Getsystemtimepreciseasfiletime Windows 7 Info

When Microsoft released the Platform Update for Windows 7 (KB2670838), they quietly back-ported several newer APIs. For a while, developers noticed that GetSystemTimePreciseAsFileTime existed on some Windows 7 boxes.

: The most straightforward solution is to upgrade to Windows 8 or a later version, where GetSystemTimePreciseAsFileTime is available.

void GetSystemTimePreciseAsFileTime( LPFILETIME lpSystemTimeAsFileTime ); getsystemtimepreciseasfiletime windows 7

This article is the definitive guide to understanding, implementing, and troubleshooting GetSystemTimePreciseAsFileTime on Windows 7.

To implement a high-precision time feature for Windows 7, you must use a fallback method or an alternative API. Recommended Alternatives for Windows 7 GetSystemTimePreciseAsFileTime error on Windows 7 #101 When Microsoft released the Platform Update for Windows

This function, introduced with Windows 8, was backported to Windows 7 via a specific update. But its existence, behavior, and proper usage on Windows 7 are shrouded in confusion, undocumented dependencies, and surprising pitfalls.

On Windows, this eventually calls GetSystemTimeAsFileTime . (~16ms) on Windows 7. Avoid for precision. But its existence, behavior, and proper usage on

#include typedef VOID (WINAPI *PGSTPAFT)(LPFILETIME); void GetPreciseTime(LPFILETIME lpFileTime) // Try to find the precise function in kernel32.dll HMODULE hKernel32 = GetModuleHandleW(L"kernel32.dll"); PGSTPAFT pGetSystemTimePreciseAsFileTime = (PGSTPAFT)GetProcAddress(hKernel32, "GetSystemTimePreciseAsFileTime"); if (pGetSystemTimePreciseAsFileTime) // Use high-precision timer if running on Windows 8 or later pGetSystemTimePreciseAsFileTime(lpFileTime); else // Fallback for Windows 7: Standard resolution (approx. 15.6ms) GetSystemTimeAsFileTime(lpFileTime); Use code with caution. Copied to clipboard 3. Alternative for High Precision on Windows 7

For subsequent requests, calculate the elapsed time using QueryPerformanceCounter and add it to your base time. 4. Summary Table GetSystemTimeAsFileTime GetSystemTimePreciseAsFileTime Windows 2000 Precision < 1 microsecond Windows 7 Support Yes No