GetPreferredFilter Method

Summary

Retrieves the preferred filter's Display Name set using the SetPreferredFilter method.

Syntax
C#
VB
C++
public virtual string GetPreferredFilter( 
   PreferredFilter filterType 
) 
Public Overridable Function GetPreferredFilter( _ 
   ByVal filterType As PreferredFilter _ 
) As String 
public: 
virtual String^ GetPreferredFilter(  
   PreferredFilter filterType 
)  

Parameters

filterType
A PreferredFilter enumeration value specifying the desired filter type

Return Value

A string containing a filter's display name.

Remarks

This method can be used to determine whether a preferred filter has been set by SetPreferredFilter. It will return NULL (if no preferred filter has been set) or a display name indicating the preferred filter. A display name uniquely identifies the filter. Display names have the following format:

@device:sw:GUID\GUID

For example, the display name for the LEAD MPEG2 Transport Demultiplexer is: @device:sw:{083863F1-70DE-11D0-BD40-00A0C911CE86}\{E2B7DF1A-38C5-11D5-91F6-00104BDB8FF9}

A list of display names for common filters can be found in Constants.PreferredFilters.

Please see SetPreferredFilter for more information on filter display names.

Example
C#
VB
using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
public void CapturePreferredFiltersExample() 
{ 
   CaptureCtrl captureCtrl = _form.CaptureCtrl; 
 
   try 
   { 
      // set the preferred H264 decompressor to the LEAD default (which is the LEAD H264 Decoder) 
      captureCtrl.SetPreferredFilter(PreferredFilter.H264Decompressor, Constants.PreferredFilters.LEADDefault); 
 
      // the default H264 Decompressor should be the LEAD H264 Decoder now 
      // filter names are not case sensitive, so ignore case in the compare 
      _result = (string.Compare(captureCtrl.GetPreferredFilter(PreferredFilter.H264Decompressor), 
                 Constants.PreferredFilters.H264Decompressor, true) == 0); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As CaptureCtrlForm = New CaptureCtrlForm() 
 
Public Sub CapturePreferredFiltersExample() 
   Try 
      ' reference the forms capture control 
      Dim captureCtrl As CaptureCtrl = _form.CaptureCtrl 
 
      ' set the preferred H264 decompressor to the LEAD default (which is the LEAD H264 Decoder) 
      captureCtrl.SetPreferredFilter(PreferredFilter.H264Decompressor, Leadtools.Multimedia.Constants.PreferredFilters.LEADDefault) 
 
      ' the default H264 Decompressor should be the LEAD H264 Decoder now 
      ' the filter names are not case sensitive, so do ignore the case in the compare 
      _result = (String.Compare(captureCtrl.GetPreferredFilter(PreferredFilter.H264Decompressor), Leadtools.Multimedia.Constants.PreferredFilters.H264Decompressor, True) = 0) 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub 
Requirements

Target Platforms

Help Version 20.0.2019.11.25
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Leadtools.Multimedia Assembly