Topic: How to avoid duplicate in selection?

[HasanCAD]

Hi All

while select blocks using ssget

in some cases, the blocks with the same name selected more than one time.

Code: [Select]

(setq ss (ssget (list (cons 0 "INSERT"))))
(sslength ss)
6
So I am wondering, How to avoid selecting block without douplicate in name?

[Lee Mac]

ssget is obtaining a selection set of entities, independent of any distinct properties they may possess.

To obtain a selection set of block references with distinct block names, you will need to iterate over the set obtained with ssget and remove/ignore block references whose block names have already been encountered in a previous iteration.

[ribarm]

What do you want to do with blocks?
get definition - redefine them...

rename them...
redefine them by import same named block from another drawing...
delete them...

I suppose you don't want to copy them as you have more than you want present in as you satated your selection...

[HasanCAD]

What I want is modify the block nested entities. to be bycolor or bylayer
Today evening I'll try
Thanks in advance

[Lee Mac]

What I want is modify the block nested entities. to be bycolor or bylayer

In that case you'll need to iterate over the block component entities found within the block definition; if you still want the user to select the blocks that are to be modified, I would suggest iterating over the selection and, if the block hasn't previously been encountered, process the block definition and add the block name to a list of processed blocks.

I think there are quite a few examples of this to be found on the forums - for example, this will change the colour of block entities (and nested block entities).

[HasanCAD]

What I want is modify the block nested entities. to be bycolor or bylayer

In that case you'll need to iterate over the block component entities found within the block definition; if you still want the user to select the blocks that are to be modified, I would suggest iterating over the selection and, if the block hasn't previously been encountered, process the block definition and add the block name to a list of processed blocks.

I think there are quite a few examples of this to be found on the forums - for example, this will change the colour of block entities (and nested block entities).

Thanks for great example. It is very good as a start.