CoGetCancelObject function (combaseapi.h)

Obtains a pointer to a call control interface, normally ICancelMethodCalls, on the cancel object corresponding to an outbound COM method call pending on the same or another client thread.

Syntax

HRESULT CoGetCancelObject(
  [in]  DWORD  dwThreadId,
  [in]  REFIID iid,
  [out] void   **ppUnk
);

Parameters

[in] dwThreadId

The identifier of the thread on which the pending COM call is to be canceled. If this parameter is 0, the call is on the current thread.

[in] iid

The globally unique identifier of an interface on the cancel object for the call to be canceled. This argument is usually IID_ICancelMethodCalls.

[out] ppUnk

Receives the address of a pointer to the interface specified by riid.

Return value

This function can return the standard return values E_FAIL, E_INVALIDARG, E_OUTOFMEMORY, and E_UNEXPECTED, as well as the following values.

Remarks

If two or more calls are pending on the same thread through nested calls, the thread ID may not be sufficient to identify the call to be canceled. In this case, CoGetCancelObject returns a cancel interface corresponding to the innermost call that is pending on the thread and has registered a cancel object.

This function does not locate cancel objects for asynchronous calls.

Requirements