Category Archives: COM
What Exactly Are ATL’s BEGIN_COM_MAP, END_COM_MAP, and COM_INTERFACE_ENTRY Macros?
There are many places where ATL’s COM_MAP macros are documented, but I haven’t seen it plainly stated what they actually mean. Simply put, BEGIN_COM_MAP implements _InternalQueryInterface. COM_INTERFACE_ENTRY indicates that your class supports the specified interface. END_COM_MAP finishes the _InternalQueryInterface implementation. … Continue reading
Posted in C++, COM, Technology, Windows
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The Demise of CAPICOM
CAPICOM, a COM-based wrapper for the CryptoAPI library, is deprecated and on its way out. However, Microsoft has no time line for phasing it out, nor have they provided sufficient documentation of alternatives. Many CAPICOM pages contain a confusing, bright-red … Continue reading
Posted in Authenticode, COM, Cryptography, Technology, Win32
Tagged Authenticode, CAPICOM, code signing
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CoCreateInstance Fails With “Class Not Registered”
Recently, I had a problem unique to my test machine. Attempting to call CoCreateInstance on a COM class provided by one of our DLLs resulted in HRESULT 0x80040154, which corresponds to “Class not registered”. This was a mystery since regsvr32 … Continue reading
Posted in COM, Technology, Win32, Windows
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