how to know a file is accessed by another process

[NotProfessional]

My program is watching for a directory on any incoming file and then move it to other places. Another application produce the data file to that directory. The problem is: my program always get the error message: access violation So, how can I know from program point of view that the file is accessed by another process? Is there any related API? Thanks in advance.

[Heath Stewart]

For files opened over a share, you can use NetFileEnum. For the local system, there is a function or two in the Win32 API but they are undocumented and unreferenced. There is a program called "handles" available at http://www.sysinternals.com/ntw2k/freeware/handle.shtml[^] that can show you open handles. I have examined this executable for the exports it uses but there are a lot of undocumented functions with somewhat ambiquous names.

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