How do I compare two CFUUIDs (Mac OS X Carbon/CoreFoundation)?

Question

How can I compare two CFUUIDRefs from the CoreFoundation Carbon framework in Mac OS X? Is there an easier way to check if two CFUUIDs are equal other than converting them to strings and then comparing those?

Answer 1

A CFUUID is a kind of CFType, so you would use the same CFEqual function you use for any other CF objects.

Answer 2

I'm not sure if there is a canonical or recommended method per se, but would the following suffice?

#define CompareUUIDs(u1, u2) memcmp(CFUUIDGetUUIDBytes(u1), CFUUIDGetUUIDBytes(u2))

It would be used as follows:

if (CompareUUIDs(u1, u2) == 0) {
    // UUIDs are equal
} // etc..

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Alternatively, as you're only really interested in whether they are equal or not:

#define UUIDsAreEqual(u1, u2) (memcmp(CFUUIDGetUUIDBytes(u1), CFUUIDGetUUIDBytes(u2)) == 0)

It would be used as follows:

if (UUIDsAreEqual(u1, u2)) {
    // UUIDs are equal
} // etc..