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Mentor
Amremad
Posts: 217
Registered: ‎08-24-2010
Message 1 of 4 (276 Views)

different Between Database definitions

276 Views, 3 Replies
04-22-2013 03:17 AM

what's the different between

 

 Dim oDb As Database = HostApplicationServices.WorkingDatabase

 and

 

Dim oDb As Database = Application.DocumentManager.MdiActiveDocument.Database

and

Dim oDb As Database = Application.DocumentManager.MdiActiveDocument.Editor.Document.Database

 

Valued Mentor
DiningPhilosopher
Posts: 370
Registered: ‎05-06-2012
Message 2 of 4 (253 Views)

Re: different Between Database definitions

04-22-2013 06:26 AM in reply to: Amremad

In AutoCAD they return the same value.

 

HostApplicationServices is a way to access certain functions in non-AutoCAD host applications (e.g,. RealDWG), where there is no Document object.

Mentor
khoa.ho
Posts: 224
Registered: ‎09-15-2011
Message 3 of 4 (242 Views)

Re: different Between Database definitions

04-22-2013 07:17 AM in reply to: Amremad

Autodesk.AutoCAD.ApplicationServices.Application is a class from assembly acmgd.dll which references acdbmgd.dll

 

Autodesk.AutoCAD.DatabaseServices.HostApplicationServices is a class from acdbmgd.dll

 

Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase is the active working database of the single-threaded RealDWG process, which is an engine of AutoCAD without UI.

 

In AutoCAD, Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase is a pointer of Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Database. So every time you change the active drawing on AutoCAD, it will set MdiActiveDocument.Database to WorkingDatabase. There are many MdiActiveDocument.Databases in DocumentManager, but there is only one WorkingDatabase which is a worker of MdiActiveDocument.Database.

 

In short, all AutoCAD database tasks are based on RealDWG engine, MdiActiveDocument.Database is an upper layer of WorkingDatabase.

 

You also see the another answer at the link.

 

-Khoa

www.netscriptcad.com

 

Mentor
khoa.ho
Posts: 224
Registered: ‎09-15-2011
Message 4 of 4 (235 Views)

Re: different Between Database definitions

04-22-2013 07:31 AM in reply to: Amremad

In short, in AutoCAD:
Application.DocumentManager.MdiActiveDocument.Database calls HostApplicationServices.WorkingDatabase to execute the drawing database job.

MdiActiveDocument.Editor.Document = MdiActiveDocument so MdiActiveDocument.Editor.Document.Database = MdiActiveDocument.Database

In RealDWG, there is only HostApplicationServices.WorkingDatabase

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