how to convert a VLA-OBJECT(lisp) into a VB object?

[Anonymous]

hi, everyone!

I have gotten an acad object by calling (vlax-get-acad-object) in an
AutoLisp program, now how could i convert it into a VB object and transfer
it to a vb function?

thx!

[dgorsman]

Probably easiest is to pass the objects handle - just a string value, stable constant reference.

[Anonymous]

thank you.
but for the application(AutoCAD), the handle is nil, and it has a HWND, and
how could i convert a HWND into the AutoCAD.Application object?

дÈëÏûÏ¢ÐÂÎÅ:5651182@discussion.autodesk.com...
Probably easiest is to pass the objects handle - just a string value, stable
constant reference.

[jbooth]

I am not familiar with lisp entities, but I would expect that you can pass the objectID to your VBA program and use the AcadDocument.ObjectIDtoObject() method.

I have been able to use the above method to get an ARX entity via COM. Don't ask why though; I'm not doing it any more 🙂

[kpblc2000]

I think it means ThisDrawing.Application and nothing more.

[jbooth]

Let me clarify my previous post.

Every autocad entity has an ObjectID property, which is used as a pointer to the object's information. This property can be converted to a vaue of datatype "long" (if it isn't already a long). You can then use this reference number to get the object via COM interop (ie: VBA) by using the command:

ThisDrawing.ObjectIDToObject(byval OldID as long)

This should work every time unless:
1. The referenced object is recently erased (and has the property: IsErased = True).
2. The entity does not belong to the active drawing (it belogs to another drawing in your application).

I don't know offhand if VLA-OBJECT will return erased entities, so I can't say for sure if you need to check for it or not.

JB

[dgorsman]

Surely there is a better way to do this? You are referencing a running session of AutoCAD from an external VB application, right? Why not check for running instances of AutoCAD using the application and simply assign it to an object variable without running through LISP?

[Anonymous]

Thanks.

But the OBJECT I'm interested in is the AutoCAD.Application, it dose not
have an objectID or a handle.

дÈëÏûÏ¢ÐÂÎÅ:5652708@discussion.autodesk.com...
I am not familiar with lisp entities, but I would expect that you can pass
the objectID to your VBA program and use the AcadDocument.ObjectIDtoObject()
method.

I have been able to use the above method to get an ARX entity via COM. Don't
ask why though; I'm not doing it any more 🙂

[Anonymous]

You means GetObject()?

What I warried about is that I'm not sure that this function can give me the
object which exactly I want, for example, if there are several sessions of
AutoCAD.
дÈëÏûÏ¢ÐÂÎÅ:5653233@discussion.autodesk.com...
Surely there is a better way to do this? You are referencing a running
session of AutoCAD from an external VB application, right? Why not check
for running instances of AutoCAD using the application and simply assign it
to an object variable without running through LISP?

[Anonymous]

My function is inside a dll, not dvb.
Thank u
дÈëÏûÏ¢ÐÂÎÅ:5652755@discussion.autodesk.com...
I think it means ThisDrawing.Application and nothing more.

[Anonymous]

Thank u.
It works for database-resident object, but I'm interested in the
AutoCAD.Application Object.
дÈëÏûÏ¢ÐÂÎÅ:5652836@discussion.autodesk.com...
Let me clarify my previous post.

Every autocad entity has an ObjectID property, which is used as a pointer to
the object's information. This property can be converted to a vaue of
datatype "long" (if it isn't already a long). You can then use this
reference number to get the object via COM interop (ie: VBA) by using the
command:

ThisDrawing.ObjectIDToObject(byval OldID as long)

This should work every time unless:
1. The referenced object is recently erased (and has the property: IsErased
= True).
2. The entity does not belong to the active drawing (it belogs to another
drawing in your application).

I don't know offhand if VLA-OBJECT will return erased entities, so I can't
say for sure if you need to check for it or not.

JB

[jbooth]

GetObject() will only return the first instance it finds.

You can use the hwnd of the AutoCAD application, but you will need to import some windows API functions in order to get the exact application window you are looking for.

It's much more complicated than you would think.

[dgorsman]

That shouldn't be a serious problem; I'm hard pressed to find a situation where more than one session of AutoCAD would (or even should) be running. If necessary, it can just be a program limitation.

[Anonymous]

Haven't LDT have you? It is still a 'one document per session' application
and I often have more than one (up to 3) sessions running at the same time.

wrote in message news:5654055@discussion.autodesk.com...
That shouldn't be a serious problem; I'm hard pressed to find a situation
where more than one session of AutoCAD would (or even should) be running.
If necessary, it can just be a program limitation.

[Anonymous]

thank u.
дÈëÏûÏ¢ÐÂÎÅ:5653919@discussion.autodesk.com...
GetObject() will only return the first instance it finds.

You can use the hwnd of the AutoCAD application, but you will need to import
some windows API functions in order to get the exact application window you
are looking for.

It's much more complicated than you would think.

[dgorsman]

*shudder*

[Anonymous]

🙂
thank you a lot.
дÈëÏûÏ¢ÐÂÎÅ:5654475@discussion.autodesk.com...
*shudder*