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Bluetooth Demo

using System; using System.Runtime.InteropServices; using System.Runtime.ConstrainedExecution; using System.Security; using System.Security.Permissions; using System.Text; using Microsoft.Win32.SafeHandles; // // Matches Win32 BLUETOOTH_FIND_RADIO_PARAMS // [StructLayout( LayoutKind.Sequential )] class BluetoothFindRadioParams {     public BluetoothFindRadioParams() {         dwSize = 4;     }     public UInt32 dwSize; } // // Matches Win32 BLUETOOTH_RADIO_INFO // [StructLayout( LayoutKind.Sequential,                CharSet = CharSet.Unicode )] struct BluetoothRadioInfo {     public const int BLUETOOTH_MAX_NAME_SIZE = 248;     public UInt32 dwSize;     public UInt64 address;     [MarshalAs( UnmanagedType.ByValTStr,                 SizeConst = BLUETOOTH_MAX_NAME_SIZE )]     public string szName;     public UInt32 ulClassOfDevice;     public UInt16 lmpSubversion;     public UInt16 manufacturer; } // // Safe Bluetooth Enumeration Handle // [SecurityPermission( SecurityAction.Demand,                      UnmanagedCode = true )] sealed public class SafeBluetoothRadioFindHandle     : SafeHandleZeroOrMinusOneIsInvalid {     private SafeBluetoothRadioFindHandle() : base( true ) { }     override protected bool ReleaseHandle() {         return BluetoothFindRadioClose( handle );     }     [DllImport( "Irprops.cpl" )]     [ReliabilityContract( Consistency.WillNotCorruptState,                           Cer.Success )]     [SuppressUnmanagedCodeSecurity]     private static extern bool BluetoothFindRadioClose(                                               IntPtr hFind ); } public class EntryPoint {     private const int ERROR_SUCCESS = 0;     static void Main() {         SafeFileHandle radioHandle;         using( SafeBluetoothRadioFindHandle radioFindHandle             = BluetoothFindFirstRadio(new BluetoothFindRadioParams(),                                       out radioHandle) ) {             if( !radioFindHandle.IsInvalid ) {                 BluetoothRadioInfo radioInfo = new BluetoothRadioInfo();                 radioInfo.dwSize = 520;                 UInt32 result = BluetoothGetRadioInfo( radioHandle,                                                        ref radioInfo );                 if( result == ERROR_SUCCESS ) {                     // Let's send the contents of the radio info to the                     // console.                     Console.WriteLine( "address = {0:X}",                                        radioInfo.address );                     Console.WriteLine( "szName = {0}",                                        radioInfo.szName );                     Console.WriteLine( "ulClassOfDevice = {0}",                                        radioInfo.ulClassOfDevice );                     Console.WriteLine( "lmpSubversion = {0}",                                        radioInfo.lmpSubversion );                     Console.WriteLine( "manufacturer = {0}",                                        radioInfo.manufacturer );                 }                 radioHandle.Dispose();             }         }     }     [DllImport( "Irprops.cpl" )]     private static extern SafeBluetoothRadioFindHandle         BluetoothFindFirstRadio( [MarshalAs(UnmanagedType.LPStruct)]                                  BluetoothFindRadioParams pbtfrp,                                  out SafeFileHandle phRadio );     [DllImport( "Irprops.cpl" )]     private static extern UInt32         BluetoothGetRadioInfo( SafeFileHandle hRadio,                                ref BluetoothRadioInfo pRadioInfo ); } /*Quote from:  Book Accelerated C# 2005     * By Trey Nash     * ISBN: 1-59059-717-6     * 432 pp.     * Published: Aug 2006     * Price: $39.99 */