Developing Qt applications

This recipe will show how to build, run, and debug a graphical Qt application using Qt Creator.

Getting ready

Before launching Qt Creator, we check whether we are able to build and launch a Qt application manually. We will build a Qt hello world application.

Here is the code for qt_hello_world.cpp:

#include <QApplication>
#include <QPushButton>

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

     QPushButton hello("Hello world!");

     hello.show();
     return app.exec();
 }

To build it, we use the meta-toolchain-qt installed as described previously:

$ source /opt/poky/1.7.1/environment-setup-cortexa9hf-vfp-neon-poky- linux-gnueabi
$ qmake -project
$ qmake
$ make

This uses qmake to create a project file and a Makefile file with all the relevant code files in the folder.

To run it, we first need to build a filesystem with Qt support. We first prepare the environment as follows:

$ cd /opt/yocto/fsl-community-bsp/
$ source setup-environment...