powerstatus.cs

功能：基于windows mobile 的地图查看器。使用vs2005开发

using System;
using System.Runtime.InteropServices;

namespace PInvokeLibrary
{
	/// <summary>
	/// Provides access to the device's power and battery status.
	/// </summary>
	public class PowerStatus
	{
		// ACLineStatus
		public const byte AC_LINE_OFFLINE = 0x00;
		public const byte AC_LINE_ONLINE = 0x01;
		public const byte AC_LINE_BACKUP_POWER = 0x02;
		public const byte AC_LINE_UNKNOWN = 0xFF;

		// BatteryFlag and BackupBatteryFlag
		public const byte BATTERY_FLAG_HIGH = 0x01;
		public const byte BATTERY_FLAG_LOW = 0x02;
		public const byte BATTERY_FLAG_CRITICAL = 0x04;
		public const byte BATTERY_FLAG_CHARGING = 0x08;
		public const byte BATTERY_FLAG_NO_BATTERY = 0x80;
		public const byte BATTERY_FLAG_UNKNOWN = 0xFF;

		// BatteryLifePercent and BackupBatteryLifePercent
		public const byte BATTERY_PERCENTAGE_UNKNOWN = 0xFF;

		// BatteryLifeTime, BatteryFullLifeTime, BackupBatteryLifeTime, and BackupBatteryFullLifeTime
		public const uint BATTERY_LIFE_UNKNOWN = 0xFFFFFFFF;

		// BatteryChemistry
		public const byte BATTERY_CHEMISTRY_ALKALINE = 0x01;
		public const byte BATTERY_CHEMISTRY_NICD = 0x02;
		public const byte BATTERY_CHEMISTRY_NIMH = 0x03;
		public const byte BATTERY_CHEMISTRY_LION = 0x04;
		public const byte BATTERY_CHEMISTRY_LIPOLY = 0x05;
		public const byte BATTERY_CHEMISTRY_UNKNOWN = 0xFF;

		/// <summary>
		/// This structure contains information about the power status of the system.
		///		typedef struct _SYSTEM_POWER_STATUS_EX2 
		///		{
		///			BYTE ACLineStatus;
		///			BYTE BatteryFlag;
		///			BYTE BatteryLifePercent;
		///			BYTE Reserved1;
		///			DWORD BatteryLifeTime;
		///			DWORD BatteryFullLifeTime;
		///			BYTE Reserved2;
		///			BYTE BackupBatteryFlag;
		///			BYTE BackupBatteryLifePercent;
		///			BYTE Reserved3;
		///			DWORD BackupBatteryLifeTime;
		///			DWORD BackupBatteryFullLifeTime;
		///			DWORD BatteryVoltage;
		///			DWORD BatteryCurrent;
		///			DWORD BatteryAverageCurrent;
		///			DWORD BatteryAverageInterval;
		///			DWORD BatterymAHourConsumed;
		///			DWORD BatteryTemperature;
		///			DWORD BackupBatteryVoltage;
		///			BYTE BatteryChemistry;
		///		} SYSTEM_POWER_STATUS_EX2, *PSYSTEM_POWER_STATUS_EX2,
		///		  *LPSYSTEM_POWER_STATUS_EX2;
		/// </summary>
		public class SYSTEM_POWER_STATUS_EX2
		{
			/// <summary>
			/// AC power status.
			/// </summary>
			public byte ACLineStatus;
			/// <summary>
			/// Battery charge status.
			/// </summary>
			public byte BatteryFlag;
			/// <summary>
			/// Percentage of full battery charge remaining. This member can be a value
			/// in the range 0 to 100, or 255 if the status is unknown. All other values
			/// are reserved.
			/// </summary>
			public byte BatteryLifePercent;
			/// <summary>
			/// Reserved; set to zero.
			/// </summary>
			public byte Reserved1;
			/// <summary>
			/// Number of seconds of battery life remaining, or 0xFFFFFFFF if remaining
			/// seconds are unknown.
			/// </summary>
			public uint BatteryLifeTime;
			/// <summary>
			/// Number of seconds of battery life when at full charge, or 0xFFFFFFFF if
			/// full battery lifetime is unknown.
			/// </summary>
			public uint BatteryFullLifeTime;
			/// <summary>
			/// Reserved; set to zero.
			/// </summary>
			public byte Reserved2;
			/// <summary>
			/// Backup battery charge status.
			/// </summary>
			public byte BackupBatteryFlag;
			/// <summary>
			/// Percentage of full backup battery charge remaining. This value must
			/// be in the range 0 to 100, or BATTERY_PERCENTAGE_UNKNOWN. 
			/// </summary>
			public byte BackupBatteryLifePercent;
			/// <summary>
			/// Reserved; set to zero.
			/// </summary>
			public byte Reserved3;
			/// <summary>
			/// Number of seconds of backup battery life remaining, or
			/// BATTERY_LIFE_UNKNOWN if remaining seconds are unknown.
			/// </summary>
			public uint BackupBatteryLifeTime;
			/// <summary>
			/// Number of seconds of backup battery life when at full charge, or
			/// BATTERY_LIFE_UNKNOWN if full battery lifetime is unknown.
			/// </summary>
			public uint BackupBatteryFullLifeTime;
			/// <summary>
			/// Amount of battery voltage in millivolts (mV). This member can have
			/// a value in the range of 0 to 65,535.
			/// </summary>
			public uint BatteryVoltage;
			/// <summary>
			/// Amount of instantaneous current drain in milliamperes (mA). This member
			/// can have a value in the range of 0 to 32,767 for charge, or 0 to
			///