Selection set from list

[Accoes]

I'm trying to get a selection set from a list.The selection I would like is assoc 301 from this.I have a start I think,but no go.

(setq aa (entget "x" '((0 . "MAPS_SOLID" (301 . "on")))

 
Select object: ((-1 . <Entity name: 7ffff808470>) (0 . "MAPS_SOLID") (330 . 
<Entity name: 7ffff803e50>) (5 . "607") (100 . "AcDbEntity") (67 . 0) (410 . 
"Model") (8 . "M-SALP-GVDU-REC") (8 . "M-SALP-GVDU-REC") (300 . "TRANS HOLE") 
(300 . "None") (300 . "Not Set") (300 . "Galvanized") (300 . "24") (300 . "24") 
(300 . "24 (inch)") (300 . "0") (300 . "") (300 . "") (306 . "On") (305 . "On") 
(301 . "On"))

[Lee Mac]

Look into the ssget function.

[Accoes]

(ssget "x" '((0 . "MAPS_SOLID" )(301 . "on")))

I had tried that before.Will keep looking

[Lee Mac]

That should be correct - providing you have the correct data in the Filter list.

[Accoes]

That second code field up top was a (entget(car(entsel))).It's returning nil and not highlighting the object

This will create the selection but not filter enough
(sssetfirst nil (ssget "_X" '((0 . "MAPS_SOLID"))))

This for some reason will not
(sssetfirst nil (ssget "_X" '((0 . "MAPS_SOLID")(301."on"))))

[Lee Mac]

How about this?

(sssetfirst nil (ssget "_X" '((0 . "MAPS_SOLID")(301 . "On"))))

[Accoes]

Bingo....That space was causing the headache.

Thanks for the help.I have another question and tried to look it up but could not figure away to put it in a search.The apostrophe after the "_x".What does that tell
it?

[Lee Mac]

Explanation of the Apostrophe:

http://www.cadtutor.net/forum/showpost.php?p=258390&postcount=20

[Accoes]

Just to clarify,it was not a space but a lower case string.

[Accoes]

In the first post in the second code section ,I would like to filter with one of the associate 300 series.Is it posible to choose one when there are several or do you have to parse them out?