我最近正在为我爸爸公司制作GPS软件。每个卡车司机都在他们的计算机上有一台笔记本电脑，我正在尝试制作一个软件来找到他们去的地方。从我在这里看到的上一篇文章中，有一个人建议GPS SYSTEM LINK(codePlex)
System.dll
中出现“System.IO.IOException”类型的未处理异常附加信息：端口'COM1'不存在。“
这是按钮代码 。 `
private void connectButton_Click (object sender, EventArgs e)
{
_port.Open();
_timer.Start();
connectButton.Enabled = false;
disconnectButton.Enabled = true;
portList.Enabled = false;
}
`
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.IO.Ports;
using System.Text;
using System.Windows.Forms;
namespace GPS
{
public partial class MainForm : Form
{
private GgaCommand _lastGga;
private GsaCommand _lastGsa;
private GsvCommand _lastGsv;
private RmcCommand _lastRmc;
private GllCommand _lastGll;
public MainForm ()
{
Control.CheckForIllegalCrossThreadCalls = false;
InitializeComponent();
_port.NewLine = "\r\n";
}
protected override void OnLoad (EventArgs e)
{
portList.Items.AddRange(System.IO.Ports.SerialPort.GetPortNames());
portList.SelectedIndex = portList.Items.Count - 1;
base.OnLoad(e);
}
public Satellite[] Satellites
{
get
{
if (_lastGsv == null)
return new Satellite[0];
List<Satellite> sats = new List<Satellite>(_lastGsv.Satellites);
for (int i = 0; i < sats.Count; i++)
sats[i] = sats[i] + _lastGsa;
return sats.ToArray();
}
}
private void portList_SelectedIndexChanged (object sender, EventArgs e)
{
_port.PortName = portList.SelectedItem as string;
}
private void connectButton_Click (object sender, EventArgs e)
{
_port.Open();
_timer.Start();
connectButton.Enabled = false;
disconnectButton.Enabled = true;
portList.Enabled = false;
}
private void disconnectButton_Click (object sender, EventArgs e)
{
_timer.Stop();
_port.Close();
connectButton.Enabled = true;
disconnectButton.Enabled = false;
portList.Enabled = true;
}
private void timer_Tick (object sender, EventArgs e)
{
try {
string data = _port.ReadLine();
if (String.IsNullOrEmpty(data) == false) {
ProcessCommand(data);
}
} catch (Exception exc) {
System.Diagnostics.Debug.WriteLine(exc);
}
}
private void altitude_CheckedChanged (object sender, EventArgs e)
{
RefreshAltitude();
}
private void distance_CheckedChanged (object sender, EventArgs e)
{
RefreshDistance();
}
private void ProcessCommand (string data)
{
// all commands start with dollar signs
if (data[0] != '$')
return;
//System.Diagnostics.Debug.WriteLine(data, "Command");
if (data.IndexOf('*') != -1)
data = data.Substring(0, data.IndexOf('*'));
switch (data.Substring(3, 3)) {
case "GGA":
_lastGga = new GgaCommand(data);
latitudeValueLabel.Text = _lastGga.Location.Latitude.ToString("N6");
longitudeValueLabel.Text = _lastGga.Location.Longitude.ToString("N6");
RefreshAltitude();
break;
case "GSA":
_lastGsa = new GsaCommand(data);
RefreshSattellites();
break;
case "GSV":
_lastGsv = _lastGsv + new GsvCommand(data);
RefreshSattellites();
break;
case "RMC":
_lastRmc = new RmcCommand(data);
directionImage.Invalidate();
bearingValueLabel.Text = _lastRmc.DirectionalAngleInDegrees.ToString();
RefreshDistance();
break;
case "GLL":
_lastGll = new GllCommand(data);
break;
default:
System.Diagnostics.Trace.WriteLine("*** " + data.Substring(3, 3) + " Not Handled", "Command");
break;
}
}
private void RefreshAltitude ()
{
float altitude = _lastGga.Location.AltitudeInFeet;
if (altitudeInMetersRadio.Checked)
altitude = _lastGga.Location.AltitudeInMeters;
altitudeValueLabel.Text = altitude.ToString();
}
private void RefreshDistance ()
{
float speed = _lastRmc.Knots;
if (milesPerHourRadio.Checked)
speed = _lastRmc.MilesPerHour;
else if (kilometersPerHourRadio.Checked)
speed = _lastRmc.KilometersPerHour;
speedLabel.Text = speed.ToString("N2");
}
private void RefreshSattellites ()
{
Satellite[] satellites = this.Satellites;
for (int i = 0; i < satellites.Length; i++) {
Satellite sat = satellites[i];
ListViewItem item = sat.Tag as ListViewItem;
if (item == null) {
item = new ListViewItem(new string[] {
sat.Prn.ToString(),
sat.SignalQuality.ToString()
},
satelliteList.Groups[sat.HasFix ? "hasFixGroup" : "doesNotHaveFixGroup"]
);
satelliteList.Items.Add(item);
}
sat.Tag = item;
}
satilliteLocationImage.Invalidate();
}
private void satilliteLocationImage_Paint (object sender, PaintEventArgs e)
{
float centerXF = (float)satilliteLocationImage.Bounds.Width / 2F;
int centerX = satilliteLocationImage.Bounds.Width / 2;
float centerYF = (float)satilliteLocationImage.Bounds.Height / 2F;
int centerY = satilliteLocationImage.Bounds.Height / 2;
float maxRadius = (Math.Min((float)satilliteLocationImage.Bounds.Height, (float)satilliteLocationImage.Bounds.Width) - 20F) / 2F;
using (Pen circlePen = new Pen(Color.DarkBlue, 1)) {
double[] elevations = new double[] { 0, Math.PI / 2, Math.PI / 3, Math.PI / 6 };
foreach (double elevation in elevations) {
float radius = Convert.ToSingle(System.Math.Cos(elevation) * maxRadius);
e.Graphics.DrawEllipse(circlePen, (centerXF - radius), (centerYF - radius), (2F * radius), (2F * radius));
}
e.Graphics.DrawLine(circlePen, new Point(centerX - 4, centerY), new Point(centerX + 4, centerY));
e.Graphics.DrawLine(circlePen, new Point(centerX, centerY - 4), new Point(centerX, centerY + 4));
}
if (_lastGsv == null)
return;
Satellite[] satellites = this.Satellites;
if (satellites != null && satellites.Length > 0) {
using (Pen satellitePen = new Pen(Color.Yellow, 4F)) {
using (Pen hasFixSatellitePen = new Pen(Color.Green, 4F)) {
foreach (Satellite sat in satellites) {
double h = (double)System.Math.Cos((sat.Elevation * Math.PI) / 180D) * maxRadius;
float satX = centerXF + Convert.ToSingle(h * Math.Sin(((float)sat.Azimuth * Math.PI) / 180D));
float satY = centerYF - Convert.ToSingle(h * Math.Cos(((float)sat.Azimuth * Math.PI) / 180D));
e.Graphics.DrawRectangle(sat.HasFix ? hasFixSatellitePen : satellitePen, satX, satY, 4F, 4F);
e.Graphics.DrawString(sat.Prn.ToString(), new Font("Tahoma", 8, FontStyle.Regular), new System.Drawing.SolidBrush(Color.Black), new PointF(satX + 5F, satY + 5F));
}
}
}
}
}
private void directionImage_Paint (object sender, PaintEventArgs e)
{
int centerX = directionImage.Bounds.Width / 2;
int centerY = directionImage.Bounds.Height / 2;
float maxWidth = Math.Min((float)directionImage.Bounds.Height, (float)directionImage.Bounds.Width) - 40F;
float centerXF = (float)directionImage.Bounds.Width / 2F;
float centerYF = (float)directionImage.Bounds.Height / 2F;
float radius = maxWidth / 2F;
e.Graphics.DrawLine(Pens.Black, new Point(0, centerY), new Point(directionImage.Bounds.Width, centerY));
e.Graphics.DrawLine(Pens.Black, new Point(centerX, 0), new Point(centerX, directionImage.Bounds.Height));
e.Graphics.DrawEllipse(Pens.Black, centerXF - (maxWidth / 2F), centerYF - (maxWidth / 2F), maxWidth, maxWidth);
using (Font directionFont = new Font("Tahoma", 12F, FontStyle.Bold)) {
e.Graphics.DrawString("N", directionFont, Brushes.Purple, centerXF, 0F);
e.Graphics.DrawString("S", directionFont, Brushes.Purple, centerXF, directionImage.Bounds.Height - 20);
e.Graphics.DrawString("E", directionFont, Brushes.Purple, directionImage.Bounds.Width - 20, centerYF);
e.Graphics.DrawString("W", directionFont, Brushes.Purple, 0, centerYF);
}
using (Pen anglePen = new Pen(Color.Blue, 4F)) {
e.Graphics.DrawLine(anglePen, new PointF(centerX, centerY), new PointF((radius * Convert.ToSingle(Math.Cos(_lastRmc.DirectionalAngleInRadians))) + centerXF, (radius * Convert.ToSingle(Math.Sin(_lastRmc.DirectionalAngleInRadians))) + centerYF));
}
}
}
}
答案 0 :(得分：0)
编译并试用GPS设备。 GPS系统链接（在codePlex上）基本上连接到gps接收器，从设备获取响应（基于NMEA标准）（例如$GPGSV,2,1,08,01,40,083,46,02,17,308,41,12,07,344,39,14,22,228,45*75），将其拆分为值并显示用适当的标签。就是这样。这段代码的作品（在2007年被废弃），但它不会让你做你想做的事 - 例如实时多用户跟踪。
在我看来，最简单的方式是google geolocation与google maps集成 - 有很多例子。