OK, someone knows this...

There are some flags set at in a certain variable that can be query'd to
determine what layers a frozen in the current viewport. I cannot for the
life of me remember where they are, but it seems there were some unused
flags in order versions of AutoCAD that got "recruited" for the job,
possibly in the layers table. Can someone please enlighten me?

Thanks.
Bruce L. Sheldon

 

I'll look into this method, but I distinctly remember there are some
assigned bits that are being set and cleared. One should only need to
perform a boolean operation to retrieve the info.

 

Eh? Boolean?

Are we talking about layers that are frozen in viewports
via vplayer (or "Current VP Freeze" in the layer dialog)?

Perhaps it's been too long a day for me, but I don't see
how "assigned bits" would work.

In a given viewport there must be a reference to some
property that identifies each layer that is frozen, be
it the layer's name, handle, entity name, objectid -
something, but mere bits? I invite the education but the
3 brain cells I have that are still holding hands cannot
see how bit twiddling could achieve this.

Turning it around just for completeness of discussion,
magic bits in the layer data would not work for the
reasons noted above, only you'd have to have the means
to identify the viewports the layer was frozen in -
handle, entity name, objectid ...

The only thing I can think that you are possibly referring
to is the dxf data for a given layer. The "Layer is frozen
by default" state is coded in the 70 group (value 2), but
that is no guarantee that it is actually frozen in a given
viewport, so I'm stumped.

Can you please tell me what I'm missing?

Thank you,

Michael.

 

Sure wish I would have saved this procedure way back when. It's nothing
short of incredible that this is so obscure! It's so simple to get the
"global" layer settings and do whatever one wishes, but obtaining the
vplayer settings seems impossible. Where are all the brains in this forum?
Obviously I can't make the claim!

 

Michael *is* one of the brains.

--
R. Robert Bell


Sure wish I would have saved this procedure way back when. It's nothing
short of incredible that this is so obscure! It's so simple to get the
"global" layer settings and do whatever one wishes, but obtaining the
vplayer settings seems impossible. Where are all the brains in this forum?
Obviously I can't make the claim!

 

Umm, Michael gave you the answer. There is no 'magic' place where they hide
together. Each Viewport entity's Xdata holds the names of the layers that
are frozen within it. What is bothersome, though, is that in <2004 the
actual layer <ename> 's were stored with the DXF code 341. With 2004+ they
are in DXF code 331......

So, with some guidance by Doug Broad, I now access the layers strictly
through the Xdata.

What is it you'd like to see/do, as far as the VPlayers go?

Jeff