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GUID

Started by peter86 Dec 28, 2002 at 6:34 AM 4 replies 400+ views

Original Post

Dec 28, 2002 at 6:34 AM

How do I make my own GUID? Should I just take some randomized digits and letters and put them together? And why this: { 0x590e16dd, 0x538f, 0x40fb, { 0xa7, 0xdf, 0x96, 0x54, 0xea, 0x6b, 0xe7, 0x1e } } Instead of this: { 590E16DD, 538F, 40fb, A7DF, 9654EA6BE71E }?

Neophyte

Dec 28, 2002 at 7:34 AM

If you just need to generate a GUID use the exeutable UUIDGEN.
If you need to generate it programatically (which is highly unlikely) use the function CoCreateGuid.

-Neophyte

Run_The_Shadows

Dec 28, 2002 at 8:18 AM

A GUID is a pseudo-unique number, generated mathematically to give the least likely chance of a repeating number on any machine in the world.

-This is where the world drops off
-ryan@lecherousjester.com

Neophyte

Dec 28, 2002 at 11:09 AM

Oh and by the way, the reason for the ''0x'' thing is to tell the compiler that you''re giving it hexadecimal numbers and not just some jumbled up crap.

-Neophyte

Solo

Dec 28, 2002 at 4:33 PM

quote:

A GUID is a pseudo-unique number, generated mathematically to give the least likely chance of a repeating number on any machine in the world.

Actually, if the machine that generated the GUID has a NIC installed its MAC address is used, yielding a truly unique number.

dalleboy

Dec 28, 2002 at 5:40 PM

quote:
Original post by Solo
Actually, if the machine that generated the GUID has a NIC installed its MAC address is used, yielding a truly unique number.

That is depending if you use the UuidCreate function or the UuidCreateSequential function. Read more:

quote:
MSDN
For security reasons, UuidCreate was modified so that it no longer uses a machine''s MAC address to generate UUIDs. UuidCreateSequential was introduced to allow creation of UUIDs using the MAC address of a machine''s Ethernet card.

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