在PDA中获取GPS信息。
近日一个项目需要用在PDA上读取GPS卫星信号,在网上搜了一圈,整理出一个GPS的类,大家可以直接加入项目
使用。可以获得当前的经纬度、海拔、速度、连接卫星数等信息
1
using System;2
using System.Collections.Generic;3
using System.Text;4
using System.Runtime.InteropServices;5

6
namespace AnhlYiling7


{8
public class GPS 9

{10

11
public string PortNum; 12
public int BaudRate;13
public byte ByteSize;14
public byte Parity; // 0-4=no,odd,even,mark,space 15
public byte StopBits; // 0,1,2 = 1, 1.5, 2 16
public int ReadTimeout;17
18
//comm port win32 file handle19
private int hComm = -1;20
21
public bool Opened = false;22
23
//win32 api constants24
private const uint GENERIC_READ = 0x80000000;25
private const uint GENERIC_WRITE = 0x40000000;26
private const int OPEN_EXISTING = 3; 27
private const int INVALID_HANDLE_VALUE = -1;28
29
[StructLayout(LayoutKind.Sequential)]30
public struct DCB 31

{32
//taken from c struct in platform sdk 33
public int DCBlength; // sizeof(DCB) 34
public int BaudRate; // 指定当前波特率 current baud rate35
// these are the c struct bit fields, bit twiddle flag to set36
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 37
public int fParity; // 指定是否允许奇偶校验 enable parity checking 38
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 39
public int fOutxDsrFlow; // 指定CTS是否用于检测发送控制 DSR output flow control 40
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 41
public int fDsrSensitivity; // 当该值为TRUE时DSR为OFF时接收的字节被忽略 DSR sensitivity 42
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 43
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 44
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 45
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 46
public int fNull; // eTRUE时,接收时去掉空(0值)字节 enable null stripping 47
public int fRtsControl; // RTS flow control 48

/**//*RTS_CONTROL_DISABLE时,RTS置为OFF49
RTS_CONTROL_ENABLE时, RTS置为ON50
RTS_CONTROL_HANDSHAKE时,51
当接收缓冲区小于半满时RTS为ON52
当接收缓冲区超过四分之三满时RTS为OFF53
RTS_CONTROL_TOGGLE时,54
当接收缓冲区仍有剩余字节时RTS为ON ,否则缺省为OFF*/55

56
public int fAbortOnError; // TRUE时,有错误发生时中止读和写操作 abort on error 57
public int fDummy2; // 未使用 reserved 58
59
public uint flags;60
public ushort wReserved; // 未使用,必须为0 not currently used 61
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 62
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 63
public byte ByteSize; // 指定端口当前使用的数据位 number of bits/byte, 4-8 64
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 65
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 66
public char XonChar; // 指定用于发送和接收字符XON的值 Tx and Rx XON character 67
public char XoffChar; // 指定用于发送和接收字符XOFF值 Tx and Rx XOFF character 68
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 69
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 70
public char EvtChar; // 当接收到此字符时,会产生一个事件 received event character 71
public ushort wReserved1; // 未使用 reserved; do not use 72
}73

74
[StructLayout(LayoutKind.Sequential)]75
private struct COMMTIMEOUTS 76

{ 77
public int ReadIntervalTimeout; 78
public int ReadTotalTimeoutMultiplier; 79
public int ReadTotalTimeoutConstant; 80
public int WriteTotalTimeoutMultiplier; 81
public int WriteTotalTimeoutConstant; 82
} 83

84
[StructLayout(LayoutKind.Sequential)] 85
private struct OVERLAPPED 86

{ 87
public int Internal; 88
public int InternalHigh; 89
public int Offset; 90
public int OffsetHigh; 91
public int hEvent; 92
} 93
94
[DllImport("coredll.dll")]95
private static extern int CreateFile(96
string lpFileName, // 要打开的串口名称97
uint dwDesiredAccess, // 指定串口的访问方式,一般设置为可读可写方式98
int dwShareMode, // 指定串口的共享模式,串口不能共享,所以设置为099
int lpSecurityAttributes, // 设置串口的安全属性,WIN9X下不支持,应设为NULL100
int dwCreationDisposition, // 对于串口通信,创建方式只能为OPEN_EXISTING101
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102
int hTemplateFile // 对于串口通信必须设置为NULL103
);104
[DllImport("coredll.dll")]105
private static extern bool GetCommState(106
int hFile, //通信设备句柄107
ref DCB lpDCB // 设备控制块DCB108
); 109
[DllImport("coredll.dll")]110
private static extern bool BuildCommDCB(111
string lpDef, // 设备控制字符串112
ref DCB lpDCB // 设备控制块113
);114
[DllImport("coredll.dll")]115
private static extern bool SetCommState(116
int hFile, // 通信设备句柄117
ref DCB lpDCB // 设备控制块118
);119
[DllImport("coredll.dll")]120
private static extern bool GetCommTimeouts(121
int hFile, // 通信设备句柄 handle to comm device122
ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values123
); 124
[DllImport("coredll.dll")] 125
private static extern bool SetCommTimeouts(126
int hFile, // 通信设备句柄 handle to comm device127
ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values128
);129
[DllImport("coredll.dll")]130
private static extern bool ReadFile(131
int hFile, // 通信设备句柄 handle to file132
byte[] lpBuffer, // 数据缓冲区 data buffer133
int nNumberOfBytesToRead, // 多少字节等待读取 number of bytes to read134
ref int lpNumberOfBytesRead, // 读取多少字节 number of bytes read135
ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer136
);137
[DllImport("coredll.dll")] 138
private static extern bool WriteFile(139
int hFile, // 通信设备句柄 handle to file140
byte[] lpBuffer, // 数据缓冲区 data buffer141
int nNumberOfBytesToWrite, // 多少字节等待写入 number of bytes to write142
ref int lpNumberOfBytesWritten, // 已经写入多少字节 number of bytes written143
ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer144
);145
[DllImport("coredll.dll")]146
private static extern bool CloseHandle(147
int hObject // handle to object148
);149
[DllImport("coredll.dll")]150
private static extern uint GetLastError();151
152
public void Open()153

{154
155
DCB dcbCommPort = new DCB();156
COMMTIMEOUTS ctoCommPort = new COMMTIMEOUTS(); 157
158
// 打开串口 OPEN THE COMM PORT.159
hComm = CreateFile(PortNum ,GENERIC_READ | GENERIC_WRITE,0, 0,OPEN_EXISTING,0,0);160
// 如果串口没有打开,就打开 IF THE PORT CANNOT BE OPENED, BAIL OUT.161
if(hComm == INVALID_HANDLE_VALUE) 162

{163
throw(new ApplicationException("非法操作,不能打开串口!"));164
}165
166
// 设置通信超时时间 SET THE COMM TIMEOUTS.167
GetCommTimeouts(hComm,ref ctoCommPort);168
ctoCommPort.ReadTotalTimeoutConstant = ReadTimeout;169
ctoCommPort.ReadTotalTimeoutMultiplier = 0;170
ctoCommPort.WriteTotalTimeoutMultiplier = 0;171
ctoCommPort.WriteTotalTimeoutConstant = 0; 172
SetCommTimeouts(hComm,ref ctoCommPort);173
174
// 设置串口 SET BAUD RATE, PARITY, WORD SIZE, AND STOP BITS.175
GetCommState(hComm, ref dcbCommPort);176
dcbCommPort.BaudRate=BaudRate;177
dcbCommPort.flags=0;178
//dcb.fBinary=1;179
dcbCommPort.flags|=1;180
if (Parity>0)181

{182
//dcb.fParity=1183
dcbCommPort.flags|=2;184
}185
dcbCommPort.Parity=Parity;186
dcbCommPort.ByteSize=ByteSize;187
dcbCommPort.StopBits=StopBits;188
if (!SetCommState(hComm, ref dcbCommPort))189

{190
//uint ErrorNum=GetLastError();191
throw(new ApplicationException("非法操作,不能打开串口!"));192
}193
//unremark to see if setting took correctly194
//DCB dcbCommPort2 = new DCB();195
//GetCommState(hComm, ref dcbCommPort2);196
Opened = true;197
}198
199
public void Close() 200

{201
if (hComm!=INVALID_HANDLE_VALUE) 202

{203
CloseHandle(hComm);204
}205
}206
207
public byte[] Read(int NumBytes) 208

{209
byte[] BufBytes;210
byte[] OutBytes;211
BufBytes = new byte[NumBytes];212
if (hComm!=INVALID_HANDLE_VALUE) 213

{214
OVERLAPPED ovlCommPort = new OVERLAPPED();215
int BytesRead=0;216
ReadFile(hComm,BufBytes,NumBytes,ref BytesRead,ref ovlCommPort);217
try218

{219
OutBytes = new byte[BytesRead];220
Array.Copy(BufBytes,0,OutBytes,0,BytesRead);221
}222
catch223

{224
return BufBytes;225
}226
227
} 228
else 229

{230
throw(new ApplicationException("串口未打开!"));231
}232
return OutBytes;233
// return BufBytes;234
}235
236
public void Write(byte[] WriteBytes) 237

{238
if (hComm!=INVALID_HANDLE_VALUE) 239

{240
OVERLAPPED ovlCommPort = new OVERLAPPED();241
int BytesWritten = 0;242
WriteFile(hComm,WriteBytes,WriteBytes.Length,ref BytesWritten,ref ovlCommPort);243
}244
else 245

{246
throw(new ApplicationException("串口未打开!"));247
} 248
}249

250
public string GetGPS(string hander,string strGPS,string strFind)251

{252

/**////从GPS中读取的数据中,找出想要的数据253
///GPSstring原始字符串,254
///strFind要查找的内容,X:经度,Y:纬度,T:时间,V:速度,N 当前可用卫星数量,H 当前海拔255
///返回查找到指定位置的字符串256
if (hander.Equals("$GPRMC"))257

{258
string handerStr = hander;//GPS串头259
int findHander = strGPS.IndexOf(handerStr);//看是否含有GPS串头260
if (findHander < 0)261

{262
return "-1";263
}264
else265

{266
strGPS = strGPS.Substring(findHander, strGPS.Length - findHander);267
string[] ArryTmp = strGPS.Split(",".ToCharArray());268
try269

{270
if (ArryTmp[2] == "V")271

{272
return "GPS没有信号";//没有信号273
}274
else275

{276
switch (strFind)277

{278
case "X":279
return DM2DD(ArryTmp[5]);280

281
case "Y":282
return DM2DD(ArryTmp[3]);283

284
case "T":285
return T2Time(ArryTmp[9], ArryTmp[1]);286

287
case "V":288
return Convert.ToString(Convert.ToDouble(ArryTmp[7]) * 1.852);289

290
case "K":291
return ArryTmp[7];292
default:293
return "V";294

295
}296
}297
}298
catch299

{300
return "V";301
}302
}303
}304
else if (hander.Equals("$GPGGA"))305

{306
string handerStr = hander;//GPS串头307
int findHander = strGPS.IndexOf(handerStr);//看是否含有GPS串头308
if (findHander < 0)309

{310
return "-1";311
}312
else313

{314
strGPS = strGPS.Substring(findHander, strGPS.Length - findHander);315
string[] ArryTmp = strGPS.Split(",".ToCharArray());316
switch (strFind)317

{318
case "N":319
return ArryTmp[7];320
case "H":321
return ArryTmp[9];322
default:323
return "无法解析的命令.";324
}325
}326
}327

328
return null;329

330
}331

332
public string T2Time(string strDate,string strTime)333

{334
string dT="20"+strDate.Substring(4,2)+"-"+strDate.Substring(2,2)+"-"+strDate.Substring(0,2);335
string TT=Convert.ToString(Convert.ToInt32(strTime.Substring(0,2)))+":"+strTime.Substring(2,2)+":"+strTime.Substring(4,2);336
DateTime T=Convert.ToDateTime(dT+" "+TT);337
T=T.AddHours(8);338
return T.ToString();339
}340

341
public string DM2DD(string DegreeMinutes)342

{343
//转换NMEA协议的“度分”格式为十进制“度度”格式344
string sDegree;345
string sMinute;346
string sReturn="";347
if(DegreeMinutes.IndexOf(".")==4)348

{349
//DegreeMinutes = Replace(DegreeMinutes, ".", "")350
//DM2DD = CDbl(Left(DegreeMinutes, 2)) + CDbl(Left(CStr(CDbl(Right(DegreeMinutes, Len(DegreeMinutes) - 2)) / 60), 8)) / 10000351
DegreeMinutes=DegreeMinutes.Replace(".","");352
double sDegree1=Convert.ToDouble(DegreeMinutes.Substring(0,2));353
double sDegree2=Convert.ToDouble(DegreeMinutes.Substring(2,DegreeMinutes.Length-2));354
string sTmp=Convert.ToString(sDegree2/60);355
sDegree2=Convert.ToDouble(sTmp.Substring(0,sTmp.Length));356
sDegree2=sDegree2/10000;357
sDegree=Convert.ToString(sDegree1+sDegree2);358
if(sDegree.Length>11)359
sDegree=sDegree.Substring(0,11);360
sReturn=sDegree;361
}362
else if(DegreeMinutes.IndexOf(".")==5)363

{364
//DegreeMinutes = Replace(DegreeMinutes, ".", "")365
//DM2DD = CDbl(Left(DegreeMinutes, 2)) + CDbl(Left(CStr(CDbl(Right(DegreeMinutes, Len(DegreeMinutes) - 2)) / 60), 8)) / 10000366
DegreeMinutes=DegreeMinutes.Replace(".","");367
double sMinute1=Convert.ToDouble(DegreeMinutes.Substring(0,3));368
double sMinute2=Convert.ToDouble(DegreeMinutes.Substring(3,DegreeMinutes.Length-3));369
string sTmp=Convert.ToString(sMinute2/60);370
sMinute2=Convert.ToDouble(sTmp.Substring(0,sTmp.Length));371
sMinute2=sMinute2/10000;372
sMinute=Convert.ToString(sMinute1+sMinute2);373
if(sMinute.Length>10)374
sMinute=sMinute.Substring(0,10);375
sReturn=sMinute;376
}377
return sReturn;378
}379

380
public bool ScanPort()381

{382
383
try384

{385
if (Opened)386

{387
Close();388
Open();389
}390
else391

{392
Open();//打开串口393
394
}395
byte[] bytRead=Read(512);396
Close();397
if(Encoding.ASCII.GetString(bytRead,0,bytRead.Length).IndexOf("$GP")>=0)398
return true;399
else400
return false;401
}402
catch403

{404
return false;405
}406

407
}408
}409

410
class HexCon 411

{412
// 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 string413
public static string ByteToString(byte[] InBytes) 414

{415
string StringOut="";416
foreach (byte InByte in InBytes) 417

{418
StringOut=StringOut + String.Format("{0:X2} ",InByte);419
}420
return StringOut; 421
}422
public static byte[] StringToByte(string InString) 423

{424
string[] ByteStrings;425
ByteStrings = InString.Split(" ".ToCharArray());426
byte[] ByteOut;427
ByteOut = new byte[ByteStrings.Length-1];428
for (int i = 0;i==ByteStrings.Length-1;i++) 429

{430
ByteOut[i] = Convert.ToByte(("0x" + ByteStrings[i]));431
} 432
return ByteOut;433
}434

435
}436
}437

调用很简单:
1 GPS ss_port = new GPS();
2 ss_port.PortNum = "COM4:"; //串口号.后面一定要有':'
3 ss_port.BaudRate = 4800;
4 ss_port.ByteSize = 8;
5 ss_port.Parity = 0;
6 ss_port.StopBits = 1;
7 ss_port.ReadTimeout = 1000;
8
9 try
10 {
11 if (ss_port.Opened)
12 {
13 ss_port.Close();
14 ss_port.Open();
15 timer1.Enabled = true;
16 }
17 else
18 {
19 ss_port.Open();//打开串口
20 label1.Text = "已打开";
21 timer1.Enabled = true;
22 }
23
24 }
25 catch (Exception e1)
26 {
27 label1.Text = e1.Message;
28
29 }
2 ss_port.PortNum = "COM4:"; //串口号.后面一定要有':'
3 ss_port.BaudRate = 4800;
4 ss_port.ByteSize = 8;
5 ss_port.Parity = 0;
6 ss_port.StopBits = 1;
7 ss_port.ReadTimeout = 1000;
8
9 try
10 {
11 if (ss_port.Opened)
12 {
13 ss_port.Close();
14 ss_port.Open();
15 timer1.Enabled = true;
16 }
17 else
18 {
19 ss_port.Open();//打开串口
20 label1.Text = "已打开";
21 timer1.Enabled = true;
22 }
23
24 }
25 catch (Exception e1)
26 {
27 label1.Text = e1.Message;
28
29 }
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