how to call different Win API based on Windows version?

The specific problem is, the support of condition variable on Windows begins from Vista, for early version of Windows (Windows XP), I have a emulated condition variabl开发者_C百科e code sort of solved the problem. However, I'd like to have the ability to call native condition variable API when the system supported and fallback to my version only on XP and earlier version. I tried to detect windows version with GetVersionInfo API, but it still gives me error on start time (cannot find API entry of InitializeConditionVariable sort of).

I am not familiar with Windows programming, how do you solve the gentle fallback problem nicely?

if you want to call a function that may or may not exist depending on platform version then use dynamic loading

LoadLibrary and GetProcAddress

These will tell you if the entry point exists and then let you call it if it does