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Check if GetSystemTimePreciseAsFileTime() is available and fallback to GetSystemTimeAsFileTime() #357

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Check if GetSystemTimePreciseAsFileTime() is available and fallback to GetSystemTimeAsFileTime() #357

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19 changes: 18 additions & 1 deletion source/c/astronomy.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1013,7 +1013,24 @@ astro_time_t Astronomy_CurrentTime(void)
FILETIME ft;
ULARGE_INTEGER large;
/* Get time in 100-nanosecond units from January 1, 1601. */
GetSystemTimePreciseAsFileTime(&ft);
/* GetSystemTimePreciseAsFileTime is only available since Windows 8 */
typedef void (WINAPI *GetSystemTimePreciseAsFileTimeFunc)(LPFILETIME);
GetSystemTimePreciseAsFileTimeFunc pGetSystemTimePreciseAsFileTime = NULL;
HMODULE hModule = GetModuleHandleA("kernel32.dll");
if (hModule) {
union {
FARPROC proc;
GetSystemTimePreciseAsFileTimeFunc func;
} converter;
converter.proc = GetProcAddress(hModule, "GetSystemTimePreciseAsFileTime");
pGetSystemTimePreciseAsFileTime = converter.func;
}
// Use the function if available, otherwise fallback
if (pGetSystemTimePreciseAsFileTime) {
pGetSystemTimePreciseAsFileTime(&ft);
} else {
GetSystemTimeAsFileTime(&ft);
}
large.u.LowPart = ft.dwLowDateTime;
large.u.HighPart = ft.dwHighDateTime;
sec = (large.QuadPart - 116444736000000000ULL) / 1.0e+7;
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