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    <p>A simple example could be something like this. Say you have a class like ProgramStarter:</p> <pre><code>#include &lt;QObject&gt; class ProgramStarter : public QObject { Q_OBJECT public slots: void startProgram() { //Do stuff } }; </code></pre> <p>and something like this where ProgramStarter is used:</p> <pre><code>#include &lt;QtGui/QApplication&gt; #include &lt;QPushButton&gt; #include &lt;QObject&gt; #include "programstarter.h" int main(int argc, char *argv[]) { QApplication app(argc, argv); QPushButton *testButton = new QPushButton("Push me"); testButton-&gt;resize(100, 40); testButton-&gt;show(); ProgramStarter *program = new ProgramStarter; QObject::connect(testButton, SIGNAL(clicked()), program, SLOT(startProgram())); return app.exec(); } </code></pre> <p>Qt uses signals and slots to communicate between objects. The core idea is that signals are emitted when events occur and these signals can be connected to slots. In this case the button emits a clicked() signal when the button is pressed and the clicked() signal is connected to the startProgram() slot. So when the button is pressed, startProgram() is called.</p> <p>Qt has a meta-object system for enabling the use of signals and slots, among other things. This is the reason why ProgramStarter inherits QObject and why the Q_OBJECT macro is in the header. I highly suggest reading this if you want to understand how signals and slots and the meta-object system work in Qt: <a href="http://doc.qt.io/qt-5/signalsandslots.html" rel="nofollow">http://doc.qt.io/qt-5/signalsandslots.html</a></p>
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    1. COThank you for your response, however I cannot seem to access any of the functions that I need to from my GUI. Please see the additional details I have added to my original question.
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