我遇到通过串口接收数据的问题。
当我启动软件后打开设备时，我可以正确接收它。
但是，如果我这样做，反过来我得到一个错误，因为它捕获了中途收到的字符串。而且我不确定如何正确过滤它。
我接收数据的代码如下。
_serialPort = new SerialPort
{
PortName = comboBox1.Text,
BaudRate = BaudRate,
DataBits = 8,
Parity = Parity.None,
StopBits = StopBits.One,
RtsEnable = true,
DtrEnable = false,
WriteBufferSize = 2048,
ReadBufferSize = 2048,
ReceivedBytesThreshold = 13,
ReadTimeout = 5000,
};
_serialPort.DataReceived += SerialPortOnDataReceived; //<-- this event happens everytime when new data is received by the ComPort
_serialPort.Open(); //<-- make the comport listen
textBox1.Text = "Listening on " + _serialPort.PortName + "...\r\n";
}
private delegate void Closure();
private void SerialPortOnDataReceived(object sender, SerialDataReceivedEventArgs serialDataReceivedEventArgs)
{
if (InvokeRequired) //<-- Makes sure the function is invoked to work properly in the UI-Thread
BeginInvoke(new Closure(() => { SerialPortOnDataReceived(sender, serialDataReceivedEventArgs); })); //<-- Function invokes itself
else
{
// int dataLength = 11;
//int dataLength = _serialPort.BytesToRead;
byte[] data = new byte[13];
int nbrDataRead = _serialPort.Read(data, 0, 13);
if (nbrDataRead == 0)
return;
str = System.Text.Encoding.UTF8.GetString(data);
WriteLog2();
}
}private void WriteLog2()
{
string path3 = @"c:\Scale Logs\Current Logs";
string path4 = @"c:\Scale Logs\Current Logs\temp Log2.txt";
bool folderExists = Directory.Exists(path3);
if (!folderExists)
Directory.CreateDirectory(path3);
if (!File.Exists(path4))
{
File.Create(path4);
using (var tw2 = new StreamWriter(path4, true))
{
if (ammountoflines < 10)
{
tw2.WriteLine();
// tw2.WriteLine(str);
tw2.WriteLine(str);
tw2.WriteLine();
tw2.Close();
ammountoflines = ammountoflines + 1;
//averageweight = averageweight + weight;
}
else
{
tw2.Close();
averageweight = (averageweight / 10);
System.IO.File.WriteAllText(@"c:\Scale Logs\Current Logs\temp Log2.txt", string.Empty);
ammountoflines = 0;
ready = "no";
}
}
}
else if (File.Exists(path4))
{
using (var tw2 = new StreamWriter(path4, true))
{
if (ready == "no")
{
str = str.Replace("k", string.Empty);
str = str.Replace("g", string.Empty);
// str = str.Replace("0", string.Empty);
str = str.Replace("W", string.Empty);
str = str.Replace("G", string.Empty);
str = str.Replace(".", string.Empty);
str = str.Replace("\r\n", string.Empty);
if (Convert.ToInt32(str) < 1000 )
{
ready = "yes";
}
}
else
{
//if (ammountoflines < 3)
str = str.Replace("k", string.Empty);
str = str.Replace("g", string.Empty);
// str = str.Replace("0", string.Empty);
str = str.Replace("W", string.Empty);
str = str.Replace("G", string.Empty);
str = str.Replace(".", string.Empty);
str = str.Replace("\r\n", string.Empty);
//MessageBox.Show(str);
//weight = Convert.ToInt32(str);
//MessageBox.Show(Convert.ToString(weight));
label3.Text = str;
weight = Convert.ToInt32(str);
if (weight > 1000)
{
if (weight < 3500)
{
tw2.WriteLine(str);
tw2.Close();
ammountoflines = ammountoflines + 1;
averageweight = weight;
ave = (decimal)averageweight / 100;
WriteLog();
//System.IO.File.WriteAllText(@"c:\Scale Logs\Current Logs\temp Log2.txt", string.Empty);
}
}
else
{
}
}
}
}
}
我收到的字符串是WG00000.0kg。如果在软件启动后打开设备，它可以正常工作。但如果它反过来我会得到一个完全混乱的字符串。
有没有办法在WG启动之前不读取数据？问题是由设备连续发送数据引起的。而且不仅在被触发时。所以我中途赶上了小溪。