LibWinUsb/DeviceNotify/Internal/SafeNotifyHandle.cs


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// Copyright � 2006-2010 Travis Robinson. All rights reserved.
// 
// website: http://sourceforge.net/projects/libusbdotnet
// e-mail:  libusbdotnet@gmail.com
// 
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2 of the License, or 
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
// 
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA. or 
// visit www.gnu.org.
// 
// 
using System;
using Microsoft.Win32.SafeHandles;

namespace LibUsbDotNet.DeviceNotify.Internal
{
    internal class SafeNotifyHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        public SafeNotifyHandle()
            : base(true) { }

        public SafeNotifyHandle(IntPtr pHandle)
            : base(true) { SetHandle(pHandle); }

        protected override bool ReleaseHandle()
        {
            if (handle != IntPtr.Zero)
            {
                bool bSuccess = WindowsDeviceNotifier.UnregisterDeviceNotification(handle);
                handle = IntPtr.Zero;
            }
            return true;
        }
    }
}