ragner.org

Hi all,

I am studying Qt and I want to do some posts about.

So I will start with a simple hello world and talking how to compile its source code.

= main.cpp =

#include <QtGui/QApplication>
#include <QtGui/QLabel>

int main(int argc, char *argv[])
{

    /* All Qt application need implements a QApplication */
    QApplication app(argc, argv); 

    /* Here QLabel is the main window! */
    QLabel label("Hello, world!");

    /* Shows the QLabel */
    label.show();

    /* Enters the main event loop and waits until exit() is called. */
    return app.exec();
}

=

Now you need to create the .pro file with the project’s configurations and dependencies.

To create the .pro file you can just run:

$  qmake -project

The command above will create a .pro file with the same name of the directory where is the source code.

To create the Makefile run:

$ qmake

So to complie the source code run:

$ make

You will see a binary file with the same name of the .pro file.

References:

http://doc.trolltech.com/4.5/classes.html

http://doc.trolltech.com/4.5/widgets-tutorial.html

http://doc.trolltech.com/4.5/qmake-manual.html