Test for an XRef

- M
- Mr. B
  
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posted
18 years ago

Mon, Apr 19, 2004 3:50 AM

Does anyone know if you can Test (via Lisp) in a drawing to see if it has an
Xref or not?
I've a program I wrote which opens selected DWG files... I clean them up, etc.
What I want to do is IF the drawing has an Xref (ie a Border in Paperspace),
to set TileMode to 1... if no Xref... leave it as Model Space.
But I can't see how to do this... any thought?
Regards,
Bruce

- B
- bob.at
  
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posted
18 years ago

Mon, Apr 19, 2004 10:30 AM

Step with (tblnext "BLOCK" T) and (tblnext "BLOCK") through the block table an check the value of dxf code 70: if it is >=4 it is some kind of xref.

- P
- Paul Turvill
  
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posted
18 years ago

Mon, Apr 19, 2004 3:10 PM

More correctly, you should do a bitwise evaluation of code 70. If the "4" bit is set, the block is an XRef:
(if (= (logand (cdr (assoc 70 dat)) 4) 4) (alert "This is an XREF") (alert "This is a normal Block") )
Code 70 may be greater than 4, even though the 4 bit is not set; individual bit values currently in use go as high as 64. See the Customization Guide section of HELP. ___

- M
- Mr. B
  
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posted
18 years ago

Tue, Apr 20, 2004 1:22 AM

Thank you Bob...
Bruce

- M
- Mr. B
  
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posted
18 years ago

Tue, Apr 20, 2004 1:22 AM

Thanks for the correction!
Bruce

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