windows 蓝牙开源工具包分析及C#实例

<buletooh-tool-v2.1.zip>中是使用“Windows Embedded Source Tools for Bluetooth”开发的实例程序。Bluetooth的应用十分广泛，基于Bluetooth的通信程序开发主要有以下几个步骤：服务端* 设置本设备为可发现。* 公开服务给其他Bluetooth设备访问。* 接受其他Bluetooth设备的链接。* 与链接上的Bluetooth设备进行通信。客户端* 发现周边Bluetooth设备。* 主动与被发现的设备发起连接。* 与链接上的Bluetooth设备进行通信。在.NET Compact Framework下进行Bluetooth开发有几个可选解决方案* 可以P/Invoke直接调用Bluetooth的API（btdrt.dll）* 使用MS的Windows Embedded Source Tools for Bluetooth* 使用32feet.NET库这篇文章讲述基于Windows Embedded Source Tools for Bluetooth的开发，点击 链接 下载Windows Embedded Source Tools for Bluetooth，安装后在目录 C:\Program Files\Microsoft\Windows Embedded Source Tools会找到源码以及编译后的DLL。Windows Embedded Source Tools for Bluetooth提供的API总结如下：BluetoothRadio.cs分析：public enum BluetoothRadioMode : int    {        Off,        On,        Discoverable    };API:bool Dispose()     设置蓝牙设备运行被发现或读取当前蓝牙设备是否允许被发现BluetoothRadioMode BluetoothRadioMode()     设置或去读当前蓝牙状态BluetoothDeviceCollection PairedDevices()    获取配对设备集class BluetoothRadio :BluetoothRadio()    初始化蓝牙系统构造类BluetoothEndPoint.cs分析：class BluetoothEndPoint    蓝牙端点构造类。构造时包含deviceAddress ，serviceGuid，port三个值。BluetoothService.cs分析：class BluetoothService：BluetoothService(Guid serviceGuid)    蓝牙服务端构造类，执行该构造类的应该是蓝牙通信中的主设备。void Start()    启动服务void Stop()    停止服务bool Started    获取服务状态，启动或停止bool ConnectionPending     指示是否有一个客户端等待连接到本服务上。NetworkStream AcceptConnection()    接受一个连接，执行该函数后，该函数会挂起直到一个客户端连接上来。Guid ServiceGuid    返回本服务的GUIDStandardServices.cs分析：class StandardServices:StandardServices()    标准的蓝牙服务列表的GUIDGuid     SerialPortServiceGuid    返回串口服务对应的GUIDRegistry.cs分析：class Registry    封装的注册表操作类。SafeNativeMethods.cs分析：class SafeNativeMethods    构造类。导入以下类库的API：const string BTHUTIL_DLL = "bthutil.dll";const string BTDRT_DLL = "btdrt.dll";const string WINSOCK_DLL = "Ws2.dll";const string CORE_DLL = "coredll.dll";BluetoothDeviceCollection.cs分析：class BluetoothDeviceCollection    蓝牙设备集类，实际为一个ArrayList();实测程序例子：服务器端：private void SetRadioMode()        {            BluetoothRadio br = new BluetoothRadio();            //WriteMessage("Radio Mode:" + br.BluetoothRadioMode);            if (br.BluetoothRadioMode != BluetoothRadioMode.Discoverable)            {                br.BluetoothRadioMode = BluetoothRadioMode.Discoverable;                //WriteMessage("Radio Mode:" + br.BluetoothRadioMode);            }        }        private void StartService()        {            Guid guid = StandardServices.SerialPortServiceGuid;            BluetoothService service = new BluetoothService(guid);            service.Start();            //WriteMessage("Service started!");            System.Net.Sockets.NetworkStream ns = service.AcceptConnection(); //Warning: this is blocking code             //WriteMessage("Got a request!");            string dataToSend = "Hello from service!";            // Convert dataToSend into a byte array            byte[] dataBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes(dataToSend);            // Output data to stream            ns.Write(dataBuffer, 0, dataBuffer.Length);            byte[] buffer = new byte[2000];            while (service.Started )//&& !stop)            {                if (ns.DataAvailable)                {                    ns.Read(buffer, 0, 50);                    string data = System.Text.ASCIIEncoding.ASCII.GetString(buffer, 0, 50);                   // WriteMessage("Receiving data:" + data);                }            }            // Clear and close stream            ns.Flush();            ns.Close();        }//////////////////////////////////////////int main(){    SetRadioMode();    StartService();}客户端：private void PairedDevices()        {            BluetoothRadio br = new BluetoothRadio();            BluetoothDeviceCollection devices = br.PairedDevices;            foreach (BluetoothDevice device in devices)            {                WriteMessage("ID:" + device.Address[5].ToString("X2") + "-"                    + device.Address[4].ToString("X2") + "-"                    + device.Address[3].ToString("X2") + "-"                    + device.Address[2].ToString("X2") + "-"                    + device.Address[1].ToString("X2") + "-"                    + device.Address[0].ToString("X2") + ", Name:" + device.Name);            }            ConnectService(devices[0] as BluetoothDevice);        }        private void ConnectService(BluetoothDevice device)        {            Guid guid = StandardServices.SerialPortServiceGuid;            // Create network stream object            // Connect to the device service (via the GUID)            System.Net.Sockets.NetworkStream ns = device.Connect(guid);            // Create storage for receiving data            byte[] buffer = new byte[2000];            byte[] SendBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes("DT\r");            ns.Write(SendBuffer, 0, SendBuffer.Length);            // Read Data            ns.Read(buffer, 0, 50);            // Convert Data to String            string data = System.Text.ASCIIEncoding.ASCII.GetString(buffer, 0, 50);            WriteMessage("Receiving data: " + data);            ////////////////////////////////////////////////////////////            SendBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes("TD\r");            ns.Write(SendBuffer, 0, SendBuffer.Length);            // Read Data            ns.Read(buffer, 0, 50);            // Convert Data to String            data = System.Text.ASCIIEncoding.ASCII.GetString(buffer, 0, 50);            WriteMessage("Receiving data: " + data);            ////////////////////////////////////////////////////////////            int i = 0;            while (true )            {                WriteMessage("Writing: " + i.ToString());                byte[] dataBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes(i.ToString());                ns.Write(dataBuffer, 0, dataBuffer.Length);                ++i;                if (i >= int.MaxValue)                {                    i = 0;                }                System.Threading.Thread.Sleep(500);            }            // Close network stream            ns.Close();        }int main(){    PairedDevices();}特别说明：Windows Embedded Source Tools for Bluetooth不支持自发现功能，所以在客户端的设备首先要和服务端的设备进行配对，所谓配对就是把对端的信息写入注册表里面。PairedDevices()取出配对信息，其实就是从注册表里面取信息，Windows Embedded Source Tools for Bluetooth这个功能也写得不好，如果在wince下使用需要修改BluetoothRadio.cs文件的PairedDevices属性。//const string BT_DEVICE_KEY_NAME = "Software\\Microsoft\\Bluetooth\\Device";const string BT_DEVICE_KEY_NAME = "Software\\Microsoft\\Bluetooth\\Device\\pan"; //wince 5代码4在wince下，注册表的位置取决于配对设备的类型，见下图。图1不同类型的配对设备放在不同的目录下。但是在Windows Mobile下，所有配对信息存放于Software\\Microsoft\\Bluetooth\\Device下。图2ConnectService()的功能是链接服务端的设备。链接前同样选择串口服务，服务端和客户端需要使用统一的服务类型才能通信。在例子中连接后从服务端接收欢迎信息，然后不断往服务端发送数据。从上面的例子看Windows Embedded Source Tools for Bluetooth的功能不是很完整，没有自动发现功能，也就是通信双方在通信之前需要配对成功，因此这样很不方便。而且Windows Embedded Source Tools for Bluetooth只是支持 Microsoft windows stack，不支持broadcom stack，后面文章会介绍另外一个的开源库32feet.NET。这个库支持自发现功能，同时部分支持broadcom stack。以上参考来源： <Windows Moible, Wince 使用.NET Compact Framework的进行蓝牙(Bluetooth)开发 之 Windows Embedded Source Tools for Bluetooth|中国IT实验室>