On Wed, Mar 25, 2009 at 11:44 PM, Jeff Laing <jeff.la...@spatialinfo.com> wrote: >>> Is there a way to read one line of a text file at a time >>> using NSFileHandle (the way fgets does)? >> >> This code illustrates how you might approach >> filtering lines of data obtained through an NSFileHandle. > > I've come across this problem as well - its fine to say "read it all > into memory, then split it into lines seperated by my arbitrary > delimiter", but that doesn't work in small-memory environments (like the > iPhone) for big files which would otherwise be fine to parse line by > line. > > Answers of the form "...but how do you know what the delimiter character > is, Unicode, blah blah" aren't all that helpful. Lets assume that when > someone says fgets() they *know* that they want to access an 8-bit > ascii, newline-delimited text file line by line.
Note that "8-bit ascii" is an oxymoron. ASCII is a 7-bit encoding by definition. However the good news is that nearly any encoding of interest (UTF-16 being a notable exception) will preserve characters like \n and \r and will not produce those bytes to indicate other meanings. Treating the file as a raw bag of bytes and parsing for \r or \n will work for virtually every situation. > So far, the only answer I've ever seen is to fall back on > fopen()/fgets() Certainly that's a good way to go. It's also relatively easy to do your own buffering using NSFileHandle or the like and essentially implement your own line-reading scheme that way. Mike _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) 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: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
