【IT168技术文档】
1using System; 2using System.IO.Ports; 3using System.Collections; 4using System.Collections.Generic; 5using System.Windows.Forms; 6using System.Runtime.InteropServices; 7 8namespace Lordeo.AssetMan.PPC.App 9{ 10 public class GpsMonitor 11 { 12 private SerialPort m_serialPort; 13 14 private System.Windows.Forms.Timer m_timer; 15 private const int defaultTimerInterval = 800; //越快越容易出错 16 //读取到事件 17 public event EventHandler OnDataRecieved; 18 //临时存储读取的信息 19 private string m_dataReaded = string.Empty; 20 21 /**//// <summary> 22 /// 构造 23 /// </summary> 24 public GpsMonitor() 25 { 26 //timer 27 m_timer = new System.Windows.Forms.Timer(); 28 m_timer.Interval = defaultTimerInterval; 29 m_timer.Tick += new EventHandler(Timer_Tick); 30 31 //设置端口的默认值 32 m_serialPort = new SerialPort(); 33 m_serialPort.ReadBufferSize = 2048; 34 m_serialPort.BaudRate = 4800; //P800默认的速率，过高的速率容易产生误码 35 m_serialPort.DataBits = 8; 36 m_serialPort.Parity = Parity.None; 37 m_serialPort.StopBits = StopBits.One; 38 m_serialPort.ReadTimeout = 2000;//超时 39 m_serialPort.PortName = "COM4"; //多数GPS都用COM4 40 41 m_serialPort.ErrorReceived += new SerialErrorReceivedEventHandler(SerialPort_ErrorReceived); 42 } 43 44 private void SerialPort_ErrorReceived(object sender, SerialErrorReceivedEventArgs e) 45 { 46 this.Message = e.ToString(); 47 } 48 49 timer#region timer 50 /**//// <summary> 51 /// 计时器工作 52 /// </summary> 53 /// <param name="sender"></param> 54 /// <param name="e"></param> 55 private void Timer_Tick(object sender, EventArgs e) 56 { 57 try 58 { 59 if (!string.IsNullOrEmpty(m_serialPort.ReadLine())) 60 { 61 this.Message = m_serialPort.ReadLine(); 62 63 64 } 65 } 66 catch (Exception ex) 67 { 68 if (ex.GetType() == typeof(System.TimeoutException)) 69 { 70 //this.StopWatch(); 71 this.Message = "操作超时，请确认设备是否已经打开或尝试其他端口。"; 72 } 73 } 74 } 75 #endregion 76 77 OpenSerialPort#region OpenSerialPort 78 /**//// <summary> 79 /// 打开端口 80 /// </summary> 81 private void OpenSerialPort() 82 { 83 if (!m_serialPort.IsOpen) 84 { 85 try 86 { 87 m_serialPort.Open(); 88 } 89 catch (Exception x) 90 { 91 this.Message = x.Message; 92 this.StopWatch(); 93 } 94 } 95 } 96 #endregion 97 98 CloseSerialPort#region CloseSerialPort 99 /**//// <summary> 100 /// 关闭端口 101 /// </summary> 102 private void CloseSerialPort() 103 { 104 m_serialPort.Close(); 105 } 106 #endregion 107 108 properties#region properties 109 /**//// <summary> 110 ///设置读取的时间间隔，单位毫秒 111 /// </summary> 112 public int Interval 113 { 114 set 115 { 116 this.m_timer.Interval = value; 117 } 118 } 119 120 121 /**//// <summary> 122 /// 执行读取 123 /// </summary> 124 public void BeginWatch() 125 { 126 OpenSerialPort(); 127 m_timer.Enabled = true; 128 } 129 /**//// <summary> 130 /// 停止读取 131 /// </summary> 132 public void StopWatch() 133 { 134 m_timer.Enabled = false; 135 CloseSerialPort(); 136 } 137 138 /**//// <summary> 139 /// 读取到的信息 140 /// </summary> 141 public string Message 142 { 143 set 144 { 145 m_dataReaded = value; 146 OnDataRecieved(this, null); 147 } 148 get 149 { 150 return m_dataReaded; 151 } 152 } 153 154 /**//// <summary> 155 /// 设置波特率 156 /// </summary> 157 public int BaudRate 158 { 159 get { return m_serialPort.BaudRate; } 160 set { m_serialPort.BaudRate = value; } 161 } 162 163 /**//// <summary> 164 /// 数据位 165 /// </summary> 166 public int DataBits 167 { 168 get { return m_serialPort.DataBits; } 169 set { m_serialPort.DataBits = value; } 170 } 171 /**//// <summary> 172 /// 校验协议 173 /// </summary> 174 public Parity ParityType 175 { 176 get { return m_serialPort.Parity; } 177 set { m_serialPort.Parity = value; } 178 } 179 /**//// <summary> 180 /// 停止位 181 /// </summary> 182 public StopBits StopBitsType 183 { 184 get { return m_serialPort.StopBits; } 185 set { m_serialPort.StopBits = value; } 186 } 187 /**//// <summary> 188 /// 端口号 189 /// </summary> 190 public string PortName 191 { 192 get { return m_serialPort.PortName; } 193 set { m_serialPort.PortName = value; } 194 } 195 #endregion 196 197 获取可用端口#region 获取可用端口 198 /**//// <summary> 199 /// 获取本机可用端口名称 200 /// </summary> 201 /// <returns></returns> 202 public string[] GetPortNames() 203 { 204 ArrayList ports = new ArrayList(); 205 206 uint hPort = INVALID_FILE_HANDLE; 207 208 string port = string.Empty; 209 210 for (int i = 0; i < 10; i++) 211 { 212 port = "COM" + i.ToString() + ":"; 213 214 hPort = CreateFile(port, GENERIC_READ, 0, 0, OPEN_EXISTING, 0, IntPtr.Zero); 215 if (hPort != INVALID_FILE_HANDLE) 216 { 217 ports.Add(port); 218 Console.WriteLine(port); 219 CloseHandle(hPort); 220 } 221 } 222 223 return (string[])ports.ToArray(typeof(string)); 224 } 225 226 wince defination#region wince defination 227 private const uint GENERIC_READ = 0x80000000; 228 private const uint OPEN_EXISTING = 3; 229 private const uint INVALID_FILE_HANDLE = 0xFFFFFFFF; 230 231 [DllImport("coredll.dll")] 232 static extern uint CreateFile(string lpFileName, uint dwDesiredAccess, uint dwShareMode, uint lpSecurityAttributes, uint dwCreationDisposition, uint dwFlagsAndAttributes, IntPtr notUsedPassZero); 233 234 [DllImport("coredll.dll")] 235 static extern int CloseHandle(uint hObject); 236 #endregion 237 238 #endregion 239 } 240} 241
