KB183216 - You may receive an error message when you call the AtlAdvise() function to set up a connection point

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.

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

SYMPTOMS

CAUSE

E_NOINTERFACE Error

CONNECT_E_NOCONNECTION Error

CONNECT_E_CANNOTCONNECT Error

RESOLUTION

E_NOINTERFACE Error

Sample Code

CONNECT_E_NOCONNECTION Error

Sample Code

CONNECT_E_CANNOTCONNECT Error

MORE INFORMATION

REFERENCES