ConnectionVersion Property

Summary
Gets a number that determines whether the connection list has changed since the last time it was checked.
Syntax
C#
C++/CLI
[DispIdAttribute(6)] 
int ConnectionVersion {get;} 
[DispIdAttribute(6)] 
property int ConnectionVersion { 
   int get(); 
} 

Property Value

An System.Int32 value that represents the version number of the connection list.

Remarks

If the version number is the same as the last time it was checked, then the connection list did not change.

Example
C#
using Leadtools; 
using Leadtools.Multimedia; 
using LeadtoolsMultimediaExamples.Fixtures; 
 
 
public bool _result = false; 
public CaptureAndPlayCtrlForm _serverAndClient = new CaptureAndPlayCtrlForm(); 
 
CaptureCtrl _captureCtrl; 
PlayCtrl _playCtrl; 
LMNetMux _pMux; 
LMNetSnk _pSink; 
 
const string _networkUrl = @"ltsf://127.0.0.1:27015"; // network stream url 
const string _networkAuthenticatedUrl = @"ltsf://User1:P99999@127.0.0.1:27015"; // network stream url 
const string TestMessage = "LEAD NETWORK"; 
 
public void RequireLoginExample() 
{ 
   // 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"] == null) 
         throw new Exception("No Logitech video device available"); 
 
      _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)) 
      { 
         // here we will only capture 15 seconds for this example. 
         // in a real application, you would not normally want to  
         // set the time limit for capture. 
         _captureCtrl.TimeLimit = 15; 
         _captureCtrl.UseTimeLimit = true; 
 
         // enable preview 
         _captureCtrl.Preview = true; 
 
         // subscribe to the started event for this example 
         // we will connect a client after the capture starts 
         _captureCtrl.Started += new EventHandler(CaptureCtrl_Started); 
 
         // subcribe to the media event for the player 
         _playCtrl.MediaEvent += new MediaEventHandler(PlayCtrl_MediaEvent); 
 
         // ready the capture graph in order to get the LNMetMux instance 
         _captureCtrl.ReadyCapture(CaptureMode.Video); 
 
         // get the network multiplexer reference 
         _pMux = _captureCtrl.GetSubObject(CaptureObject.TargetFilter) as LMNetMux; 
 
         if (_pMux != null) 
         { 
            // set some mux settings 
            _pMux.LiveSource = true; 
         } 
 
         // get the network sink reference 
         _pSink = _captureCtrl.GetSubObject(CaptureObject.Sink) as LMNetSnk; 
 
         if (_pSink != null) 
         { 
            // set some mux settings 
            _pSink.RequireLogin = true; 
            _pSink.UseEncryption = LMNetSnkLib.NetSnk_Encryption.NetSnk_Encryption_None; 
 
            // clear all user registrations 
            _pSink.RemoveAllUsers(); 
 
            // setup up user logins 
            AddModifyUsers(); 
 
            // enumeration users 
            EnumerateUsers(); 
 
            // add a restriction 
            AddRestriction(); 
 
            // test timer for connection checking 
            _serverAndClient.TestTimer.Interval = 10000; 
            _serverAndClient.TestTimer.Start(); 
            _serverAndClient.TestTimer.Tick += new EventHandler(ConnectionChecker); 
         } 
 
         // 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. 
         while (_captureCtrl.State == CaptureState.Running 
               || _playCtrl.State == PlayState.Running) 
         { 
            Application.DoEvents(); 
         } 
 
         // release the mux and demux COM objects 
         if (_pMux != null) 
            Marshal.ReleaseComObject(_pMux); 
 
         if (_pSink != null) 
            Marshal.ReleaseComObject(_pSink); 
      } 
   } 
   catch (Exception ex) 
   { 
      _result = false; 
   } 
} 
 
private void AddModifyUsers() 
{ 
   // early out if we could not get the sink interface 
   if (_pSink == null) 
      return; 
 
   // get the current connection list version 
   int oldVers = _pSink.ConnectionVersion; 
 
   // add a user 
   _pSink.AddUser("User1", "P12345"); 
 
   // get the current connection list version 
   int newVers = _pSink.ConnectionVersion; 
 
   // add another user 
   _pSink.AddUser("User2", "P67890"); 
 
   // find a user 
   int user1Id = _pSink.FindUser("User1"); 
 
   // set user 1's password -- was set above in the AddUser call 
   // but we will change it here for demonstration purposes 
   _pSink.SetPassword(user1Id, "P99999"); 
 
   // remove User2 from the registered users list  
   int user2Id = _pSink.FindUser("User2"); 
   _pSink.RemoveUser(user2Id); 
} 
 
private void EnumerateUsers() 
{ 
   // get the current user count 
   int userCount = _pSink.UserCount; 
 
   // verify that we have two users now 
   _result = (userCount == 1); 
 
   // demostrate enumeration registered users 
   for (int i = 0; i < userCount; i++) 
   { 
      // do something with user names and passwords 
      string userName = _pSink.GetUsername(i); 
      string passWord = _pSink.GetPassword(i); 
   } 
 
} 
 
private void AddRestriction() 
{ 
   // add a restriction to the client which has the IP = 10.0.0.5 
   // this will not allow a connection from this address.  
 
   // get number of restrictions 
   int oldRestCount = _pSink.RestrictionCount; 
 
   // Number of restrictions we have.  
   int restrictCount = _pSink.AddRestriction("10.0.0.5"); 
 
   // get number of restrictions 
   int newRestCount = _pSink.RestrictionCount; 
 
   // verify that we have a new restriction count 
   _result &= (oldRestCount != newRestCount); 
 
   // enumeration restrictions (demonstration purposes) 
   for (int i = 0; i < restrictCount; i++) 
   { 
      string restAddress = _pSink.GetRestriction(i); 
      // do something with Restriction 
   } 
 
   // find our restriction we added above 
   int restriction = _pSink.FindRestriction("10.0.0.5"); 
 
   // remove it 
   _pSink.RemoveRestriction(restriction); 
 
   // remove all restrictions (demonstration purposes) 
   _pSink.RemoveAllRestrictions(); 
} 
 
void CaptureCtrl_Started(object sender, EventArgs e) 
{ 
   StartClient(); 
} 
 
private void StartClient() 
{ 
   try 
   { 
      // connect a client 
      _playCtrl.SourceFile = _networkAuthenticatedUrl; 
   } 
   catch (Exception ex) 
   { 
      _result = false; 
      Console.WriteLine("Player (Client) Exception: {0}", ex.Message); 
   } 
} 
 
void ConnectionChecker(object sender, EventArgs e) 
{ 
   _serverAndClient.TestTimer.Stop(); 
 
   // get number of users connected to the server 
   int connCount = _pSink.ConnectionCount; 
 
   // get the first connection (demonstration purposes) 
   ILMNetSnkConnection pcon = _pSink.FindConnection(1); 
   // release it -- it is a COM object you know! 
   Marshal.ReleaseComObject(pcon); 
 
   // get the first connection 
   pcon = _pSink.FirstConnection; 
 
   // check all connections with the server 
   while (pcon != null) 
   { 
      ILMNetSnkConnection pnext = pcon.NextConnection; 
      long id = pcon.ID; 
      string userName = pcon.Username; 
      string connAddr = pcon.Address; 
 
      // check if connection is enabled or not 
      // it should be, we just enabled it above 
      bool enabled = pcon.Enabled; 
 
      // is it connected 
      bool connected = pcon.Connected; 
 
      // check if this connection is disabled 
      // and disconnect it if so 
      if (enabled == false) 
      { 
         // close this connection 
         pcon.Close(); 
      } 
      Marshal.ReleaseComObject(pcon); 
      pcon = pnext; 
   } 
 
   // close all connections (demonstration purposes) 
   _pSink.CloseAll(); 
 
   _serverAndClient.TestTimer.Start(); 
} 
 
private void PlayCtrl_MediaEvent(object sender, MediaEventArgs e) 
{ 
   if (e.eventCode == MediaEventCode.EC_COMPLETE) 
      _result &= true; 
} 
Requirements

Target Platforms

Help Version 22.0.2022.12.7
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Products | Support | Contact Us | Intellectual Property Notices
© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.