C:/Documents and Settings/student/My Documents/robo_magellan/visual_studio_(system_controller)/system_controller/GPSModule/GpsStrategy.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using RS232Port;

namespace GpsModule {
        public class GpsStrategy : SerialStrategy {

                RmcStrategy _rmc;
                public RmcStrategy Rmc {
                        get { return _rmc; }
                }

                GgaStrategy _gga;
                public GgaStrategy Gga {
                        get { return _gga; }
                }

                GpsData _data;
                public GpsData Data {
                        get { return _data; }
                }

                public GpsStrategy(string portName) {
                        serialPortName = portName;
                        _data = new GpsData();
                        _rmc = new RmcStrategy();
                        _rmc.updateErrorEvent += updateError;
                        _gga = new GgaStrategy();
                        _gga.updateErrorEvent += updateError;
                        openSerialPortEvent += initializeGpsModulePort;
                        initializeGpsModulePort();
                }

                private void initializeGpsModulePort() {
                        _rs232 = new RS232MainForm();
                        _rs232.updateErrorEvent += updateError;
                        _rs232.Port.PortName = serialPortName;
                        _rs232.Show();
                        _rs232.Hide();
                        _rs232.Port.BaudRate = 38400;
                        _rs232.receiveDataEvent += receiveData;
                        _rs232.setSilentModeEvent += updateSilentMode;
                        _rs232.updatePortSettings();
                        _rs232.Text = "GPS Module Serial Port";
                        _rs232.DebugMode = RS232MainForm.debugTerminalMode.silent;
                        _rs232.Port.ReceivedBytesThreshold = 600;
                        _status = _rs232.initializeComPort();

                }

                private void receiveData() {
                        _data.setBuffer(_rs232.SerialData);
                        string s = _data.Buffer;
                        try {
                                while (s.Contains("$GP") && s.Contains("\r\n")
                                        && s.IndexOf("$GP") < s.LastIndexOf("\r\n")) {
                                        string sentence = s.Substring(s.IndexOf("$GP") + 3
                                                , s.IndexOf("\r\n", s.IndexOf("$GP")) - (s.IndexOf("$GP") + 3));
                                        s = s.Remove(0, s.IndexOf("\r\n") + 2);
                                        //computeChecksum(sentence);
                                        if (sentence.Contains("GGA"))
                                                _gga.parseSentance(sentence);
                                        else if (sentence.Contains("RMC") && _gga.Data.QualityIndicator > 0)
                                                _rmc.parseSentance(sentence);
                                }
                        } catch (Exception e) {
                                updateError(e);
                                _data.flushBuffer();
                        }
                        updateData();
                        updateUi();
                }

                private int computeChecksum(string data) {
                        //int checksum = 0;
                        byte testByte;
                        foreach (char c in data) {
                                testByte = (byte)c;
                        }
                        //checksum += ((int)(byte)c);

                        return 0;
                }
        }
}

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