经过近三周的研究，终于实现了windows桌面锁定后的自动登录。可以说实现这个功能还是挺复杂的，用到的主要技术包括windows服务启动程序，桌面的自动化技术、还有管道通信等等

代码主要用到三个模块，windows服务启动程序模块，自动登录程序模块，和主程序模块，主程序模块用于监视windows桌面的锁定状态，然后通过管道通信通知windows服务去启动自动登录程序，自动登录程序获取到windows登录desktop对象，然后利用uiautomation技术实现自动登录

这里面为什么要用windows服务去启动登录程序？主程序不直接启动登录程序？因为使用windows服务去启动进程，进程可以获取到system权限，system是最大的权限，进程只有获取到system权限才可以获取windows登录桌面对象。

现在贴上部分核心代码仅供参考

windows服务

   protected override void OnStart(string[] args){thread = new Thread(() =>{string currentUserName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;while (true){using (NamedPipeServerStream pipeServer = new NamedPipeServerStream("autologonpipe", PipeDirection.InOut)){pipeServer.WaitForConnection();//等待连接，程序会阻塞在此处，直到有一个连接到达try{using (StreamReader sr = new StreamReader(pipeServer)){var codeExec = sr.ReadLine();Helper.RespawnInActiveTerminalSession(codeExec);}}catch (Exception ex){using (StreamWriter writer = new StreamWriter(logTxt, true)){writer.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss ") + ex.Message);}}}}});thread.IsBackground = true;thread.Start();}

windows服务将通过管道监听命令，收到命令后启动自动登录程序。

 public static void RespawnInActiveTerminalSession(string exepath){IntPtr token = IntPtr.Zero;IntPtr newToken = IntPtr.Zero;try{UInt32 sessionId = GetActiveTerminalSessionId();if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ALL_ACCESS, out token)){throw new WinApiException("OpenProcessToken");}if (!DuplicateTokenEx(token, MAXIMUM_ALLOWED, IntPtr.Zero, SECURITY_IMPERSONATION_LEVEL.SecurityIdentification, TOKEN_TYPE.TokenPrimary, out newToken)){throw new WinApiException("DuplicateTokenEx");}if (!SetTokenInformation(newToken, TOKEN_INFORMATION_CLASS.TokenSessionId, ref sessionId, (UInt32)Marshal.SizeOf(sessionId))){throw new WinApiException("SetTokenInformation");}STARTUPINFO startupInfo = new STARTUPINFO();startupInfo.cb = Marshal.SizeOf(startupInfo);startupInfo.dwFlags = STARTF_USESHOWWINDOW;startupInfo.wShowWindow = SW_SHOW;PROCESS_INFORMATION processInformation;if (!CreateProcessAsUser(newToken,exepath??System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName,IntPtr.Zero,IntPtr.Zero,IntPtr.Zero,false,0,IntPtr.Zero,IntPtr.Zero,ref startupInfo,out processInformation)){throw new WinApiException("CreateProcessAsUser");}}finally{if (token != IntPtr.Zero){CloseHandle(token);}if (newToken != IntPtr.Zero){CloseHandle(newToken);}}}

ui自动化 实现自动登录

    AutomationElement rootElement = AutomationElement.RootElement;AutomationElementCollection subChildren = rootElement.FindAll(System.Windows.Automation.TreeScope.Subtree, System.Windows.Automation.Condition.TrueCondition);foreach (AutomationElement element in subChildren){using (StreamWriter writer = new StreamWriter(logTxt, true)){writer.WriteLine(element.Current.Name + " " + element.Current.LocalizedControlType);}if (element.Current.IsPassword){object parttern;if (element.TryGetCurrentPattern(ValuePattern.Pattern, out parttern)){ValuePattern valuePattern = parttern as ValuePattern;valuePattern.SetValue("123456");using (StreamWriter writer = new StreamWriter(logTxt, true)){writer.WriteLine("set password");}}}if (!string.IsNullOrEmpty(element.Current.Name) && element.Current.Name.Contains("提交")){if (element.TryGetCurrentPattern(InvokePattern.Pattern, out object pattern)){try{InvokePattern invokePattern = pattern as InvokePattern;invokePattern.Invoke();using (StreamWriter writer = new StreamWriter(logTxt, true)){writer.WriteLine("执行操作 登录 提交");}}catch (Exception exp){}}break;}if (!string.IsNullOrEmpty(element.Current.Name) && element.Current.Name.Contains("确定")){if (element.TryGetCurrentPattern(InvokePattern.Pattern, out object pattern)){try{InvokePattern invokePattern = pattern as InvokePattern;invokePattern.Invoke();using (StreamWriter writer = new StreamWriter(logTxt, true)){writer.WriteLine("登录 提交");}}catch (Exception exp){}}break;}}