If I launch multiple Inventor instances myself, how can I tell which instance owns which document?

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If the fx parameter is derived from another editable parameter, you can:

• Use VBA to change the base parameter.
• The fx parameter will update automatically.

Dim oPartDoc As PartDocument
Set oPartDoc = ThisApplication.ActiveDocument

Dim oParams As Parameters
Set oParams = oPartDoc.ComponentDefinition.Parameters

oParams.Item(\"BaseLength\").Value = 10 ' This affects fx parameters that depend on BaseLength

Yes, Nishan-it is possible to build an Inventor assembly file (.iam) offline, without launching the Inventor UI, using the ApprenticeServer API.

You can prepare a blank .iam template and use Apprentice to:

1. Open the template
2. Insert existing .ipt files as component occurrences
3. Save the modified .iam

Here’s a simplified VB.NET snippet using Apprentice:

Dim apprenticeApp As New Inventor.ApprenticeServerComponent
Dim asmDoc As ApprenticeServerDocument = apprenticeApp.Open("C:\Templates\BlankAssembly.iam")

Dim partDoc As ApprenticeServerDocument = apprenticeApp.Open("C:\Parts\MyPart.ipt")
Dim asmCompDef As ApprenticeComponentDefinition = asmDoc.ComponentDefinition

' This part is tricky — Apprentice does not expose AddOccurrence directly
' You'd need Inventor API for precise placement and constraints

asmDoc.SaveAs("C:\Assemblies\BuiltOffline.iam", False)

If your application partly uses Apprentice, and it's run on a computer without Apprentice installed, here's what will happen:

• COM instantiation will fail: When your code tries to create New ApprenticeServerComponent(), it will throw a COM exception like System.Runtime.InteropServices.COMException or Class not registered.
• Dependent features will break: Any functionality relying on opening .ipt, .iam, or accessing iProperties, BOM, etc., will fail.
• Silent failure or crash: If not handled properly, the app may crash or behave unpredictably.

How to Avoid Problems

Check for Apprentice Availability at Runtime

Use a safe instantiation pattern:

Dim apprenticeAvailable As Boolean = False
Try
    Dim appServer As New Inventor.ApprenticeServerComponent()
    apprenticeAvailable = True
Catch ex As Exception
    apprenticeAvailable = False
    ' Log or notify user: Apprentice not installed
End Try

Then conditionally enable or disable features:

If apprenticeAvailable Then
    ' Proceed with Apprentice-dependent logic
Else
    ' Disable buttons, show message, or fallback
End If

Here’s how to make it work more reliably:

1. Initialize Apprentice Properly

   Make sure Apprentice is initialized before loading the control:

   
   Dim appServer As Inventor.ApprenticeServerComponent = New Inventor.ApprenticeServerComponent()
           

2. Use Static Viewing Instead of Interactive Tools

   Avoid using toolbar buttons like Rotate or Zoom directly. Instead, control the view programmatically:

   
   Dim viewCtrl As InventorViewControl = Me.InventorViewControl1
   viewCtrl.ViewOrientation = Inventor.ViewOrientationEnum.kIsoTopRightView
   viewCtrl.Fit()
           

3. Disable Toolbar or Customize It

   If Rotate causes crashes, disable or hide it:

   
   viewCtrl.ToolbarVisible = False
           

   Or selectively enable safe tools:

   
   viewCtrl.ToolbarVisible = True
   viewCtrl.EnableZoom = True
   viewCtrl.EnablePan = True
   viewCtrl.EnableRotate = False ' Disable problematic tool
           

4. Use Try-Catch Around View Manipulation

   Protect your code from runtime exceptions:

   
   Try
       viewCtrl.RotateView(30, 0) ' Example: rotate 30 degrees around X
   Catch ex As Exception
       MessageBox.Show("Rotate failed: " & ex.Message)
   End Try
           

5. Ensure Graphics Compatibility

   Make sure your system supports DirectX 11 and your form has proper DPI and scaling settings. Some crashes stem from graphics context mismatches.