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C#串口接收数据

private void spRun_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
strReceive = spRun.ReadExisting();
showdata(strReceive);
}
public void showdata(string sdata)
{
if (txtReceive.InvokeRequired)
{
MyInvoke _myInvoke = new MyInvoke(showdata);
this.Invoke(_myInvoke, new object[] { sdata });
}
else
{
this.txtReceive.Text = sdata;
}
}







string serialReadString;
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
serialReadString = serialPort1.ReadExisting();
this.rTB_receive.Invoke
(
new MethodInvoker
(

delegate
{

this.rTB_receive.AppendText(serialReadString);
}

)

);

}









在我的测试软件中发现一个问题,就是当发送数据小于或等于8位时,一切正常,如果大于8为字节,则在datareceived事件中接收到的数据会分成两段,第一段为8位,第二段为剩下的字节,很奇怪,在msdn中讲到不能保证每次发送的数据都能正确接收到,需要参照BytesToRead属性来确定要读取的数据量,所以我想出来的解决办法为:

int DataLength=serialPort.BytesToRead;

int i=0;

StringBuilder sb=new StringBuilder();

while(i
{

byte[] ds=new byte[1024];

int len=serialPort.Read(ds,0,1024);

sb.Append(Encoding.Ascii.GetString(ds,0,len));

i+=len;

}

Console.Write(sb,ToString());







































private string StringToHexString(string s,Encoding encode)
{
byte[] b = encode.GetBytes(s);//按照指定编码将string编程字节数组
string result = string.Empty;
for (int i = 0; i < b.Length; i++)//逐字节变为16进制字符,以%隔开
{
result += "%"+Convert.ToString(b[i], 16);
}
return result;
}
private string HexStringToString(string hs, Encoding encode)
{
//以%分割字符串,并去掉空字符
string[] chars = hs.Split(new char[]{'%'},StringSplitOptions.RemoveEmptyEntries);
byte[] b = new byte[chars.Length];
//逐个字符变为16进制字节数据
for (int i = 0; i < chars.Length; i++)
{
b[i] = Convert.ToByte(chars[i], 16);
}
//按照指定编码将字节数组变为字符串
return encode.GetString(b);
}


字符串转16进制字节数组

///


/// 字符串转16进制字节数组
///

///
///
private static byte[] strToToHexByte(string hexString)
{
hexString = hexString.Replace(" ", "");
if ((hexString.Length % 2) != 0)
hexString += " ";
byte[] returnBytes = new byte[hexString.Length / 2];
for (int i = 0; i < returnBytes.Length; i++)
returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
return returnBytes;
}


字节数组转16进制字符串
///
/// 字节数组转16进制字符串
///

///
///
public static string byteToHexStr(byte[] bytes)
{
string returnStr = "";
if (bytes != null)
{
for (int i = 0; i < bytes.Length; i++)
{
returnStr += bytes[i].ToString("X2");
}
}
return returnStr;
}


从汉字转换到16进制
///
/// 从汉字转换到16进制
///

///
/// 编码,如"utf-8","gb2312"
/// 是否每字符用逗号分隔
///
public static string ToHex(string s, string charset, bool fenge)
{
if ((s.Length % 2) != 0)
{
s += " ";//空格
//throw new ArgumentException("s is not valid chinese string!");
}
System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
byte[] bytes = chs.GetBytes(s);
string str = "";
for (int i = 0; i < bytes.Length; i++)
{
str += string.Format("{0:X}", bytes[i]);
if (fenge && (i != bytes.Length - 1))
{
str += string.Format("{0}", ",");
}
}
return str.ToLower();
}


16进制转换成汉字
///
/// 从16进制转换成汉字
///

///
/// 编码,如"utf-8","gb2312"
///
public static string UnHex(string hex, string charset)
{
if (hex == null)
throw new ArgumentNullException("hex");
hex = hex.Replace(",", "");
hex = hex.Replace("\n", "");
hex = hex.Replace("\\", "");
hex = hex.Replace(" ", "");
if (hex.Length % 2 != 0)
{
hex += "20";//空格
}
// 需要将 hex

转换成 byte 数组。
byte[] bytes = new byte[hex.Length / 2];

for (int i = 0; i < bytes.Length; i++)
{
try
{
// 每两个字符是一个 byte。
bytes[i] = byte.Parse(hex.Substring(i * 2, 2),
System.Globalization.NumberStyles.HexNumber);
}
catch
{
// Rethrow an exception with custom message.
throw new ArgumentException("hex is not a valid hex number!", "hex");
}
}
System.Text.Encoding chs = System.Text.Encoding.GetEncoding(charset);
return chs.GetString(bytes);
}

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