取得两个 FILETIME 的时间差

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如果为SYSTEMTIME，可以通过SystemTimeToFileTime先转到FILETIME

#define NOMINMAX #include <algorithm> #include <windows.h>  SYSTEMTIME systemtime_difference(SYSTEMTIME const& st1, SYSTEMTIME const& st2) {     FILETIME ft1;     SystemTimeToFileTime(&st1, &ft1);     ULARGE_INTEGER const u1 = { ft1.dwLowDateTime, ft1.dwHighDateTime };      FILETIME ft2;     SystemTimeToFileTime(&st2, &ft2);     ULARGE_INTEGER const u2 = { ft2.dwLowDateTime, ft2.dwHighDateTime };      ULARGE_INTEGER u3;     u3.QuadPart = std::max(u1.QuadPart, u2.QuadPart) - std::min(u1.QuadPart, u2.QuadPart);     FILETIME const ft3 = { u3.LowPart, u3.HighPart };      SYSTEMTIME st3;     FileTimeToSystemTime(&ft3, &st3);     // FILETIME's starting point is 1601-01-01     st3.wYear -= 1601;     st3.wMonth -= 1;     st3.wDay -= 1;     st3.wDayOfWeek = 0; // useless for this purpose, make it always 0 so it's always ignored     return st3; }  int main() {     SYSTEMTIME const st1 = { 2008, 10, 3, 15, 6, 5, 31, 12 };     SYSTEMTIME const st2 = { 2009, 12, 0, 27, 10, 7, 59, 56 };     SYSTEMTIME st3 = systemtime_difference(st1, st2);      return 0; }

感谢：http://social.msdn.microsoft.com/Forums/en-US/vcgeneral/thread/fe975619-5e19-45e0-82cd-797ff7745712