如何确定当前 Windows 会话是否被锁定？
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How to determine if the current Windows session is locked or not?
提问by Martin
I have an application which runs every hour on a Windows XP Machine. To run properly, this application requires the current session to be unlocked. So I was wondering if there a way to know if the current Windows session is locked or not with C# and .NET 3.5.
我有一个应用程序，它在 Windows XP 机器上每小时运行一次。要正常运行，此应用程序需要解锁当前会话。所以我想知道是否有办法知道当前的 Windows 会话是否被 C# 和 .NET 3.5 锁定。
UPDATE: The application cannot listen to the SessionNotification events. The application can be kicked off anytime and terminates when completed.
更新：应用程序无法侦听 SessionNotification 事件。该应用程序可以随时启动并在完成后终止。
Thanks!
谢谢！
回答by Dan F
These are untested by me, but look interesting. I'd give them a test, but my Visual Studio appears to be less than happy with me at the moment.
这些未经我测试，但看起来很有趣。我会给他们一个测试，但目前我的 Visual Studio 似乎对我不太满意。
Is there any way a program can know whether or not the computer is locked?(google cache link, thanks @hometoast)(link permanently dead)- Lots of information in this thread
- If your app can run all the time and "wake up" once an hour, the SystemEvents.SessionSwitchevent might help you out, there's an example in the thread above
有什么办法可以让程序知道计算机是否被锁定？（谷歌缓存链接，感谢@hometoast）（链接永久失效）- 这个线程中有很多信息
- 如果您的应用程序可以一直运行并且每小时“唤醒”一次，SystemEvents.SessionSwitch事件可能会帮助您，上面的线程中有一个示例
回答by Greg Hewgill
I once used the GetForegroundWindow()function to determine whether a screen saver was running. If the return value was NULL, then the screen saver (or, presumably, a locked workstation) was active. Note that this was in the early days of Windows NT, is not documented to do this, and there's no guarantee that it will still do the same thing today.
我曾经使用该GetForegroundWindow()功能来确定屏幕保护程序是否正在运行。如果返回值为NULL，则屏幕保护程序（或者，可能是锁定的工作站）处于活动状态。请注意，这是在 Windows NT 的早期，没有记录可以这样做，并且不能保证它今天仍然会做同样的事情。
Looking at the Win32 API reference, you may be able to use something like OpenInputDesktop()to get the HDESKof the currently active desktop. If you can't get a handle to the desktop or if it's different from your thread desktop, then your app is running in a desktop that is not active (and the workstation is probably either in a screensaver state or is locked). No guarantees that this method will work, but it might be worth investigating.
查看 Win32 API 参考，您可以使用类似的方法OpenInputDesktop()来获取HDESK当前活动桌面的 。如果您无法获得桌面的句柄，或者它与您的线程桌面不同，那么您的应用程序正在非活动的桌面上运行（并且工作站可能处于屏幕保护程序状态或被锁定）。不能保证此方法会起作用，但可能值得研究。
