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  1. 2006.09.13 PDA 전원 정보

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace AZKI
{
  public partial class MainForm : Form
  {
       // p/invoke signature
       [DllImport("coredll.dll", EntryPoint = "GetSystemPowerStatusEx2", SetLastError = true)]
       public extern static Int32 GetSystemPowerStatus(
                                                       ref PowerStatus powerStatus,
                                                       Int32 length,
                                                       Boolean update);

       //  SYSTEM_POWER_STATUS_EX2.ACLineStatus
       public enum ACLineStatus : byte
       {
           Offline = 0,
           Online = 1,
           Unknown = 255,
       }
       // managed version of the SYSTEM_POWER_STATUS_EX2 structure
       public struct PowerStatus
       {
           public ACLineStatus ACLineState;
           public Byte BatteryFlag;
           public Byte BatteryLifePercent;
           public Byte Reserved1;
           public Int32 BatteryLifeTime;
           public Int32 BatteryFullLifeTime;
           public Byte Reserved2;
           public Byte BackupBatteryFlag;
           public Byte BackupBatteryLifePercent;
           public Byte Reserved3;
           public Int32 BackupBatteryLifeTime;
           public Int32 BackupBatteryFullLifeTime;
           public Int32 BatteryVoltage;
           public Int32 BatteryCurrent;
           public Int32 BatteryAverageCurrent;
           public Int32 BatteryAverageInterval;
           public Int32 BatterymAHourConsumed;
           public Int32 BatteryTemperature;
           public Int32 BackupBatteryVoltage;
           public Byte BatteryChemistry;
       }

       private void button1_Click(object sender, EventArgs e)
       {
           PowerStatus myPowerStatus = new PowerStatus();
           // query the device's power status
           Int32 result = GetSystemPowerStatus(ref myPowerStatus,
               Marshal.SizeOf(myPowerStatus),
               true);
           if (!result.Equals(0))
           {
               MessageBox.Show("Ac Line: " +
                   myPowerStatus.ACLineState.ToString());
               MessageBox.Show("Remain: " +
                   myPowerStatus.BatteryLifePercent + "%");
           }
       }
   }
}

컴팩트 프레임워크에서 PDA의 전원(power) 정보를 알아볼 수 있는 팁.
구조체 정보 등은 아래를 참조.
참조: Windows CE .NET SDK documentation (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceui40/html/cerefsystem_power_status_ex2.asp)

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