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Editorial Team
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Asked: 2026-06-01T12:53:09+00:00

I am looking into DirectShow samples from Windows SDK. Many of the classes feature

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I am looking into DirectShow samples from Windows SDK. Many of the classes feature non-default constructor. How those constructors are called? Who supplies arguments?

Can I use those classes in C++ programs without registration? If so I could use class constructor directly.

If I use a COM class without registration what happens in the following code fragment:

Foo * foo = new Foo(.....); // note, not using CoCreateInstance
Bar * bar = foo->QueryInterface(...);
bar->Release();
delete foo; // CRASH?

Thank you!

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1 Answer

  1. Editorial Team

    It has nothing to do with COM, it is just the framework is built this way and constructor arguments in DirectShow BaseClasses are necessary to get everything together – the class, the ancestor, the instantiating factory.

    Using COM class without registration might be or might not be possible. I suspect you might be interested in using DirectShow filter without registration instead, and there is a good article on the topic: Using Filters Without Registration.

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