Can I convert a CFUUID to 30 characters or less?

Question

I need to create an identifier for my iOS user that is unique. Unfortunately the database that it will be saved to has a set length of 30 characters and CFUUID's are 36 (32 if removing the dashes).

Is there a way to make it into a smaller string? I think CFUUID's are hex, so would it be possible to convert it to full ASCII?

Answer 1

Jeff Atwood covers this in Equipping our ASCII Armor. A Base64 encoded GUID results in 22 (24 including ==) bytes. There are also other ascii formats you can use based on the post but Base64 will likely be the friendliest with the database server.