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Refresh Method

Summary

Rebuilds the device collection.

Syntax

C++

public void Refresh()

Public Sub Refresh()

public: 
void Refresh();

Remarks

Rebuilds the device collection. This method will rebuild the collection of system-registered devices. It is usually called from applications that respond to system device change notifications. If the method fails, an error is raised. For more information, refer to the Error Codes.

Example

using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
public bool _result = false; 
public ConvertCtrlForm _form = new ConvertCtrlForm(); 
 
public void TargetDevicesExample() 
{ 
   string inputName, inputFriendlyName; 
   int selectedCamera; 
 
   // reference the convert control 
   ConvertCtrl convertctrl = _form.ConvertCtrl; 
 
   try 
   { 
      // get the target devices object 
      TargetDevices devices = convertctrl.TargetDevices; 
 
      // select an input by name if possible 
      if (devices["Microsoft DV Camera"] == null) 
         throw new Exception("No MS DV Camera device available!"); 
 
      devices["Microsoft DV Camera"].Selected = true; 
 
      // get the full friendly name of the device  
      string friendlyName = devices["Microsoft DV Camera"].FriendlyName; 
 
      // get the selected index of the currently selected target device 
      // (the MS DV camera above) 
      selectedCamera = devices.Selection; 
 
      // now enumerate all the target devices, 
      // looking for an audio device and select it 
      foreach (TargetDevice td in devices) 
      { 
         // get the inputs properties 
         inputName = td.Name; 
         inputFriendlyName = td.FriendlyName; 
 
         // if we found a target audio device 
         if (inputFriendlyName.Contains("Audio")) 
         { 
            // select it and break 
            td.Selected = true; 
            break; 
         } 
      } 
 
      // set the result to what we expect 
      _result = (selectedCamera != devices.Selection); 
 
   } 
   catch (Exception) 
   { 
      _result = false; 
   } 
}

Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _form As ConvertCtrlForm = New ConvertCtrlForm() 
 
Public Sub TargetDevicesExample() 
   Dim inputName, inputFriendlyName As String 
   Dim selectedCamera As Integer 
 
   ' reference the convert control 
   Dim convertctrl As ConvertCtrl = _form.ConvertCtrl 
 
   Try 
      ' get the target devices object 
      Dim devices As TargetDevices = convertctrl.TargetDevices 
 
      ' select an input by name if possible 
      If devices("Microsoft DV Camera") Is Nothing Then 
         Throw New Exception("No MS DV Camera device available!") 
      End If 
 
      devices("Microsoft DV Camera").Selected = True 
 
      ' get the full friendly name of the device  
      Dim friendlyName As String = devices("Microsoft DV Camera").FriendlyName 
 
      ' get the selected index of the currently selected target device 
      ' (the MS DV camera above) 
      selectedCamera = devices.Selection 
 
      ' now enumerate all the target devices, 
      ' looking for an audio device and select it 
      For Each td As TargetDevice In devices 
         ' get the inputs properties 
         inputName = td.Name 
         inputFriendlyName = td.FriendlyName 
 
         ' if we found a target audio device 
         If inputFriendlyName.Contains("Audio") Then 
            ' select it and break 
            td.Selected = True 
            Exit For 
         End If 
      Next td 
 
      ' set the result to what we expect 
      _result = (selectedCamera <> devices.Selection) 
 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub

Requirements

Target Platforms

Reference

TargetDevices Class

TargetDevices Members

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Help Version 20.0.2020.4.2

Leadtools.Multimedia Assembly

Introduction

Getting Started

Namespaces

Leadtools.Multimedia Namespace

Leadtools.Multimedia.Common Namespace

Assemblies