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.NET Forum / .NET Framework / Interop / September 2003

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getting back an HREF, iUnknown, in vb.net

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Jerry J - 15 Sep 2003 22:53 GMT
Hi,

I am using VB.net to talk to a COM object. I have two
problems I am trying to solve.

1)  One of the COM public methods returns the standard
S_OK if all is well. It looks like this:

STDMETHODIMP CPalMsgRouter::IsStarted(void)
{

  if(m_pPmc == 0) {
        return S_FALSE;
    }
    else {
        return S_OK;
    }
}

I have a reference to the object declared like this:
Private oRef As New MyLib.MyClass()

When I use oRef to access 'IsStarted', how do I get the
return value?  Vb thinks there is no return value?

2) How can I use the oRef to get an IUnknownPointer ?

Thanks for any help you can provide.

Jerry J
Mattias Sj?gren - 15 Sep 2003 23:03 GMT
Jerry,

>When I use oRef to access 'IsStarted', how do I get the
>return value?  Vb thinks there is no return value?

See the section "Preserve Signature" at

http://msdn.microsoft.com/library/en-us/cpguide/html/cpconeditinginteropassembly.asp

>2) How can I use the oRef to get an IUnknownPointer ?

Marshal.GetIUnknownForObject()

Mattias

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Mattias Sjögren [MVP]  mattias @ mvps.org
http://www.msjogren.net/dotnet/
Please reply only to the newsgroup.


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