Are there new xref layers in a drawing??

Is there a way to determine if there are any new layers in a drawing (coming
from xrefs) and if so, freeze them?
Microstation has this cool feature which will allow you to essentially set
up a list of "acceptable" layers. If there are any new ones from other
xrefs, they won't display.

I'm not even sure where I'd begin with this one so any help will be greatly
appreciated.

 

Automate the CAD Standards - Layer Manager.
-- Mike
___________________________
Mike Tuersley
CADalyst's CAD Clinic
Rand IMAGINiT Technologies
___________________________
the trick is to realize that there is no spoon...

 

Not sure I completely follow you.
Are you talking about a DWS file?

--
I support two teams: the Red Sox and whoever beats the Yankees.


| Automate the CAD Standards - Layer Manager.
| -- Mike
| ___________________________
| Mike Tuersley
| CADalyst's CAD Clinic
| Rand IMAGINiT Technologies
| ___________________________
| the trick is to realize that there is no spoon...

 

We deal with this with an automation scheme based upon the
OLD layer manager. The scheme saves the desired layer
display state as <a name>+<thefilename> so to produce a
unique layer state name. Then, when there is a file update
(new undesired layers are showing up etc.), we turn off all
layers and then restore the saved layer state. AutoCAD will
restore the display state for only those previously known
layers. All the new layers are not turned on because they
were not present when the layer state was previously
saved.

Since AutoCAD layers by default contain the xref file name,
all the layers in an xref that was previously loaded but now
went through a file name change as part of an update ( to
reflect a revision for example) are "new". To circumvent that
problem we change the xref block name to a static name
since it is the xref block name, not really the file name, that
AutoCAD uses to start the layer name. Now the xref layer
names will always remain the same regardless of any xref
file name change and the layer state restore scheme will
continue to remember the previously known layer names.

All of this process is automated, but not in VBA. I'm not sure
the same can be done with the NEW layer state manager.

 

Is this done every time a drawing is opened?

--
I support two teams: the Red Sox and whoever beats the Yankees.


| We deal with this with an automation scheme based upon the
| OLD layer manager. The scheme saves the desired layer
| display state as <a name>+<thefilename> so to produce a
| unique layer state name. Then, when there is a file update
| (new undesired layers are showing up etc.), we turn off all
| layers and then restore the saved layer state. AutoCAD will
| restore the display state for only those previously known
| layers. All the new layers are not turned on because they
| were not present when the layer state was previously
| saved.
|
| Since AutoCAD layers by default contain the xref file name,
| all the layers in an xref that was previously loaded but now
| went through a file name change as part of an update ( to
| reflect a revision for example) are "new". To circumvent that
| problem we change the xref block name to a static name
| since it is the xref block name, not really the file name, that
| AutoCAD uses to start the layer name. Now the xref layer
| names will always remain the same regardless of any xref
| file name change and the layer state restore scheme will
| continue to remember the previously known layer names.
|
| All of this process is automated, but not in VBA. I'm not sure
| the same can be done with the NEW layer state manager.

 

No. This is not a scheme to detect new layers, nor is it a
scheme intended to automatically reset a file to a particular
display state upon file open. The scheme is used for xref
updates comming from a client that are used in either plotting
files. It is also used for working files. Typically, when used
in working files (files not intended for plotting), a current
display state is saved prior to switching to a temporary
display state with a single button control. The "current"
display state is then restored sometime later with another
single button control.