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POHow to use CAtlComModule to implement a COM event sink?
 

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  1. POHow to use CAtlComModule to implement a COM event sink?
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    <p>I try to refactor an existing and <strong>working</strong> COM event sink implementation. The event sink class is written in C++ and resides in a DLL that uses the deprecated <a href="http://msdn.microsoft.com/en-us/library/1300df24.aspx" rel="nofollow"><code>CComModule</code></a> class. The goal of the refactoring is to replace <code>CComModule</code> by the new ATL 7.0 class <a href="http://msdn.microsoft.com/en-us/library/4h4fdwzf.aspx" rel="nofollow">CAtlComModule</a>.</p> <p>The existing implementation declares a global variable somewhere in a .cpp file:</p> <pre><code>CComModule _Module; </code></pre> <p>As you can see the variable has the usual "magic" name <code>_Module</code>. The customary initialization is missing, though, nowhere is there a call to <code>CComModule::Init()</code> and there is also no COM object map in the DLL project. The event sink still works, its event handler methods get properly called.</p> <p>Lacking any documentation how to transition from <code>CComModule</code> to <code>CAtlComModule</code>, I naively attempted to change the variable declaration to this:</p> <pre><code>CAtlComModule _Module; </code></pre> <p>It didn't work out, though: After the change the event sink stopped working, i.e. its event handler methods no longer get called.</p> <p>Does anyone know the steps one is supposed to perform to migrate to <code>CAtlComModule</code>? So far I have been unable to dig up a solution either on MSDN or via Google, but maybe I did not look properly...</p> <p>BTW: If necessary I can provide more details about the event sink implementation, but so far I felt that the problem is not in this area.</p>
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    1. COI'd say look heavy at CAtlDllModuleT<T> if this were a class-not-registered flame-out, but your's is just an event sink, which shouldn't even really need registration if in-proc in the traditional sense, so I'm (temporarily at least) stymied as well.
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    2. COWhy are you doing this in first place? You can always create an empty new ATL project and see how modules are defined there.
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    3. CO@RomanR. In the meantime I tried exactly that, but I am not overly pleased with the result. The empty new ATL project does stuff that I don't really want to drag over into my project. It creates a DllMain(), uses a new class that derives from CAtlDllModuleT, dynamically links to ATL but not to MFC. This is all stuff that was not necessary for using CComModule. I will have a closer look at those changes if no one has a simpler solution.
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