是否返回FindFirstFile / FindNextFile API对缓存结果？

Question

I'm not sure if this was asked already, I can't seem to find it.

When I'm doing a folder contents enumeration, you know the usual:

FindFirstFile();
do
{
}while(FindNextFile());

What happens if while I'm still in my do/while loop the contents of the folder change? Say, a new file or a folder is added, altered or removed. Is that reflected in the results returned by FindNextFile ?

Answer 1

A quick test case shows that FindFirstFile does not cache the results on a local filesystem running on Windows 7. But as soon as FindNext is called, the results are cached (not fully, only a little bit). But since this is not documented in the Windows SDK, it must be seen as an implementation detail, which could change at any time. So write your code in a way that it does not depend on this behavior.