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~

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