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Item Property

Summary

Gets the Device item with the specified name.

Syntax

C++

public Device Item( 
   string name 
) { get; }

Public Overloads ReadOnly Property Item( _ 
   ByVal name As String _ 
) As Device

public: 
property Device^ Item { 
   Device^ get(String^ name); 
}

Parameters

name
The string name of the item to get.

Property Value

The Device item with the specified name.

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.
System.NullReferenceException	The exception that is thrown when there is an attempt to dereference a null object reference.

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.

Device names are unique. An application can use this method to find a specific device. A Device name can be retrieved with the Device.Name property.

If the method fails, an error is raised. For more information, refer to the Error Codes.

Example

using Leadtools; 
using Leadtools.MediaFoundation; 
using LeadtoolsMediaFoundationExamples.Fixtures; 
 
public bool _result = false; 
public CaptureCtrlForm _form = new CaptureCtrlForm(); 
 
public void IndexContainsExample() 
{ 
   // reference the capture control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
   try 
   { 
      // select a video device, use your device name here instead of Analog 
      if (capturectrl.VideoDevices["Analog"] == null) 
         throw new Exception("No Analog video tuner device available"); 
 
      capturectrl.VideoDevices["Analog"].Selected = true; 
 
      // reference the video devices object 
      Devices devices = capturectrl.VideoDevices; 
 
      // check the index of a USB video device 
      int i = devices.IndexOf("USB"); 
 
      Device dev = null; 
      if (i > -1) 
         // access the input via the collection indexer 
         dev = devices[i]; 
 
      // check if the collection contains this input  
      // (it should we just got it with IndexOf above) 
      if (devices.Contains(dev)) 
      { 
         // 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() 
   ' reference the capture control 
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl 
 
   Try 
      ' select a video device, use your device name here instead of Analog 
      If capturectrl.VideoDevices("Analog") Is Nothing Then 
         Throw New Exception("No Analog video tuner device available") 
      End If 
 
      capturectrl.VideoDevices("Analog").Selected = True 
 
      ' reference the video devices object 
      Dim devices As Devices = capturectrl.VideoDevices 
 
      ' check the index of a USB video device 
      Dim i As Integer = devices.IndexOf("USB") 
 
      Dim dev As Device = Nothing 
      If i > -1 Then 
         ' access the input via the collection indexer 
         dev = devices(i) 
      End If 
 
      ' check if the collection contains this input  
      ' (it should we just got it with IndexOf above) 
      If devices.Contains(dev) 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

Reference

Devices Class

Devices Members

Overload List

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Help Version 20.0.2020.4.2

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies