用C＃读取GPS数据的基类，适用于wince操作系统

using System; using System.Runtime.InteropServices; using System.Text; namespace BaseStationPDA { class GPS { public string PortNum; public int BaudRate; public byte ByteSize; public byte Parity; // 0-4=no,odd,even,mark,space public byte StopBits; // 0,1,2 = 1, 1.5, 2 public int ReadTimeout; //comm port win32 file handle private int hComm = -1; public bool Opened = false; //win32 api constants private const uint GENERIC_READ = 0x80000000; private const uint GENERIC_WRITE = 0x40000000; private const int OPEN_EXISTING = 3; private const int INVALID_HANDLE_VALUE = -1; [StructLayout(LayoutKind.Sequential)] public struct DCB { //taken from c struct in platform sdk public int DCBlength; // sizeof(DCB) public int BaudRate; // 指定当前波特率 current baud rate // these are the c struct bit fields, bit twiddle flag to set public int fBinary; // 指定是否允许二进制模式,在windows95中必须主TRUE binary mode, no EOF check public int fParity; // 指定是否允许奇偶校验 enable parity checking public int fOutxCtsFlow; // 指定CTS是否用于检测发送控制，当为TRUE是CTS为OFF，发送将被挂起。 CTS output flow control public int fOutxDsrFlow; // 指定CTS是否用于检测发送控制 DSR output flow control public int fDtrControl; // DTR_CONTROL_DISABLE值将DTR置为OFF, DTR_CONTROL_ENABLE值将DTR置为ON, DTR_CONTROL_HANDSHAKE允许DTR"握手" DTR flow control type public int fDsrSensitivity; // 当该值为TRUE时DSR为OFF时接收的字节被忽略 DSR sensitivity public int fTXContinueOnXoff; // 指定当接收缓冲区已满,并且驱动程序已经发送出XoffChar字符时发送是否停止。TRUE时，在接收缓冲区接收到缓冲区已满的字节XoffLim且驱动程序已经发送出XoffChar字符中止接收字节之后，发送继续进行。　FALSE时，在接收缓冲区接收到代表缓冲区已空的字节XonChar且驱动程序已经发送出恢复发送的XonChar之后，发送继续进行。XOFF continues Tx public int fOutX; // TRUE时，接收到XoffChar之后便停止发送接收到XonChar之后将重新开始 XON/XOFF out flow control public int fInX; // TRUE时，接收缓冲区接收到代表缓冲区满的XoffLim之后，XoffChar发送出去接收缓冲区接收到代表缓冲区空的XonLim之后，XonChar发送出去 XON/XOFF in flow control public int fErrorChar; // 该值为TRUE且fParity为TRUE时，用ErrorChar 成员指定的字符代替奇偶校验错误的接收字符 enable error replacement public int fNull; // eTRUE时，接收时去掉空（0值）字节 enable null stripping public int fRtsControl; // RTS flow control /*RTS_CONTROL_DISABLE时,RTS置为OFF RTS_CONTROL_ENABLE时, RTS置为ON RTS_CONTROL_HANDSHAKE时, 当接收缓冲区小于半满时RTS为ON 当接收缓冲区超过四分之三满时RTS为OFF RTS_CONTROL_TOGGLE时, 当接收缓冲区仍有剩余字节时RTS为ON ,否则缺省为OFF*/ public int fAbortOnError; // TRUE时,有错误发生时中止读和写操作 abort on error public int fDummy2; // 未使用 reserved public uint flags; public ushort wReserved; // 未使用,必须为0 not currently used public ushort XonLim; // 指定在XON字符发送这前接收缓冲区中可允许的最小字节数 transmit XON threshold public ushort XoffLim; // 指定在XOFF字符发送这前接收缓冲区中可允许的最小字节数 transmit XOFF threshold public byte ByteSize; // 指定端口当前使用的数据位 number of bits/byte, 4-8 public byte Parity; // 指定端口当前使用的奇偶校验方法,可能为:EVENPARITY,MARKPARITY,NOPARITY,ODDPARITY 0-4=no,odd,even,mark,space public byte StopBits; // 指定端口当前使用的停止位数,可能为:ONESTOPBIT,ONE5STOPBITS,TWOSTOPBITS 0,1,2 = 1, 1.5, 2 public char XonChar; // 指定用于发送和接收字符XON的值 Tx and Rx XON character public char XoffChar; // 指定用于发送和接收字符XOFF值 Tx and Rx XOFF character public char ErrorChar; // 本字符用来代替接收到的奇偶校验发生错误时的值 error replacement character public char EofChar; // 当没有使用二进制模式时,本字符可用来指示数据的结束 end of input character public char EvtChar; // 当接收到此字符时,会产生一个事件 received event character public ushort wReserved1; // 未使用 reserved; do not use } [StructLayout(LayoutKind.Sequential)] private struct COMMTIMEOUTS { public int ReadIntervalTimeout; public int ReadTotalTimeoutMultiplier; public int ReadTotalTimeoutConstant; public int WriteTotalTimeoutMultiplier; public int WriteTotalTimeoutConstant; } [StructLayout(LayoutKind.Sequential)] private struct OVERLAPPED { public int Internal; public int InternalHigh; public int Offset; public int OffsetHigh; public int hEvent; } [DllImport("coredll.dll")] private static extern int CreateFile( string lpFileName, // 要打开的串口名称 uint dwDesiredAccess, // 指定串口的访问方式，一般设置为可读可写方式 int dwShareMode, // 指定串口的共享模式，串口不能共享，所以设置为0 int lpSecurityAttributes, // 设置串口的安全属性，WIN9X下不支持，应设为NULL int dwCreationDisposition, // 对于串口通信，创建方式只能为OPEN_EXISTING int dwFlagsAndAttributes, // 指定串口属性与标志，设置为FILE_FLAG_OVERLAPPED(重叠I/O操作)，指定串口以异步方式通信 int hTemplateFile // 对于串口通信必须设置为NULL ); [DllImport("coredll.dll")] private static extern bool GetCommState( int hFile, //通信设备句柄 ref DCB lpDCB // 设备控制块DCB ); [DllImport("coredll.dll")] private static extern bool BuildCommDCB( string lpDef, // 设备控制字符串 ref DCB lpDCB // 设备控制块 ); [DllImport("coredll.dll")] private static extern bool SetCommState( int hFile, // 通信设备句柄 ref DCB lpDCB // 设备控制块 ); [DllImport("coredll.dll")] private static extern bool GetCommTimeouts( int hFile, // 通信设备句柄 handle to comm device ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values ); [DllImport("coredll.dll")] private static extern bool SetCommTimeouts( int hFile, // 通信设备句柄 handle to comm device ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values ); [DllImport("coredll.dll")] private static extern bool ReadFile( int hFile, // 通信设备句柄 handle to file byte[] lpBuffer, // 数据缓冲区 data buffer int nNumberOfBytesToRead, // 多少字节等待读取 number of bytes to read ref int lpNumberOfBytesRead, // 读取多少字节 number of bytes read ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer ); [DllImport("coredll.dll")] private static extern bool WriteFile( int hFile, // 通信设备句柄 handle to file byte[] lpBuffer, // 数据缓冲区 data buffer int nNumberOfBytesToWrite, // 多少字节等待写入 number of bytes to write ref int lpNumberOfBytesWritten, // 已经写入多少字节 number of bytes written ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer ); [DllImport("coredll.dll")] private static extern bool CloseHandle( int hObject // handle to object ); [DllImport("coredll.dll")] private static extern uint GetLastError(); public void Open() { DCB dcbCommPort = new DCB(); COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS(); // 打开串口 OPEN THE COMM PORT. hComm = CreateFile(PortNum, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0); // 如果串口没有打开，就打开 IF THE PORT CANNOT BE OPENED, BAIL OUT. if (hComm == INVALID_HANDLE_VALUE) { throw (new ApplicationException("非法操作，不能打开串口！")); } // 设置通信超时时间 SET THE COMM TIMEOUTS. GetCommTimeouts(hComm, ref ctoCommPort); ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout; ctoCommPort.ReadTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutMultiplier = 0; ctoCommPort.WriteTotalTimeoutConstant = 0; SetCommTimeouts(hComm, ref ctoCommPort); // 设置串口 SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS. GetCommState(hComm, ref dcbCommPort); dcbCommPort.BaudRate = BaudRate; dcbCommPort.flags = 0; //dcb.fBinary=1; dcbCommPort.flags |= 1; if (Parity > 0) { //dcb.fParity=1 dcbCommPort.flags |= 2; } dcbCommPort.Parity = Parity; dcbCommPort.ByteSize = ByteSize; dcbCommPort.StopBits = StopBits; if (!SetCommState(hComm, ref dcbCommPort)) { //uint ErrorNum=GetLastError(); throw (new ApplicationException("非法操作，不能打开串口！")); } //unremark to see if setting took correctly //DCB dcbCommPort2 = new DCB(); //GetCommState(hComm, ref dcbCommPort2); Opened = true; } public void Close() { if (hComm != INVALID_HANDLE_VALUE) { CloseHandle(hComm); } } public byte[] Read(int NumBytes) { byte[] BufBytes; byte[] OutBytes; BufBytes = new byte[NumBytes]; if (hComm != INVALID_HANDLE_VALUE) { OVERLAPPED ovlCommPort = new OVERLAPPED(); int BytesRead = 0; ReadFile(hComm, BufBytes, NumBytes, ref BytesRead, ref ovlCommPort); try { OutBytes = new byte[BytesRead]; Array.Copy(BufBytes, 0, OutBytes, 0, BytesRead); } catch { return BufBytes; } } else { throw (new ApplicationException("串口未打开！")); } return OutBytes; // return BufBytes; } public void Write(byte[] WriteBytes) { if (hComm != INVALID_HANDLE_VALUE) { OVERLAPPED ovlCommPort = new OVERLAPPED(); int BytesWritten = 0; WriteFile(hComm, WriteBytes, WriteBytes.Length, ref BytesWritten, ref ovlCommPort); } else { throw (new ApplicationException("串口未打开！")); } } public string GetGPS(string strGPS, string strFind) { ///从GPS中读取的数据中,找出想要的数据 ///GPSstring原始字符串， ///strFind要查找的内容,X:经度，Y：纬度，T：时间，V：速度，是数字从1开始，即以“，”分隔的位置 ///返回查找到指定位置的字符串 string handerStr = "$GPRMC";//GPS串头 int findHander = strGPS.IndexOf(handerStr);//看是否含有GPS串头 if (findHander < 0) { return "-1"; } else { strGPS = strGPS.Substring(findHander, strGPS.Length - findHander); string[] ArryTmp = strGPS.Split(",".ToCharArray()); try { if (ArryTmp[2] == "V") { return "V";//没有信号 } else { switch (strFind) { case "X": return DM2DD(ArryTmp[5]); case "Y": return DM2DD(ArryTmp[3]); case "T": return T2Time(ArryTmp[9], ArryTmp[1]); case "V": return Convert.ToString(Convert.ToDouble(ArryTmp[7]) * 1.852); default: return "V"; } } } catch { return "V"; } } } public string T2Time(string strDate, string strTime) { string dT = "20" + strDate.Substring(4, 2) + "-" + strDate.Substring(2, 2) + "-" + strDate.Substring(0, 2); string TT = Convert.ToString(Convert.ToInt32(strTime.Substring(0, 2))) + ":" + strTime.Substring(2, 2) + ":" + strTime.Substring(4, 2); DateTime T = Convert.ToDateTime(dT + " " + TT); T = T.AddHours(8); return T.ToString(); } 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(); } #region 读取GPS private void opengps(string ComPoint) { ss_port.PortNum = ComPoint; ss_port.BaudRate = 4800; ss_port.ByteSize = 8; ss_port.Parity = 0; ss_port.StopBits = 1; ss_port.ReadTimeout = 1000; try { if (ss_port.Opened) { ss_port.Close(); ss_port.Open(); timer1.Enabled = true; } else { ss_port.Open();//打开串口 timer1.Enabled = true; } } catch { // MessageBox.Show("读取GPS错误!" ,"系统提示"); } } private void timer1_Tick(object sender, System.EventArgs e) { if (ss_port.Opened) gpsread(); else ss_port.Open();//打开串口 } private void gpsread() { byte[] aa = ss_port.Read(512); string gpsinfo = System.Text.Encoding.ASCII.GetString(aa, 0, aa.Length); GetParam.GpsLongitude = ss_port.GetGPS(gpsinfo, "X"); GetParam.GpsLatitude = ss_port.GetGPS(gpsinfo, "Y"); GetParam.GpsSpeed = ss_port.GetGPS(gpsinfo, "V"); GetParam.GpsTime = ss_port.GetGPS(gpsinfo, "T"); if (GetParam.GpsLongitude == "-1") GetParam.GpsState = "0"; if (GetParam.GpsLongitude == "V" && GetParam.GpsLatitude == "V") GetParam.GpsState = "0"; if (GetParam.GpsLongitude != "-1" && GetParam.GpsLongitude != "V") GetParam.GpsState = "1"; GetParam.GpsLongitude = (GetParam.GpsLongitude == "V") ? "0" : GetParam.GpsLongitude; GetParam.GpsLatitude = (GetParam.GpsLatitude == "V") ? "0" : GetParam.GpsLatitude; GetParam.GpsSpeed = (GetParam.GpsSpeed == "V") ? "0" : GetParam.GpsSpeed; GetParam.GpsTime = (GetParam.GpsTime == "V") ? "0" : GetParam.GpsTime; } private void GpsClose() { timer1.Enabled = false; if (ss_port.Opened) ss_port.Close(); } #endregion

转载的代码，未经本人测试，先贴出来存着。