IResourceManager::CancelRequest method (strmif.h)

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The CancelRequest method cancels the request for a resource.

Syntax

HRESULT CancelRequest(
  [in] LONG              idResource,
  [in] IResourceConsumer *pConsumer
);

Parameters

[in] idResource

Resource identifier of a pending request.

[in] pConsumer

Pointer to the IResourceConsumer interface that made the request.

Return value

Returns an HRESULT value that depends on the implementation. HRESULT can be one of the following standard constants, or other values not listed.

Return code Description
E_FAIL
Failure.
E_POINTER
NULL pointer argument.
E_INVALIDARG
Invalid argument.
E_NOTIMPL
Method isn't supported.
S_OK or NOERROR
Success.

Remarks

This method should be called when the IResourceConsumer object that requested the resource has not received it and no longer requires it. If it has already received the resource, it should use the IResourceManager::NotifyRelease method.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header strmif.h (include Dshow.h)
Library Strmiids.lib

See also

Error and Success Codes

IResourceManager Interface