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    ComponentInstance Guid question

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    • tt_suT Offline
      tt_su
      last edited by

      The GUID is Base64. Are you actually seeing dollar and underscore characters? 😲

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      • sdmitchS Offline
        sdmitch
        last edited by

        @tt_su said:

        The GUID is Base64. Are you actually seeing dollar and underscore characters? 😲

        Apparently so in SU2014. Here is an example from a model of mine.

        @unknownuser said:

        3b1aPlRYjAAwO_o5_Y_sH8
        1ek_9uHFbBkBOk60A4CUTj
        2E9I543eD0KhmvF07odLJe
        1FxdB0eHL9$O3G2kzcXhyB
        2vY$wnUdb3PAiz$HWZGRRK
        372Br$S2v6DeJBakA$Nfg3
        2cAoJTfx1FPv1WkW5OmBeX
        0N5ukFAF96AAR_zp1QMCjB
        20fVk5NOj3DREBJ$kXpy$f

        Nothing is worthless, it can always be used as a bad example.

        http://sdmitch.blogspot.com/

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        • O Offline
          oajfh
          last edited by

          Yes, these are the kind of Guids I get, but I'm using SketchUp 2015. I've only bothered trying with ComponentInstances though. Any particular reason why they seem non-standard Guids ? And are the dollars and underscores the only non alphanumeric symbols ?

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          • tt_suT Offline
            tt_su
            last edited by

            It appear that Base64 character set will depend on implementation. I'm not exactly sure which ones we generate, but I'm asking for more details.

            @oajfh said:

            Any particular reason why they seem non-standard Guids ?

            Which standard are you referring to?

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            • TIGT Offline
              TIG Moderator
              last edited by

              I expect he means something like this:
              1bbf21fa-6616-49a3-aa12-713a5e20370d
              A GUID generator will make them...
              https://www.guidgenerator.com/online-guid-generator.aspx
              http://www.guidgen.com/
              https://msdn.microsoft.com/en-us/library/kw069h38.aspx
              They are all but sure to be unique...

              TIG

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              • tt_suT Offline
                tt_su
                last edited by

                GUIDs doesn't have a standard for formatting though.

                Looking into the GUIDs we return it they are based on the IFC specification which describe compressed GUIDs for file-based exchange: http://www.buildingsmart-tech.org/implementation/get-started/ifc-guid

                Having said that - the API doesn't actually have a contract to which characters it return. It would be safest to not depend on specific delimiter characters and instead use something like JSON or XML to carry the data.

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                • O Offline
                  oajfh
                  last edited by

                  Thanks a lot for the details !

                  I believe that's my original question answered.

                  What exactly do you mean by "the API doesn't actually have a contract to which characters it return" though ? It isn't guaranteed to generate GUIDs containing only those characters from your base ?

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                  • tt_suT Offline
                    tt_su
                    last edited by

                    The API currently call the underlying existing GUID implementation - just pass through the call. I wouldn't expect it to change, should the underlying GUID implementation change for whatever reason, then the characters might be different. Say if the IFC specs changed for instance.

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                    • inteloideI Offline
                      inteloide
                      last edited by

                      Hello there !

                      I take benefit of this post to say that I have an example of one file with 2 components instances from 2 different definitions but with the same GUID.

                      So of course GUID is not unique.

                      My question : is the EntityID unique, but really unique within the same model ?

                      I mean, it may be a random number but the random number is checked to be sure that it's really unique.

                      Best regards.
                      Inteloide

                      Humanity will do a huge step when the IT professionals will understand that computers are tools...

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                      • Dan RathbunD Offline
                        Dan Rathbun
                        last edited by

                        They are supposed to be unique. If you can, can you send Thomas (tt_su) the file by PM so he can take a look ?

                        I'm not here much anymore.

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                        • thomthomT Offline
                          thomthom
                          last edited by

                          EntityID are unique for the model - but entities will be assigned a new ID each time you open it. They are not persistent. There will not be two entities with the same entityID in a model.

                          ComponentDefinition GUIDs change as you modify the definition.

                          ComponentInstance GUIDs persist - even if you edit the instance/definition.

                          Thomas Thomassen β€” SketchUp Monkey & Coding addict
                          List of my plugins and link to the CookieWare fund

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