C# WindowsAPI蓝牙链接通信例程

好的，以下是一个简单的 C# Windows API 蓝牙连接和通信的示例代码：

using System;
using System.Runtime.InteropServices;

namespace BluetoothExample
{
    class Program
    {
        // 定义Windows API中的GUID和结构体
        [StructLayout(LayoutKind.Sequential)]
        public struct BLUETOOTH_DEVICE_SEARCH_PARAMS
        {
            public int dwSize;
            public bool fReturnAuthenticated;
            public bool fReturnRemembered;
            public bool fReturnUnknown;
            public bool fReturnConnected;
            public bool fIssueInquiry;
            public byte cTimeoutMultiplier;
            public IntPtr hRadio;
        }

        [DllImport("BluetoothAPIs.dll", SetLastError = true)]
        public static extern IntPtr BluetoothFindFirstDevice(ref BLUETOOTH_DEVICE_SEARCH_PARAMS pbtsp, ref BLUETOOTH_DEVICE_INFO pbtdi);

        [DllImport("BluetoothAPIs.dll", SetLastError = true)]
        public static extern bool BluetoothFindNextDevice(IntPtr hFind, ref BLUETOOTH_DEVICE_INFO pbtdi);

        [DllImport("BluetoothAPIs.dll", SetLastError = true)]
        public static extern bool BluetoothFindDeviceClose(IntPtr hFind);

        [DllImport("irprops.cpl", SetLastError = true)]
        public static extern int BluetoothAuthenticateDevice(IntPtr hwndParent, IntPtr hRadio, ref BLUETOOTH_DEVICE_INFO pbtdi, string pszPasskey, uint ulPasskeyLength);

        [DllImport("irprops.cpl", SetLastError = true)]
        public static extern int BluetoothSendAuthenticationResponse(IntPtr hwndParent, IntPtr hRadio, ref BLUETOOTH_DEVICE_INFO pbtdi, string pszPasskey);

        [DllImport("irprops.cpl", SetLastError = true)]
        public static extern int BluetoothSetServiceState(IntPtr hRadio, ref BLUETOOTH_DEVICE_INFO pbtdi, ref Guid guid, bool fMarkAsEnabled);

        [StructLayout(LayoutKind.Sequential)]
        public struct BLUETOOTH_DEVICE_INFO
        {
            public int dwSize;
            public long Address;
            public uint ulClassofDevice;
            public bool fConnected;
            public bool fRemembered;
            public bool fAuthenticated;
            public SYSTEMTIME stLastSeen;
            public SYSTEMTIME stLastUsed;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 248)]
            public string szName;
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct SYSTEMTIME
        {
            public short wYear;
            public short wMonth;
            public short wDayOfWeek;
            public short wDay;
            public short wHour;
            public short wMinute;
            public short wSecond;
            public short wMilliseconds;
        }

        // 定义蓝牙设备GUID
        static Guid SerialPortServiceClass_UUID = new Guid("{00001101-0000-1000-8000-00805F9B34FB}");

        static void Main(string[] args)
        {
            // 初始化BLUETOOTH_DEVICE_SEARCH_PARAMS结构体
            BLUETOOTH_DEVICE_SEARCH_PARAMS search_params = new BLUETOOTH_DEVICE_SEARCH_PARAMS();
            search_params.dwSize = Marshal.SizeOf(typeof(BLUETOOTH_DEVICE_SEARCH_PARAMS));
            search_params.fReturnAuthenticated = true;
            search_params.fReturnRemembered = true;
            search_params.fReturnUnknown = true;
            search_params.fReturnConnected = true;
            search_params.fIssueInquiry = true;
            search_params.cTimeoutMultiplier = 2;
            search_params.hRadio = IntPtr.Zero;

            // 初始化BLUETOOTH_DEVICE_INFO结构体
            BLUETOOTH_DEVICE_INFO device_info = new BLUETOOTH_DEVICE_INFO();
            device_info.dwSize = Marshal.SizeOf(typeof(BLUETOOTH_DEVICE_INFO));

            // 查找蓝牙设备
            IntPtr search_handle = BluetoothFindFirstDevice(ref search_params, ref device_info);
            if (search_handle != IntPtr.Zero)
            {
                do
                {
                    Console.WriteLine("找到蓝牙设备: " + device_info.szName);

                    // 进行身份验证
                    int result = BluetoothAuthenticateDevice(IntPtr.Zero, search_params.hRadio, ref device_info, null, 0);
                    if (result == 0)
                    {
                        Console.WriteLine("身份验证成功");

                        // 开启蓝牙串口服务
                        bool service_enabled = BluetoothSetServiceState(search_params.hRadio, ref device_info, ref SerialPortServiceClass_UUID, true);
                        if (service_enabled)
                        {
                            Console.WriteLine("蓝牙串口服务已开启");

                            // 发送数据
                            byte[] data = new byte[] { 0x41, 0x42, 0x43, 0x44 };
                            // TODO: 在这里实现数据发送代码

                            // 关闭蓝牙串口服务
                            service_enabled = BluetoothSetServiceState(search_params.hRadio, ref device_info, ref SerialPortServiceClass_UUID, false);
                            if (service_enabled)
                            {
                                Console.WriteLine("蓝牙串口服务已关闭");
                            }
                        }
                        else
                        {
                            Console.WriteLine("蓝牙串口服务开启失败");
                        }
                    }
                    else
                    {
                        Console.WriteLine("身份验证失败");
                    }

                } while (BluetoothFindNextDevice(search_handle, ref device_info));

                BluetoothFindDeviceClose(search_handle);
            }
            else
            {
                Console.WriteLine("未找到蓝牙设备");
            }

            Console.ReadLine();
        }
    }
}

需要注意的是，这只是一个简单的示例代码，实际应用中需要根据具体的设备和场景进行适当的修改和调整。