SYSTEMTIME与__int64的相互转换

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1. SYSTEMTIME转__int64

__int64 SystemTimeToInt64(const SYSTEMTIME& itime){FILETIME ft;SystemTimeToFileTime(&itime, &ft);ULARGE_INTEGER ularge;ularge.LowPart = ft.dwLowDateTime;ularge.HighPart = ft.dwHighDateTime;__int64 int64 = ularge.QuadPart;return int64;}

2. __int64转SYSTEMTIME

SYSTEMTIME Int64ToSystemTime(const __int64& itime){FILETIME ft;SYSTEMTIME st;ULARGE_INTEGER ularge;__int64 tmptimeA, tmptimeB;tmptimeA = itime;tmptimeB = itime;ularge.HighPart = (DWORD)(tmptimeA>>32);ularge.LowPart = (DWORD)((tmptimeB<<32)>>32);ft.dwLowDateTime = ularge.LowPart;ft.dwHighDateTime = ularge.HighPart;FileTimeToSystemTime(&ft, &st);return st;}

3. 使用例子

SYSTEMTIME timeA, timeB;GetSystemTime(&timeA);printf("当前时间：%d-%d-%d %d:%d:%d/n", timeA.wYear, timeA.wMonth, timeA.wDay, timeA.wHour, timeA.wMinute, timeA.wSecond);__int64 itime = SystemTimeToInt64(timeA);printf("当前时间：%lld/n", itime);timeB = Int64ToSystemTime(itime);printf("当前时间：%d-%d-%d %d:%d:%d/n", timeB.wYear, timeB.wMonth, timeB.wDay, timeB.wHour, timeB.wMinute, timeB.wSecond);