IConnectionPointContainer::EnumConnectionPoints method (ocidl.h)

Article
02/22/2024

Creates an enumerator object to iterate through all the connection points supported in the connectable object, one connection point per outgoing IID.

Syntax

HRESULT EnumConnectionPoints(
  [out] IEnumConnectionPoints **ppEnum
);

Parameters

[out] ppEnum

A pointer to an IEnumConnectionPoints interface pointer variable that receives the pointer to the newly created enumerator.

Return value

This method can return the standard return values E_OUTOFMEMORY and E_UNEXPECTED, as well as the following values.

Return code	Description
S_OK	The enumerator object was created successfully.
E_POINTER	The address in ppEnum is not valid. For example, it may be NULL.

Remarks

Because IEnumConnectionPoints enumerates pointers to IConnectionPoint, the caller must use IConnectionPoint::GetConnectionInterface to determine the interface identifier of the outgoing interface that the connection point supports.

Notes to Callers

The caller is responsible for calling Release when the enumerator is no longer needed.

Notes to Implementers

Returning E_NOTIMPL is specifically disallowed because, with the exception of type information, there would be no other means through which a caller could find the IIDs of the outgoing interfaces. Since a connectable object typically has a fixed set of known outgoing interfaces, it is straightforward to implement the enumerator on top of a fixed length array of IIDs known at compile time.

Requirements

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps \| UWP apps]
Minimum supported server	Windows 2000 Server [desktop apps \| UWP apps]
Target Platform	Windows
Header	ocidl.h