Terminate Serial Recieved Data Handler

Question

Hi. I am receiving data from a serial port but there is no command in the data to state that the message has ended therefore my code is just hanging in the data deceived handler and timing out. My question is is there a way which i can terminate the handler once i have receiving a certain piece of data or character? I am currently using the below code to read data from the serial port. Due to the serial port connection i am unable to use readline() or read existing() instead i read the data by readbytes. private void serial_DataReceived(object sender System.IO.Ports.SerialDataReceivedEventArgs e) { try { //Initialize a buffer to hold the received data byte[] buffer = new byte[sp.ReadBufferSize]; //There is no accurate method for checking how many bytes are read //unless you check the return from the Read method try { int bytesRead = sp.Read(buffer 0 buffer.Length); } catch { } //data we are received is ASCII data. tString += Encoding.ASCII.GetString(buffer 0 buffer.Length); //Check if string contains the terminator if (tString.IndexOf((char)_terminator) > -1) { //If tString does contain terminator we cannot assume that it is the last character received string workingString = tString.Substring(0 tString.IndexOf((char)_terminator)); //Remove the data up to the terminator from tString tString = tString.Substring(tString.IndexOf((char)_terminator)); // MessageBox.Show(workingString); sp.DiscardOutBuffer(); sp.DiscardInBuffer(); tString = ; ProcessSerialBuffer(workingString); localStatus = Aknowledgement Recieved; } // we then pass the buffer value to the process serial buffer method. } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } I welcome any ideas or suggestions many thanks.

Nirav Daraniya · Answer

First of all you have to show me what type of data you will get continues then I define logic base on it.. here I take sample data from my side 000000 @123.56 000000 @123.57 000000 @123.58 000000 here in above data you have to take only 123.56 means after @ value if this data is continues coming from the serial port then ************ Code Start *********************** string strData = null; private void serial_DataReceived(object sender SerialDataReceivedEventArgs e) { try { byte[] buffer = new byte[cmPort.ReadBufferSize]; try { int bytesRead = cmPort.Read(buffer 0 buffer.Length); } catch { } strData = Encoding.ASCII.GetString(buffer 0 buffer.Length); //******************************************** //If you want to use ReadExisting function then its more easy to understant. //strData = cmPort.ReadExisting(); //******************************************** SetLength(strData); } catch (Exception ex) { MessageBox.Show(ex.Message); } } private System.Windows.Forms.TextBox TbRead; public void SetLength(string text) { this.TbRead.AppendText(text); if (TbRead.Text.IndexOf(000000) > 13) // here we take 000000 because this string is repeat every time so and we use13 because length od string 000000@123.56 is 13 so.... { string yourdata = TbRead.Text.Substring(TbRead.Text.IndexOf(000000) + 7 6); TbRead.Text = ; MessageBox.Show(yourdata); } } ********************** Code End ************************** if you have any query the type in comments...