Item(String) Property

Visual Basic
C#
C++/CLI

'Declaration
 
Public Overloads Property Item( _
   ByVal name As String _
) As TargetVideoFormat

'Usage
 
Dim instance As TargetVideoFormats
Dim name As String
Dim value As TargetVideoFormat
 
instance.Item(name) = value
 
value = instance.Item(name)

public TargetVideoFormat Item( 
   string name
) {get; set;}

public:
property TargetVideoFormat^ Item {
   TargetVideoFormat^ get(String^ name);
   void set (String^ name, TargetVideoFormat^ value);
}

Parameters

name: The string name of the item to get or set.

Property Value

The TargetVideoFormat item with the specified name.

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.

This property allows access to 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. An application can use this method to find a specific target video format. If the method fails, an error is raised. For more information, refer to the Error Codes.

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

Copy Code

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
      ' set an video device first, you should use your video device name here
      If capturectrl.VideoDevices("USB") Is Nothing Then
         Throw New Exception("No USB video device available")
      End If

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

      ' reference the target formats object
      Dim formats As TargetFormats = capturectrl.TargetFormats

      ' reference the target format object
      Dim tf As TargetFormat = formats(TargetFormatType.MP4)

      ' reference the target video formats object
      Dim tvformats As TargetVideoFormats = tf.VideoFormats

      ' check the index using a name string
      Dim i As Integer = tvformats.IndexOf("{34363248-0000-0010-8000-00AA00389B71}") ' H264

      ' get target video format object
      Dim tvf As TargetVideoFormat = tvformats(i)

      ' make sure the target video format object's name equals {00000161-0000-0010-8000-00AA00389B71}
      If tvf.Name = "{34363248-0000-0010-8000-00AA00389B71}" Then
         ' get target video format friendly name, use it for view propose.
         Dim friendlyname As String = tvf.FriendlyName
      Else
         Throw New Exception()
      End If

      ' select it
      tvf.Selected = True

      ' check if the collection contains this format 
      ' (it should we just got it with IndexOf above)
      If tvformats.Contains(tvf) 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()
{
   // reference the capture control
   CaptureCtrl capturectrl = _form.CaptureCtrl;

   try
   {
      // set an video device first, you should use your video device name here
      if (capturectrl.VideoDevices["USB"] == null)
         throw new Exception("No USB video device available");

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

      // reference the target formats object
      TargetFormats formats = capturectrl.TargetFormats;

      // reference the target format object
      TargetFormat tf = formats[TargetFormatType.MP4];

      // reference the target video formats object
      TargetVideoFormats tvformats = tf.VideoFormats;

      // check the index using a name string
      int i = tvformats.IndexOf("{34363248-0000-0010-8000-00AA00389B71}");// H264

      // get target video format object
      TargetVideoFormat tvf = tvformats[i];

      // make sure the target video format object's name equals {34363248-0000-0010-8000-00AA00389B71}
      if (tvf.Name == "{34363248-0000-0010-8000-00AA00389B71}")
      {
         // get target video format friendly name, use it for view propose.
         string friendlyname = tvf.FriendlyName;
      }
      else
         throw new Exception();

      // select it
      tvf.Selected = true;

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

Target Platforms

Reference

TargetVideoFormats Class
TargetVideoFormats Members
Overload List