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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 System.Runtime.InteropServices;
namespace LibUsbDotNet.Main
{
/// <summary>
/// Base class for all critial handles.
/// </summary>
public abstract class SafeContextHandle : SafeHandle
{
/// <summary>
///
/// </summary>
/// <param name="pHandle"></param>
/// <param name="ownsHandle"></param>
protected SafeContextHandle(IntPtr pHandle, bool ownsHandle)
: base(IntPtr.Zero, ownsHandle) { SetHandle(pHandle); }
/// <summary>
///
/// </summary>
/// <param name="pHandleToOwn"></param>
protected SafeContextHandle(IntPtr pHandleToOwn)
: this(pHandleToOwn, true) { }
/// <summary>
/// Gets a value indicating whether the handle value is invalid.
/// </summary>
/// <returns>
/// true if the handle value is invalid; otherwise, false.
/// </returns>
/// <PermissionSet><IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Flags="UnmanagedCode"/></PermissionSet>
public override bool IsInvalid
{
get
{
if (handle != IntPtr.Zero)
{
return (handle == new IntPtr(-1));
}
return true;
}
}
}
}
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