COM and interface

[Ondrej]

Hi everybody,

I am starting with C#. I have COM object, which sometimes exposes
IEnumTerminal interface and sometimes it doesn't, because exsistence of this
interface depends on the other factors.

My question is, how may I find out with IAddress interface (interface of my
COM object), whether my COM object exposes the IEnumTerminal interface?

I know, how to do it in other programming languages (using
IAddress->QueryInterface), but I have problem to do it in C#.

Thanks you a lot

Ondrej

[Willy Denoyette [MVP]]

Using a cast will QI under the covers:

IEnumTerminal enumTerm = IAddress as IEnumTerminal ;
if(enumTerm != null)
{
// OK QI succeeded
// do someting with it
}
else
// QI for IEnumTerminal failed

Willy.
PS. please post interop questions to the interop NG -
microsoft.public.dotnet.framework.interop.

"Ondrej" <ie**@ynet.sk> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi everybody,

I am starting with C#. I have COM object, which sometimes exposes
IEnumTerminal interface and sometimes it doesn't, because exsistence of
this interface depends on the other factors.

My question is, how may I find out with IAddress interface (interface of
my COM object), whether my COM object exposes the IEnumTerminal interface?

I know, how to do it in other programming languages (using
IAddress->QueryInterface), but I have problem to do it in C#.

Thanks you a lot

Ondrej

[Ondrej]

Willy, thanks very much.

Ondrej

"Willy Denoyette [MVP]" <wi*************@pandora.be> napísal v správe
news:%2****************@TK2MSFTNGP12.phx.gbl...

Using a cast will QI under the covers:

IEnumTerminal enumTerm = IAddress as IEnumTerminal ;
if(enumTerm != null)
{
// OK QI succeeded
// do someting with it
}
else
// QI for IEnumTerminal failed

Willy.
PS. please post interop questions to the interop NG -
microsoft.public.dotnet.framework.interop.

"Ondrej" <ie**@ynet.sk> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...

Hi everybody,

I am starting with C#. I have COM object, which sometimes exposes
IEnumTerminal interface and sometimes it doesn't, because exsistence of
this interface depends on the other factors.

My question is, how may I find out with IAddress interface (interface of
my COM object), whether my COM object exposes the IEnumTerminal
interface?

I know, how to do it in other programming languages (using
IAddress->QueryInterface), but I have problem to do it in C#.

Thanks you a lot

Ondrej