Qt检测计算机何时进入睡眠？ [英] Qt detect when computer goes into sleep?

问题描述

如何检测用户计算机何时进入睡眠状态（笔记本电脑的盖子关闭，休眠模式由于不活动等）？

How can i detect when a users computer goes into sleep (laptop lid closes, sleep mode due to inactivity, etc)?

我需要这样做才能断开连接用户TCP连接。基本上，我们有一个简单的聊天应用程序，我们想让用户离线。

I need to do this to disconnect the users TCP connection. Basically we got a simple chat application where we want to take the user off-line.

推荐答案

没有Qt方式检测当计算机进入睡眠或休眠时。

There is no Qt way to detect when computer goes to sleep or hibernation. But there are some platform dependent ways to do it.

在Windows上，您可以在WindowProc处理程序中侦听WM_POWERBROADCAST消息：

On Windows you can listen for the WM_POWERBROADCAST message in your WindowProc handler:

LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) {
  if (WM_POWERBROADCAST == message && PBT_APMSUSPEND == wParam) {
    // Going to sleep
  }
}

在linux您可以将以下shell脚本放在/etc/pm/sleep.d中，该脚本使用参数执行程序。您可以通过某种方式启动程序并通知主应用程序：

On linux you can put the following shell script in /etc/pm/sleep.d which executes a program with arguments. You can start a program and notify your main application in some way:

#!/bin/bash
case $1 in
suspend)
    #suspending to RAM
    /Path/to/Program/executable Sleeping
    ;;
resume)
    #resume from suspend
    sleep 3
    /Path/to/Program/executable Woken
    ;;
esac

对于OS X，您可以看到此。

For OS X you can see this.

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