[IronPython] Problems translating from C#

David Nichols seawolf2913 at gmail.com
Fri Mar 5 04:17:58 CET 2010

Hi Everyone-
I've used Python for a while and I understand the basic concepts of OOP, but
I'm new to .NET and C#.  I'm trying to automate a 3D CAD package called
Alibre so I can generate 300+ assemblies and export them to an industry
standard format. I've been looking through their C# sample code for two days
now and I understand most of it, I can translate a good portion of it,
(IronPython in Action arrived three days ago :), but there is on line in
particular that I can't figure out.

Here's a snippet of the C# example file.  I can post the whole thing if
needed.  //# starts comments I've added in.
using AlibreX
 private void btnBrowse_Click(object sender, EventArgs e)
            IADSession objSession;                //Holds Alibre Session
            IADDesignSession designSession;       //Holds Alibre Design
Session object
            IADPhysicalProperties designProps;    //Holds Physical
Properties object
            OpenFileDialog ofd = new OpenFileDialog();  //# Opens a dialog
box so you can enter the name of an existing part file.
            ofd.Title = "Select File";
            ofd.Filter = "Alibre Part|*.AD_PRT";

            if (ofd.ShowDialog() == DialogResult.OK)
                txtFilePath.Text = ofd.FileName;

                if (rootObj == null)  //# rootObj is the Root Object for
controlling Alibre Design
                    OpenAlibre();  //Call to method which checks to see if
there is running instance of Alibre Design
                                         //# This method, defined further
down in the file, attaches to a running instance of the program, or starts a
new instance.
                                        //# In  either case, rootObj is
created and attached to it.
                objSession = rootObj.OpenFile(txtFilePath.Text);  //#
Creates an instance of IADSession from the rootObj

                if (objSession.SessionType == ADObjectSubType.AD_PART)  //#
As long as the Session is attached to a part...
                    //# THIS IS THE LINE I CAN'T TRANSLATE!!!
                    designSession =
(IADDesignSession)objSession;               //Set Design Session Object to
be the Session you opened
                   //# I think it's creating an instance of IADDesignSession
based on the objSession (see code line below) and I can't figure out how to
do it.
                   //# designSession = objSession obviously leaves me two
references to the same Session Object.
                   //# I've done dir(objSession) and I don't see a method to
create a DesignSession instance.
                   //# Any ideas??

                    designProps =
designSession.PhysicalProperties(ADAccuracySetting.AD_HIGH);    //Set Design
Properties object with the Physical Properties of the Part


Thanks in Advance
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