Com Interop Question, Typing and Instantiating objects

[tgreer]

I'm working with C#, and Adobe Acrobat 6.0 Professional. Acrobat exposes a COM Automation server with a few top-level objects. It's easy enough to create instances of those objects, by getting their Type via the .GetTypeFromProgID() method, and then using Activator.CreateInstance().

// Create an Acrobat Application
object Type AcrobatAppType;
AcrobatAppType = Type.GetTypeFromProgID("AcroExch.App");
Acrobat.CAcroApp oAdobeApp = (Acrobat.CAcroApp)Activator.CreateInstance(AcrobatAppType);

// Create an Acrobat Document object
Type AcrobatPDDocType; 
AcrobatPDDocType = Type.GetTypeFromProgID("AcroExch.PDDoc");
Acrobat.CAcroPDDoc oAdobePDDoc = (Acrobat.CAcroPDDoc)Activator.CreateInstance(AcrobatPDDocType);

// Create an Acrobat AV Document object
Type AcrobatAvType;
AcrobatAvType = Type.GetTypeFromProgID("AcroExch.AVDoc"); 
Acrobat.CAcroAVDoc oAdobeAVDoc = (Acrobat.CAcroAVDoc)Activator.CreateInstance(AcrobatAvType);

However, there are other objects that can only be created by calling a method of one of these top-level objects. For example, Acrobat's built-in JavaScript engine can be returned via the "GetJSObject()" method of the PDDoc object.

This code, for example, compiles and runs:

object oAcrobatJSobj = oAdobePDDoc.GetJSObject();

However, since this object isn't strongly typed, it isn't really useful. I can't call any of its inherent methods or properties.

How can you type and instantiate such an object?

Thomas D. Greer

http://www.tgreer.com

 

[tgreer]

Bump. Not a single reply? How would you isntantiate an object generated by a COM "bridging" method?

Thomas D. Greer

http://www.tgreer.com

 

[B00gyeMan]

Errrr.... use reflection? I.e. Type.InvokeMember