Component COM in a DLL

Hello, everyone. I'm new here and also beginner in C++.
I need to develop a C++ COM component (DLL) that is accessed by an application developed in delphi5. The component to access a webservice that returns a value, when the DLL receives this value it should send the application delphi5 an event with the value received.
Anybody know how to do this or have any example?
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