Obtaining One Object Identifier from Another

Converting between Enames and VLA-objects

Converting Object References

Handling Errors Returned by ActiveX Methods

 

AutoLISP Developer's Guide > Using the Visual LISP Environment > Working with ActiveX > Using Visual LISP Functions with ActiveX Methods > Converting Object References > 

Obtaining One Object Identifier from Another

You may find the same drawing object represented by different identifiers and data types such as a handle string, an ename, a VLA-object, or an ObjectARX object ID integer. To obtain the identifier with the data type your program requires, use the following strategies:

• To find the handle associated with an ename, use the DXF 5 group of the ename's association list:

  _$ (setq handle-circle (cdr (assoc 5 (entget ename-circle))))

  "4F"

• To find the ename associated with a handle, use the handent function:

  _$ (handent handle-circle)

  <Entity name: 27f0538>

• To find the VLA-object associated with a handle, use the vla-handleToObject function:

  _$ (setq vla-circle (vla-handleToObject acadDocument

  handle-circle))

  #<VLA-OBJECT IAcadCircle 03642c24>

• To find the handle associated with a VLA-object, use vla-get-handle to obtain the handle property:

  _$ (vla-get-handle vla-circle)

  "4F"

• To find the ObjectARX object ID of a VLA-object, use vla-get-objectid to get the objectID property:

  _$ (setq objid-Circle (vla-get-objectid vla-circle))

  41878840

• To find the VLA-object identified by an ObjectARX object ID, use the ObjectID-toObject method on the AutoCAD Document object:

  _$ (vla-ObjectIDtoObject acadDocument objid-circle)

  #<VLA-OBJECT IAcadCircle 03642c24>