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Selection Property

Summary

Gets or sets the zero-based index of the currently selected CaptureInput item.

Syntax

C++

public int Selection { get; set; }

Public Property Selection As Integer

public: 
property int Selection { 
   int get(); 
   void set (    int ); 
}

Property Value

The zero-based index of the selected item; or -1 if no item is selected.

Remarks

If this property is -1, then check the number of capture inputs in the Count Property. If the Count property is non-zero then the Video and Audio inputs do not match. This is only a warning and not an error. The inputs can be left the way they are. For more information on unmatched pairs of video and audio inputs, refer to CaptureInputs Object.

Assignment can raise an error exception. 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 CaptureInputsExample() 
{ 
   string inputName, inputFriendlyName; 
   int selection; 
 
   // reference the capture control 
   CaptureCtrl capturectrl = _form.CaptureCtrl; 
 
   // 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; 
 
   // get the audio inputs object 
   CaptureInputs inputs = capturectrl.VideoInputs; 
 
   try 
   { 
      // select an input by name if possible 
      if (inputs["Video Composite"] != null) 
         inputs["Video Composite"].Selected = true; 
 
      // get the current selected input 
      selection = inputs.Selection; 
 
      foreach (CaptureInput ci in inputs) 
      { 
         // get the inputs properties 
         inputName = ci.Name; 
         inputFriendlyName = ci.FriendlyName; 
 
         // if we found the video tuner input 
         if (inputFriendlyName == "Video Tuner") 
         { 
            // select it and break 
            ci.Selected = true; 
            break; 
         } 
      } 
 
      // set the result to what we expect 
      _result = (selection != inputs.Selection); 
 
   } 
   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 CaptureInputsExample() 
   Dim inputName, inputFriendlyName As String 
   Dim selection As Integer 
 
   ' reference the capture control 
   Dim capturectrl As CaptureCtrl = _form.CaptureCtrl 
 
   ' 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 
 
   ' get the audio inputs object 
   Dim inputs As CaptureInputs = capturectrl.VideoInputs 
 
   Try 
      ' select an input by name if possible 
      If Not inputs("Video Composite") Is Nothing Then 
         inputs("Video Composite").Selected = True 
      End If 
 
      ' get the current selected input 
      selection = inputs.Selection 
 
      For Each ci As CaptureInput In inputs 
         ' get the inputs properties 
         inputName = ci.Name 
         inputFriendlyName = ci.FriendlyName 
 
         ' if we found the video tuner input 
         If inputFriendlyName = "Video Tuner" Then 
            ' select it and break 
            ci.Selected = True 
            Exit For 
         End If 
      Next ci 
 
      ' set the result to what we expect 
      _result = (selection <> inputs.Selection) 
 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub

Requirements

Target Platforms

Reference

CaptureInputs Class

CaptureInputs Members

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Help Version 21.0.2021.7.2

Leadtools.MediaFoundation Assembly

Introduction

Getting Started

Namespaces

Leadtools.MediaFoundation Namespace

Leadtools.MediaFoundation.Common Namespace

Assemblies