Interop problem while implementing "Observer" pattern

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CAra - 24 Oct 2005 10:22 GMT

Hi All,

I have a problem with interop as explained below:

I have a component build in VC++ 6.0.

I have built another component in C#. These two components follow
"Observer" pattern where VC++ component acts as the subject and C#
component acts the observer.

As C# is the observer, it has to "Register" with C++ and has to give
it's own custom call back interface pointer (not IUnknown)

All is well, till the C++ makes a call on the call back interface
pointer. When the C++ tries to call the call back method, it just gets
blocked there. I don't understand what is happening there.

Could some explain it>?

Thanks in advance

Regards
CAra

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CAra - 24 Oct 2005 13:02 GMT

Hello all,

now it is working! But I still don't know why it is working...

I have done the following changes:

I have added "ComVisibleAttribute" and set its value to "true" for
those call back methods and tested. It worked fine.

After this, I have removed that attribute and tested again. This time
also it worked. I am somewhat happy though I don't know wthaz
happening....

Regards
CAra

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Interop problem while implementing "Observer" pattern

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