Skip navigation
Rob Cole
Rob Cole
Currently Being Moderated

LrUUID

Feb 8, 2012 1:24 PM

Tags: #lruuid

I've been using the undocumented LrUUID namespace for a while now without any problems, however I just had a user report the error:

 

Could not find namespace: LrUUID

 

He's using Lr3.4 on Vista

 

Anybody know in which version of Lightroom this namespace first appeared?

 

I can't imagine it being an OS thing(?)

 

Thanks,

Rob

884 Views   4 Replies   Latest reply: Rob Cole, May 11, 2012 3:51 PM
 
Replies
  • John R. Ellis
    Currently Being Moderated
    1. John R. Ellis,
    Feb 8, 2012 5:03 PM   in reply to Rob Cole
    Report

    The perils of using undocumented interfaces (of which I'm equally guilty :-<).

     

    Seems unlikely that this would be dependent on the Windows version (i.e. not available in Vista).  The result of LrUUID (on Windows 7) looks like a Windows GUID:

     

    "C57FA964-8A58-4195-9A76-B6002A9633AC"

     

    Windows GUIDs have been around since at least Windows NT 3.5, I think, when Microsoft collaborated on the DCE standard.

     
    |
    Mark as:
  • Rob Cole
    Currently Being Moderated
    2. Rob Cole,
    Feb 8, 2012 6:00 PM   in reply to John R. Ellis
    Report

    Thanks John,

     

    User is upgrading to Lr3.6 now, I'll let you know if it makes a difference.

     

    Rob

     
    |
    Mark as:
  • Matt Dawson
    Currently Being Moderated
    3. Matt Dawson,
    Feb 9, 2012 9:52 PM   in reply to Rob Cole
    Report

    It does seem like an odd error to experience. Namespaces aren't typically

    something that would change across OSes or even within a major release

    cycle. Would have expected that namespace to have been available since at

    least LR3.2 (but more likely LR3.0) so the upgrade shouldn't really be

    necessary. Lets hope the upgrade fixes the problem for your user.

     

    Thanks, Matt

    (Apologies for the brevity - sent from my Android)

     
    |
    Mark as:
  • Rob Cole
    Currently Being Moderated
    4. Rob Cole,
    May 11, 2012 3:51 PM   in reply to Rob Cole
    Report

    My solution:

     

    math.randomseed( LrDate.currentTime() ) -- moved from app constructor.
    local lrUuid = import 'LrUUID'
    if lrUuid ~= nil and lrUuid.generateUUID ~= nil and type( lrUuid.generateUUID ) == 'function' then
        -- good to go
    else
        -- Note: Lightroom uses HEX instead of Base-10, but that's a way to distinguish a "REAL" UUID from one of these PSEUDO UUIDs.
        lrUuid = { generateUUID = function()
            local n1, n2, n3, n4, n5, n6
            n1 = math.random( 10000000, 99999999 ) -- 8-digit random num
            n2 = math.random( 1000, 9999 ) -- 4-digit random num
            n3 = math.random( 1000, 9999 ) -- 4-digit random num
            n4 = math.random( 1000, 9999 ) -- 4-digit random num
            n5 = math.random( 100000, 999999 ) -- 12-digit random num
            n6 = math.random( 000000, 999999 ) -- part 2.
            local pseudoUuid = string.format( "%8u-%4u-%4u-%4u-%6u%06u", n1, n2, n3, n4, n5, n6 )
            return pseudoUuid
        end }
    end
    gbl:initVar( 'LrUUID', lrUuid, reloading ) -- not documented @LR3
     
    |
    Mark as:
Actions

More Like This

  • Retrieving data ...

Bookmarked By (0)

Answers + Points = Status

  • 10 points awarded for Correct Answers
  • 5 points awarded for Helpful Answers
  • 10,000+ points
  • 1,001-10,000 points
  • 501-1,000 points
  • 5-500 points