How to give a delay in loop execution using Qt

Question

In my application I want that when a loop is being executed  each time the control transfers to the loop  each execution must be delayed by a particular time  How can I do this

User · Answer

So this question is nearly 10 years old  but it popped up on one of my searches  and I think that there are better solutions when programming in Qt  Signals  amp  slots  timers  and finite state machines  The delays that are required can be implemented without sleeping the application in a way that interrupts other functions  and without concurrent programming and without spinning the processor - the Qt application will sleep when there are no events to process   A hack for this is to have a sequence of timers with their timeout   signal connected to the slot for the event  which then kicks off the second timer  This is nice because it is simple  It s not so nice because it quickly becomes difficult to troubleshoot and maintain if there are logical branches  which there generally will be outside of any toy example    QTimer  A better  more flexible option is the State Machine infrastructure within Qt  There you can configure an framework for an arbitrary sequence of events with multiple states and branches  An FSM is much easier to define  expand and maintain over time   Qt State Machine

User · Answer

EDIT  removed wrong solution   EDIT  to add this other option    Another way to use it would be subclass QThread since it has protected  sleep methods   QThread  usleep unsigned long microseconds   QThread  msleep unsigned long milliseconds   QThread  sleep unsigned long second     Here s the code to create your own  sleep method    include  lt QThread gt       class Sleeper   public QThread   public      static void usleep unsigned long usecs  QThread  usleep usecs        static void msleep unsigned long msecs  QThread  msleep msecs        static void sleep unsigned long secs  QThread  sleep secs         and you call it by doing this   Sleeper  usleep 10   Sleeper  msleep 10   Sleeper  sleep 10     This would give you a delay of 10 microseconds  10 milliseconds or 10 seconds  accordingly  If the underlying operating system timers support the resolution

User · Answer

C  11 has some portable timer stuff  Check out sleep for

User · Answer

As an update of  Live s answer  for Qt   5 2 there is no more need to subclass QThread  as now the sleep functions are public      Static Public Members         QThread    currentThread     Qt  HANDLE     currentThreadId     int    idealThreadCount     void   msleep unsigned long msecs    void   sleep unsigned long secs    void   usleep unsigned long usecs    void   yieldCurrentThread        cf http   qt-project org doc qt-5 qthread html static-public-members

[qt] How to give a delay in loop execution using Qt

Examples related to qt

Examples related to loops