Data file only opened by 1 app.

[Guest]

Hi

In an app that I', writing, I would like to implement the similar to the
functionality in MS Word where Word detects wether a *.doc file has already
been opened in another instance of Word. I guess I would set some file
attribute like read-only or something on the file - however, does anyone know
of any other smart way to secure that a the same data file is only opened in
one instance of a program at a time.

Thanks.

Jesper.

 

[John Timney \(MVP\)]

You should be able to open it exclusively whihc will rpevent anyone else
opening it

FileStream myStream = File.Open(FileName, FileMode.Open, FileAccess.Write,
FileShare.None);

Regards

John Timney (MVP)
http://www.johntimney.com
http://www.johntimney.com/blog

 

[Kerem Gümrükcü]

Hi

In an app that I', writing, I would like to implement the similar to the
functionality in MS Word where Word detects wether a *.doc file has
already
been opened in another instance of Word. I guess I would set some file
attribute like read-only or something on the file - however, does anyone
know
of any other smart way to secure that a the same data file is only opened
in
one instance of a program at a time.

Thanks.

Jesper.

Hi Jesper,

this depends on the "opening" application how it opens
the file. It can e.g. open the file with different FileShare-Modes.
Take a look at this:

[File.Open Method (String, FileMode, FileAccess, FileShare)]
http://msdn2.microsoft.com/en-us/library/y973b725.aspx

[FileShare Enumeration]
http://msdn2.microsoft.com/en-us/library/system.io.fileshare.aspx

This should be a good guide,...


Best regards

Kerem Gümrükcü