CreateProcessasuser - AccessViolationError 错误

Question

我正在尝试使用 createProcessasUser 从 Windows 服务（LocalSystem）启动 Gui 托盘应用程序 - 就像这样：

    public static System.Diagnostics.Process StartProcessInSession(int sessionID, String commandLine)
    {
        IntPtr userToken;
        if (WTSQueryUserToken(sessionID, out userToken))
        {
            //note that WTSQueryUserToken only works when in context of local system account with SE_TCB_NAME
            IntPtr lpEnvironment;
            if (CreateEnvironmentBlock(out lpEnvironment, userToken, false))
            {
                StartupInfo si = new StartupInfo();
                si.cb = Marshal.SizeOf(si);
                si.lpDesktop = "winsta0\\default";
                si.dwFlags = STARTF.STARTF_USESHOWWINDOW;
                si.wShowWindow = ShowWindow.SW_SHOW;
                ProcessInformation pi;
                if (CreateProcessAsUser(userToken, null, new StringBuilder(commandLine), IntPtr.Zero, IntPtr.Zero, false, CreationFlags.CREATE_NEW_CONSOLE | CreationFlags.CREATE_UNICODE_ENVIRONMENT, lpEnvironment, null, ref si, out pi))
                {
                    CloseHandle(pi.hThread);
                    CloseHandle(pi.hProcess);
                    //context.Undo();
                    try
                    {
                        return System.Diagnostics.Process.GetProcessById(pi.dwProcessId);
                    }
                    catch (ArgumentException e)
                    {
                        //The process ID couldn't be found - which is what always happens because it has closed
                        return null;
                    }
                }
                else
                {
                    int err = Marshal.GetLastWin32Error();
                    throw new System.ComponentModel.Win32Exception(err, "Could not create process.\nWin32 error: " + err.ToString());
                }
            }
            else
            {
                int err = Marshal.GetLastWin32Error();
                throw new System.ComponentModel.Win32Exception(err, "Could not create environment block.\nWin32 error: " + err.ToString());
            }
        }
        else
        {
            int err = System.Runtime.InteropServices.Marshal.GetLastWin32Error();
            if (err == 1008) return null; //There is no token
            throw new System.ComponentModel.Win32Exception(err, "Could not get the user token from session " + sessionID.ToString() + " - Error: " + err.ToString());
        }
    }

我正在使用该函数：

   protected override void OnStart(string[] args)
    {   
       _agentProcess = StartProcessInSession(WTSGetActiveConsoleSessionId(), "Some_correct_path");  
    }

这实际上工作了一段时间，但在我的一次运行中它突然停止工作。执行 CreateProccessAsUser 命令时出现以下错误（不能再深入）

{"Attempted to read or write protected memory. This is often an indication that other memory is corrupt."}

我不知道为什么会发生这种情况，甚至不知道如何进一步调试它，无论如何有任何想法吗？因为这对我来说没有任何意义。

CreateProcessas用户定义：

[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Auto)]
        static extern bool CreateProcessAsUser(IntPtr hToken, String lpApplicationName, [In] StringBuilder lpCommandLine, IntPtr /*to a SecurityAttributes struct or null*/ lpProcessAttributes, IntPtr /*to a SecurityAttributes struct or null*/ lpThreadAttributes, bool bInheritHandles, CreationFlags creationFlags, IntPtr lpEnvironment, String lpCurrentDirectory, ref StartupInfo lpStartupInfo, out ProcessInformation lpProcessInformation);

谢谢

Answer 1

您的 ProcessInformation 类型是值类型（结构）还是引用类型（类）？

显示其定义以及 CreateProcessAsUser 的 p/invoke 声明。

顺便说一句，如果您使用正确的属性，所有 GetLastWin32Error 检查都是通过 p/invoke 为您完成的。