Item Property (VideoFormats)

Visual Basic
C#
C++/CLI

'Declaration
 
Public ReadOnly Default Property Item( _
   ByVal index As Integer _
) As VideoFormat

'Usage
 
Dim instance As VideoFormats
Dim index As Integer
Dim value As VideoFormat
 
value = instance.Item(index)

public VideoFormat this[ 
   int index
]; {get;}

public:
property VideoFormat^ default [int] {
   VideoFormat^ get(int index);
}

Parameters

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

Property Value

The VideoFormat item at the specified index.

Exception	Description
System.ArgumentOutOfRangeException	The exception that is thrown when the value of an argument is outside the allowable range of values as defined by the invoked method.

This property makes it possible to access a specific item in the collection by using the following syntax: myCollection[index]. The C# language uses 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.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Imports Leadtools
Imports Leadtools.Multimedia
Imports LeadtoolsMultimediaExamples.Fixtures

Public _result As Boolean = False
Public _form As CaptureCtrlForm = New CaptureCtrlForm()
Public Sub IndexContainsExample()
   ' reference the capture control
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl

   ' reference the video formats object
   Dim videoformats As VideoFormats = capturectrl.VideoCaptureFormats

   Try
      ' select a video device, use your device name here instead of USB
      If capturectrl.VideoDevices("USB") Is Nothing Then
         Throw New Exception("No USB video device available")
      End If

      capturectrl.VideoDevices("USB").Selected = True

      ' check the index of YUY2 320 x 240 video
      Dim i As Integer = videoformats.IndexOf("{32595559-0000-0010-8000-00AA00389B71}", 320, 240)

      ' access the format via the collection indexer
      Dim vf As VideoFormat = videoformats(i)

      ' check if the collection contains this format 
      ' (it should we just got it with IndexOf above)
      If videoformats.Contains(vf) 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.Multimedia;
using LeadtoolsMultimediaExamples.Fixtures;

public bool _result = false;
public CaptureCtrlForm _form = new CaptureCtrlForm();
public void IndexContainsExample()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   // reference the video formats object
   VideoFormats videoformats = capturectrl.VideoCaptureFormats;

   try
   {
      // select a video device, use your device name here instead of USB
      if (capturectrl.VideoDevices["USB"] == null)
         throw new Exception("No USB video device available");

      capturectrl.VideoDevices["USB"].Selected = true;

      // check the index of YUY2 320 x 240 video
      int i = videoformats.IndexOf("{32595559-0000-0010-8000-00AA00389B71}", 320, 240);

      // access the format via the collection indexer
      VideoFormat vf = videoformats[i];

      // check whether the collection contains this format 
      // (it should we just got it with IndexOf above)
      if (videoformats.Contains(vf))
      {
         // set the result to what we expect
         _result = true;
      }
   }
   catch (Exception)
   {
      _result = false;
   }
}

Target Platforms

Reference

VideoFormats Class
VideoFormats Members