关于FILETIME的比较

一直对FILETIME中的参数不太了解是什么意思， 也不知道怎么比较先后，之前都是转成systemtime再比较，感觉有点麻烦。终于发现有个API可以直接比较，CompareFileTime，具体的可以查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.