topic Re: Opening a drawing/database from memory, instead of a file in ObjectARX Forum

Opening a drawing/database from memory, instead of a file

Anonymous — Tue, 26 Apr 2016 12:51:11 GMT

Hello,

I am working on a plugin that would enable AutoCAD to open my encrypted drawings. I would like to avoid having to decrypt the drawing to a dwg file. However, the APIs for opening a drawing in AutoCAD all seem to work only with filepaths. Is there any other way to load a drawing/database in AutoCAD, that does not involve having a dwg file on the hard drive?

What has caught my attention was the

AcDbDatabase::readDwgFile(AcDwgFileHandle * pDwgFile, ...)

function, but I was unable to find any information on the AcDwgFileHandle class. If it just was a wrapper for Win32 HANDLE or something, it would easily solve my problems. Does anyone know how to obtain the AcDwgFileHandle and whether it would be useful for my purposes?

Thanks for your help.

Have a nice day,

Adam

Re: Opening a drawing/database from memory, instead of a file

artc2 — Tue, 26 Apr 2016 16:16:37 GMT

AcDwgFileHandle is in internal only class, so the class declaration is not available for public use. It only works with files on disk, so it would not be useful to you.

Re: Opening a drawing/database from memory, instead of a file

tbrammer — Mon, 02 May 2016 07:55:26 GMT

Would it help at all if you would be able to decrypt a DWG "transparently"?

What if the user enters QSAVE? Would your drawing be encrypted automatically as well?

How do you manage the encryption?