關於FILETIME的比較

一直對FILETIME中的參數不太瞭解是什麼意思， 也不知道怎麼比較先後，之前都是轉成systemtime再比較，感覺有點麻煩。終於發現有個API可以直接比較，CompareFileTime，具體的可以查MSDN。

 

CompareFileTime

 

The CompareFileTime function compares two file times.

 

LONG CompareFileTime(
  const FILETIME* lpFileTime1,
  const FILETIME* lpFileTime2
);

Parameters

lpFileTime1

[in] Pointer to a FILETIME structure that specifies the first file time.

lpFileTime2

[in] Pointer to a FILETIME structure that specifies the second file time.

Return Values

The return value is one of the following values.

Return value	Description
-1	First file time is earlier than second file time.
0	First file time is equal to second file time.
1	First file time is later than second file time.