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copied!<p>I actually got this working myself using the Unified Event Model. Some notes from my experience in getting it working:</p> <ul> <li><p>You need to initialise ATL otherwise a null pointer error occurs when hooking up events. If you don't want to use ATL in your project (like I didn't - My project is plain C++), something like this in dllmain.cpp works fine (initialises ATL with a dummy module):</p> <pre><code>class CDummyModule : public CAtlDllModuleT<CDummyModule> {}; CDummyModule _Module; </code></pre></li> <li><p>You need to add "embedded_idl" to the end of the #import line.</p> <pre><code>#import "ComponentName.dll" embedded_idl </code></pre></li> <li><p>If the component has any structs embedded in it, you may get some MIDL2025 errors ("expecting a type specification near") due to a bug in Visual Studio (see <a href="https://connect.microsoft.com/VisualStudio/feedback/details/333473/midl2025-migrating-an-attributed-com-project-to-vs-2008-pro-with-exported-structures" rel="nofollow">https://connect.microsoft.com/VisualStudio/feedback/details/333473/midl2025-migrating-an-attributed-com-project-to-vs-2008-pro-with-exported-structures</a> and <a href="http://social.msdn.microsoft.com/forums/en-US/vcgeneral/thread/03b78133-5eac-4754-b9af-fc864a9389a3" rel="nofollow">http://social.msdn.microsoft.com/forums/en-US/vcgeneral/thread/03b78133-5eac-4754-b9af-fc864a9389a3</a>). Solution is to add:</p> <pre><code>[importidl("vsbugfix.idl")]; </code></pre></li> </ul> <p>And then add a</p> <pre><code>typedef struct StructName StructName; </code></pre> <p>For each struct that throws an error</p> <ul> <li><p>Once that's done, you should be able to initialise COM and create an instance of your object. Ugly example code:</p> <pre><code>IComponentName blah; HRESULT hr = CoInitialize(NULL); if (FAILED(hr)) { MessageBox(NULL, "Failed to initialize COM", "Hi!", 0); throw "Failed to initialize COM"; } try { hr = blah.CreateInstance("Something.Something"); if (FAILED(hr)) { CoUninitialize(); MessageBox(NULL, "Failed to initialize the COM library!!", "Hi!", 0); throw "Failed to initialize the COM library"; } } catch (...) { MessageBox(NULL, "Exception occured when initialising library!", "Error", 0); CoUninitialize(); throw "Exception occured when initialising library!"; } </code></pre></li> </ul> <p>Once you have your COM object, you can connect events as per the MSDN "Event Handling in COM" article:</p> <pre><code>__hook(&IComponentNameEvents::OnWhatever, blah, &EventHandlerClass::OnWhatever); </code></pre> <p>Be sure to unhook all events before calling CoUninitialize() otherwise you'll get errors.</p>

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