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Is there a built in function equivalent to .NET’s
Guid.NewGuid(); in Cocoa?
My desire is to produce a string along the lines of 550e8400-e29b-41d4-a716-446655440000 which represents a unique identifier.
UUIDs are handled in Core Foundation, by the CFUUID library. The function you are looking for is CFUUIDCreate.
FYI for further searches: these are most commonly known as UUIDs, the term GUID isn’t used very often outside of the Microsoft world. You might have more luck with that search term.