Discuz.Common/SysInfo.cs

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using System;
using Microsoft.Win32;
using System.Diagnostics;
using System.Runtime.InteropServices;

namespace Discuz.Common
{
	/// <summary>
	/// SysInfo 的摘要说明。
	/// </summary>
	public class SysInfo
	{
		#region CpuUsage类
		/// <summary>
		/// Defines an abstract base class for implementations of CPU usage counters.
		/// </summary>
		public abstract class CpuUsage 
		{
			/// <summary>
			/// Creates and returns a CpuUsage instance that can be used to query the CPU time on this operating system.
			/// </summary>
			/// <returns>An instance of the CpuUsage class.</returns>
			/// <exception cref="NotSupportedException">This platform is not supported -or- initialization of the CPUUsage object failed.</exception>
			public static CpuUsage Create() 
			{
				if (m_CpuUsage == null) 
				{
					if (Environment.OSVersion.Platform == PlatformID.Win32NT)
						m_CpuUsage = new CpuUsageNt();
					else if (Environment.OSVersion.Platform == PlatformID.Win32Windows)
						m_CpuUsage = new CpuUsage9x();
					else
						throw new NotSupportedException();
				}
				return m_CpuUsage;
			}
			/// <summary>
			/// Determines the current average CPU load.
			/// </summary>
			/// <returns>An integer that holds the CPU load percentage.</returns>
			/// <exception cref="NotSupportedException">One of the system calls fails. The CPU time can not be obtained.</exception>
			public abstract int Query();
			/// <summary>
			/// Holds an instance of the CPUUsage class.
			/// </summary>
			private static CpuUsage m_CpuUsage= null;
		}

		//------------------------------------------- win 9x ---------------------------------------

		/// <summary>
		/// Inherits the CPUUsage class and implements the Query method for Windows 9x systems.
		/// </summary>
		/// <remarks>
		/// <p>This class works on Windows 98 and Windows Millenium Edition.</p>
		/// <p>You should not use this class directly in your code. Use the CPUUsage.Create() method to instantiate a CPUUsage object.</p>
		/// </remarks>
		internal sealed class CpuUsage9x : CpuUsage 
		{
			/// <summary>