[Newbies] Do I need to close a FileStream?

Bert Freudenberg bert at freudenbergs.de
Sat Mar 24 08:25:39 UTC 2007

On Mar 24, 2007, at 8:34 , Tim Johnson wrote:

> Hi,
> Do I need to worry about closing a read-only FileStream when I am  
> done reading from it?

Yes. Always. A common pattern is

	f := ... open the file stream ....
	[ ... do something with f ... ] ensure: [f close]

This ensures f is closed even if there is an error in your processing  

> What happens if I don't?

Bad Things ;) I'm not exactly sure.

> How can I tell if I have lots of open files in my system?   
> "FileStream allInstances inspect"?

You would need to use #allSubInstances and check if they're open.

- Bert -

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