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GetPreferredMediaSourceHandler Method

Summary

Retrieves the preferred media source handler's GUID set using the SetPreferredMediaSourceHandler method.

Syntax

C#
VB
C++
public virtual string GetPreferredMediaSourceHandler( 
   PreferredMediaSourceHandler MediaSourceHandlerType 
) 
Public Overridable Function GetPreferredMediaSourceHandler( _ 
   ByVal MediaSourceHandlerType As Leadtools.Mediafoundation.PreferredMediaSourceHandler _ 
) As String 
public: 
virtual String^ GetPreferredMediaSourceHandler(  
   Leadtools.Mediafoundation.PreferredMediaSourceHandler MediaSourceHandlerType 
)  

Parameters

MediaSourceHandlerType
A PreferredMediaSourceHandler enumeration value specifying the desired media source handler type

Return Value

A string containing a media source handler's GUID.

Remarks

This method can be used to determine whether a preferred media source handler has been set by SetPreferredMediaSourceHandler. It will return NULL (if no preferred media source handler has been set) or a GUID indicating the preferred media source handler. This GUID uniquely identifies the media source handler. Every media format has a registered media source handler(s) who are responsible of creating a media source for this media type.

For example, the GUID for the LEAD MPEG2 Transport Media Source Handler is: EFE626C3-0A2C-49FA-8A01-3768B559B6DA

A list of display names for common media source handlers can be found in Constants.PreferredMediaSourceHandlers.

Please see SetPreferredMediaSourceHandler for more information on media source handler display names.

Example

C#
VB
using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
public bool _result = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
 
public void ConverterPreferredMediaSourceHandlersExample() 
{ 
   ConvertCtrl convertCtrl = _form.ConvertCtrl; 
 
   try 
   { 
      // set the preferred MPEG2Transport media source handler to the LEAD default (which is the LEAD MPEG2 Transport Media Source handler) 
      convertCtrl.SetPreferredMediaSourceHandler(PreferredMediaSourceHandler.MPEG2Transport, Constants.PreferredMediaSourceHandlers.LEADDefault); 
 
      // the default MPEG2Transport media source should be the LEAD MPEG2 Transport Media Source handler now 
      _result = (string.Compare(convertCtrl.GetPreferredMediaSourceHandler(PreferredMediaSourceHandler.MPEG2Transport), 
                 Constants.PreferredMediaSourceHandlers.MPEG2Program, true) == 0); 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
Imports Leadtools 
Imports Leadtools.MediaFoundation 
Imports LeadtoolsMediaFoundationExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As ConvertCtrlForm = New ConvertCtrlForm() 
 
Public Sub ConverterPreferredMediaSourceHandlersExample() 
   Try 
      ' reference the forms capture control 
      Dim convertCtrl As ConvertCtrl = _form.ConvertCtrl 
 
      ' set the preferred MPEG2Transport media source handler to the LEAD default (which is the LEAD MPEG2 Transport Media Source handler) 
      convertCtrl.SetPreferredMediaSourceHandler(PreferredMediaSourceHandler.MPEG2Transport, 
                                     Leadtools.MediaFoundation.Constants.PreferredMediaSourceHandlers.LEADDefault) 
 
      ' the default MPEG2Transport media source should be the LEAD MPEG2 Transport Media Source handler now 
      _result = (String.Compare(convertCtrl.GetPreferredMediaSourceHandler(PreferredMediaSourceHandler.MPEG2Transport), 
                                Leadtools.MediaFoundation.Constants.PreferredMediaSourceHandlers.MPEG2Transport, True) = 0) 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub 

Requirements

Target Platforms

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Leadtools.MediaFoundation Assembly