PreviewingClosedCaption Property

'Declaration
 
Public Overridable ReadOnly Property PreviewingClosedCaption As Boolean

Public _result As Boolean = False
      Public _form As CaptureCtrlForm = New CaptureCtrlForm()
      Public _capturectrl As CaptureCtrl
      Public Sub ClosedCaptioningExample()
         ' reference the capture control
         _capturectrl = _form.CaptureCtrl

         ' output file names
         Dim outFile As String = Path.Combine(LEAD_VARS.MediaDir, "CaptureCtrl_ClosedCaptioningExample_DVD")

         Try
            ' try to find a Digital tuner, use your device name here
            If _capturectrl.VideoDevices("Analog") Is Nothing Then
               Throw New Exception("No Analog video device available")
            End If

            _capturectrl.VideoDevices("Analog").Selected = True

            ' select video and audio compressors
            _capturectrl.VideoCompressors.Mpeg2.Selected = True
            _capturectrl.AudioCompressors.AC3.Selected = True

            ' set the target format to MPEG2 program
            _capturectrl.TargetFormat = TargetFormatType.MPEG2Program

            If _capturectrl.HasDialog(CaptureDlg.TargetFormat) Then
               _capturectrl.ShowDialog(CaptureDlg.TargetFormat, _form)
            End If

            ' tune to a channel with closed captions
            _capturectrl.TVTuner.SetChannel(28, -1, -1)

            ' set the target file
            _capturectrl.TargetFile = outFile

            ' enable the preview
            _capturectrl.Preview = True

            ' check if closed captioning is enabled
            If _capturectrl.ClosedCaptionAvailable AndAlso _capturectrl.ClosedCaptioning = False Then
               ' try to toggle closed captioning 
               _capturectrl.ToggleClosedCaptioning()

               ' set the result to what we expect
               If _capturectrl.ClosedCaptioning Then
                  _result = True
               End If

               ' get the previewing cc state
               Dim _previewCC As Boolean = _capturectrl.PreviewingClosedCaption
            End If

            ' check if we have can capture video
            If _capturectrl.IsModeAvailable(CaptureMode.VideoAndAudio) Then
               _capturectrl.TimeLimit = 30 ' just 30 seconds of capture time
               _capturectrl.UseTimeLimit = True

               ' start the capture process
               _capturectrl.StartCapture(CaptureMode.VideoAndAudio)

               ' we'll loop on the state and pump messages for this example.
               ' but you should not need to if running from a Windows Forms application.
               Do While _capturectrl.State = CaptureState.Running
                  Application.DoEvents()
               Loop

               _result = True
            End If
         Catch e1 As Exception
            _result = False
         End Try

         ' we'll loop on the state and pump messages for this example.
         ' but you should not need to if running from a Windows Forms application.
         Do While _capturectrl.State = CaptureState.Running
            Application.DoEvents()
         Loop
      End Sub

Public NotInheritable Class LEAD_VARS
   Public Const MediaDir As String = "C:\Program Files (x86)\LEAD Technologies\LEADTOOLS 175\Media";
End Class