Code security and fix bug

Author: GermanAizek

p2pconn/StreamingDesktop/RemoteDesktop.cs

@@ -161,9 +161,10 @@ private static void  GetCursorState()
                 if (GetCursorInfo(out pci))
                 {
                     IntPtr htcursor = pci.hCursor;
-                    Cursor micursor = null;
-                    micursor = new Cursor(htcursor);
-                    Tipo = micursor.ToString();
+                    using (var micursor = new Cursor(htcursor))
+                    {
+                        Tipo = micursor.ToString();
+                    }
                 }
             }
             catch // (Exception ex)

p2pconn/StreamingDesktop/ScreenCaptureStream.cs

@@ -370,9 +370,10 @@ private void WorkerThread( )
                 catch ( Exception exception )
                 {
                     // provide information to clients
-                    if ( VideoSourceError != null )
+                    VideoSourceErrorEventHandler videoSrcHandler = VideoSourceError;
+                    if ( videoSrcHandler != null )
                     {
-                        VideoSourceError( this, new VideoSourceErrorEventArgs( exception.Message ) );
+                        videoSrcHandler( this, new VideoSourceErrorEventArgs( exception.Message ) );
                     }
                     // wait for a while before the next try
                     Thread.Sleep( 250 );
@@ -387,9 +388,10 @@ private void WorkerThread( )
             graphics.Dispose( );
             bitmap.Dispose( );
 
-            if ( PlayingFinished != null )
+            PlayingFinishedEventHandler handler = PlayingFinished;
+            if ( handler != null )
             {
-                PlayingFinished( this, ReasonToFinishPlaying.StoppedByUser );
+                handler( this, ReasonToFinishPlaying.StoppedByUser );
             }
         }
     }

p2pconn/UdtSharpLib/Queue.cs

@@ -735,7 +735,7 @@ static void worker(object param)
                 ulong ctime = currtime - 100000 * Timer.getCPUFrequency();
                 for (int i = 0; i < self.m_pRcvUList.m_nodeList.Count; ++i)
                 {
-                    RNode ul = self.m_pRcvUList.m_nodeList[0];
+                    RNode ul = self.m_pRcvUList.m_nodeList[i];
                     if (ul.m_llTimeStamp >= ctime)
                         break;
 

p2pconn/UdtSharpLib/UdtSocket.cs

@@ -67,8 +67,6 @@ public UdtSocket Accept()
             {
                 IPEndPoint clientEndPoint = null;
                 int clientSocketId = UDT.s_UDTUnited.accept(mSocketId, ref clientEndPoint);
-                if (clientSocketId == UDT.INVALID_SOCK)
-                    return null;
 
                 return new UdtSocket(clientSocketId, clientEndPoint, mLocalEndPoint);
             }