IWMPQuery::addCondition method
[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 It has been superseded by MediaPlayer.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
public void addCondition(
System.String bstrAttribute,
System.String bstrOperator,
System.String bstrValue
);
Public Sub addCondition( _
ByVal bstrAttribute As System.String, _
ByVal bstrOperator As System.String, _
ByVal bstrValue As System.String _
)
Implements IWMPQuery.addCondition
Parameters
-
bstrAttribute [in]
-
A System.String that is the name of the attribute to be added to the query.
-
bstrOperator [in]
-
A System.String that is the operator. See Remarks for supported values.
-
bstrValue [in]
-
A System.String that is the attribute value.
Return value
This method does not return a value.
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 Alphabetical Attribute Reference.
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 |
Examples
The following example creates a query, adds two conditions to it, and uses that query to extract the results of the query as a string collection. The results are then displayed in a list box. The AxWMPLib.AxWindowsMediaPlayer object is represented by the variable named player.
// Get a new Query interface.
WMPLib.IWMPMediaCollection2 mc = (WMPLib.IWMPMediaCollection2)player.mediaCollection;
WMPLib.IWMPQuery q = mc.createQuery();
// Add two conditions to the Query.
q.addCondition("WM/Composer", "Equals", "Antonio Vivaldi");
q.addCondition("Title", "Contains", "Trio");
// Query the media collection and get a string collection containing the result.
// In this case, the string collection will contain the titles of all audio items that
// match the query.
WMPLib.IWMPStringCollection2 result = (WMPLib.IWMPStringCollection2)mc.getStringCollectionByQuery("Title", q, "audio", "", false);
// Display the results by adding them to a list box.
for (int i = 0; i < result.count; i++)
{
queryResults.Items.Add(result.Item(i));
}
' Get a new Query interface.
Dim mc As WMPLib.IWMPMediaCollection2 = player.mediaCollection
Dim q As WMPLib.IWMPQuery = mc.createQuery()
' Add two conditions to the Query.
q.addCondition("WM/Composer", "Equals", "Antonio Vivaldi")
q.addCondition("Title", "Contains", "Trio")
' Query the media collection and get a string collection containing the result.
' In this case, the string collection will contain the titles of all audio items that
' match the query.
Dim result As WMPLib.IWMPStringCollection2 = mc.getStringCollectionByQuery("Title", q, "audio", "", False)
' Display the results by adding them to a list box.
For i As Integer = 0 To (result.count - 1)
queryResults.Items.Add(result.Item(i))
Next i
Requirements
| Requirement | Value |
|---|---|
| Version |
Windows Media Player 11. |
| Namespace |
WMPLib |
| Assembly |
|