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==Bluetooth Demo==

<source lang="csharp">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

*/</source>

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