ReadMessage Method

Imports Leadtools 
Imports Leadtools.Multimedia 
Imports LeadtoolsMultimediaExamples.Fixtures 
 
Public _result As Boolean = False 
Public _serverAndClient As CaptureAndPlayCtrlForm = New CaptureAndPlayCtrlForm() 
 
Private _msgSent As Boolean = False 
Private _captureCtrl As CaptureCtrl 
Private _playCtrl As PlayCtrl 
Private _pMux As LMNetMux 
Private _pDemux As LMNetDmx 
 
Private Const _networkUrl As String = "ltsf://127.0.0.1:27015" ' network stream url 
Private Const _testMessage As String = "LEAD NETWORK" 
Dim _recordedVideoFile As String = Path.Combine(LEAD_VARS.MediaDir, "mediafiles/output/LMNetDmx_ReadMessageExample.mp4") 
 
Public Sub NetworkDemultiplexerExample() 
   ' reference the capture control 
   _captureCtrl = _serverAndClient.CaptureCtrl 
 
   ' reference the play control 
   _playCtrl = _serverAndClient.PlayCtrl 
 
   Try 
      ' try to find a video camera 
      If _captureCtrl.VideoDevices("Logitech") Is Nothing Then 
         Throw New Exception("No Logitech video device available") 
      End If 
 
      _captureCtrl.VideoDevices("Logitech").Selected = True 
 
      ' select a video compressor 
      _captureCtrl.VideoCompressors.Mpeg4.Selected = True 
 
      ' set the target output file 
      _captureCtrl.TargetFormat = TargetFormatType.NET 
      _captureCtrl.TargetFile = _networkUrl 
 
      If _captureCtrl.IsModeAvailable(CaptureMode.Video) Then 
         ' just 10 seconds of capture time 
         _captureCtrl.TimeLimit = 10 
         _captureCtrl.UseTimeLimit = True 
 
         _captureCtrl.FrameRate = 30 
         _captureCtrl.UseFrameRate = True 
 
         _captureCtrl.Preview = True 
 
         ' subscribe to the started and progress events for this example 
         ' we will connect a client after the capture starts 
         ' and send a test message after 5 seconds. 
         AddHandler _captureCtrl.Started, AddressOf CaptureCtrl_Started 
         AddHandler _captureCtrl.Progress, AddressOf CaptureCtrl_Progress 
 
         ' ready the capture graph in order to get the LNMetMux instance 
         _captureCtrl.ReadyCapture(CaptureMode.Video) 
 
         ' get the network multiplexer reference 
         _pMux = TryCast(_captureCtrl.GetSubObject(CaptureObject.TargetFilter), LMNetMux) 
 
         If Not _pMux Is Nothing Then 
            ' set some mux settings 
            _pMux.LiveSource = True 
         End If 
 
         ' start capture 
         _captureCtrl.StartCapture(CaptureMode.Video) 
 
         ' 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 OrElse _playCtrl.State = PlayState.Running 
            Application.DoEvents() 
         Loop 
 
         ' verify we have a recording file too 
         _result = _result And File.Exists(_recordedVideoFile) 
 
         ' release the mux and demux COM objects 
         If Not _pMux Is Nothing Then 
            Marshal.ReleaseComObject(_pMux) 
         End If 
 
         If Not _pDemux Is Nothing Then 
            Marshal.ReleaseComObject(_pDemux) 
         End If 
      End If 
   Catch e1 As Exception 
      _result = False 
   End Try 
End Sub 
 
Private Sub CaptureCtrl_Progress(ByVal sender As Object, ByVal e As ProgressEventArgs) 
   ' for this test we will send a message after  
   ' 5 secs of capture time 
   If e.time > 5000 AndAlso (Not _msgSent) Then 
      _pMux.WriteMessage(_testMessage) 
      Console.WriteLine("Server sent message") 
      _msgSent = True 
   End If 
End Sub 
 
Private Sub CaptureCtrl_Started(ByVal sender As Object, ByVal e As EventArgs) 
   StartClient() 
End Sub 
 
Private Sub StartClient() 
   Try 
      Dim netSrc As LMNetSrc = New LMNetSrc() 
      netSrc.CheckConnection(_networkUrl, 0, 5000) 
      Marshal.ReleaseComObject(netSrc) 
   Catch cex As COMException 
      ' could not connect 
      Return 
   End Try 
 
   _playCtrl.SourceFile = _networkUrl 
   _pDemux = TryCast(_playCtrl.GetSubObject(PlayObject.Splitter), LMNetDmx) 
 
   If Not _pDemux Is Nothing AndAlso _pDemux.AutoLiveTolerance < 5 Then 
      ' reset the demux settings to defaults 
      _pDemux.ResetToDefaults() 
 
      ' set the live tolerance setting to 5 seconds 
      ' this will cause the playback to be smoother on jittery 
      ' network connections -- although, the playback may lag  
      ' behing the live stream when using a tolerance value > 0 
      _pDemux.AutoLiveTolerance = 5 
 
      ' set the output filename for recorded video 
      _pDemux.OutputFileName = _recordedVideoFile 
   End If 
 
   _serverAndClient.TestTimer.Interval = 100 
   AddHandler _serverAndClient.TestTimer.Tick, AddressOf PlayTimer_Tick 
   _serverAndClient.TestTimer.Start() 
End Sub 
 
Private Sub PlayTimer_Tick(ByVal sender As Object, ByVal e As EventArgs) 
   _serverAndClient.TestTimer.Enabled = False 
   If Not _pDemux Is Nothing Then 
      ' read any messages here 
      Dim msg As String = _pDemux.ReadMessage() 
 
      ' set the result to what we expect 
      If msg = _testMessage Then 
         _result = True 
         Console.WriteLine("Client received message") 
      End If 
 
      ' get the bitrate 
      Dim bitRate As Integer = _pDemux.BitRate 
      Console.WriteLine("Client bitrate = {0}", bitRate) 
   End If 
   _serverAndClient.TestTimer.Enabled = True 
End Sub 
 
Public NotInheritable Class LEAD_VARS 
   Public Const MediaDir As String = "C:\LEADTOOLS21\Media" 
End Class