You may receive an error message when you call the AtlAdvise() function to set up a connection point (183216)


The information in this article applies to:

  • The Microsoft Active Template Library (ATL) 3.0, when used with:
    • Microsoft Visual C++, 32-bit Enterprise Edition 4.2b
    • Microsoft Visual C++, 32-bit Enterprise Edition 5.0
    • Microsoft Visual C++, 32-bit Enterprise Edition 6.0
    • Microsoft Visual C++, 32-bit Professional Edition 4.2b
    • Microsoft Visual C++, 32-bit Professional Edition 5.0
    • Microsoft Visual C++, 32-bit Professional Edition 6.0
    • Microsoft Visual C++, 32-bit Learning Edition 6.0
    • Microsoft Visual C++ .NET (2002)
    • Microsoft Visual C++ .NET (2003)
  • The Microsoft Active Template Library (ATL) 2.0, when used with:
    • Microsoft Visual C++, 32-bit Enterprise Edition 4.2b
    • Microsoft Visual C++, 32-bit Enterprise Edition 5.0
    • Microsoft Visual C++, 32-bit Enterprise Edition 6.0
    • Microsoft Visual C++, 32-bit Professional Edition 4.2b
    • Microsoft Visual C++, 32-bit Professional Edition 5.0
    • Microsoft Visual C++, 32-bit Professional Edition 6.0
    • Microsoft Visual C++, 32-bit Learning Edition 6.0
    • Microsoft Visual C++ .NET (2002)
    • Microsoft Visual C++ .NET (2003)
  • The Microsoft Active Template Library (ATL) 2.1, when used with:
    • Microsoft Visual C++, 32-bit Enterprise Edition 4.2b
    • Microsoft Visual C++, 32-bit Enterprise Edition 5.0
    • Microsoft Visual C++, 32-bit Enterprise Edition 6.0
    • Microsoft Visual C++, 32-bit Professional Edition 4.2b
    • Microsoft Visual C++, 32-bit Professional Edition 5.0
    • Microsoft Visual C++, 32-bit Professional Edition 6.0
    • Microsoft Visual C++, 32-bit Learning Edition 6.0
    • Microsoft Visual C++ .NET (2002)
    • Microsoft Visual C++ .NET (2003)
This article was previously published under Q183216

SYMPTOMS

Calling the AtlAdvise() function to setup a connection point might return one of the following error numbers:
0x80004002 (E_NOINTERFACE or "No such interface supported")
0x80040200 (CONNECT_E_NOCONNECTION)
0x80040202 (CONNECT_E_CANNOTCONNECT)

CAUSE

E_NOINTERFACE Error

The E_NOINTERFACE error is returned when AtlAdvise() calls the QueryInterface() method for IID_IConnectionPointContainer and fails.

CONNECT_E_NOCONNECTION Error

The CONNECT_E_NOCONNECTION error is returned when AtlAdvise() calls the IConnectionPointContainer::FindConnectionPoint() method and fails. The ATL implementation of the IConnectionPointContainerImpl::FindConnectionPoint() function looks in the connection point map for the event interface and returns this error if it doesn't find it.

CONNECT_E_CANNOTCONNECT Error

The CONNECT_E_CANNOTCONNECT error is returned when AtlAdvise() calls the IConnectionPoint::Advise() method and fails. The ATL implementation of the IConnectionPointImpl::Advise() function calls QueryInterface() on the sink object (the client), looking for the event interface, and returns this error if it doesn't find it.

RESOLUTION

E_NOINTERFACE Error

For the E_NOINTERFACE error, verify that the source or server supports the IconnectionPointContainer interface. In ATL, this means that the source object should derive from the IConnectionPointContainerImpl class and that IConnectionPointContainer needs to be in the COM map, as in the following example:

Sample Code

class ATL_NO_VTABLE CMySource :
  public IConnectionPointContainerImpl<CMySource>
  ...

BEGIN_COM_MAP(CMySource)
  ...
  COM_INTERFACE_ENTRY_IMPL(IConnectionPointContainer)
END_COM_MAP()

CONNECT_E_NOCONNECTION Error

For the CONNECT_E_NOCONNECTION error, verify that there is a connection point entry for the globally unique identifier (GUID) of the event interface in the connection point map, as in the following example:

Sample Code

BEGIN_CONNECTION_POINT_MAP(CMySource)
   CONNECTION_POINT_ENTRY(DIID__MySourceEvents)
END_CONNECTION_POINT_MAP()

CONNECT_E_CANNOTCONNECT Error

For the CONNECT_E_CANNOTCONNECT error, verify that the event interface is in the sink, or client, COM map, as in the following example: 
BEGIN_COM_MAP(CDispSink)
   COM_INTERFACE_ENTRY(IDispatch)
   COM_INTERFACE_ENTRY_IID(DIID__MySourceEvents, IDispatch)
END_COM_MAP()
Another cause of failure might be that the event interface is a custom interface and the source, or server, is out of process (an .exe file). You need to install a marshaler for the custom interface for QueryInterface() to work across process boundaries.

If all the methods of the event interface pass automation-compatible types (they are VARIANT-compatible), you can set an attribute of "oleautomation" in the source .idl file. When an ATL server is registered, its type library is also registered. This sets up the marshaler for this interface to be the universal marshaler (in OleAut32.dll).

If the event interface passes non-automation-compatible types, then a proxy DLL needs to be built and registered. The ATL Project Wizard creates a proxy makefile in your project directory with the name <Project>.mk. You can run NMake.exe on this .mk file to build the proxy DLL.

MORE INFORMATION

If you look up these HRESULTs in the Error Lookup tool, you get a different description. 0x80040200 appears as "Unable to impersonate DCOM client" or CO_E_FAILEDTOIMPERSONATE. 0x80040202 appears as "Unable to open the access token of the current thread" or CO_E_FAILEDTOOPENTHREADTOKEN. These HRESULTS have a Facility of FACILITY_ITF, which means they are used for custom interfaces and there can be duplicates (the Facility is bits 15-30 of the HRESULT).

AtlAdvise() wraps the following steps:
  1. Calls QueryInterface() to get an IConnectionPointContainer*.
  2. Calls IConnectionPointContainer::FindConnectionPoint() to get an IConnectionPoint*.
  3. Calls IConnectionPoint::Advise().

REFERENCES

Microsoft Visual C++ Samples, ATL Samples: POLYGON Sample; CONNECT Sample
Modification Type:MajorLast Reviewed:6/2/2005
Keywords:kbtshoot kbBug kbConnPts kbDebug kbprb KB183216 kbAudDeveloper
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