@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: Sets or retrieves power information. !!!!C# Signature: [DllImport("powrprof.dll", SetLastError=true)] private static extern UInt32 CallNtPowerInformation( Int32 InformationLevel, IntPtr lpInputBuffer, UInt32 nInputBufferSize, IntPtr lpOutputBuffer, UInt32 nOutputBufferSize); [DllImport("powrprof.dll", SetLastError = true)] private static extern uint CallNtPowerInformation( int informationLevel, IntPtr lpInputBuffer, uint nInputBufferSize, IntPtr lpOutputBuffer, uint nOutputBufferSize); !!!!VB Signature: <DllImport("powrprof.dll", SetLastError := True)> _ Private Shared Function CallNtPowerInformation(InformationLevel As Int32, lpInputBuffer As IntPtr, nInputBufferSize As UInt32, lpOutputBuffer As IntPtr, nOutputBufferSize As UInt32) As UInt32 End Function !!!!User-Defined Types: None. !!!!Alternative Managed API: Do you know one? Please contribute it! !!!!Notes: '''InformationLevel''' parameter must be one of the [POWER_INFORMATION_LEVEL] enumeration type values. !!!!Tips & Tricks: This is obsolete on Vista. Try GetCurrentPowerPolicies() to get information on both XP and Vista. !!!!Sample Code: IntPtr status = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(SYSTEM_BATTERY_STATE))); uint retval = CallNtPowerInformation( 5, // SystemBatteryState (IntPtr)null, 0, status, (UInt32)Marshal.SizeOf(typeof(SYSTEM_BATTERY_STATE)) ); SYSTEM_BATTERY_STATE batt_status = (SYSTEM_BATTERY_STATE)Marshal.PtrToStructure(status, typeof(SYSTEM_BATTERY_STATE)); !!!!Sample Code: class Program { const int ProcessorInformation = 11; const uint STATUS_SUCCESS = 0; [StructLayout(LayoutKind.Sequential)] struct PROCESSOR_POWER_INFORMATION { public uint Number; public uint MaxMhz; public uint CurrentMhz; public uint MhzLimit; public uint MaxIdleState; public uint CurrentIdleState; } [DllImport("powrprof.dll")] static extern uint CallNtPowerInformation( int InformationLevel, IntPtr lpInputBuffer, int nInputBufferSize, [Out] PROCESSOR_POWER_INFORMATION[] lpOutputBuffer, int nOutputBufferSize ); static void Main(string[] args) { int procCount = Environment.ProcessorCount; PROCESSOR_POWER_INFORMATION[] procInfo = new PROCESSOR_POWER_INFORMATION[procCount]; uint retval = CallNtPowerInformation( ProcessorInformation, IntPtr.Zero, 0, procInfo, procInfo.Length * Marshal.SizeOf(typeof(PROCESSOR_POWER_INFORMATION)) ); if (retval == STATUS_SUCCESS) { foreach (var item in procInfo) { Console.WriteLine(item.CurrentMhz); } } } } Documentation: CallNtPowerInformation@msdn on MSDN
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