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用C#读取GPS数据的基类

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-3));

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();

}

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