Question

I am attempting to create a small application to collect data received from an external sensor attached to COM10. I have successfully created a small C# console object and application that opens the port and streams data to a file for a fixed period of time using a for-loop.

I would like to convert this application to use the dataReceived event to stream instead. After reading the Top 5 SerialPort Tips, I still can’t seem to get this to work and don’t know what I am missing. I rewrote the console application so that all the code is in Main and is pasted below. Can someone please help enlighten me as to why the event handler port_OnReceiveDatazz is not being called even though I know that there is data being sent to the port by the hardware?

Thanks

Thanks to @Gabe, @Jason Down, and @abatishchev for all the suggestions. I am stumped and can’t seem to get the event handler to work. Perhaps it has something to do with the device. I can live with just reading the port in a thread and streaming the data straight to file.

---

Code

---

namespace serialPortCollection {   class Program     {         static void Main(string[] args)         {                          const int bufSize = 2048;             Byte[] buf = new Byte[bufSize]; //To store the received data.              SerialPort sp = new SerialPort("COM10", 115200);             sp.DataReceived += port_OnReceiveDatazz; // Add DataReceived Event Handler              sp.Open();             sp.WriteLine("$"); //Command to start Data Stream              // Wait for data or user input to continue.             Console.ReadLine();                         sp.WriteLine("!"); //Stop Data Stream Command             sp.Close();         }                 // My Event Handler Method         private static void port_OnReceiveDatazz(object sender,                                     SerialDataReceivedEventArgs e)         {             SerialPort spL = (SerialPort) sender;             const int bufSize = 12;             Byte[] buf = new Byte[bufSize];             Console.WriteLine("DATA RECEIVED!");             Console.WriteLine(spL.Read(buf, 0, bufSize));         }     } } 

Answer 1

I think your issue is the line:**

sp.DataReceived += port_OnReceiveDatazz;

Shouldn’t it be:

sp.DataReceived += new SerialDataReceivedEventHandler (port_OnReceiveDatazz);

**Nevermind, the syntax is fine (didn’t realize the shortcut at the time I originally answered this question).

I’ve also seen suggestions that you should turn the following options on for your serial port:

sp.DtrEnable = true;    // Data-terminal-ready sp.RtsEnable = true;    // Request-to-send 

You may also have to set the handshake to RequestToSend (via the handshake enumeration).

---

UPDATE:

Found a suggestion that says you should open your port first, then assign the event handler. Maybe it’s a bug?

So instead of this:

sp.DataReceived += new SerialDataReceivedEventHandler (port_OnReceiveDatazz); sp.Open(); 

Do this:

sp.Open(); sp.DataReceived += new SerialDataReceivedEventHandler (port_OnReceiveDatazz); 

Let me know how that goes.