Before my users save files they've opened I want to first detect if
any other users (on the network or otherwise) have modified the file.
I want to do this by checking the mod date on the file before the
user saves, and then compare this date to the mod date when the file
was opened.
My application is NSDocument based.
Currently am doing the following:
1. Caching the mod date when the file is opened in awakeFromNib in
MyDocument. 2. I compare the current mod date to the cached copy at
the top of NSDocument's writeToFile.
3. Then at the end of writeToFile I'm re-caching the date.
If this were working, I wouldn't be writing. ;-)
I'm writing the file data with [NSData writeToFile:path atomically:YES].
There's lots of exchanging going on. Cocoa appears to be
threading/delaying the file writes somehow. And the modification
dates I'm getting back are never correct. (Because of the caching.)
I'm currently grabbing the modification dates with stat(2). I'm
getting my file path with [[document_ fileName]
fileSystemRepresentation].
Where are the best places to hook into NSDocument to get accurate
modification dates on files for caching and comparison?
Thanks,
Sanford
PS - I've read TN2037 and don't want to implement file locking.
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