COM event client using #import

Does anyone know of a sample showing use (sinking?) of an event by a client using #import but not ATL?

I have tried to search, but unfortunately search engines don't recognize the # in #import. Also I don't know how to navigate the articles in this web site to find the relevant articles and as I said searching does not help. I find samples that don't use #import and I find samples that use ATL and/or MFC, but as I recall MFC does not help much for COM stuff that it does not have support for in the MFC libraries.

Yes, it has been a few years since I was in these forums. I was the first to get 10,000 posts, nearly all attempts to help others. I hope I can get some guidance now.

This article covers the basics using only built-in compiler COM support stuff: http://www.codeproject.com/KB/COM/TEventHandler.aspx

Should at least give you better search terms to use :)

gg

Attached please find the sample of handling COM events. The sample includes a trivial COM server which fires event back on calling COM method. The client uses no ATL features for implementing event sink, just regular COM smartpointers.

Please also take into account, the sample does not provide complete error handling for the sake of code simplicity. And in a real project every _ASSERT(SUCCEEDED(hr)) has to be turned to if (SUCCEEDED/FAILED(hr)) clause.

Code:

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int _tmain(int argc, _TCHAR* argv[])
{
        CTestEventImpl sink;
        ITestPtr ptest;
        HRESULT hr = ptest.CreateInstance(__uuidof(Test));
        if (SUCCEEDED(hr))
        {
                // find connection point
                IConnectionPointPtr pcp;
                IConnectionPointContainerPtr pcpc;       
                hr = ptest->QueryInterface(IID_IConnectionPointContainer, (void**)&pcpc);
                _ASSERT(SUCCEEDED(hr));
                hr = pcpc->FindConnectionPoint(__uuidof(_ITestEvent), &pcp);
                _ASSERT(SUCCEEDED(hr));

                // attach event sink
                DWORD cookie;       
                hr = pcp->Advise(&sink, &cookie);
                _ASSERT(SUCCEEDED(hr));

                // call method
                hr = ptest->Test1(_bstr_t("Hello COM Events World!\n"));
                _ASSERT(SUCCEEDED(hr));

                // clean up
                hr = pcp->Unadvise(cookie);
                _ASSERT(SUCCEEDED(hr));
        }

        return 0;
}

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