In This Topic ▼

IndexOf(int,int,int) Method

Summary

Returns the index of the first occurrence of an AudioFormat object whose name matches the given string.

Syntax

C++

public int IndexOf( 
   int SampleFrequency, 
   int BitsPerSample, 
   int Channels 
)

Public Overloads Function IndexOf( _ 
   ByVal SampleFrequency As Integer, _ 
   ByVal BitsPerSample As Integer, _ 
   ByVal Channels As Integer _ 
) As Integer

public: 
int IndexOf(  
   int SampleFrequency, 
   int BitsPerSample, 
   int Channels 
)

Parameters

SampleFrequency
A value representing the sample frequency of the AudioFormat to find.

BitsPerSample
A value representing the bits per sample of the AudioFormat to find.

Channels
A value representing the number of channels of the AudioFormat to find.

Return Value

The zero-based index position of the AudioFormat item found, or -1 if not found.

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 
   { 
      // set an audio device first, you should use your audio device name here 
      if (capturectrl.AudioDevices["USB"] == null) 
         throw new Exception("No USB audio device available"); 
 
      capturectrl.AudioDevices["USB"].Selected = true; 
 
      // reference the audio formats object 
      AudioFormats audioformats = capturectrl.AudioCaptureFormats; 
 
      // check the index of 8hz, 16-bit, stereo 
      int i = audioformats.IndexOf(8000, 16, 2); 
 
      // access the format via the collection indexer 
      AudioFormat af = audioformats[i]; 
 
      // check if the collection contains this format  
      // (it should we just got it with IndexOf above) 
      if (audioformats.Contains(af)) 
      { 
         // 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 
      ' set an audio device first, you should use your audio device name here 
      If capturectrl.AudioDevices("USB") Is Nothing Then 
         Throw New Exception("No USB audio device available") 
      End If 
 
      capturectrl.AudioDevices("USB").Selected = True 
 
      ' reference the audio formats object 
      Dim audioformats As AudioFormats = capturectrl.AudioCaptureFormats 
 
      ' check the index of 8hz, 16-bit, stereo 
      Dim i As Integer = audioformats.IndexOf(8000, 16, 2) 
 
      ' access the format via the collection indexer 
      Dim af As AudioFormat = audioformats(i) 
 
      ' check if the collection contains this format  
      ' (it should we just got it with IndexOf above) 
      If audioformats.Contains(af) 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

AudioFormats Class

AudioFormats Members

Overload List

Download our FREE evaluation

Help Version 21.0.2021.7.2

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies