IWMPSubscriptionServiceCallback::onComplete method (subscriptionservices.h)

[アーティクル]
4/26/2023

[The feature associated with this page, Windows Media Player SDK, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of Windows Media Player SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

Note This section describes functionality designed for use by online stores. Use of this functionality outside the context of an online store is not supported.

The onComplete method notifies Windows Media Player when a background process is completed.

Syntax

HRESULT onComplete(
  [in] HRESULT hrResult
);

Parameters

[in] hrResult

HRESULT success or error code.

Return value

The method returns an HRESULT. Possible values include, but are not limited to, those in the following table.

Return code	Description
S_OK	The method succeeded.

Remarks

IWMPSubscriptionService2::prepareForSync and IWMPSubscriptionService2::deviceAvailable supply a pointer to an IWMPSubscriptionServiceCallback interface. When responding to calls from Windows Media Player to these methods, you must pass any time-consuming tasks to a separate worker thread and return immediately. When the worker thread has completed its task, it must call IWMPSubscriptionServiceCallback::onComplete.

In your prepareForSync and deviceAvailable methods, use the following procedure to provide your worker thread with a pointer to an IWMPSubscriptionServiceCallback interface.

Pass the pointer supplied in the pCB parameter to CoMarshalInterThreadInterfaceInStream, which returns an IStream pointer.
Pass the IStream pointer to your worker thread.
In your worker thread, call CoGetInterfaceAndReleaseStream, which returns an interface pointer that you can use to call onComplete.

Requirements

Requirement	Value
Minimum supported client	Windows Media Player 10 or later.
Target Platform	Windows
Header	subscriptionservices.h

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