基于C#实现的WiFi信号强度扫描程序
<div id="navCategory"><h5 class="catalogue">目录</h5><ul class="first_class_ul"><li>一、核心功能实现</li><li>二、关键功能说明</li><ul class="second_class_ul"><li>1. 信号强度检测</li><li>2. 距离估算算法</li><li>3. 实时监控界面（WinForm示例）</li></ul><li>三、工程实践要点</li><ul class="second_class_ul"><li>1. 权限配置</li><li>2. 性能优化</li><li>3. 高级功能扩展</li></ul><li>四、部署与使用</li><ul class="second_class_ul"><li>1. NuGet依赖</li><li>2. 运行示例</li></ul><li>五、调试与校准</li><ul class="second_class_ul"><li>1. 日志记录</li><li>2. 精度校准</li></ul><li>六、界面增强建议</li><ul class="second_class_ul"></ul></ul></div><p>基于C#实现的WiFi信号强度扫描程序，信号强度检测、距离估算和实时监控功能：</p><p class="maodian"></p><h2>一、核心功能实现</h2>
<div class="jb51code"><pre class="brush:csharp;">using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.NetworkInformation;
using System.Runtime.InteropServices;
using System.Timers;
using SimpleWifi;
public class WifiScanner : IDisposable
{
private Wifi _wifi;
private Timer _scanTimer;
private Dictionary<string, (int rssi, double distance)> _scanResults = new();
public event EventHandler<ScanResultsUpdatedEventArgs> ResultsUpdated;
public WifiScanner()
{
_wifi = new Wifi();
InitializeScanTimer(5000); // 每5秒扫描一次
}
// 初始化定时扫描
private void InitializeScanTimer(int interval)
{
_scanTimer = new Timer(interval);
_scanTimer.Elapsed += async (s, e) => await ScanNetworks();
}
// 执行扫描操作
private async Task ScanNetworks()
{
try
{
var accessPoints = await _wifi.GetAccessPointsAsync();
var results = new List<ScanResult>();
foreach (var ap in accessPoints)
{
if (ap.SignalStrength > -100) // 过滤无效信号
{
double distance = CalculateDistance(ap.SignalStrength);
results.Add(new ScanResult
{
SSID = ap.Name,
RSSI = ap.SignalStrength,
Distance = distance,
Channel = ap.Channel,
Security = ap.IsSecure
});
}
}
_scanResults = results.ToDictionary(x => x.SSID, x => (x.RSSI, x.Distance));
ResultsUpdated?.Invoke(this, new ScanResultsUpdatedEventArgs(_scanResults.Values.ToList()));
}
catch (Exception ex)
{
HandleScanError(ex);
}
}
// 信号强度转距离估算（经验公式）
private double CalculateDistance(int rssi)
{
const double referenceDistance = 1.0; // 参考距离（米）
const int referenceRSSI = -30; // 参考信号强度
if (rssi >= referenceRSSI) return 0.1; // 过近时返回固定值
double pathLoss = referenceRSSI - rssi;
return Math.Pow(10, pathLoss / 20) * referenceDistance;
}
// 显示结果
public void DisplayResults()
{
Console.WriteLine("WiFi信号扫描结果:");
foreach (var result in _scanResults.Values)
{
Console.WriteLine($"SSID: {result.SSID,-15} " +
$"信号强度: {result.RSSI}dBm " +
$"估算距离: {result.Distance.ToString("0.1f")}m " +
$"信道: {result.Channel} " +
$"加密: {(result.Security ? "是" : "否")}");
}
}
// 释放资源
public void Dispose()
{
_scanTimer?.Dispose();
_wifi?.Dispose();
}
}
public class ScanResult
{
public string SSID { get; set; }
public int RSSI { get; set; }
public double Distance { get; set; }
public int Channel { get; set; }
public bool Security { get; set; }
}
public class ScanResultsUpdatedEventArgs : EventArgs
{
public List<ScanResult> Results { get; }
public ScanResultsUpdatedEventArgs(List<ScanResult> results)
{
Results = results;
}
}
</pre></div>
<p class="maodian"></p><h2>二、关键功能说明</h2>
<p class="maodian"></p><h3>1. 信号强度检测</h3>
<div class="jb51code"><pre class="brush:csharp;">// 获取所有可用网络
var accessPoints = await _wifi.GetAccessPointsAsync();
// 解析关键信息
foreach (var ap in accessPoints)
{
Console.WriteLine($"SSID: {ap.Name}");
Console.WriteLine($"信号强度: {ap.SignalStrength}%"); // 百分比强度
Console.WriteLine($"实际dBm值: {ConvertToDbm(ap.SignalStrength)}dBm");
}
// 百分比转dBm转换方法
private int ConvertToDbm(int percentage)
{
return (int)((percentage / 2.0) - 100);
}
</pre></div>
<p class="maodian"></p><h3>2. 距离估算算法</h3>
<div class="jb51code"><pre class="brush:csharp;">// 改进型距离估算（考虑环境因素）
private double CalculateDistance(int rssi)
{
const double txPower = -59; // 发射功率（dBm）
const double n = 2.7; // 路径损耗指数
double ratio = rssi * 1.0 / txPower;
if (ratio < 1) return Math.Pow(ratio, 10);
else return 0.89976 * Math.Pow(ratio, 7.7095) + 0.111;
}
</pre></div>
<p class="maodian"></p><h3>3. 实时监控界面（WinForm示例）</h3>
<div class="jb51code"><pre class="brush:csharp;">public partial class MainForm : Form
{
private WifiScanner _scanner;
private DataGridView _dataGridView;
public MainForm()
{
InitializeComponent();
InitializeComponents();
_scanner = new WifiScanner();
_scanner.ResultsUpdated += OnResultsUpdated;
}
private void InitializeComponents()
{
_dataGridView = new DataGridView { Dock = DockStyle.Fill };
_dataGridView.Columns.AddRange(
new DataGridViewTextBoxColumn { Name = "SSID", HeaderText = "网络名称" },
new DataGridViewTextBoxColumn { Name = "SignalStrength", HeaderText = "信号强度(dBm)" },
new DataGridViewTextBoxColumn { Name = "Distance", HeaderText = "估算距离(m)" }
);
Controls.Add(_dataGridView);
}
private void OnResultsUpdated(object sender, ScanResultsUpdatedEventArgs e)
{
_dataGridView.Invoke((MethodInvoker)delegate {
_dataGridView.DataSource = e.Results;
});
}
}
</pre></div>
<p class="maodian"></p><h2>三、工程实践要点</h2>
<p class="maodian"></p><h3>1. 权限配置</h3>
<div class="jb51code"><pre class="brush:xml;"><!-- app.manifest -->
<requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
</pre></div>
<p class="maodian"></p><h3>2. 性能优化</h3>
<ul><li><strong>批量扫描</strong>：合并多个扫描结果减少系统调用</li><li><strong>数据缓存</strong>：使用<code>ConcurrentDictionary</code>存储历史数据</li><li><strong>异步处理</strong>：采用<code>async/await</code>避免界面卡顿</li></ul>
<p class="maodian"></p><h3>3. 高级功能扩展</h3>
<div class="jb51code"><pre class="brush:csharp;">// 信道干扰分析
public Dictionary<int, int> GetChannelUtilization()
{
return _scanResults.Values
.GroupBy(x => x.Channel)
.ToDictionary(g => g.Key, g => g.Count());
}
// 热力图生成
public Bitmap GenerateHeatmap()
{
// 使用GDI+绘制信号强度分布
}
</pre></div>
<p class="maodian"></p><h2>四、部署与使用</h2>
<p class="maodian"></p><h3>1. NuGet依赖</h3>
<div class="jb51code"><pre class="brush:bash;">Install-Package SimpleWifi.netstandard.Lsh
Install-Package LiveCharts.WinForms
</pre></div>
<p class="maodian"></p><h3>2. 运行示例</h3>
<div class="jb51code"><pre class="brush:csharp;">var scanner = new WifiScanner();
scanner.ResultsUpdated += (s, e) =>
{
Console.WriteLine($"检测到 {e.Results.Count} 个网络");
e.Results.OrderByDescending(r => r.SignalStrength).Take(3).ToList().ForEach(r =>
Console.WriteLine($"最强信号: {r.SSID} ({r.SignalStrength}dBm)"));
};
scanner.StartContinuousScan();
</pre></div>
<p class="maodian"></p><h2>五、调试与校准</h2>
<p class="maodian"></p><h3>1. 日志记录</h3>
<div class="jb51code"><pre class="brush:csharp;">public static class Logger
{
public static void LogSignalData(int rssi, double distance)
{
File.AppendAllText("wifi_log.txt",
$"{DateTime.Now:yyyy-MM-dd HH:mm:ss} | RSSI:{rssi} | Distance:{distance}m\n");
}
}
</pre></div>
<p class="maodian"></p><h3>2. 精度校准</h3>
<div class="jb51code"><pre class="brush:csharp;">// 校准参数
private static double _calibrationFactor = 1.2;
// 带校准的距离计算
public double CalibratedDistance(int rssi)
{
double rawDistance = CalculateDistance(rssi);
return rawDistance * _calibrationFactor;
}
</pre></div>
<p>参考代码 WIFI Distance（Wifi信号强弱扫描程序） www.youwenfan.com/contentcsn/93530.html</p>
<p class="maodian"></p><h2>六、界面增强建议</h2>
<p><strong>信号强度可视化</strong></p>
<div class="jb51code"><pre class="brush:csharp;">// 使用LiveCharts绘制实时波形
var chart = new CartesianChart();
chart.Series = new SeriesCollection
{
new LineSeries
{
Values = new ChartValues<double>(_scanResults.Values.Select(x => x.SignalStrength))
}
};
</pre></div>
<p><strong>设备定位功能</strong></p>
<div class="jb51code"><pre class="brush:csharp;">public Point CalculatePosition()
{
// 三角定位算法实现
var accessPoints = _scanResults.Values.ToList();
if (accessPoints.Count < 3) return Point.Empty;
// 实现三边测量算法...
}
</pre></div>
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