Re: [boost] temp file

From: Matt Doyle (mdoyle_at_[hidden])
Date: 2005-09-09 15:28:05

> Matt Doyle wrote:
> >>I didn't know about that, because on win32 there is a problem with
> >>deleting open files.
> > 
> > 
> > Using the WIN32 call CreateFile specify FILE_ATTRIBUTE_TEMPORARY. 
> > 
> > from MSDN -> FILE_ATTRIBUTE_TEMPORARY - A file is being 
> used for temporary storage. File systems avoid writing data 
> back to mass storage if sufficient cache memory is available, 
> because an application deletes a temporary file after a 
> handle is closed. In that case, the system can entirely avoid 
> writing the data. Otherwise, the data is written after the 
> handle is closed.
> > 
> > You still can't delete an open file but you can possibly 
> avoid ever creating the file in the first place..
> 
> But then you have to carefully craft the spec, as users may 
> expect to be able to
> share the file (by name) among processes. There are clearly 
> different use
> cases for temporary files, so it is important to capture the 
> most important ones.

Ah, that's true. There is a different flag that could be used FILE_FLAG_DELETE_ON_CLOSE which won't delete it until "all" handles to the file are closed but I really can't vouch for it because I haven't used that one. I've no idea what kind of nasty undocumented luggage it brings along with it. Given the source, I like to try it before I believe it ;)

Matt

> 
> Regards,
> 		Stefan
> 
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