<![CDATA[how to break while loop using some conditional check?]]>Hi
I am using SQLite database to fetch the data in Qt and then I am printing that data simultaneosly.
Kindly go through the process

(e.g.

   while(studentList.next())
                 {  studentList("SELECT Name, address FROM class  WHERE Roll No = some variable;
                  Name=studentList.value(0).toString();   
                  address=studentList.value(1).toString();   


 //********   simultaneously I am printing this data (in a string) through GPIO pins by setting them HIGH accordingly.....    ******  //
                                  

{


      ------  PRINTING MODULE ------

 }
                 }

During printing, GUI goes in a hang state .....
Now I want to break this printing in between as per my wish!
Any way to do it!

]]>https://forum.qt.io/topic/92674/how-to-break-while-loop-using-some-conditional-checkRSS for NodeSun, 19 Jul 2026 09:15:34 GMTMon, 16 Jul 2018 06:40:20 GMT60<![CDATA[Reply to how to break while loop using some conditional check? on Mon, 23 Jul 2018 06:39:11 GMT]]>Your loop blocks the event loop so it can't process anything.

]]>https://forum.qt.io/post/471402https://forum.qt.io/post/471402Mon, 23 Jul 2018 06:39:11 GMT<![CDATA[Reply to how to break while loop using some conditional check? on Mon, 16 Jul 2018 09:55:34 GMT]]>See "Staying Responsive During Intensive Processing" page 171 (189 of the pdf) of C++ GUI Programming with Qt 4

]]>https://forum.qt.io/post/469741https://forum.qt.io/post/469741Mon, 16 Jul 2018 09:55:34 GMT<![CDATA[Reply to how to break while loop using some conditional check? on Mon, 16 Jul 2018 09:32:29 GMT]]>@SGaist Right now I m in the learning stage of threading..so a bit difficult for me to apply it directly
Could u plz quote an example which can be referred?

]]>https://forum.qt.io/post/469737https://forum.qt.io/post/469737Mon, 16 Jul 2018 09:32:29 GMT<![CDATA[Reply to how to break while loop using some conditional check? on Mon, 16 Jul 2018 07:38:31 GMT]]>If the time the printing module takes is rather short, it may already be enough to break the loop and put the loops body in a QTimers slot that you call regularly in short intervalls.

So in the time between the timers slots Qt has time to execute it's event loop.

]]>https://forum.qt.io/post/469715https://forum.qt.io/post/469715Mon, 16 Jul 2018 07:38:31 GMT<![CDATA[Reply to how to break while loop using some conditional check? on Mon, 16 Jul 2018 07:19:32 GMT]]>Hi,

Depending on how you do that printing and more specifically the time it takes, you should rather offload the work to a secondary thread.

]]>https://forum.qt.io/post/469710https://forum.qt.io/post/469710Mon, 16 Jul 2018 07:19:32 GMT