![]() ![]() To the best of my knowledge the applications that mistakenly caused this problem have now been fixed (and shall remain nameless), but there are still drawings out there with a lot of these records, which is ultimately why we extended PURGE to address the problem from within AutoCAD.Īnyway, I've chosen to implement a command to purge these RegApp names - even though it's now there in the product - really just an example of how to code this type of functionality. A few applications have, in the past, created many more names than they required, and as these RegApp names get copied from drawing to drawing (when they get XRefed, for instance), they ended spreading from DWG file to DWG file (one comparison I remember hearing was to a virus, although that was perhaps a little extreme). Applications that make use of Extended Entity Data (XData) must register unique application names in drawings. Since AutoCAD 2005 (if I recall correctly), PURGE also supports the removal of Registered Application names. The PURGE command in AutoCAD allows you to safely purge these non-graphical objects (layers, linetypes, block definitions, etc.). Purging can seriously reduce the size of AutoCAD drawings by removing unnecessary symbol table and dictionary entries.
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