C # Use DataReceived to receive serial port data in hexadecimal format)

Private void Form1_Load (object sender, EventArgs e)
{
SerialPort1.PortName = "COM1 ";
SerialPort1.BaudRate = 9600;
SerialPort1.DataBits = 8; // data bit
SerialPort1.Parity = System. IO. Ports. Parity. None; // No Parity bit
SerialPort1.StopBits = System. IO. Ports. StopBits. One; // a stop bit
SerialPort1.ReadBufferSize = 1024; // size of the receiving buffer
SerialPort1.Encoding = Encoding. BigEndianUnicode;
If (serialPort1.IsOpen)
{
SerialPort1.Close ();
}
TextChanged + = new UpdateTextEventHandler (ChangeText); // Add the event handling method to the event, which is indispensable
Try
{
SerialPort1.Open ();
}
Catch (System. Exception ex)
{
MessageBox. Show (string. Format ("failed to open the serial port. Please check whether it is connected. \ N "+ ex. Message ));
Return;
}
}

Public static string ByteToHexStr (byte [] bytes) // function, convert byte array to hexadecimal string
{
String returnStr = "";
If (bytes! = Null)
{
For (int I = 0; I <bytes. Length; I ++)
{
ReturnStr + = bytes [I]. ToString ("X2 ");
}
}
Return returnStr;
}

Private delegate void UpdateTextEventHandler (string text); // defines the delegate

Private event UpdateTextEventHandler textChanged; // defines the event

Private void ChangeText (string text) // event handling method www.2cto.com
{
String text1 = string. Empty;
Text1 = text. Trim (). Substring (10, 1 );
String s1 = string. Empty;
S1 = text. Trim (). Substring (10, 4 );
Int dec1 = Convert. ToInt32 (s1, 16); // enter 10 for the s1 segment.
If (text1 = "0") // Delete 10
{
Decimal dda1 = Math. Round (decimal) dec1/10, 1); // save one small number except 10.
TextBox5.Text = dda1.ToString (CultureInfo. InvariantCulture). Trim ();
}
Else // xor ffff
{
Int d1 = (dec1 ^ Convert. ToInt32 ("FFFF", 16) + 1;
Decimal dd1 = Math. Round (decimal) d1/10, 1); // save one small number except 10.
TextBox5.Text = dd1.ToString (CultureInfo. InvariantCulture). Trim ();
}

String s2 = text. Trim (). Substring (14, 4 );
Int d2 = Convert. ToInt32 (s2, 16); // s2 returns 10 bytes.
Decimal dd2 = Math. Round (decimal) d2/10, 2); // save one small number except 10.
TextBox6.Text = dd2.ToString (CultureInfo. InvariantCulture). Trim ();

String text3 = text. Trim (). Substring (18, 1 );
String s3 = text. Trim (). Substring (18, 4 );
Int dec3 = Convert. ToInt32 (s3, 16); // s3 returns 10 bytes
If (text3 = "0 ")
{
Decimal dda3 = Math. Round (decimal) dec3/10, 1); // save one small number except 10.
TextBox7.Text = dda3.ToString (CultureInfo. InvariantCulture). Trim ();
}
Else // xor ffff
{
Int d3 = (dec3 ^ Convert. ToInt32 ("FFFF", 16) + 1;
Decimal dd3 = Math. Round (decimal) d3/10, 1); // save one small number except 10.
TextBox7.Text = string. Format ("-{0}", dd3.ToString (CultureInfo. InvariantCulture). Trim ());
}
}

Private void serialPort1_DataReceived (object sender, System. IO. Ports. SerialDataReceivedEventArgs e)
{
Thread. Sleep (100); // reading speed is too slow. Adding Sleep to extend the reading time is indispensable.
SerialPort1.Read (buffer, 0, buffersize );
// String text = Encoding. ASCII. GetString (buffer); // ASCII card code
String txt = ByteToHexStr (buffer); // use a function to convert hexadecimal data.
SerialPort1.DiscardInBuffer ();
This. Invoke (textChanged, new string [] {txt}); // call the event through Invoke
}

 

From brian0031