Getsystemtimepreciseasfiletime Windows 7 Upd

C# cannot directly call this API without P/Invoke, but you can use:

[DllImport("kernel32.dll", SetLastError = true)]
static extern void GetSystemTimePreciseAsFileTime(out long lpSystemTimeAsFileTime);

Again, check for missing entry point exceptions and fall back to DateTime.UtcNow (which internally uses GetSystemTimeAsFileTime). getsystemtimepreciseasfiletime windows 7 upd

Released in February 2013, this update was primarily aimed at improving DirectX 11.1 support, but it also brought several system API enhancements, including: C# cannot directly call this API without P/Invoke,

Contrary to popular belief, this API is available on Windows 7 – but only after installing a specific update. Again, check for missing entry point exceptions and

| Windows Version | GetSystemTimePreciseAsFileTime available? | |----------------|----------------------------------------------| | Windows 7 RTM | ❌ No | | Windows 7 SP1 (no updates) | ❌ No | | Windows 7 SP1 + KB3033929 | ✅ Yes | | Windows 7 SP1 + Convenience Rollup KB3125574 | ✅ Yes | | Windows 8 and later | ✅ Yes (natively) |

Convert QueryPerformanceCounter to a FILETIME by recording a reference time at startup. This requires careful handling of counter frequency and system time adjustments.