GUID generator

[Jim Ault]

the milliseconds might be a little better.

Jim Ault
Las Vegas


On 6/20/08 9:44 PM, "Sarah Reichelt" <sarah.reichelt at gmail.com> wrote:

> If these have to be unique, I would base them on "the seconds" as that
> is very unlikely to be duplicated, unless you generate them all at
> once, so produce many per second.
> Converting the seconds to hex gives 8 characters, so that could be
> most of the first segment in your ID.
> 
> Then you could add in some machine-specific identifier if the IDs
> generated by different people all had to be unique.
> 
> Then pad it out to the correct length with random characters as before.
> 
> Cheers,
> Sarah
> 
> 
> On Sat, Jun 21, 2008 at 2:12 PM, Sivakatirswami <katir at hindu.org> wrote:
>> I'm building a PicLens Publisher here that will do pretty much what the
>> current PicLens Publisher does from CoolIris, with some additions to their
>> Media RSS format that their app does not do.
>> (see www.piclens.com)
>> 
>> One thing I need to emulate is their GUID (Global Unique ID) generator which
>> outputs unique len(36) random strings like
>> 
>> 557B4610-65DC-4FEA-B6DC-32C3FA4B374D
>> 
>> 24D2C85A-DD13-4B5D-9CCF-8F3ADC3E6CC7
>> 
>> 6B8CD7AA-11B5-4A0D-8EF1-0D6B18C80A17
>> 
>> 0B7815AE-AC47-457D-B2CA-F0280947220D
>> 
>> there is no significance to these strings other than that the uniqueness of
>> the string being close to infinity i.e. unlikely every to be duplicated
>> again.
>> 
>> This is something brand new for me... I'm curious if anyone knows the
>> patterns here or has any idea of the algorithm being used. It does appear
>> that the alpha chars are always a) caps b) never go beyond F This hints at a
>> hexidecimal system underlying the algorithm.
>> I presume one could request a random selection from the hex set:
>> 0123456789ABCDEF
>> and call this 36 times. i don't know why there is any need for hyphenated
>> segments other than for readability....
>> 
>> But, it's pretty simple to write a generator the appears to emulate the
>> algorithm.. I have this so far and it seems to do the job... any insights?
>> 
>> on mouseUp
>> repeat 5 times
>> repeat 9 times
>>  put GetRandomHex() after  tGUID
>> end repeat
>> put "-" after  tGUID
>> repeat 3 times
>>  repeat 4 times
>>    put GetRandomHex() after  tGUID
>>  end repeat
>>   put "-" after  tGUID
>>   end repeat
>>    repeat 12 times hexSet [tPickAnyOne]
>>  put GetRandomHex() after  tGUID
>> end repeat
>> put tGUID & cr after tOutPut
>> put empty into tGUID
>> end repeat
>> put tOutPut
>> end mouseUp
>> 
>> function GetRandomHex
>>   put "0 1 2 3 4 5 6 7 8 9 A B C D E F" into hexSet
>>     split hexSet by " "
>>     put random(16) into tPickAnyOne
>>    return hexSet [tPickAnyOne]
>> end GetRandomHex
>> 
>> delivers
>> 
>> F2ACEA9EB-C3A5-F4CE-05B5-92888E1E80FA
>> 66A5365D3-EF9A-EF00-66EB-6C82663130B7
>> 65634AD6D-8577-A757-310F-47287CF85389
>> E2A1DC66D-C58C-1F26-26BF-35EA95A46B5C
>> BC04061AC-E3C5-3DEC-6EF3-7397B7757F8A
>> 
>> 
>> Seem OK?
>> 
>> 
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