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Item Property

Summary

Gets the CaptureSubType item at the specified index.

Syntax

C#
VB
C++
public CaptureSubType Item( 
   int index 
) { get; } 
Public Overloads ReadOnly Property Item( _ 
   ByVal index As Integer _ 
) As Leadtools.Mediafoundation.CaptureSubType 

Parameters

index
The zero-based index of the item to get.

Property Value

The CaptureSubType item at the specified index.

Exceptions

ExceptionDescription
System.ArgumentOutOfRangeExceptionThe exception that is thrown when the value of an argument is outside the allowable range of values as defined by the invoked method.
Remarks

This property provides the ability to access a specific item in the collection by using the following syntax: myCollection[index] The C# language uses the this keyword to define the indexers instead of implementing the Item property. VB implements Item as a default property, which provides the same indexing functionality.

Example

C#
VB
using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
public void IndexContainsExample() 
{ 
   try 
   { 
      // reference the form capture control 
      CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
      // set a video device first, you should use your video device name here 
      if (capturectrl.VideoDevices["Analog"] == null) 
         throw new Exception("No Analog video device available"); 
 
      capturectrl.VideoDevices["Analog"].Selected = true; 
 
      // reference the video capture subtypes collection 
      CaptureSubTypes stypes = capturectrl.VideoCaptureSubTypes; 
 
      // check for RGB24 subtype 
      int i = stypes.IndexOf(Constants.MEDIASUBTYPE_YUY2); 
 
      // access the input via the collection indexer 
      CaptureSubType cs = stypes[i]; 
 
      // check if the collection contains this subtype  
      // (it should we just got it with IndexOf above!) 
      if (stypes.Contains(cs)) 
      { 
         // set the result to what we expect 
         _result = true; 
      } 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
} 
Imports Leadtools 
Imports Leadtools.MediaFoundation 
Imports LeadtoolsMediaFoundationExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As CaptureCtrlForm = New CaptureCtrlForm() 
 
Public Sub IndexContainsExample() 
   Try 
      ' reference the form capture control 
      Dim capturectrl As CaptureCtrl = _form.CaptureCtrl 
 
      ' set a video device first, you should use your video device name here 
      If capturectrl.VideoDevices("Analog") Is Nothing Then 
         Throw New Exception("No Analog video device available") 
      End If 
 
      capturectrl.VideoDevices("Analog").Selected = True 
 
      ' reference the video capture subtypes collection 
      Dim stypes As CaptureSubTypes = capturectrl.VideoCaptureSubTypes 
 
      ' check for RGB24 subtype 
      Dim i As Integer = stypes.IndexOf(Leadtools.MediaFoundation.Constants.MEDIASUBTYPE_YUY2) 
 
      ' access the input via the collection indexer 
      Dim cs As CaptureSubType = stypes(i) 
 
      ' check if the collection contains this subtype  
      ' (it should we just got it with IndexOf above!) 
      If stypes.Contains(cs) Then 
         ' set the result to what we expect 
         _result = True 
      End If 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub 

Requirements

Target Platforms

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Leadtools.MediaFoundation Assembly