用C＃读取GPS数据的基类，适用于wince操作系统[6]

  public string DM2DD(string DegreeMinutes)
  {
   //转换NMEA协议的“度分”格式为十进制“度度”格式
   string sDegree;
   string sMinute;
   string sReturn="";
   if(DegreeMinutes.IndexOf(".")==4)
   {
    //DegreeMinutes = Replace(DegreeMinutes, ".", "")
    //DM2DD = CDbl(Left(DegreeMinutes, 2)) + CDbl(Left(CStr(CDbl(Right(DegreeMinutes, Len(DegreeMinutes) - 2)) / 60), 8)) / 10000
    DegreeMinutes=DegreeMinutes.Replace(".","");
    double sDegree1=Convert.ToDouble(DegreeMinutes.Substring(0,2));
    double sDegree2=Convert.ToDouble(DegreeMinutes.Substring(2,DegreeMinutes.Length-2));
    string sTmp=Convert.ToString(sDegree2/60);
    sDegree2=Convert.ToDouble(sTmp.Substring(0,sTmp.Length));
    sDegree2=sDegree2/10000;
    sDegree=Convert.ToString(sDegree1+sDegree2);
    if(sDegree.Length>11)
     sDegree=sDegree.Substring(0,11);
    sReturn=sDegree;
   }
   else if(DegreeMinutes.IndexOf(".")==5)
   {
    //DegreeMinutes = Replace(DegreeMinutes, ".", "")
    //DM2DD = CDbl(Left(DegreeMinutes, 2)) + CDbl(Left(CStr(CDbl(Right(DegreeMinutes, Len(DegreeMinutes) - 2)) / 60), 8)) / 10000
    DegreeMinutes=DegreeMinutes.Replace(".","");
    double sMinute1=Convert.ToDouble(DegreeMinutes.Substring(0,3));
    double sMinute2=Convert.ToDouble(DegreeMinutes.Substring(3,DegreeMinutes.Length-2));
    string sTmp=Convert.ToString(sMinute2/60);
    sMinute2=Convert.ToDouble(sTmp.Substring(0,sTmp.Length));
    sMinute2=sMinute2/10000;
    sMinute=Convert.ToString(sMinute1+sMinute2);
    if(sMinute.Length>10)
     sMinute=sMinute.Substring(0,10);
    sReturn=sMinute;
   }
   return sReturn;
  }

  public bool ScanPort()
  {
   
   try
   {
    if (Opened)
    {
     Close();
     Open();
    }
    else
    {
     Open();//打开串口
     
    }
    byte[] bytRead=Read(512);
    Close();
    if(Encoding.ASCII.GetString(bytRead,0,bytRead.Length).IndexOf("$GP")>=0)
     return true;
    else
     return false;
   }
   catch
   {
    return false;
   }

  }
 }

 class HexCon
 {
  // 把十六进制字符串转换成字节型和把字节型转换成十六进制字符串 converter hex string to byte and byte to hex string
  public static string ByteToString(byte[] InBytes)
  {
   string StringOut="";
   foreach (byte InByte in InBytes)
   {
    StringOut=StringOut + String.Format("{0:X2} ",InByte);
   }
   return StringOut;
  }
  public static byte[] StringToByte(string InString)
  {
   string[] ByteStrings;
   ByteStrings = InString.Split(" ".ToCharArray());
   byte[] ByteOut;
   ByteOut = new byte[ByteStrings.Length-1];
   for (int i = 0;i==ByteStrings.Length-1;i++)
   {
    ByteOut[i] = Convert.ToByte(("0x" + ByteStrings[i]));
   }
   return ByteOut;
  }
 }
}

在别的class中调用时如Frmlogoin(是通过一个时间控件来循环的)

public class Frmlogin : System.Windows.Forms.Form
 {

private GPS ss_port=new GPS();

}