private void COMDataHandler(object sender, EventArgs e)
{
if (port_isopen == false)
{
return;
}
try
{
listening = 1;
SerialPort sp = (SerialPort)sender;
int counter = 0;
counter = sp.BytesToRead;
byte[] buf = new byte[counter];
sp.Read(buf, 0, counter);
int err = 0;
setlabel(this.status, "Communicationing");
foreach (byte n in buf)
{
buffer.Add(n);
}
//String strr = System.Text.Encoding.Default.GetString(buf);
//charfrm.Set_RXBox_Text(strr);
while (buffer.Count >= 4)
{
//2.1 Find Header
if (buffer[0] == 0x58 && buffer[1] == 0x5A) //传输数据有帧头，用于判断
{
int len = buffer[2];
if (buffer.Count < len) //数据区尚未接收完整
{
break;
}
else
{
//Got full data, Copy to ReceiveBytes to verify.
buffer.CopyTo(0, ReceiveBytes, 0, len);
buffer.RemoveRange(0, len);
//if(ReceiveBytes[len -3 ] == this.FCS(ReceiveBytes,len)) //Verify FCS Verify Confirmed.
{
cm.GetSerialData(ReceiveBytes);
}
}
}
else //帧头不正确时，记得清除
{
buffer.RemoveAt(0);
err = 1;
if (buffer[0] == 0x58)
{
err = 0;
}
if (buf[0] == 'X')
{
err = 0;
}
}
}
if (err == 1)
{
String str = System.Text.Encoding.Default.GetString(buf);
charfrm.Set_RXBox_Text(str);
//charfrm.Set_RXBox_Text(buf, counter);
}
}
finally
{
listening = 0;
}
}