topic Cannot create an instance of AppRef in ArcObjects SDK Questions

Cannot create an instance of AppRef

MichaelEber — Mon, 11 Aug 2014 23:19:21 GMT

I am having an issue with our cost distance raster. I tried using our methods that worked in 10.0 to add these to the table of contents on the map to see the values returned. However when I all either

IApplication baseApp = (IApplication)Activator.CreateInstance(Type.GetTypeFromCLSID(new Guid("E1740EC5-9513-11D2-A2DF-0000F8774FB5")));

or I call

IApplication baseApp = (IAplication)Activator.CreateInstance(Type.GetTypeFromProgID("esriFramework.AppRef"));

I get the same error returned :

Process Failed: System.Runime.InteropServices.COMException.....IClassFactory Failed due to error 8000ffff

I've seen discussions on Stack Overflow that you have to be inside an Arcmap enviroment....however I AM inside an Arcmap environment.

Is there a new way to do this inside 10.2.2 that these........developers didn't share with us???

Re: Cannot create an instance of AppRef

ErinBrimhall — Tue, 12 Aug 2014 22:02:37 GMT

I don't believe you should be creating an instance of an IApplication; you should be getting a hook to an existing instance (that represents ArcMap itself).

Is your code inside of a custom ArcMap extension? If so, there should be an automatically generated ArcMap static class that exposes an Application property. Assuming this is true, the following code would work:

IApplicaiton baseApp = ArcMap.Application;

Re: Cannot create an instance of AppRef

MichaelEber — Tue, 12 Aug 2014 22:08:14 GMT

Activator.CreateInstance is how you get a hook into the singleton. I'm running a geoprocessing service as a tool inside Arcmap and as I said before I have done this without issues in ArcMap 10.0. It is now broken in 10.2.2

Re: Cannot create an instance of AppRef

ErinBrimhall — Tue, 12 Aug 2014 22:48:55 GMT

I follow you now.

There are a few variations on the code used to obtain a reference to the IApplication singleton, but nothing fundamentally different.

I am running 10.2.1 and both approaches work for getting a hook to the IApplication. Besides the ArcDesktop version difference, this code is running from an Add-In as opposed to a Tool.

Does your custom tool implement the ITool interface, or is it derived from BaseTool?

Re: Cannot create an instance of AppRef

MichaelEber — Wed, 13 Aug 2014 18:53:55 GMT

We implement our code using IGPFunction2 interface and the IGPFunctionFactory for exposing them to Arcmap.

Re: Cannot create an instance of AppRef

ErinBrimhall — Thu, 14 Aug 2014 20:01:26 GMT

One last idea: have you tried using the IAppROT (running object table) interface from the GP tool to get a hook to ArcMap? Lack of #CODE formatting in the new forums is a bummer, but here is an example of AppROT usage:

IAppROT appRot = new AppROTClass();

for (int i = 0; i < appRot.Count; i++)

{

if (appRot.Item.Name == "ArcMap")

{

IApplication arcMapApplication = appRotItem.Item as IApplication;

}

Re: Cannot create an instance of AppRef

MichaelEber — Thu, 14 Aug 2014 21:39:42 GMT

Wow! That worked! Nice of ESRi to force us to search for ways to get around their coding screwups.

Like I had nothing better to do.

BTW : Here is the code I implemented -- a bit different from what you did.

IAppROT appRot = new AppROTClass();

IApplication baseApp = null;

for (int index = 0; index< appRot.Count; index++)

{

if (appRot.get_Item(index) is ESRI.ArcGIS.Framework.AppRef)

baseApp = (IApplication)appRot.get_Item(index);

}

Thanks, Erin

Re: Cannot create an instance of AppRef

ErinBrimhall — Thu, 14 Aug 2014 21:54:58 GMT

Nice! I'm happy this worked for you.