On Jun 4, 2013, at 12:32 PM, Hank Bao wrote: > I tried to set the offset property of a file NSOutputStream by > NSStreamFileCurrentOffsetKey with appending enabled with code listed below.
Appending isn't "enabled", per se, it's a mode for the underlying file descriptor that forces data to always be appended to the end of the file. See the open() system call and O_APPEND for the low-level equivalent. What you're looking for is opening for writing without truncating. It doesn't seem as though NSOutputStream supports that. You may want to look into NSFileHandle instead. > The document says that NSStreamFileCurrentOffsetKey allows me to manipulate > the current read or write position in file-based streams. That probably means that you can seek within a write stream for a file opened and truncated (after you've written some data, of course). Regards, Ken _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
