Ssget looking inside Blocks

Hi to all,

I have a drawing with a few copy of a block.
The blocks are on layer "BLK"
The block contains lines on layer "A" and "B"

Is it possible to make a selection set (ssget) with the
lines on layer "A" in it, without exploding
all the blocks?

Yves

 

HiHo;
Yes, but it's easier to use the FILTER command and then us P for
previous.

 

SSX will NOT find nested objects (and neither will filter).

 

Hi Yves,

your "copy of a block" in the drawing are not really copies but only
references to th block tabel, call "inserts". So it is not possible to
select single lines of such an insert.
If you want to change something within the bolck you must search the
block definition in the block tabel and change the elements which
build the block. Take a lock to the following code. It searches a
block "test", steps through all elements of this block and changes the
layer of those elements wich are on layer "a" to layer "0"; then
regens the drawing to rebuild all inserts in the drawing.
Feel free to use this code sniplet. Hope it helps you

bob.at

(setq a (tblsearch "BLOCK" "test")) ; gets the block header
(setq b (cdr (assoc -2 a))) ; gets Object name of first element in
block
(while b
(setq be (entget b)) ; gets entity list of element
(if (= (cdr (assoc 8 be)) "a")
(progn
(setq ce (subst (cons 8 "0") (assoc 8 be) be))
(entmod ce)
)
)
(setq b (entnext b))
)
(command "_.regen")

 

No. But if you look at it you may not have asked the question that you think
you did.
What do you want to do, assuming making a selection set is just a means to
another end?

 

No. But if you look at it you may not have asked the question that you think

Ok: I need to detect if there is any line on layer "A".
But of course a block inserted on layer "B" may contain
line on layer "A"... I still not allowed to explode the drawing.

Futhermore, I realised that I have to write this function
in C++ instead of lisp (into an ARX file),
so I'll try to convert Bob`s suggestion to C++.

The new thread name should now be: "Ads_ssget looking into Blocks"...

Thanks!

 

Oops:
Just to be consistent with my previous posts:
"But of course a block inserted on layer "BLK" may contain
line on layer `A`..."