C++, how to control program flow with keyboard input


I have a main routine that loops infinitely. By changing bool variables using keyboard input, I want to be able to control whether certain if{} statements within that loop are getting called. I found this thread:<br /><a href="https://stackoverflow.com/questions/448944/c-non-blocking-keyboard-input" rel="nofollow">C non-blocking keyboard input</a>,<br /> but it seems excessively laborious and complicated for seemingly basic functionality. Is there an easier way to do it?


You'll have to use the OS/Firmware/Framework/environment API to get input events, or use a library that do this for you. Anyway, there is no built-in way of doing this in C++.

I often use <a href="http://sourceforge.net/projects/wgois/" rel="nofollow">OIS</a> in games. It's cross-platform and easy to use. Not sure it's useful for other cases than games but it does the job for you.


The <a href="http://www.libsdl.org/" rel="nofollow">SDL</a> library is one way to do it cross-platform. Here's <a href="http://www.libsdl.org/docs/html/guideinputkeyboard.html" rel="nofollow">an example of polling keyboard events</a>.


Put the main routine in a thread, then have something like

static char mode = ' '; while(mode != 27) // to allow Esc to end program { mode = _getch(); }

Threaded code can then do different things based on what key was pressed.


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