Windows系统中使用C#编写蓝牙通信程序的简单实例

现在很多电脑提供了蓝牙支持，很多笔记本网卡也集成了蓝牙功能，也可以采用USB蓝牙方便的连接手机等蓝牙设备进行通信。
操作蓝牙要使用类库InTheHand.Net.Personal
首先在项目中引用该类库；

static void Main(string[] args)
{
  BluetoothRadio bluetoothRadio = BluetoothRadio.PrimaryRadio;
  if (bluetoothRadio == null)
  {
  Console.WriteLine("没有找到本机蓝牙设备!");
  }
  else
  {
  Console.WriteLine("ClassOfDevice: " + bluetoothRadio.ClassOfDevice);
  Console.WriteLine("HardwareStatus: " + bluetoothRadio.HardwareStatus);
  Console.WriteLine("HciRevision: " + bluetoothRadio.HciRevision);
  Console.WriteLine("HciVersion: " + bluetoothRadio.HciVersion);
  Console.WriteLine("LmpSubversion: " + bluetoothRadio.LmpSubversion);
  Console.WriteLine("LmpVersion: " + bluetoothRadio.LmpVersion);
  Console.WriteLine("LocalAddress: " + bluetoothRadio.LocalAddress);
  Console.WriteLine("Manufacturer: " + bluetoothRadio.Manufacturer);
  Console.WriteLine("Mode: " + bluetoothRadio.Mode);
  Console.WriteLine("Name: " + bluetoothRadio.Name);
  Console.WriteLine("Remote:" + bluetoothRadio.Remote);
  Console.WriteLine("SoftwareManufacturer: " + bluetoothRadio.SoftwareManufacturer);
  Console.WriteLine("StackFactory: " + bluetoothRadio.StackFactory);
  }
  Console.ReadKey();
}

如果PC插入了蓝牙适配器，便会显示蓝牙相关信息：

然后我们就要利用蓝牙收发文件了：
前提是蓝牙设备(如手机)已经和PC配对了

public partial class Form1 : Form
{
  BluetoothRadio radio = null;//蓝牙适配器
  string sendFileName = null;//发送文件名
  BluetoothAddress sendAddress = null;//发送目的地址
  ObexListener listener = null;//监听器
  string recDir = null;//接受文件存放目录
  Thread listenThread, sendThread;//发送/接收线程 

  public Form1()
  {
    InitializeComponent();
    radio = BluetoothRadio.PrimaryRadio;//获取当前PC的蓝牙适配器
    CheckForIllegalCrossThreadCalls = false;//不检查跨线程调用
    if (radio == null)//检查该电脑蓝牙是否可用
    {
      MessageBox.Show("这个电脑蓝牙不可用！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    }
    recDir = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
    labelRecDir.Text = recDir;
  } 

  private void buttonSelectBluetooth_Click(object sender, EventArgs e)//选择远程蓝牙设备
  {
    SelectBluetoothDeviceDialog dialog = new SelectBluetoothDeviceDialog();
    dialog.ShowRemembered = true;//显示已经记住的蓝牙设备
    dialog.ShowAuthenticated = true;//显示认证过的蓝牙设备
    dialog.ShowUnknown = true;//显示位置蓝牙设备
    if (dialog.ShowDialog() == DialogResult.OK)
    {
      sendAddress = dialog.SelectedDevice.DeviceAddress;//获取选择的远程蓝牙地址
      labelAddress.Text = "地址:" + sendAddress.ToString() + "  设备名:" + dialog.SelectedDevice.DeviceName;
    }
  } 

  private void buttonSelectFile_Click(object sender, EventArgs e)//选择要发送的本地文件
  {
    OpenFileDialog dialog = new OpenFileDialog();
    if (dialog.ShowDialog() == DialogResult.OK)
    {
      sendFileName = dialog.FileName;//设置文件名
      labelPath.Text = Path.GetFileName(sendFileName);
    }
  } 

  private void buttonSend_Click(object sender, EventArgs e)//发送按钮
  {
    sendThread = new Thread(sendFile);//开启发送文件线程
    sendThread.Start();
  } 

  private void sendFile()//发送文件方法
  {
    ObexWebRequest request = new ObexWebRequest(sendAddress, Path.GetFileName(sendFileName));//创建网络请求
    WebResponse response = null;
    try
    {
      buttonSend.Enabled = false;
      request.ReadFile(sendFileName);//发送文件
      labelInfo.Text = "开始发送!";
      response = request.GetResponse();//获取回应
      labelInfo.Text = "发送完成!";
    }
    catch (System.Exception ex)
    {
      MessageBox.Show("发送失败！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
      labelInfo.Text = "发送失败!";
    }
    finally
    {
      if (response != null)
      {
        response.Close();
        buttonSend.Enabled = true;
      }
    }
  } 

  private void buttonselectRecDir_Click(object sender, EventArgs e)//选择接受目录
  {
    FolderBrowserDialog dialog = new FolderBrowserDialog();
    dialog.Description = "请选择蓝牙接收文件的存放路径";
    if (dialog.ShowDialog() == DialogResult.OK)
    {
      recDir = dialog.SelectedPath;
      labelRecDir.Text = recDir;
    }
  } 

  private void buttonListen_Click(object sender, EventArgs e)//开始/停止监听
  {
    if (listener == null || !listener.IsListening)
    {
      radio.Mode = RadioMode.Discoverable;//设置本地蓝牙可被检测
      listener = new ObexListener(ObexTransport.Bluetooth);//创建监听
      listener.Start();
      if (listener.IsListening)
      {
        buttonListen.Text = "停止";
        labelRecInfo.Text = "开始监听";
        listenThread = new Thread(receiveFile);//开启监听线程
        listenThread.Start();
      }
    }
    else
    {
      listener.Stop();
      buttonListen.Text = "监听";
      labelRecInfo.Text = "停止监听";
    }
  } 

  private void receiveFile()//收文件方法
  {
    ObexListenerContext context = null;
    ObexListenerRequest request = null;
    while (listener.IsListening)
    {
      context = listener.GetContext();//获取监听上下文
      if (context == null)
      {
        break;
      }
      request = context.Request;//获取请求
      string uriString = Uri.UnescapeDataString(request.RawUrl);//将uri转换成字符串
      string recFileName = recDir + uriString;
      request.WriteFile(recFileName);//接收文件
      labelRecInfo.Text = "收到文件" + uriString.TrimStart(new char[] { '/' });
    }
  } 

  private void Form1_FormClosed(object sender, FormClosedEventArgs e)
  {
    if (sendThread != null)
    {
      sendThread.Abort();
    }
    if (listenThread != null)
    {
      listenThread.Abort();
    }
    if (listener != null && listener.IsListening)
    {
      listener.Stop();
    }
  }
}

程序界面：

SelectBluetoothDeviceDialog是一个InTheHand.Net.Personal提供的窗体，用于选择蓝牙设备：

从手机往电脑发送文件需要在电脑上开启监听ObexListener，才能收到文件。

核心代码：

BluetoothRadio radio = null;//蓝牙适配器
string sendFileName = null;//发送文件名
BluetoothAddress sendAddress = null;//发送目的地址
ObexListener listener = null;//监听器
string recDir = null;//接受文件存放目录
Thread listenThread, sendThread;//发送/接收线程 

radio = BluetoothRadio.PrimaryRadio;//获取当前PC的蓝牙适配器 

//关于蓝牙设备选择对话框
SelectBluetoothDeviceDialog dialog = new SelectBluetoothDeviceDialog();
dialog.ShowRemembered = true;//显示已经记住的蓝牙设备
dialog.ShowAuthenticated = true;//显示认证过的蓝牙设备
dialog.ShowUnknown = true;//显示位置蓝牙设备
sendAddress = dialog.SelectedDevice.DeviceAddress;//获取选择的远程蓝牙地址 

//发送文件操作
ObexWebRequest request = new ObexWebRequest(sendAddress, Path.GetFileName(sendFileName));//创建网络请求
WebResponse response = null;
request.ReadFile(sendFileName);//发送文件
response = request.GetResponse();//获取回应
response.Close(); 

//接收文件
radio.Mode = RadioMode.Discoverable;//设置本地蓝牙可被检测
listener = new ObexListener(ObexTransport.Bluetooth);//创建监听
listener.Start();
listener.Stop(); 

ObexListenerContext context = null;
ObexListenerRequest request = null;
context = listener.GetContext();//获取监听上下文
request = context.Request;//获取请求
string uriString = Uri.UnescapeDataString(request.RawUrl);//将uri转换成字符串
string recFileName = recDir + uriString;
request.WriteFile(recFileName);//接收文件
labelRecInfo.Text = "收到文件" + uriString.TrimStart(new char[] { '/' }

PS：关于InTheHand.Net.Personal
InTheHand.Net.Personal.dll来源于32feet.NET。
32feet.NET是shared-source的项目，支持CF.net 2.0以及桌面版本.NET framework，提供短距离领域(personal area networking technologie)的通信功能，支持bluetooth，Infrared(IrDA)红外等. 想了解更多的信息可以参考其 官方主页，其项目的安装包和源码是放在微软的开源工程网站CodePlex上面的，作为.NET开发人员我们必须要上的网站就是CodePlex~