How to call a function every x seconds [closed]

Answer 1

There are two approaches: 1.Asynchronous 2. Synchronous

1. Assuming that you are using Win32, C++. You can use Win32 API SetTimer

   UINT_PTR timerid = SetTimer(NULL, 0, milliseconds, &callback);

2. If you would like a Polling Approach You would better use something like that

     for(;;) 
       {
   
       Say_Hello();
       // Sleep for 50*1000ms
       Sleep(50000);
   
       }
   

Answer 2

In your main-loop, get the time and compare it to the last time you called the function (initialized to "now" when declaring it). If it's larger than your interval then call your function and set the "last-time-called" variable to the current time.

Answer 3

For a timer more cross-platform and utilizing the c++ STL, take a look at C++ Cross-Platform High-Resolution Timer.

From there, simply create and call a function in a loop every 10 ~ 50 seconds using two of those cross-platform timers mentioned above.

Answer 4

The Boost library provides for this in Boost.Asio, and explicitly covers this in its tutorials:

• Synchronous timer, i.e. waiting until the timer expires.

• Asynchronous timer, i.e. continuing with your program and having the callback function invoked when the timer expires.

If you didn't find the Boost library when searching the web for C++, your google-fu is weak. ;-)