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PowerRegisterSuspendResumeNotification (powrprof)
 
.
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

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