converting NSDictionary object to NSData object and vice-versa

Question

I have to convert an NSDictionary object into NSData and further I have to get the same NSDictionary out of the NSData ob

Answer 1

A much simpler version of Robert's answer:

[NSKeyedArchiver archiveRootObject:YOURDICTIONARY toFile:YOURFILEPATH];

And, correspondingly:

YOURDICTIONARY = [NSKeyedUnarchiver unarchiveObjectWithFile:YOURFILEPATH];

Or to answer the question as originally set, without imputing a file into things:

NSData *data = [NSKeyedArchiver archivedDataWithRootObject:YOURDICTIONARY];
...
YOURDICTIONARY = [NSKeyedUnarchiver unarchiveObjectWithData:data];

It's all factory methods so it's the same code with or without ARC; the methods used have been available since OS X v10.2 and on iOS since day one.