Re: File saving -- how is it done?
Re: File saving -- how is it done?
- Subject: Re: File saving -- how is it done?
- From: Laurence Harris <email@hidden>
- Date: Thu, 26 Apr 2007 17:17:12 -0400
On Apr 26, 2007, at 5:00 PM, Ian Archer wrote:
I've noticed that some mac applications do file saves through what
appears to be a write'n'swap system. One can observe something like:
/Users/name/.TemporaryItems/folders.501/TemporaryItems/(A Document
Being Saved By OmniGraffle)/test.graffle
Although at least TextEdit and probably many others do this. My
assumption is that there is some function call or series of function
calls which accomplish this. I can't tell whether this file is
written to, then replaced with the destination file, or whether this
is some hard link that is written to.
I am curious:
a) what is the high level call (if any) which generates this outcome
b) what are the low level commands which implement this functionality.
Thanks for any help you can provide!
If you're using Carbon File Manager APIs, you can use
FSExchangeObjects on volumes that support it. I don't know if Cocoa
has an equivalent. I think a lot of software just does the obvious
thing: write to a file with a temporary name, delete the old file,
rename the new file.
carbon-dev and cocoa-dev, depending on what you're using, would be
better for questions like this as they have a lot more people
subscribed to them. I think this list is more for people doing file-
system related development. This is the first posting I've seen here
in months.
Larry
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