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Message |
srinivasan
Guest
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 Posted:
Sat Oct 30, 2004 11:37 am Post subject:
Unknown blocks |
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Dear all
when i list a block entity it gives the block name as "*U",but
i dont have a block by that name in the block list.
can anyone suggest what is the idea behind this.
thanks in advance.
Sri
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Ian A. White
Guest
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| Posted:
Sun Oct 31, 2004 1:42 pm Post subject:
Re: Unknown blocks |
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On Sat, 30 Oct 2004 07:37:21 GMT, srinivasan <nospam@address.withheld>
wrote:
| Quote: | Dear all
when i list a block entity it gives the block name as "*U",but
i dont have a block by that name in the block list.
can anyone suggest what is the idea behind this.
thanks in advance.
|
These are anonymous blocks created by an AutoLISP or other similar
routine. Associative dimension blocks start with *D, and earlier
versions used similar anonymous blocks for hatches that started with *X.
Because you cannot "insert" them the normal way, they will not be listed
in the block dialog. You can run the command line version of the block
routine by adding a - in front of it as in -BLOCK. If you enter ? you
will see a listing of blocks in the text screen and the total anonymous
blocks will be listed there.
One reason why anonymous blocks are used is because they are
automatically purged when no longer referenced and the drawing is
opened. |
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srinivasan
Guest
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| Posted:
Fri Nov 05, 2004 10:30 am Post subject:
Re: Unknown blocks |
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Thanks Ian for your information.
The actual problem which i had is i have a drawing
which has lots of entities which when i list gives me the
name as '*u". When i explode the entities and list it gives
me the entity names as line,circle etc.
I think there is some arx in this.
Thanks
Sri
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Ian A. White
Guest
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| Posted:
Fri Nov 05, 2004 3:48 pm Post subject:
Re: Unknown blocks |
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On Fri, 05 Nov 2004 05:30:43 GMT, srinivasan <nospam@address.withheld>
wrote:
| Quote: | Thanks Ian for your information.
The actual problem which i had is i have a drawing
which has lots of entities which when i list gives me the
name as '*u". When i explode the entities and list it gives
me the entity names as line,circle etc.
I think there is some arx in this.
|
When you explode a *U block, you end up with objects like you would
exploding any other block. If you then save and re-open the file, the *U
blocks you have exploded will be purged. One other thing about *U blocks
is that the numbers after *U are not consistent from one session to
another. Essentially AutoCAD assigns numbers to them when the drawing is
opened.
You can create them using AutoLISP using the (entmake) function, or ARX.
Are you trying to do something with them? |
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