Then, a socket is created and an end point established. Note that, although this code attempts a non-blocking connection the connection will block until the remote PC name is resolved into an IP address. ![]() #Coolterm connection says clientclientclient code To avoid this it’s better to use the IPV4 address instead of the DNS Hostname of the server. MessageBox.Show( this, ex.Message, "Unknown error on Connect!" ) MessageBox.Show( this, "Unable to connect to remote PC", "Connect Failed!" ) The following method is called once the connection attempt is complete, it displays connection error or sets up the receive data callback if successful. } FIG.3: Handle connection attempt TOP RECEIVE DATA To receive data asynchronously, it is necessary to setup an AsyncCallback to handle events triggered by the socket such as new data and loss of connection. MessageBox.Show( this, ex.Message, "Setup Recieve Callback failed!" ) Sock.BeginReceive( m_byBuff, 0, m_byBuff.Length, SocketFlags.None, recieveData, sock ) This is done by using the following method: public void SetupRecieveCallback( Socket sock )ĪsyncCallback recieveData = new AsyncCallback( OnRecievedData ) ![]() String sRecieved = ( m_byBuff, 0, nBytesRec ) It also passes a buffer for the receive data to be inserted into: public void OnRecievedData( IAsyncResult ar ) The SetupRecieveCallback method starts a BeginReceive using a delegate pointing to the OnReceveData method that follows. Invoke( m_AddMessage, new string FIG.6: Create AddMessage delegate TOP FORMAT DATA WARNING : The following line is NOT thread safe. When data is received or is to be sent the data is held in an array of 8 bit bytes. This data must be encoded to a format suitable for. NET when received and a format suitable for the receiving application when sent. To test the program you can follow these steps: C# uses a multi-byte (MBCS) character encoding internally so data must be converted to that when it is received and before it is sent out using the Encoding.ASCII or Encoding.UNICODE static methods as necessary. Setup a simple instance of CNCnetPDM with two devices (number 10) that just output states and part counts as described in section ‘Configure CNCnetPDM’ of ‘MTConnect Getting Started’ on your PC and let it run.#Coolterm connection says clientclientclient Pc Build the C-Sharp client and run it on your PC.You can also run the compiled program from the Debug folder. ![]() If you leave IP Address (1) and Port (2) at its default settings and click the program first outputs state number and part count for each machine.
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