ACAD [Writing DWG] - Save polygon handle as an xdata for that polygon

 

Autocad wil generate the handles itself (afaik...).

 

 

But on forums for autocad and or python, visualbasi etc. for autocad there are examples of manipulating this.

 

"You can replace an existing entity by a new one with ObjectARX and the handle can be retained using function AcDbObject::handOverTo(). The new entity will have the same handle and AcDbObjectId as the old one."

 

 

and also from autodesk:

 

"The handent function retrieves the name of an entity with a specific handle. As with entity names, handles are unique within a drawing. However, an entity's handle is constant throughout its life. AutoLISP applications that manipulate a specific database can use handent to obtain the current name of an entity they must use. You can use the DDMODIFY command to get the handle of a selected object."

 

 

"In one particular editing session, this code fragment might display the following:

 

 

<Entity name: 60004722>

 

 

In another editing session with the same drawing, the fragment might display an entirely different number. But in both cases the code would be accessing the same entity."

 

 

...so is it usefull to do what u say you want to i wonder.

With fme you can write  autocad data and xtended data too.

 

But this will not nescesarily change or influence the dwg. 

 

Check the fme great readers and writer book dwg section.

 

 

Entity handles cannot be changed or manipulated using fme solely (afaik), as it has to write the file at some time using the dwg writer wich will regenerate it.

 

 

You could do this tho using python using a a pythoncaller (or tcl) , as long as you not use a dwg-writer at the end of the workbench, else it will rewrite it again.

 

 

(i hav'nt done this myself, so you know..)

 

 

 

 

Hi,

 

 

Check this page of the fme dwg Readers and Writers 20214:

 

http://docs.safe.com/fme/html/FME_ReadersWriters/Default.htm#autocad_od/Writer_Directives.htm%3FTocPath%3DFME%20Readers%20and%20Writers%20(formats%20supported%20by%20FME%202014)%7CAutodesk%20AutoCAD%20Map%203D%20Object%20Data%20Reader%2FWriter%7CMapping%20File%20Directives%7C_____2

 

 

Maybe you can control it after all using FME by creating a DEF file for the writer by

 

 

[autocad_od_entity_key_attr autocad_od_entity_key]