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我最近正在爲我爸爸公司開發GPS軟件。每個卡車司機都在他們的電腦中安裝了一臺筆記本電腦，我正試圖製作一個軟件來定位他們去哪裏。從以前的文章中，我在這裏看到，有「發生在System.dll中GPS跟蹤系統
附加信息：端口‘誰提出這個GPS SYSTEM LINK(codePlex)
型「System.IO.IOException未處理的異常的一個傢伙COM1’呢不存在。」
這是按鈕代碼 。 `
private void connectButton_Click (object sender, EventArgs e)
{
_port.Open();
_timer.Start();
connectButton.Enabled = false;
disconnectButton.Enabled = true;
portList.Enabled = false;
}
，這是形式的整個代碼Link of the code
`
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));
}
}
}
}
您的電腦中沒有COM1？你可能想要檢查你是否有：http://superuser.com/questions/835848/how-to-view-serial-com-ports-but-not-through-device-manager如果沒有，買一些。 – rene
GPS設備是否插入？編輯：您可以將USB設備端口暴露爲COM1，但它不是真的推薦。 –
@ VytautasPlečkaitis，通過使用與微軟，谷歌或其他軟件使用的系統相同的系統來找到您的電腦。例如，如果您連接到互聯網，「獵物項目」會檢測您的確切位置。筆記本電腦將連接到互聯網，因此，正在跳躍做類似的事情。 – DezUp