LEADTOOLS Multimedia (Leadtools.MediaFoundation assembly)

Item(Int32) Property

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Example 



The zero-based index of the item to get.
Gets the CaptureSubType item at the specified index.
Syntax
'Declaration
 
Public Overloads ReadOnly Property Item( _
   ByVal index As Integer _
) As CaptureSubType
'Usage
 
Dim instance As CaptureSubTypes
Dim index As Integer
Dim value As CaptureSubType
 
value = instance.Item(index)
public CaptureSubType Item( 
   int index
) {get;}
public:
property CaptureSubType^ Item {
   CaptureSubType^ get(int index);
}

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. Visual Basic implements Item as a default property, which provides the same indexing functionality.
Example
Copy Code  
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
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;
   }
}
Requirements

Target Platforms

See Also

Reference

CaptureSubTypes Class
CaptureSubTypes Members
Overload List

 

 


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