How to determine a file is in-use

Archive: How to determine a file is in-use

roger_aol
20th September 2004 23:00 UTC

How to determine a file is in-use
Hi,

Can anyone provides help on How to determine a file is in-use?

Thanks,
Roger

Anders
21st September 2004 02:41 UTC

one probably not so good way to do it would be to call CreateFile (with write access) using the system plugin

Takhir
21st September 2004 08:05 UTC

in CreateFile also set dwCreationDisposition to CREATE_NEW - otherwise this may open existing file "in-use" if FILE_SHARE_WRITE mode was set by another application.

Afrow UK
21st September 2004 17:51 UTC

I'd use FileOpen.

E.g.

Push $R0
 ClearErrors
 FileOpen $R0 "file.ext" r
 FileClose $R0
 IfErrors 0 +2
 DetailPrint "file.ext is locked!"
Pop $R0

-Stu

Takhir
23rd September 2004 11:48 UTC

2 Afrow UK

BTW 2 programs can open and read the same file if "share read" permission was used on file open (in Windows too :) ). Most likelly NSIS uses the same CreateFile API call for FileOpen implementation, and FILE_SHARE_READ flag presents in calls I can see in nsis\source code.