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Item Property (VideoFormats)

Summary

Gets the VideoFormat item at the specified index.

Syntax

C++

public Leadtools.Multimedia.VideoFormat this[  
   int index 
]; {get;}

Public ReadOnly Default Property Item( _ 
   ByVal index As Integer _ 
) As Leadtools.Multimedia.VideoFormat

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

Parameters

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

Property Value

The VideoFormat item at the specified index.

Exceptions

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.

Remarks

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. VB implements Item as a default property, which provides the same indexing functionality.

Example

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; 
   } 
}

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