Build errors in tutorial sample project

Stan Huang

I followed steps in tutorial: https://wiki.qt.io/Qt_for_Beginners
I built the first project (File --> New File or Project --> Other projects --> Empty QMake Project --> ...) I created a source file main.cpp as indicated in the tutorial.
main.cpp:
#include <QApplication>
#include <QPushButton>

int main(int argc, char **argv)
{
QApplication app (argc, argv);

QPushButton button ("Hello world !");
button.show();

return app.exec();
}

I tried to build it and I got compilation errors: QApplication: file not found
QPushButton: file not found
.....
I opened the project file and found only lines of:

SOURCES +=
main.cpp

Not as in tutorial:

TEMPLATE = app
TARGET = name_of_the_app

QT = core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

SOURCES += main.cpp

How come?

SGaist

Hi,

The tutorial says:
In a project file, there is some minimal code that should always be written :

TEMPLATE = app
TARGET = name_of_the_app

QT = core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

Which means that you have to add it to your project because as the name of the template suggests, it's an empty project to get you started.

Stan Huang

I modified project file as you said and it works then. Thanks.