IWMPQuery::addCondition method (wmp.h)

项目
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 It has been superseded by MediaPlayer.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.]

The addCondition method adds a condition to the compound query using AND logic.

Syntax

HRESULT addCondition(
  [in] BSTR bstrAttribute,
  [in] BSTR bstrOperator,
  [in] BSTR bstrValue
);

Parameters

[in] bstrAttribute

String containing the attribute name.

[in] bstrOperator

String containing the operator. See Remarks for supported values.

[in] bstrValue

String containing the attribute value.

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

Conditions contained in a compound query are organized into condition groups. Multiple conditions within a condition group are always concatenated by using AND logic. Condition groups are always concatenated to each other by using OR logic. To start a new condition group, call IWMPQuery::beginNextGroup.

Compound queries using IWMPQuery are not case sensitive.

A list of values for the bstrAttribute parameter can be found in the Alphabetical Attribute Reference section.

The following table lists the supported values for bstrOperator.

String	Applies To
BeginsWith	Strings
Contains	Strings
Equals	All types
GreaterThan	Numbers, Dates
GreaterThanOrEquals	Numbers, Dates
LessThan	Numbers, Dates
LessThanOrEquals	Numbers, Dates
NotBeginsWith	Strings
NotContains	Strings
NotEquals	All types

Windows Media Player 10 Mobile: This method is not supported.

Requirements


Minimum supported client	Windows Media Player 11.
Target Platform	Windows
Header	wmp.h
DLL	Wmp.dll