我的程序运行时防止窗口进入睡眠状态？

Question

我的程序运行时,我必须阻止窗口进入睡眠状态.

而且我不仅想要阻止睡眠定时器,我还想取消睡眠事件,如果我按下睡眠按钮或以任何其他方式主动告诉计算机睡眠.因此SetThreadExecutionState是不够的.

或者......我实际上不必完全阻止睡眠,只需要将其延迟5-10秒以允许我的程序完成任务.

(我知道这是一个糟糕的程序行为,但它仅供个人使用.)

Answer 1

我有一个这样的问题,通过USB连接硬件设备.XP/Vista会在中间睡觉/休眠...很棒你说,当它恢复时它可以继续.如果硬件仍然连接!!! 用户有习惯在他们感觉到的时候拉出电缆.

你需要处理XP和Vista

在XP下陷阱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下使用像这样的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 

当你的应用程序完成后,将其恢复正常

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

Answer 2

在考虑了vim的答案之后

"使用PowerCreateRequest,PowerSetRequest和PowerClearRequest函数是首选方法."

使用msdn上的链接的AvailabilityRequests.docx,这很费劲(很难阅读),我在网上搜索了一个基于PowerCreateRequest的c#的具体例子,发现了http://go4answers.webhost4life.com /Example/problem-monitor-wakeup-service-windows7-12092.aspx [编辑2016 - 不再可用]

根据我的需要复制并调整它(从msdn复制的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#)位于http://msdn.microsoft.com/en-us/library/windows/hardware/gg463205.aspx内