Chat program based on TCP communication Breeze IM (C # Open source)-Technical Analysis (iii) client Downline

In Breeze IM, when a client goes offline, other clients can perceive that the user is offline and turn their avatar icon Gray.

Perceptual connection Drop, is the NETWORKCOMMS framework built-in functionality, the server through heartbeat detection of a connection dropped, will be maintained from the NETWORKCOMMS internal connection list to remove the connection, and trigger the corresponding delegate.

We're going to handle a connection drop, just register the Networkcomms.appendglobalconnectionclosehandler method to

The server-side code is as follows:

  // If a client is offline, this method            is triggered Networkcomms.appendglobalconnectionclosehandler (handleconnectionclosed);

Processing method of a client's offline user

  //handling a client offline situation        Private voidhandleconnectionclosed (Connection Connection) {Try            {                               varTempuserid =""; Lock(synclocker) {//find the user ID corresponding to the network connection in the user dictionary                    foreach(varKvinchUsermanager) {                        //If you are shutting down a network connection that is the same as a user's network connection, locate the user                        if(KV. Value = =connection.ConnectionInfo.NetworkIdentifier) {Tempuserid=KV.                            Key;  Break; }                    }                    if(Tempuserid! ="")                    {                        //if the found user ID is not empty, the item is removed from the user dictionary                        if(Usermanager.containskey (Tempuserid)) {//When the connection is closed, remove the user from the User ManagerUsermanager.remove (Tempuserid); }                    }                }                //send notifications to other clients informing them of a user's downline                if(Tempuserid! ="") {userstatenotify (Tempuserid,false); }                //a message should be sent to all other users online            }            Catch(Exception ex) {logtools.logexception (ex,"networkcomms_connectionclosed"); }        }

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Chat program based on TCP communication Breeze IM (C # Open source)-Technical Analysis (iii) client Downline