用C＃讀取GPS數據的基類
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; // 指定當前波特率 current baud rate
// these are the c struct bit fields, bit twiddle flag to set
public int fBinary; // 指定是否允許二進制模式,在windows95中必須主TRUE binary mode, no EOF check
public int fParity; // 指定是否允許奇偶校驗 enable parity checking
public int fOutxCtsFlow; // 指定CTS是否用於檢測發送控制，當爲TRUE是CTS爲OFF，發送將被掛起。 CTS output flow control
public int fOutxDsrFlow; // 指定CTS是否用於檢測發送控制 DSR output flow control
public int fDtrControl; // DTR_CONTROL_DISABLE值將DTR置爲OFF, DTR_CONTROL_ENABLE值將DTR置爲ON, DTR_CONTROL_HANDSHAKE允許DTR"握手" DTR flow control type
public int fDsrSensitivity; // 當該值爲TRUE時DSR爲OFF時接收的字節被忽略 DSR sensitivity
public int fTXContinueOnXoff; // 指定當接收緩衝區已滿,並且驅動程序已經發送出XoffChar字符時發送是否停止。TRUE時，在接收緩衝區接收到緩衝區已滿的字節XoffLim且驅動程序已經發送出XoffChar字符中止接收字節之後，發送繼續進行。 FALSE時，在接收緩衝區接收到代表緩衝區已空的字節XonChar且驅動程序已經發送出恢復發送的XonChar之後，發送繼續進行。XOFF continues Tx
public int fOutX; // TRUE時，接收到XoffChar之後便停止發送接收到XonChar之後將重新開始 XON/XOFF out flow control
public int fInX; // TRUE時，接收緩衝區接收到代表緩衝區滿的XoffLim之後，XoffChar發送出去接收緩衝區接收到代表緩衝區空的XonLim之後，XonChar發送出去 XON/XOFF in flow control
public int fErrorChar; // 該值爲TRUE且fParity爲TRUE時，用ErrorChar 成員指定的字符代替奇偶校驗錯誤的接收字符 enable error replacement
public int fNull; // eTRUE時，接收時去掉空(0值)字節 enable null stripping
public int fRtsControl; // RTS flow control
/*RTS_CONTROL_DISABLE時,RTS置爲OFF
RTS_CONTROL_ENABLE時, RTS置爲ON
RTS_CONTROL_HANDSHAKE時,
當接收緩衝區小於半滿時RTS爲ON
當接收緩衝區超過四分之三滿時RTS爲OFF
RTS_CONTROL_TOGGLE時,
當接收緩衝區仍有剩餘字節時RTS爲ON ,否則缺省爲OFF*/
public int fAbortOnError; // TRUE時,有錯誤發生時中止讀和寫操作 abort on error
public int fDummy2; // 未使用 reserved
public uint flags;
public ushort wReserved; // 未使用,必須爲0 not currently used
public ushort XonLim; // 指定在XON字符發送這前接收緩衝區中可允許的最小字節數 transmit XON threshold
public ushort XoffLim; // 指定在XOFF字符發送這前接收緩衝區中可允許的最小字節數 transmit XOFF threshold
public byte ByteSize; // 指定端口當前使用的數據位 number of bits/byte, 4-8
public byte Parity; // 指定端口當前使用的奇偶校驗方法,可能爲:EVENPARITY,MARKPARITY,NOPARITY,ODDPARITY 0-4=no,odd,even,mark,space
public byte StopBits; // 指定端口當前使用的停止位數,可能爲:ONESTOPBIT,ONE5STOPBITS,TWOSTOPBITS 0,1,2 = 1, 1.5, 2
public char XonChar; // 指定用於發送和接收字符XON的值 Tx and Rx XON character
public char XoffChar; // 指定用於發送和接收字符XOFF值 Tx and Rx XOFF character
public char ErrorChar; // 本字符用來代替接收到的奇偶校驗發生錯誤時的值 error replacement character
public char EofChar; // 當沒有使用二進制模式時,本字符可用來指示數據的結束 end of input character
public char EvtChar; // 當接收到此字符時,會產生一個事件 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, // 要打開的串口名稱
uint dwDesiredAccess, // 指定串口的訪問方式，一般設置爲可讀可寫方式
int dwShareMode, // 指定串口的共享模式，串口不能共享，所以設置爲0
int lpSecurityAttributes, // 設置串口的安全屬性，WIN9X下不支持，應設爲NULL
int dwCreationDisposition, // 對於串口通信，創建方式只能爲OPEN_EXISTING
int dwFlagsAndAttributes, // 指定串口屬性與標誌，設置爲FILE_FLAG_OVERLAPPED(重疊I/O操作)，指定串口以異步方式通信
int hTemplateFile // 對於串口通信必須設置爲NULL
);
[DllImport("coredll.dll")]
private static extern bool GetCommState(
int hFile, //通信設備句柄
ref DCB lpDCB // 設備控制塊DCB
);
[DllImport("coredll.dll")]
private static extern bool BuildCommDCB(
string lpDef, // 設備控制字符串
ref DCB lpDCB // 設備控制塊
);
[DllImport("coredll.dll")]
private static extern bool SetCommState(
int hFile, // 通信設備句柄
ref DCB lpDCB // 設備控制塊
);
[DllImport("coredll.dll")]
private static extern bool GetCommTimeouts(
int hFile, // 通信設備句柄 handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // 超時時間 time-out values
);
[DllImport("coredll.dll")]
private static extern bool SetCommTimeouts(
int hFile, // 通信設備句柄 handle to comm device
ref COMMTIMEOUTS lpCommTimeouts // 超時時間 time-out values
);
[DllImport("coredll.dll")]
private static extern bool ReadFile(
int hFile, // 通信設備句柄 handle to file
byte[] lpBuffer, // 數據緩衝區 data buffer
int nNumberOfBytesToRead, // 多少字節等待讀取 number of bytes to read
ref int lpNumberOfBytesRead, // 讀取多少字節 number of bytes read
ref OVERLAPPED lpOverlapped // 溢出緩衝區 overlapped buffer
);
[DllImport("coredll.dll")]
private static extern bool WriteFile(
int hFile, // 通信設備句柄 handle to file
byte[] lpBuffer, // 數據緩衝區 data buffer
int nNumberOfBytesToWrite, // 多少字節等待寫入 number of bytes to write
ref int lpNumberOfBytesWritten, // 已經寫入多少字節 number of bytes written
ref OVERLAPPED lpOverlapped // 溢出緩衝區 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();
// 打開串口 OPEN THE COMM PORT.
hComm = CreateFile(PortNum ,GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0);
// 如果串口沒有打開，就打開 IF THE PORT CANNOT BE OPENED, BAIL OUT.
if(hComm == INVALID_HANDLE_VALUE)
{
throw(new ApplicationException("非法操作，不能打開串口!"));
}
// 設置通信超時時間 SET THE COMM TIMEOUTS.
GetCommTimeouts(hComm,ref ctoCommPort);
ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout;
ctoCommPort.ReadTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutMultiplier = 0;
ctoCommPort.WriteTotalTimeoutConstant = 0;
SetCommTimeouts(hComm,ref ctoCommPort);
// 設置串口 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，不能打開串口!"));
}
//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("串口未打開!"));
}
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("串口未打開!"));
}
}
public string GetGPS(string strGPS,string strFind)
{
///從GPS中讀取的數據中,找出想要的數據
///GPSstring原始字符串，
///strFind要查找的內容,X:經度，Y：緯度，T：時間，V：速度，是數字從1開始，即以“，”分隔的位置
///返回查找到指定位置的字符串
string handerStr="$GPRMC"; //GPS串頭
int findHander=strGPS.IndexOf(handerStr); //看是否含有GPS串頭
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"; //沒有信號
}
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)
{
//轉換NMEA協議的“度分”格式爲十進制“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(); //打開串口
}
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
{
// 把十六進制字符串轉換成字節型和把字節型轉換成十六進制字符串 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;
}
}
}
在別的class中調用時如Frmlogoin(是通過一個時間控件來循環的)
public class Frmlogin : System.Windows.Forms.Form
{
private GPS ss_port=new GPS();
}
#region 讀取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(); //打開串口
timer1.Enabled=true;
}
}
catch
{
// MessageBox.Show("讀取GPS錯誤!" ,"系統提示");
}
}
private void timer1_Tick(object sender, System.EventArgs e)
{
if (ss_port.Opened)
gpsread();
else
ss_port.Open(); //打開串口
}
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();
}