ObjectDBX / DWG Thumbnails

Seems the thumbnail drawing preview gets "lost" when using ObjectDBX.
Is this correct or is there a variable or something that I should be
setting??

TIA.

A2K5 on XP Pro

 

This is one of the pitfalls of using ObjectDBX. Tony T. had a solution in
his AcadX, but that has gone by the wayside and is not available for 2005.

 

Thanks Jeff.
That's what I've found in the previous posts. Just wanted to find out if
anyone had anything else.

Do you know anything about purging/auditing using ODBX?? (my post from
yesterday).
Doesn't look like it can be done or is there a "workaround"?


Thanks again!

 

Since there is no graphics editor, it *can't* create one upon saving. Tony's
just preserved the last one that was saved.

 

Makes sense to me.
Thanks.

 

Well the Purge can be done via brute force. Iterate through all drawing
objects (including block defs & dim styles) checking to see if layers,
linetypes, styles, dimstyles, blocks, shapes, etc. are used. If not delete
them........

Or you can check for & catch errors and just try to delete the Table item.
If any objects use the item (layer, ltype, etc) and error will occur,
otherwise it will be 'purged'.You could repeat the loop a number of times to
ensure any nested items are also 'purged'

 

Oh boy!
I think I'll let the users continue to purge their drawings on their own.

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

 

How is it done? Can you show how to save the currently saved thumbnail?

 

I don't know how Tony did it, only that that's what he did. He was using C++
and ObjectArx. It is possible to extract the bitmap using vba if you know
the byte-by-byte structure of the file header. I don't want to go into that
here, but there are some articles on it at www.CadVault.com.

 

If what you want to do is save the current thumbnail when saving using
ObjectDBX (which looses the thumbnail preview)
you could use the ObjectARX function "acdbGetPreviewBitmapFromDwg" to read
the thumbnail from the dwg file
and to save it back you need to use the AcDbDatabase.setThumbnailBitmap
function in Object ARX

The reading of the thumbnail can be done using VBA
but I don't know of any other way of putting back the thumbnail than using
ObjectARX