Lisp update specific block attribute in drawing

[Anonymous]

Hello,

I have created a list of blocks for my drawing and I have created a draw with my blocks and connected them with lines/polylines. Now I need to make a lisp program to update specific blocks in the draw and add some more attributes to them. So the question is how do I loop in all blocks inside the draw and update a specific attribute to them? I have found how to loop on the blocks but these were the blocks of my toolbar while I need to find their entities inside the draw and there to update their attributes.

Thanks

[ВeekeeCZ]

A list of what? block names, enames, vla-objects?? 

Since you have a list already, so just use...

(foreach b lst (command "_.attsync" "_n/s" b...))

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[Anonymous]

I have a list of the 20 block I have on my file. When I add them multiple times inside the drawing I need this larger list of them inside the drawing and there to update one attribute. 

With this:

(setq adoc (vla-get-activedocument (vlax-get-acad-object)))
(vlax-for blk (vla-get-blocks adoc)

I get the list of block. But I don't need this list but the list of blocked that have been added to the drawing. If I understand correctly I need the vla-objects but from a specific block.

[ВeekeeCZ]

It's a bit complicated for me to follow you. Try to use terms like block-definition and block-reference. Do you understand the difference between them? That's essential.

Also if you change your block (-definition), then use the ATTSYNC command (in AutoCAD) to update selected blocks(-references), will this work for you as you need?

[Anonymous]

Let me describe it differently. I have a drawing consisting of blocks that are connected with lines & poly-lines. In the attached screenshot I have marked these blocks with a black arrow. So in this drawing with this command I can get the 3 line objects:

(setq linespoly (ssget "_X" '((0 . "Line,Lwpolyline"))))

I would like to do something similar for the instances of blocks of this drawing which are about 13. These 13 elements have been inserted there by selecting 2 specific blocks from the block list on my toolbar.

[ВeekeeCZ]

Use terms like block-definition and block-reference. Do you understand the difference between them? That's essential.

Also if you change your block (-definition), then use the ATTSYNC command (in AutoCAD) to update selected blocks(-references), will this work for you as you need?

[Sea-Haven]

You can multiple filter ssget is that what you mean ?

(ssget (List (cons 0 "INSERT")(cons 2 blkname)))