topic Re: System Variables in .NET Forum

System Variables

sanganaksakha — Mon, 28 Feb 2011 13:23:43 GMT

I am sudying the sample code in the 'AutoCAD .NET Developer's Guide'.

'CVPORT' is a system variable. It is called as follows:

Application.GetSystemVariable("CVPORT")

'TileMode' is another system variable which is called as follows:

Application.DocumentManager.MdiActiveDocument.Database.TileMode

Can somebody explain me the difference between the two methods of accessing the system variable?

Also, the logic about which method can be used with which system variable because I found that

Application.DocumentManager.MdiActiveDocument.Database.Cvport

does not seem to work.

Re: System Variables

Anonymous — Mon, 28 Feb 2011 13:38:21 GMT

Hi,

the diffrent between tilemode and cvport is, that the cvport is an object and tilemode only an integer value.

use this:

Document doc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;

Database db = doc.Database;

CurrentViewportTableRecordId cvId = db.CurrentViewportTableRecordId;

Transaction tr = db.TransactionManager.StartTransaction();

using (tr)

{

//The following code gets the current viewport as an object.

ViewportTableRecord cv = (ViewportTableRecord)tr.GetObject(cvId, OpenMode.ForRead);

}

I think thats works, but it is not tested.

Jürgen