以编程方式确定锁定工作站的持续时间?
Posted
技术标签:
【中文标题】以编程方式确定锁定工作站的持续时间?【英文标题】:Programmatically Determine a Duration of a Locked Workstation? 【发布时间】:2010-09-07 21:10:06 【问题描述】:如何在代码中确定机器锁定多长时间?
也欢迎 C# 之外的其他想法。
我喜欢 Windows 服务理念(并且已经接受它),因为它的简单性和清洁性,但不幸的是,我认为在这种特殊情况下它对我不起作用。我想在我的工作站上运行它而不是在家里(或者除了家之外,我想),但它被国防部非常严格地锁定了。实际上,这也是我自己推出的部分原因。
无论如何我都会写下来看看它是否有效。谢谢大家!
【问题讨论】:
【参考方案1】:我以前没有找到这个,但是你可以从任何应用程序中连接一个 SessionSwitchEventHandler。显然,您的应用程序需要运行,但只要是:
Microsoft.Win32.SystemEvents.SessionSwitch += new Microsoft.Win32.SessionSwitchEventHandler(SystemEvents_SessionSwitch);
void SystemEvents_SessionSwitch(object sender, Microsoft.Win32.SessionSwitchEventArgs e)
if (e.Reason == SessionSwitchReason.SessionLock)
//I left my desk
else if (e.Reason == SessionSwitchReason.SessionUnlock)
//I returned to my desk
【讨论】:
在 Windows 7 x64 和 Windows 10 x64 上测试 100%。 哇,效果惊人!无错误无异常,流畅干净! 这是正确的做法。根据this Microsoft article,“没有可以调用的函数来确定工作站是否被锁定。”必须使用 SessionSwitchEventHandler 对其进行监控。【参考方案2】:我将创建一个处理 OnSessionChange 事件的 Windows 服务(Visual Studio 2005 项目类型),如下所示:
protected override void OnSessionChange(SessionChangeDescription changeDescription)
if (changeDescription.Reason == SessionChangeReason.SessionLock)
//I left my desk
else if (changeDescription.Reason == SessionChangeReason.SessionUnlock)
//I returned to my desk
此时记录活动的内容和方式取决于您,但 Windows 服务可让您快速轻松地访问 Windows 事件,例如启动、关闭、登录/退出,以及锁定和解锁事件。
【讨论】:
【参考方案3】:以下解决方案使用 Win32 API。工作站锁定时调用 OnSessionLock,解锁时调用 OnSessionUnlock。
[DllImport("wtsapi32.dll")]
private static extern bool WTSRegisterSessionNotification(IntPtr hWnd,
int dwFlags);
[DllImport("wtsapi32.dll")]
private static extern bool WTSUnRegisterSessionNotification(IntPtr
hWnd);
private const int NotifyForThisSession = 0; // This session only
private const int SessionChangeMessage = 0x02B1;
private const int SessionLockParam = 0x7;
private const int SessionUnlockParam = 0x8;
protected override void WndProc(ref Message m)
// check for session change notifications
if (m.Msg == SessionChangeMessage)
if (m.WParam.ToInt32() == SessionLockParam)
OnSessionLock(); // Do something when locked
else if (m.WParam.ToInt32() == SessionUnlockParam)
OnSessionUnlock(); // Do something when unlocked
base.WndProc(ref m);
return;
void OnSessionLock()
Debug.WriteLine("Locked...");
void OnSessionUnlock()
Debug.WriteLine("Unlocked...");
private void Form1Load(object sender, EventArgs e)
WTSRegisterSessionNotification(this.Handle, NotifyForThisSession);
// and then when we are done, we should unregister for the notification
// WTSUnRegisterSessionNotification(this.Handle);
【讨论】:
如果您发现 SessionSwitch 事件(来自其他答案)没有触发(例如您的应用程序抑制它),这是一个不错的选择。 对于未来的读者...我~认为~这里的覆盖来自 System.Windows.Forms.Form,因为你可能会写一个这样的类: public class Form1 : System.Windows.Forms .Form 当 SystemEvents.SessionSwitch 不起作用时,这对我有用【参考方案4】:我知道这是一个老问题,但我找到了一种方法来获取给定会话的锁定状态。
我找到了我的答案here,但它是用 C++ 编写的,所以我尽可能多地翻译成 C# 以获得锁定状态。
所以这里是:
static class SessionInfo
private const Int32 FALSE = 0;
private static readonly IntPtr WTS_CURRENT_SERVER = IntPtr.Zero;
private const Int32 WTS_SESSIONSTATE_LOCK = 0;
private const Int32 WTS_SESSIONSTATE_UNLOCK = 1;
private static bool _is_win7 = false;
static SessionInfo()
var os_version = Environment.OSVersion;
_is_win7 = (os_version.Platform == PlatformID.Win32NT && os_version.Version.Major == 6 && os_version.Version.Minor == 1);
[DllImport("wtsapi32.dll")]
private static extern Int32 WTSQuerySessionInformation(
IntPtr hServer,
[MarshalAs(UnmanagedType.U4)] UInt32 SessionId,
[MarshalAs(UnmanagedType.U4)] WTS_INFO_CLASS WTSInfoClass,
out IntPtr ppBuffer,
[MarshalAs(UnmanagedType.U4)] out UInt32 pBytesReturned
);
[DllImport("wtsapi32.dll")]
private static extern void WTSFreeMemoryEx(
WTS_TYPE_CLASS WTSTypeClass,
IntPtr pMemory,
UInt32 NumberOfEntries
);
private enum WTS_INFO_CLASS
WTSInitialProgram = 0,
WTSApplicationName = 1,
WTSWorkingDirectory = 2,
WTSOEMId = 3,
WTSSessionId = 4,
WTSUserName = 5,
WTSWinStationName = 6,
WTSDomainName = 7,
WTSConnectState = 8,
WTSClientBuildNumber = 9,
WTSClientName = 10,
WTSClientDirectory = 11,
WTSClientProductId = 12,
WTSClientHardwareId = 13,
WTSClientAddress = 14,
WTSClientDisplay = 15,
WTSClientProtocolType = 16,
WTSIdleTime = 17,
WTSLogonTime = 18,
WTSIncomingBytes = 19,
WTSOutgoingBytes = 20,
WTSIncomingFrames = 21,
WTSOutgoingFrames = 22,
WTSClientInfo = 23,
WTSSessionInfo = 24,
WTSSessionInfoEx = 25,
WTSConfigInfo = 26,
WTSValidationInfo = 27,
WTSSessionAddressV4 = 28,
WTSIsRemoteSession = 29
private enum WTS_TYPE_CLASS
WTSTypeProcessInfoLevel0,
WTSTypeProcessInfoLevel1,
WTSTypeSessionInfoLevel1
public enum WTS_CONNECTSTATE_CLASS
WTSActive,
WTSConnected,
WTSConnectQuery,
WTSShadow,
WTSDisconnected,
WTSIdle,
WTSListen,
WTSReset,
WTSDown,
WTSInit
public enum LockState
Unknown,
Locked,
Unlocked
[StructLayout(LayoutKind.Sequential)]
private struct WTSINFOEX
public UInt32 Level;
public UInt32 Reserved; /* I have observed the Data field is pushed down by 4 bytes so i have added this field as padding. */
public WTSINFOEX_LEVEL Data;
[StructLayout(LayoutKind.Sequential)]
private struct WTSINFOEX_LEVEL
public WTSINFOEX_LEVEL1 WTSInfoExLevel1;
[StructLayout(LayoutKind.Sequential)]
private struct WTSINFOEX_LEVEL1
public UInt32 SessionId;
public WTS_CONNECTSTATE_CLASS SessionState;
public Int32 SessionFlags;
/* I can't figure out what the rest of the struct should look like but as i don't need anything past the SessionFlags i'm not going to. */
public static LockState GetSessionLockState(UInt32 session_id)
IntPtr ppBuffer;
UInt32 pBytesReturned;
Int32 result = WTSQuerySessionInformation(
WTS_CURRENT_SERVER,
session_id,
WTS_INFO_CLASS.WTSSessionInfoEx,
out ppBuffer,
out pBytesReturned
);
if (result == FALSE)
return LockState.Unknown;
var session_info_ex = Marshal.PtrToStructure<WTSINFOEX>(ppBuffer);
if (session_info_ex.Level != 1)
return LockState.Unknown;
var lock_state = session_info_ex.Data.WTSInfoExLevel1.SessionFlags;
WTSFreeMemoryEx(WTS_TYPE_CLASS.WTSTypeSessionInfoLevel1, ppBuffer, pBytesReturned);
if (_is_win7)
/* Ref: https://msdn.microsoft.com/en-us/library/windows/desktop/ee621019(v=vs.85).aspx
* Windows Server 2008 R2 and Windows 7: Due to a code defect, the usage of the WTS_SESSIONSTATE_LOCK
* and WTS_SESSIONSTATE_UNLOCK flags is reversed. That is, WTS_SESSIONSTATE_LOCK indicates that the
* session is unlocked, and WTS_SESSIONSTATE_UNLOCK indicates the session is locked.
* */
switch (lock_state)
case WTS_SESSIONSTATE_LOCK:
return LockState.Unlocked;
case WTS_SESSIONSTATE_UNLOCK:
return LockState.Locked;
default:
return LockState.Unknown;
else
switch (lock_state)
case WTS_SESSIONSTATE_LOCK:
return LockState.Locked;
case WTS_SESSIONSTATE_UNLOCK:
return LockState.Unlocked;
default:
return LockState.Unknown;
注意:上面的代码是从一个更大的项目中提取的,所以如果我错过了一点抱歉。我没有时间测试上面的代码,但计划在一两周后回来检查所有内容。我现在才发布它,因为我不想忘记这样做。
【讨论】:
这可行(到目前为止已测试 Windows 7)。谢谢,过去几周我们一直在寻找这个问题,而您的答案来得正是时候! 代码有几个错误: 1.if (session_info_ex.Level != 1)
- 如果条件为真,内存不会被释放。 2. 如果 session_info_ex.Level != 1 你不应该这样做:Marshal.PtrToStructure<WTSINFOEX>(ppBuffer);
因为返回缓冲区的大小可能与 WTSINFOEX 的大小不同
(续) 3. 不必添加字段UInt32 Reserved;
,而是应完全定义结构WTSINFOEX_LEVEL1
。在这种情况下,编译器将对结构内的字段进行正确的填充(对齐)。 4.函数WTSFreeMemoryEx
在这里被误用。 WTSFreeMemory
必须改为使用。 WTSFreeMemoryEx
用于在WTSEnumerateSessionsEx
之后释放内存。
(countinued) 5. CharSet = CharSet.Auto
必须在所有属性中使用。【参考方案5】:
如果您有兴趣编写一个 windows 服务来“查找”这些事件,topshelf(使编写 windows 服务更容易的库/框架)有一个钩子。
public interface IMyServiceContract
void Start();
void Stop();
void SessionChanged(Topshelf.SessionChangedArguments args);
public class MyService : IMyServiceContract
public void Start()
public void Stop()
public void SessionChanged(SessionChangedArguments e)
Console.WriteLine(e.ReasonCode);
现在是把 topshelf 服务连接到上面的接口/具体的代码
下面的一切都是“典型的”topshelf setup....除了我标记为的 2 行
/* 这是魔法线 */
这些是触发 SessionChanged 方法的原因。
我在 Windows 10 x64 上对此进行了测试。我锁定并解锁了我的机器,我得到了想要的结果。
IMyServiceContract myServiceObject = new MyService(); /* container.Resolve<IMyServiceContract>(); */
HostFactory.Run(x =>
x.Service<IMyServiceContract>(s =>
s.ConstructUsing(name => myServiceObject);
s.WhenStarted(sw => sw.Start());
s.WhenStopped(sw => sw.Stop());
s.WhenSessionChanged((csm, hc, chg) => csm.SessionChanged(chg)); /* THIS IS MAGIC LINE */
);
x.EnableSessionChanged(); /* THIS IS MAGIC LINE */
/* use command line variables for the below commented out properties */
/*
x.RunAsLocalService();
x.SetDescription("My Description");
x.SetDisplayName("My Display Name");
x.SetServiceName("My Service Name");
x.SetInstanceName("My Instance");
*/
x.StartManually(); // Start the service manually. This allows the identity to be tweaked before the service actually starts
/* the below map to the "Recover" tab on the properties of the Windows Service in Control Panel */
x.EnableServiceRecovery(r =>
r.OnCrashOnly();
r.RestartService(1); ////first
r.RestartService(1); ////second
r.RestartService(1); ////subsequents
r.SetResetPeriod(0);
);
x.DependsOnEventLog(); // Windows Event Log
x.UseLog4Net();
x.EnableShutdown();
x.OnException(ex =>
/* Log the exception */
/* not seen, I have a log4net logger here */
);
);
我的 packages.config 提供有关版本的提示:
<package id="log4net" version="2.0.5" targetFramework="net45" />
<package id="Topshelf" version="4.0.3" targetFramework="net461" />
<package id="Topshelf.Log4Net" version="4.0.3" targetFramework="net461" />
【讨论】:
或者如果你已经实现了ServiceControl
并且不隐式创建服务类实例,则可以将x.EnableSessionChanged();
与ServiceSessionChange
接口实现结合使用。喜欢x.Service<ServiceImpl>();
。您必须在ServiceImpl
类中实现ServiceSessionChange
:class ServiceImpl : ServiceControl, ServiceSessionChange
【参考方案6】:
注意:这不是答案,而是对Timothy Carter 答案的(贡献),因为到目前为止我的声誉不允许我发表评论。
以防万一有人尝试了 Timothy Carter 回答中的代码,但没有立即在 Windows 服务中运行,则需要在服务的构造函数中将一个属性设置为 true
。
只需在构造函数中添加一行:
CanHandleSessionChangeEvent = true;
并且一定不要在服务启动后设置该属性,否则会抛出InvalidOperationException
。
【讨论】:
【参考方案7】:在 Windows 任务计划程序中,您可以创建触发 on workstation lock
和 on workstation unlock
的任务。每个任务都可以将标志和时间戳写入文件,以说明工作站是否被锁定或解锁以及何时发生。
我意识到这不是一种编程方式。它比编写服务更简单。它不会错过任何事件,因为您的程序恰好在锁定/解锁转换时没有运行。
【讨论】:
【参考方案8】:下面是 100% 工作代码,用于查找 PC 是否被锁定。
在使用之前使用命名空间System.Runtime.InteropServices
。
[DllImport("user32", EntryPoint = "OpenDesktopA", CharSet = CharSet.Ansi,SetLastError = true, ExactSpelling = true)]
private static extern Int32 OpenDesktop(string lpszDesktop, Int32 dwFlags, bool fInherit, Int32 dwDesiredAccess);
[DllImport("user32", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
private static extern Int32 CloseDesktop(Int32 hDesktop);
[DllImport("user32", CharSet = CharSet.Ansi,SetLastError = true,ExactSpelling = true)]
private static extern Int32 SwitchDesktop(Int32 hDesktop);
public static bool IsWorkstationLocked()
const int DESKTOP_SWITCHDESKTOP = 256;
int hwnd = -1;
int rtn = -1;
hwnd = OpenDesktop("Default", 0, false, DESKTOP_SWITCHDESKTOP);
if (hwnd != 0)
rtn = SwitchDesktop(hwnd);
if (rtn == 0)
// Locked
CloseDesktop(hwnd);
return true;
else
// Not locked
CloseDesktop(hwnd);
else
// Error: "Could not access the desktop..."
return false;
【讨论】:
检查 MSDN 以获取 OpenInputDesktop 和 GetUserObjectInformation,以获取活动桌面名称。对于使用 Microsoft 的 desktops.exe 实用程序或其他方式在多个桌面中工作的用户,上述代码并不安全/好用。或者更好的是,只需尝试在活动桌面 (SetThreadDesktop) 上创建一个窗口,如果可行,请在其上显示您的 UI。如果不是,那么它是一个受保护/特殊的桌面,所以不要。以上是关于以编程方式确定锁定工作站的持续时间?的主要内容,如果未能解决你的问题,请参考以下文章