QApplication a(argc, argv);     Dialog w;     w.show();       return a.exec(); } But i got this error: C:\Qt_Projects\Hello10\dialog.h:4: error: QDialog: No such file or directory #include <QDialog> ^ What’s the problem.. ?

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