在PDA中获取GPS信息。-蒲公英云

http://www.cnblogs.com/anhlyiling/archive/2008/12/04/1347623.html

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

Code
1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4 using System.Runtime.InteropServices;
5
6 namespace AnhlYiling
7 {
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 handle
19 private int hComm = - 1 ;
20
21 public bool Opened = false ;
22
23 // win32 api constants
24 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 rate
35 // these are the c struct bit fields, bit twiddle flag to set
36 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OFF
49 　 RTS_CONTROL_ENABLE时, RTS置为ON
50 　　 RTS_CONTROL_HANDSHAKE时,
51 　　当接收缓冲区小于半满时RTS为ON
52 　　当接收缓冲区超过四分之三满时RTS为OFF
53 　　 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0
99 int lpSecurityAttributes, // 设置串口的安全属性，WIN9X下不支持，应设为NULL
100 int dwCreationDisposition, // 对于串口通信，创建方式只能为OPEN_EXISTING
101 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NULL
103 );
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DCB
108 );
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 device
122 ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values
123 );
124 [DllImport( “ coredll.dll “ )]
125 private static extern bool SetCommTimeouts(
126 int hFile, // 通信设备句柄 handle to comm device
127 ref COMMTIMEOUTS lpCommTimeouts // 超时时间 time-out values
128 );
129 [DllImport( “ coredll.dll “ )]
130 private static extern bool ReadFile(
131 int hFile, // 通信设备句柄 handle to file
132 byte [] lpBuffer, // 数据缓冲区 data buffer
133 int nNumberOfBytesToRead, // 多少字节等待读取 number of bytes to read
134 ref int lpNumberOfBytesRead, // 读取多少字节 number of bytes read
135 ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer
136 );
137 [DllImport( “ coredll.dll “ )]
138 private static extern bool WriteFile(
139 int hFile, // 通信设备句柄 handle to file
140 byte [] lpBuffer, // 数据缓冲区 data buffer
141 int nNumberOfBytesToWrite, // 多少字节等待写入 number of bytes to write
142 ref int lpNumberOfBytesWritten, // 已经写入多少字节 number of bytes written
143 ref OVERLAPPED lpOverlapped // 溢出缓冲区 overlapped buffer
144 );
145 [DllImport( “ coredll.dll “ )]
146 private static extern bool CloseHandle(
147 int hObject // handle to object
148 );
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=1
183 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 correctly
194 // 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 try
218 {
219 OutBytes = new byte [BytesRead];
220 Array.Copy(BufBytes, 0 ,OutBytes, 0 ,BytesRead);
221 }
222 catch
223 {
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 else
265 {
266 strGPS = strGPS.Substring(findHander, strGPS.Length - findHander);
267 string [] ArryTmp = strGPS.Split( “ , “ .ToCharArray());
268 try
269 {
270 if (ArryTmp[ 2 ] == “ V “ )
271 {
272 return “ GPS没有信号 “ ; // 没有信号
273 }
274 else
275 {
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 catch
299 {
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 else
313 {
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)) / 10000
351 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)) / 10000
366 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 try
384 {
385 if (Opened)
386 {
387 Close();
388 Open();
389 }
390 else
391 {
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 else
400 return false ;
401 }
402 catch
403 {
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 string
413 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 }