@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: TODO - a short description !!!!C# Signature: [DllImport("Powrprof.dll", SetLastError = true)] static extern uint PowerRegisterSuspendResumeNotification(uint flags, ref DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS receipient, ref IntPtr registrationHandle); !!!!VB Signature: Declare Function PowerRegisterSuspendResumeNotification Lib "powrprof.dll" (TODO) As TODO !!!!User-Defined Types: None. !!!!Alternative Managed API: Do you know one? Please contribute it! !!!!Notes: private const int WM_POWERBROADCAST = 536; // (0x218) private const int PBT_APMPOWERSTATUSCHANGE = 10; // (0xA) - Power status has changed. private const int PBT_APMRESUMEAUTOMATIC = 18; // (0x12) - Operation is resuming automatically from a low-power state.This message is sent every time the system resumes. private const int PBT_APMRESUMESUSPEND = 7; // (0x7) - Operation is resuming from a low-power state.This message is sent after PBT_APMRESUMEAUTOMATIC if the resume is triggered by user input, such as pressing a key. private const int PBT_APMSUSPEND = 4; // (0x4) - System is suspending operation. private const int PBT_POWERSETTINGCHANGE = 32787; // (0x8013) - A power setting change event has been received. private const int DEVICE_NOTIFY_CALLBACK = 2; /// <summary> /// OS callback delegate definition /// </summary> /// <param name="context">The context for the callback</param> /// <param name="type">The type of the callback...for power notifcation it's a PBT_ message</param> /// <param name="setting">A structure related to the notification, depends on type parameter</param> /// <returns></returns> delegate int DeviceNotifyCallbackRoutine(IntPtr context, int type, IntPtr setting); /// <summary> /// A callback definition /// </summary> [StructLayout(LayoutKind.Sequential)] struct DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS { public DeviceNotifyCallbackRoutine Callback; public IntPtr Context; } !!!!Tips & Tricks: Please add some! !!!!Sample Code: IntPtr registrationHandle = new IntPtr(); DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS recipient = new DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS(); recipient.Callback = new DeviceNotifyCallbackRoutine(DeviceNotifyCallback); recipient.Context = IntPtr.Zero; IntPtr pRecipient = Marshal.AllocHGlobal(Marshal.SizeOf(recipient)); Marshal.StructureToPtr(recipient, pRecipient, false); uint result = PowerRegisterSuspendResumeNotification(DEVICE_NOTIFY_CALLBACK, ref recipient, ref registrationHandle); if (result != 0) Console.WriteLine("Error registering for power notifications: " + Marshal.GetLastWin32Error()); else Console.WriteLine("Successfully Registered for power notifications!"); private static int DeviceNotifyCallback(IntPtr context, int type, IntPtr setting) { Console.WriteLine("Device notify callback called: "); switch(type) { case PBT_APMPOWERSTATUSCHANGE: Console.WriteLine("\tPower status has changed."); break; case PBT_APMRESUMEAUTOMATIC: Console.WriteLine("\tOperation is resuming automatically from a low-power state.This message is sent every time the system resumes."); break; case PBT_APMRESUMESUSPEND: Console.WriteLine("\tOperation is resuming from a low-power state.This message is sent after PBT_APMRESUMEAUTOMATIC if the resume is triggered by user input, such as pressing a key."); break; case PBT_APMSUSPEND: Console.WriteLine("\tSystem is suspending operation."); break; case PBT_POWERSETTINGCHANGE: Console.WriteLine("\tA power setting change event has been received. "); break; default: Console.WriteLine("unknown"); break; } // do something here return 0; } Documentation: PowerRegisterSuspendResumeNotification@msdn on MSDN
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