防止windows在我的程序运行时进入睡眠状态？

Question

当我的程序正在运行时，我必须阻止windows进入睡眠状态。

我不仅想阻止休眠定时器，我还想取消休眠事件，如果我按下休眠按钮或以任何其他方式主动告诉计算机休眠。因此，SetThreadExecutionState是不够的。

或者...我实际上不必完全阻止睡眠，只需延迟5-10秒就可以让我的程序完成一项任务。

(我知道这是不好的程序行为，但它仅供个人使用。)

Answer 1

我在通过usb连接的硬件设备上遇到了类似的问题。XP /Vista会在中间休眠/休眠...很好，你会说，当它恢复时，它可以继续。如果硬件仍处于连接状态！用户有一种习惯，只要他们想拔出电缆就把它拔出来。

您需要处理XP和Vista

在XP下，捕获WM_POWERBROADCAST并查找PBT_APMQUERYSUSPEND wparam。

   // See if bit 1 is set, this means that you can send a deny while we are busy
   if (message.LParam & 0x1)
   {
      // send the deny message
      return BROADCAST_QUERY_DENY;
   } // if
   else
   {
      return TRUE;
   } // else

在Vista下，像这样使用SetThreadExecutionState

// try this for vista, it will fail on XP
if (SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED | ES_AWAYMODE_REQUIRED) == NULL)
{
   // try XP variant as well just to make sure 
   SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED);
}  // if 

当您的应用程序完成后，将其设置为正常

// set state back to normal
SetThreadExecutionState(ES_CONTINUOUS);

Answer 2

在考虑了vim's answer之后

“使用PowerCreateRequest、PowerSetRequest和PowerClearRequest函数是首选方法。”

由于msdn上的链接AvailabilityRequests.docx很累人(读起来太多了)，我在网上搜索了一个基于PowerCreateRequest的c#的具体示例，发现http://go4answers.webhost4life.com/Example/problem-monitor-wakeup-service-windows7-12092.aspx EDIT 2016 -不再可用

根据我的需要对其进行复制和调整(从msdn复制CloseHandle的PInvoke)：

using System.Runtime.InteropServices;

    #region prevent screensaver, display dimming and automatically sleeping
    POWER_REQUEST_CONTEXT _PowerRequestContext;
    IntPtr _PowerRequest; //HANDLE

    // Availability Request Functions
    [DllImport("kernel32.dll")]
    static extern IntPtr PowerCreateRequest(ref POWER_REQUEST_CONTEXT Context);

    [DllImport("kernel32.dll")]
    static extern bool PowerSetRequest(IntPtr PowerRequestHandle, PowerRequestType RequestType);

    [DllImport("kernel32.dll")]
    static extern bool PowerClearRequest(IntPtr PowerRequestHandle, PowerRequestType RequestType);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true, ExactSpelling = true)]
    internal static extern int CloseHandle(IntPtr hObject);

    // Availablity Request Enumerations and Constants
    enum PowerRequestType
    {
        PowerRequestDisplayRequired = 0,
        PowerRequestSystemRequired,
        PowerRequestAwayModeRequired,
        PowerRequestMaximum
    }

    const int POWER_REQUEST_CONTEXT_VERSION = 0;
    const int POWER_REQUEST_CONTEXT_SIMPLE_STRING = 0x1;
    const int POWER_REQUEST_CONTEXT_DETAILED_STRING = 0x2;

    // Availablity Request Structures
    // Note:  Windows defines the POWER_REQUEST_CONTEXT structure with an
    // internal union of SimpleReasonString and Detailed information.
    // To avoid runtime interop issues, this version of 
    // POWER_REQUEST_CONTEXT only supports SimpleReasonString.  
    // To use the detailed information,
    // define the PowerCreateRequest function with the first 
    // parameter of type POWER_REQUEST_CONTEXT_DETAILED.
    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct POWER_REQUEST_CONTEXT
    {
        public UInt32 Version;
        public UInt32 Flags;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string
            SimpleReasonString;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct PowerRequestContextDetailedInformation
    {
        public IntPtr LocalizedReasonModule;
        public UInt32 LocalizedReasonId;
        public UInt32 ReasonStringCount;
        [MarshalAs(UnmanagedType.LPWStr)]
        public string[] ReasonStrings;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    public struct POWER_REQUEST_CONTEXT_DETAILED
    {
        public UInt32 Version;
        public UInt32 Flags;
        public PowerRequestContextDetailedInformation DetailedInformation;
    }
    #endregion



    /// <summary>
    /// Prevent screensaver, display dimming and power saving. This function wraps PInvokes on Win32 API. 
    /// </summary>
    /// <param name="enableConstantDisplayAndPower">True to get a constant display and power - False to clear the settings</param>
    private void EnableConstantDisplayAndPower(bool enableConstantDisplayAndPower)
    {
        if (enableConstantDisplayAndPower)
        {
            // Set up the diagnostic string
            _PowerRequestContext.Version = POWER_REQUEST_CONTEXT_VERSION;
            _PowerRequestContext.Flags = POWER_REQUEST_CONTEXT_SIMPLE_STRING;
            _PowerRequestContext.SimpleReasonString = "Continuous measurement"; // your reason for changing the power settings;

            // Create the request, get a handle
            _PowerRequest = PowerCreateRequest(ref _PowerRequestContext);

            // Set the request
            PowerSetRequest(_PowerRequest, PowerRequestType.PowerRequestSystemRequired);
            PowerSetRequest(_PowerRequest, PowerRequestType.PowerRequestDisplayRequired);
        }
        else
        {
            // Clear the request
            PowerClearRequest(_PowerRequest, PowerRequestType.PowerRequestSystemRequired);
            PowerClearRequest(_PowerRequest, PowerRequestType.PowerRequestDisplayRequired);

            CloseHandle(_PowerRequest);
        }
    }

Answer 3

使用PowerCreateRequest、PowerSetRequest和PowerClearRequest函数是首选方法。详细信息和示例代码(C/C#)在http://msdn.microsoft.com/en-us/library/windows/hardware/gg463205.aspx中