I want to control a timing loop every millisecond using ‘C’. I don’t think I can use the time & difftime functions as they only return seconds as units of time. I thought about the clock function but that only has a resolution of 10 milliseconds. Can anyone point me in the right direction here. Thanks Mark

Windows supports a High Resolution Timer. The following functions are used: BOOL QueryPerformanceFrequency( LARGE_INTEGER *lpFrequency); // lpFrequency is address of current frequency BOOL QueryPerformanceCounter( LARGE_INTEGER *lpPerformanceCount); // lpPerformanceCount is pointer to counter value Someone has written a class to encapsulate this: The CPerfTimer timer class http://www.codeproject.com/datetime/perftimer.asp If you do not want to use the class you can at least look at it to get an idea of how to use the high resolution timer. Note: thers is no guarantee that your hardware supports the high resolution timer. Use the return value of QueryPerformanceFrequency to find out.