Qt5: How to create interrupt driven gpio button based qt app
<p>My problem is......... I am trying to develop an application.In this application there are certain pages and which is displaying on the LCD on my board.and my board has a gpio button by default the value of this button is high when i press this button value of this button become low after releasing again high.i want to make my app interrupt based when i pressed hold button for 3 second display should be rotate and if i just press and release button page should change.In my app i have interface my gpio button.</p>

<pre><code>QString btnInput = "/sys/class/gpio/gpioN/value";
</code></pre>

<p>In my apps I can read the value from value file when my app start after that if i press button nothing will happen.what should i do.
how can i generate interrupt after pressing button.</p>

<p>please help me i am new in qt I start qt just before 2 week. </p>