蓝牙串行端口 (SPP) 传入端口创建

Bluetooth Serial Port (SPP) incoming port creation

我有一个定制的蓝牙设备,我可以使用 windows10 与之配对和连接,它创建了 2 个 com 端口 - 一个列为传入端口,一个列为传出端口。

当我使用 32Feet C# 蓝牙库连接时,我能够发现并配对设备并启用 SPP 配置文件,但是,唉,我只有一个 COM 端口,它被列为 "outgoing"。

我需要使用其他人的代码连接到设备,并且需要提供一个 com 端口号。不幸的是,它想连接到 "incoming" 端口。

因此我的问题是我需要什么魔法来创建这个传入的 com 端口?我查看了 32Feet 代码和 BluetoothSetServiceState(...) 的底层 API 调用,它似乎没有任何参数来控制端口的创建方式。此功能是否有其他配置文件?

您必须使用 BluetoothAPIs.dll

中未记录的 InstallIncomingComPort 函数
private const UInt16 BLUETOOTH_MAX_SERVICE_NAME_SIZE = 256;
private const UInt16 BLUETOOTH_DEVICE_NAME_SIZE  = 256;

private static Guid SerialPortServiceClass_UUID = new Guid("{00001101-0000-1000-8000-00805F9B34FB}");

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
private struct BLUETOOTH_LOCAL_SERVICE_INFO
{
            public Boolean Enabled;
            public Int64 btAddr;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = BLUETOOTH_MAX_SERVICE_NAME_SIZE)]
            public String szName;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = BLUETOOTH_DEVICE_NAME_SIZE)]
            public String szDeviceString;
};

[DllImport("BluetoothAPIs.dll", CallingConvention = CallingConvention.StdCall, SetLastError = true)]
private static extern UInt32 BluetoothSetLocalServiceInfo(IntPtr hRadioIn, ref Guid pClassGuid, UInt32 ulInstance, ref BLUETOOTH_LOCAL_SERVICE_INFO pServiceInfoIn);

private void CreateComPort(Boolean Create)
{
            BLUETOOTH_LOCAL_SERVICE_INFO s = new BLUETOOTH_LOCAL_SERVICE_INFO();
            s.btAddr = 0;
            s.Enabled = Create;
            s.szName = "MyComPort";
            s.szDeviceString = "COM10";

            UInt32 Res = BluetoothSetLocalServiceInfo(IntPtr.Zero,
                ref SerialPortServiceClass_UUID, 1, ref s);
            MessageBox.Show(Res.ToString());
}

如果您想使用 InTheHand BT 库并获得传入的 com 端口,您可以将以下代码添加到函数的底部

public void SetServiceState(Guid service, bool state, bool throwOnError)

在WindowsBlurtoothDeviceInfo.cs

if (service == BluetoothService.SerialPort)
{
    NativeMethods.BLUETOOTH_LOCAL_SERVICE_INFO s = new NativeMethods.BLUETOOTH_LOCAL_SERVICE_INFO();
    s.btAddr = deviceInfo.Address;
    s.Enabled = state;
    s.szName = "RemScan";
    s.szDeviceString = "COM10";
    UInt32 Res = NativeMethods.BluetoothSetLocalServiceInfo(IntPtr.Zero, ref NativeMethods.SerialPortServiceClass_UUID, 1, ref s);
}