@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm @powerstatus=http://msdn.microsoft.com/en-us/library/system.windows.forms.powerstatus.aspx @powerlinestatus=http://msdn.microsoft.com/en-us/library/system.windows.systemparameters.powerlinestatus.aspx Summary: The GetSystemPowerStatus API !!!!C# Signature: [DllImport("kernel32.dll")] static extern bool GetSystemPowerStatus(out SYSTEM_POWER_STATUS lpSystemPowerStatus); !!!!User-Defined Types: [SYSTEM_POWER_STATUS] !!!!Notes: None. !!!!Tips & Tricks: Please add some! !!!!Sample Code: // C# Example by Matt Henry (henrym@sytexinc.com) // using System; using System.Runtime.InteropServices; // Necessary! namespace MyNamespace { /// <summary> /// Summary description for BatteryChecker. /// </summary> public class BatteryChecker { public BatteryChecker() { // Nothing } [DllImport("Kernel32")] private static extern Boolean GetSystemPowerStatus( SystemPowerStatus sps ); public static SystemPowerStatus GetSystemPowerStatus() { SystemPowerStatus sps = new SystemPowerStatus(); GetSystemPowerStatus( sps ); return sps; } } public enum ACLineStatus : byte { Offline = 0, Online = 1, Unknown = 255 } public enum BatteryFlag : byte { High = 1, Low = 2, Critical = 4, Charging = 8, NoSystemBattery = 128, Unknown = 255 } // Fields must mirror their unmanaged counterparts, in order [StructLayout( LayoutKind.Sequential )] public class SystemPowerStatus { public ACLineStatus _ACLineStatus; public BatteryFlag _BatteryFlag; public Byte _BatteryLifePercent; public Byte _Reserved1; public Int32 _BatteryLifeTime; public Int32 _BatteryFullLifeTime; } } !!!!Sample Code: // C# Example by Matt Wise (matt.wise@narfsoft.com) // // There is not much functional diffrence between the above example, this would just be simpler class to implement. using System; using System.Runtime.InteropServices; class SystemPower { [DllImport("kernel32.dll", SetLastError = true)] private static extern Boolean GetSystemPowerStatus(out SystemPowerStatus sps); private enum ACLineStatus : byte { Offline = 0, Online = 1, Unknown = 255 } private enum BatteryFlag : byte { High = 1, Low = 2, Critical = 4, Charging = 8, NoSystemBattery = 128, Unknown = 255 } private struct SystemPowerStatus { public ACLineStatus LineStatus; public BatteryFlag flgBattery; public Byte BatteryLifePercent; public Byte Reserved1; public Int32 BatteryLifeTime; public Int32 BatteryFullLifeTime; } /// <summary> /// Returns true if a an AC Power Line is detected /// </summary> public static Boolean ACPowerPluggedIn() { SystemPowerStatus SPS = new SystemPowerStatus(); GetSystemPowerStatus(out SPS); if (SPS.LineStatus == ACLineStatus.Online) { return true; } else { return false; } } /// <summary> /// Returns an integer representing the percent of battery charge remaining. /// </summary> public static Int32 BatteryCharge() { SystemPowerStatus SPS = new SystemPowerStatus(); GetSystemPowerStatus(out SPS); return (Int32)SPS.BatteryLifePercent; } } !!!!Alternative Managed API: * In WinForms: System.Windows.Forms.PowerStatus@powerstatus * In WPF: System.Windows.SystemParameters.PowerLineStatus@powerlinestatus Documentation: GetSystemPowerStatus@msdn on MSDN
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