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GUID Creation

Started by davidgi Oct 11, 2005 at 12:48 PM 3 replies 650+ views

Original Post

Oct 11, 2005 at 12:48 PM

Anyone out there ever implemented a GUID (Globally Unique Identifier) generator? This is a globally unique 128-bit number that can be created on any machine such that it doesn't ever create duplicates. Or at least the probability that it will create a duplicate is astronomical. We need a function that will work on Xbox360. Thanks, Dave

Washu

Oct 11, 2005 at 12:55 PM

Nope, always used UuidCreate or CoCreateGuid (both part of Win32). You might want to look into those functions to see if they are available.

SunTzu

Oct 11, 2005 at 1:01 PM

Edit - speaking too soon!

outRider

Oct 11, 2005 at 2:01 PM

Use the date/time plus some manipulation. Don't just use date/time if you want persistent GUIDs as the chances of getting a unique ID are decreased because if the system loses power the date/time resets (on the Xbox anyway, don't know about the 360).

Try something like: 0xFFFFSMHDYYYYRRRR

TimeInSecsSinceBoot:Second:Minute:Hour:Day:Year:Random

and maybe throw in some XORS or something if needed. Time in secs since boot is probably the same function in the 360 SDK as it was in the Xbox SDK.

EliasAE

Oct 11, 2005 at 2:17 PM

Maybe RFC 4122 will give you some information about how to implement GUIDs. It even has a sample implementation at the end, which you could use.

If people come up with their own non-standard algorithms, there is a greater chance of collisions.

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