IWMPContentPartnerCallback::SendMessageComplete method (contentpartner.h)

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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 It has been superseded by MediaPlayer.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 SendMessageComplete method notifies Windows Media Player that the online store has finished processing a message.

Syntax

HRESULT SendMessageComplete(
  [in] BSTR bstrMsg,
  [in] BSTR bstrParam,
  [in] BSTR bstrResult
);

Parameters

[in] bstrMsg

BSTR containing the message. See Remarks.

[in] bstrParam

BSTR containing the message parameters.

[in] bstrResult

BSTR containing the result.

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

The SendMessageComplete method is part of a chain of methods that are called to pass messages from the discovery page to the content partner plug-in. The following list describes the chain of calls:

The discovery page calls External.sendMessage, which has two string parameters: Msg and Param. Those two strings are meaningful only to the online store; they are not interpreted by Windows Media Player.
Windows Media Player passes the two strings (Msg and Param) along to the plug-in by calling IWMPContentPartner::SendMessage.
When the online store has finished processing the message, it passes the same two strings back to Windows Media Player by calling IWMPContentPartnerCallback::SendMessageComplete. It also passes a third string to SendMessageComplete that indicates the result of the message-processing attempt.
Windows Media Player passes all three strings back to the discovery page by raising the External.OnSendMessageComplete event.

Requirements

Requirement	Value
Minimum supported client	Windows Media Player 11
Target Platform	Windows
Header	contentpartner.h

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