blocks|key|1190841|text|用户不能看到你的通知有很多原因，比如全屏视频播放，或者用户不在那里。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1190842|我建议您可以通过监视键盘和鼠标来完成，而不是检查通知是否可以显示检查用户是否在那里。|1190843|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

There are many reason why the user can't see your notifications also for example full screen video playback or that the user is just not there. 

I suggest that instead of checking if the notification can be displayed check if the user is there, you can do that by monitoring the keyboard and mouse.

blocks|key|1938284|text|使用SystemParametersInfo检测屏幕保护程序是否正在运行-调用类型为SPI_GETSCREENSAVERRUNNING。这在Win2000及更高版本上受支持。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1938285|在StackOverflow+here上有来自@dan_g的代码来检查wksta是否被锁定。|1938286|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/ms724947(VS.85).aspx|1|https://stackoverflow.com/questions/44980/how-can-i-programmatically-determine-if-my-workstation-is-locked^0|2|K|0|0|F|4|1|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

Use <a href="http://msdn.microsoft.com/en-us/library/ms724947(VS.85).aspx" rel="nofollow noreferrer">SystemParametersInfo</a> to detect whether screen saver is running - the calltype is SPI_GETSCREENSAVERRUNNING. This is supported on Win2000 and above.

There is code from @dan_g on StackOverflow <a href="https://stackoverflow.com/questions/44980/how-can-i-programmatically-determine-if-my-workstation-is-locked">here</a> to check if wksta is locked.

blocks|key|1188524|text|没有记录在案的方法来确定工作站当前是否已锁定。但是，当它解锁时，您可以收到通知。订阅SystemEvents.SessionSwitch事件，您将获得SessionSwitchReason.SessionLock和解锁。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1188525|侦察救星也很麻烦。当屏幕保护程序打开时，您的主窗口将收到WM_SYSCOMMAND消息SC_SCREENSAVE。您可以调用SystemParametersInfo来检查它是否正在运行。您可以在我的this+thread答案中找到此问题的示例代码。|offset|length|1188526|没有好的方法来找出用户是否睡着了。|1188527|entityMap|0|LINK|mutability|MUTABLE|url|http://social.msdn.microsoft.com/forums/en-US/netfxbcl/thread/4cdb1251-da4b-4693-a58f-841c64c8f8bc/^0|0|2R|B|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

There is no documented way to find out if the workstation is currently locked. You can however get a notification when it un/locks. Subscribe the SystemEvents.SessionSwitch event, you'll get SessionSwitchReason.SessionLock and Unlock.

The sceen saver is troublesome too. Your main window gets the WM_SYSCOMMAND message, SC_SCREENSAVE when the screen saver turns on. You can pinvoke SystemParametersInfo to check if it running. You'll find sample code for this in my answer in <a href="http://social.msdn.microsoft.com/forums/en-US/netfxbcl/thread/4cdb1251-da4b-4693-a58f-841c64c8f8bc/" rel="noreferrer">this thread</a>.

There is no good way to find out if the user fell asleep.

blocks|key|1190883|text|我最近在previous+blog+post上再次检查了这段代码，以确保它可以在Windows+XP到7、x86和x64的版本上运行，并对其进行了一些清理。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1190884|以下是检查工作站是否锁定以及屏幕保护程序是否正在运行的最新极简主义代码，其中包含两个易于使用的静态方法：|1190885|using+System;
using+System.Runtime.InteropServices;

namespace+BrutalDev.Helpers
{
++public+static+class+NativeMethods
++{
++++//+Used+to+check+if+the+screen+saver+is+running
++++[DllImport("user32.dll",+CharSet+=+CharSet.Auto)]
++++[return:+MarshalAs(UnmanagedType.Bool)]
++++public+static+extern+bool+SystemParametersInfo(uint+uAction,+
+++++++++++++++++++++++++++++++++++++++++++++++++++uint+uParam,+
+++++++++++++++++++++++++++++++++++++++++++++++++++ref+bool+lpvParam,
+++++++++++++++++++++++++++++++++++++++++++++++++++int+fWinIni);

++++//+Used+to+check+if+the+workstation+is+locked
++++[DllImport("user32",+SetLastError+=+true)]
++++private+static+extern+IntPtr+OpenDesktop(string+lpszDesktop,
+++++++++++++++++++++++++++++++++++++++++++++uint+dwFlags,
+++++++++++++++++++++++++++++++++++++++++++++bool+fInherit,
+++++++++++++++++++++++++++++++++++++++++++++uint+dwDesiredAccess);

++++[DllImport("user32",+SetLastError+=+true)]
++++private+static+extern+IntPtr+OpenInputDesktop(uint+dwFlags,
++++++++++++++++++++++++++++++++++++++++++++++++++bool+fInherit,
++++++++++++++++++++++++++++++++++++++++++++++++++uint+dwDesiredAccess);

++++[DllImport("user32",+SetLastError+=+true)]
++++private+static+extern+IntPtr+CloseDesktop(IntPtr+hDesktop);

++++[DllImport("user32",+SetLastError+=+true)]
++++[return:+MarshalAs(UnmanagedType.Bool)]
++++private+static+extern+bool+SwitchDesktop(IntPtr+hDesktop);

++++//+Check+if+the+workstation+has+been+locked.
++++public+static+bool+IsWorkstationLocked()
++++{
++++++const+int+DESKTOP_SWITCHDESKTOP+=+256;
++++++IntPtr+hwnd+=+OpenInputDesktop(0,+false,+DESKTOP_SWITCHDESKTOP);

++++++if+(hwnd+==+IntPtr.Zero)
++++++{
++++++++//+Could+not+get+the+input+desktop,+might+be+locked+already?
++++++++hwnd+=+OpenDesktop("Default",+0,+false,+DESKTOP_SWITCHDESKTOP);
++++++}

++++++//+Can+we+switch+the+desktop?
++++++if+(hwnd+!=+IntPtr.Zero)
++++++{
++++++++if+(SwitchDesktop(hwnd))
++++++++{
++++++++++//+Workstation+is+NOT+LOCKED.
++++++++++CloseDesktop(hwnd);
++++++++}
++++++++else
++++++++{
++++++++++CloseDesktop(hwnd);
++++++++++//+Workstation+is+LOCKED.
++++++++++return+true;
++++++++}
++++++}

++++++return+false;
++++}

++++//+Check+if+the+screensaver+is+busy+running.
++++public+static+bool+IsScreensaverRunning()
++++{
++++++const+int+SPI_GETSCREENSAVERRUNNING+=+114;
++++++bool+isRunning+=+false;

++++++if+(!SystemParametersInfo(SPI_GETSCREENSAVERRUNNING,+0,+ref+isRunning,+0))
++++++{
++++++++//+Could+not+detect+screen+saver+status...
++++++++return+false;
++++++}

++++++if+(isRunning)
++++++{
++++++++//+Screen+saver+is+ON.
++++++++return+true;
++++++}

++++++//+Screen+saver+is+OFF.
++++++return+false;
++++}
++}
}|code-block|syntax|javascript|1190886|UPDATE：根据评论中的建议更新代码。|style|BOLD|1190887|当工作站被锁定时，OpenInputDesktop方法不会返回句柄，因此我们可以依靠OpenDesktop来获取句柄，以确保通过尝试切换来锁定它。如果它没有被锁定，那么你的默认桌面将不会被激活，因为OpenInputDesktop将为你正在查看的桌面返回一个有效的句柄。|1190888|entityMap|0|LINK|mutability|MUTABLE|url|http://brutaldev.com/post/2008/05/23/Checking-if-the-workstation-is-locked.aspx^0|4|I|0|0|0|0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|14|8|@$A|15|B|16|M|N]]|9|@]|C|$]]|$1|O|3|P|5|6|7|17|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|18|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

I have recently checked this code again from a <a href="http://brutaldev.com/post/2008/05/23/Checking-if-the-workstation-is-locked.aspx">previous blog post</a> to ensure it works on versions of Windows XP to 7, x86 and x64 and cleaned it up a bit.

Here is the latest minimalist code that checks if the workstation is locked and if the screensaver is running wrapped in two easy to use static methods:

<pre><code>using System;
using System.Runtime.InteropServices;

namespace BrutalDev.Helpers
{
 public static class NativeMethods
 {
 // Used to check if the screen saver is running
 [DllImport("user32.dll", CharSet = CharSet.Auto)]
 [return: MarshalAs(UnmanagedType.Bool)]
 public static extern bool SystemParametersInfo(uint uAction, 
 uint uParam, 
 ref bool lpvParam,
 int fWinIni);

 // Used to check if the workstation is locked
 [DllImport("user32", SetLastError = true)]
 private static extern IntPtr OpenDesktop(string lpszDesktop,
 uint dwFlags,
 bool fInherit,
 uint dwDesiredAccess);

 [DllImport("user32", SetLastError = true)]
 private static extern IntPtr OpenInputDesktop(uint dwFlags,
 bool fInherit,
 uint dwDesiredAccess);

 [DllImport("user32", SetLastError = true)]
 private static extern IntPtr CloseDesktop(IntPtr hDesktop);

 [DllImport("user32", SetLastError = true)]
 [return: MarshalAs(UnmanagedType.Bool)]
 private static extern bool SwitchDesktop(IntPtr hDesktop);

 // Check if the workstation has been locked.
 public static bool IsWorkstationLocked()
 {
 const int DESKTOP_SWITCHDESKTOP = 256;
 IntPtr hwnd = OpenInputDesktop(0, false, DESKTOP_SWITCHDESKTOP);

 if (hwnd == IntPtr.Zero)
 {
 // Could not get the input desktop, might be locked already?
 hwnd = OpenDesktop("Default", 0, false, DESKTOP_SWITCHDESKTOP);
 }

 // Can we switch the desktop?
 if (hwnd != IntPtr.Zero)
 {
 if (SwitchDesktop(hwnd))
 {
 // Workstation is NOT LOCKED.
 CloseDesktop(hwnd);
 }
 else
 {
 CloseDesktop(hwnd);
 // Workstation is LOCKED.
 return true;
 }
 }

 return false;
 }

 // Check if the screensaver is busy running.
 public static bool IsScreensaverRunning()
 {
 const int SPI_GETSCREENSAVERRUNNING = 114;
 bool isRunning = false;

 if (!SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, ref isRunning, 0))
 {
 // Could not detect screen saver status...
 return false;
 }

 if (isRunning)
 {
 // Screen saver is ON.
 return true;
 }

 // Screen saver is OFF.
 return false;
 }
 }
}
</code></pre>

UPDATE: Code updated based on suggestions in the comments.

When the workstation is locked then the OpenInputDesktop method does not return a handle so we can fall-back on OpenDesktop for a handle to make sure it's locked by trying to switch. If it's not locked then your default desktop will not be activated since OpenInputDesktop will return a valid handle for the desktop you are viewing.

blocks|key|1188553|text|SystemEvents.SessionSwitch+%2B=+new+SessionSwitchEventHandler((sender,+e)+=>
++++++++{
++++++++++++switch+(e.Reason)
++++++++++++{
++++++++++++++++//If+Reason+is+Lock,+Turn+off+the+monitor.
++++++++++++++++case+SessionSwitchReason.SessionLock:
++++++++++++++++++++//SendMessage(HWND_BROADCAST,+WM_SYSCOMMAND,+SC_MONITORPOWER,+MONITOR_OFF);
++++++++++++++++++++MessageBox.Show("locked");
++++++++++++++++++++break;

++++++++++++++++case+SessionSwitchReason.SessionUnlock:
++++++++++++++++++++MessageBox.Show("unlocked");
++++++++++++++++++++break;
++++++++++++}
++++++++});|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1188554|这将指示会话何时锁定和解锁。|unstyled|1188555|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>SystemEvents.SessionSwitch += new SessionSwitchEventHandler((sender, e) =&gt;
 {
 switch (e.Reason)
 {
 //If Reason is Lock, Turn off the monitor.
 case SessionSwitchReason.SessionLock:
 //SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, MONITOR_OFF);
 MessageBox.Show("locked");
 break;

 case SessionSwitchReason.SessionUnlock:
 MessageBox.Show("unlocked");
 break;
 }
 });
</code></pre>

This will indicate when the session is Locked and Unlocked.

blocks|key|1188569|text|在研究这个问题时，我发现了一些支持检测工作站是否被锁定的技术。其中一个非常简单：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1188570|bool+locked+=+Process.GetProcessesByName("logonui").Any();|code-block|syntax|javascript|1188571|这是因为logonui进程仅在桌面锁定时运行。|1188572|另一种更复杂的方法是向后遍历系统事件日志，查找事件ids+4800和4801。这些指示机器何时被锁定和解锁。|1188573|有关更多详细信息，请访问：|1188574|https://superuser.com/questions/1170918/determine-remote-windows-screen-locked-or-unlocked-remotely|offset|length|1188575|http://mctexpert.blogspot.com/2012/10/how-to-determine-if-client-on-your.html|1188576|后者需要设置审计策略，这些策略无论如何都是默认的。我在一家企业IT组织工作，所以这对我来说并不是问题，因为我确信这些设置已经应用。|1188577|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|0|0|0|2R|0|0|0|25|1|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|13|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|14|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|17|8|@]|9|@$O|18|P|19|1|1A]]|A|$]]|$1|Q|3|R|5|6|7|1B|8|@]|9|@$O|1C|P|1D|1|1E]]|A|$]]|$1|S|3|T|5|6|7|1F|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|N]]|11|$5|X|Y|Z|A|$10|R]]]]

In researching this question I found a couple techniques that support detecting if the workstation is locked. One is really simple:

<pre><code>bool locked = Process.GetProcessesByName("logonui").Any();
</code></pre>

This works because the logonui process is only running when the desktop is locked.

Another more complicated approach is to walk the system event log backwards looking for event ids 4800 and 4801. These indicate when a machine is locked and unclocked.

More detail can be found at:

<a href="https://superuser.com/questions/1170918/determine-remote-windows-screen-locked-or-unlocked-remotely">https://superuser.com/questions/1170918/determine-remote-windows-screen-locked-or-unlocked-remotely</a>

<a href="http://mctexpert.blogspot.com/2012/10/how-to-determine-if-client-on-your.html" rel="nofollow noreferrer">http://mctexpert.blogspot.com/2012/10/how-to-determine-if-client-on-your.html</a>

The latter requires audit policies to be set which are the default anyways. I work in an enterprise IT organization so it's not a concern for me as I'm certain those settings are applied.

I'm writing an app that at times will send notifications to the user in the form of <a href="http://blog.fatbusinessman.com/blog-post-images/msn-pics-in-popups.png" rel="noreferrer">toaster messages</a>.

If the user is not there, he can't see the notification. So what I wanna do is be able to check if the user has locked the screen or if the screensaver happens to be activated.

Any notification that is triggered while the user cannot see it will be delayed and shown when the user logs back in and resumes his session.

I'm on Windows 7 myself, but I'd prefer a solution that works universally for Windows XP and up.

Detecting if the screensaver is active and/or the user has locked the screen in Windows

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在写一个应用程序，它有时会以的形式发送通知给用户。如果用户不在那里，他就看不到通知。所以我想要做的是能够检查用户是否锁定了屏幕，或者屏幕保护程序是否恰好被激活。在用户无法看到时触发的任何通知都将被延迟，并在用户重新登录并恢复其会话时显示。我自己使用的是Windows7，但我更喜欢适用于Windows XP及更高版本...

问正在检测Windows中的屏幕保护程序是否处于活动状态和/或用户是否已锁定屏幕
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问正在检测Windows中的屏幕保护程序是否处于活动状态和/或用户是否已锁定屏幕EN