How to get guid from unknown com object interface (e.g. connection point)?

Question

I've got running service which is available via COM. I can connect with it by using Activator.

I connect COM library

using MyLib;

and then get my object by Instance

Activator.CreateInstance((Type.GetTypeFromProgID("RunningInstance")));

this is actually IConnectionPointContainer

there are several connection points and to get one there is

FindConnectionPoint(SomeGuidHere, out MyConnectionPoint);

if I remember correctly in cpp atl there is just __uuid(IHelloWorld)

the problem is: how to get guide of some "IHelloWorld" interface (connection point) in the Container ?

Community · Accepted Answer · 2017-05-23 12:28:10Z

2

Use EnumConnectionPoints() as described in this answer.

edited May 23, 2017 at 12:28

CommunityBot

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answered Feb 4, 2013 at 10:09

Frank Pfattheicher

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3 Comments

cnd Over a year ago

so... is it a joke? I don't see.

sharptooth Over a year ago

@ℋeatђer: Not a joke, just the link was not properly formatted. Fixed it.

cnd Over a year ago

I see but sadly in example he's getting full list of points and it's some overhead comparing to way when I use an static uuid. But yet I can't find better solution I mark this one as answer.

Brian G · Accepted Answer · 2015-04-15 18:54:17Z

0

If you have a reference to the interface, you can get the GUID from the type.

typeof(IHelloWorld).GUID

answered Apr 15, 2015 at 18:54

Brian G

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1 Comment

Aaron Carter Over a year ago

That doesn't require a reference to the COM interface, just knowing the type name of the wrapper type. If you had a reference to the actual instance you'd need to use GetType(). And if it's a simple object reference you'll be disappointed at the results of it. I'm still trying to figure out if there's any way to find the GUID of a __ComObject (the internal type the runtime holds it in) when all you have is an IUnknown as a System.Object ... really looks like there's no legit way to do it ...

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