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
1using System;
2using System.Collections.Generic;
3using System.Text;
4using System.Runtime.InteropServices;
5
6namespace 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
1using System;
2using System.Collections.Generic;
3using System.Text;
4using System.Runtime.InteropServices;
5
6namespace 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 }
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 }