将 ProcessStartInfo.WorkingDirectory 设置为 UNC 路径

Question

我有一个在 VB.net 中编写的实用程序，它作为计划任务运行。它在内部调用另一个可执行文件，并且必须访问映射的驱动器。显然，Windows 在用户未登录时访问映射驱动器的计划任务存在问题，即使将身份验证凭据提供给任务本身也是如此。好的，好的。

为了解决这个问题，我刚刚将 UNC 路径传递给我的应用程序。

process.StartInfo.FileName = 'name of executable'
process.StartInfo.WorkingDirectory = '\\unc path\'
process.StartInfo.WindowStyle = ProcessWindowStyle.Hidden
process.StartInfo.Arguments = 'arguments to executable'
process.Start()

这与我对映射驱动器使用的实现相同，但是使用 UNC 路径时，进程的行为不像 UNC 路径是工作目录。

将 ProcessStartInfo.WorkingDirectory 设置为 UNC 路径是否存在任何已知问题？如果没有，我做错了什么？

Answer 1

当用户未登录时，映射驱动器的问题在于它们不存在。驱动器仅映射并可供当前登录的用户使用。如果没有人登录，则不会映射任何驱动器。

作为一种解决方法，您可以通过 CMD 运行，调用 PUSHD，它将您的 UNC 映射到幕后的驱动器，然后执行您的代码。我已经从我的 system32 复制了 tree.com 文件并将其作为“tree4.com”放在我的文件服务器上，并且此代码按预期工作（我还重定向标准输出，因此我可以看到调用的结果，但那是没必要）

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

    Using P As New Process()
        'Launch a standard hidden command window
        P.StartInfo.FileName = "cmd.exe"
        P.StartInfo.WindowStyle = ProcessWindowStyle.Hidden
        P.StartInfo.CreateNoWindow = True

        'Needed to redirect standard error/output/input
        P.StartInfo.UseShellExecute = False

        P.StartInfo.RedirectStandardInput = True
        P.StartInfo.RedirectStandardOutput = True

        'Add handler for when data is received
        AddHandler P.OutputDataReceived, AddressOf SDR

        'Start the process
        P.Start()

        'Begin async data reading
        P.BeginOutputReadLine()

        '"Map" our drive
        P.StandardInput.WriteLine("pushd \\file-server\File-Server")

        'Call our command, you could pass args here if you wanted
        P.StandardInput.WriteLine("tree2.com  c:\3ea7025b247d0dfb7731a50bf2632f")

        'Once our command is done CMD.EXE will still be sitting around so manually exit
        P.StandardInput.WriteLine("exit")
        P.WaitForExit()
    End Using

    Me.Close()
End Sub
Private Sub SDR(ByVal sender As Object, ByVal e As DataReceivedEventArgs)
    Trace.WriteLine(e.Data)
End Sub

Answer 2

我遇到了这个问题，接受的解决方案对我来说有点复杂。我所做的是采用 UNC 路径并将其内容复制到 [Path.GetTempDir()]\[Guid.NewGuid().ToString()]，然后将其用作 process.StartInfo.WorkingDirectory 的工作目录。将此功能包装在一个名为“Environment”的类中，该类将实现 IDisposable 并在 dispose 中清理您创建的临时目录。像这样（忽略设置参考）：

 using (var env = new ProcessEnvironment(settings))
                {
                    filePath = Path.Combine(env.WorkingDirectory, settings.ApplicationEXE);
                    var psi = new ProcessStartInfo
                    {
                        UseShellExecute = false,
                        FileName = filePath,
                        WorkingDirectory = env.WorkingDirectory,
                        Arguments = (args != null && args.Length > 0 ? String.Join(" ", args) : null)
                    };

                    var proc = Process.Start(psi);

                    if (env.ExecutingFromTempDir || settings.WaitForExit)
                        proc.WaitForExit();
                }

ProcessEnvironment 看起来像：

 class ProcessEnvironment : IDisposable
    {
        private Settings itsSettings;
        private string itsTempDestDirectory;
        public string WorkingDirectory { get; set; }
        public bool ExecutingFromTempDir { get { return !String.IsNullOrEmpty(itsTempDestDirectory); } }

        public ProcessEnvironment(Settings settings)
        {
            this.itsSettings = settings;

            WorkingDirectory = GetWorkingDirectory();
        }

        private string GetWorkingDirectory()
        {
            var dirInfo = new DirectoryInfo(itsSettings.StartupFolder);

            if (!IsUncDrive(dirInfo))
                return itsSettings.StartupFolder;

            return CreateWorkingDirectory(dirInfo);
        }

        private string CreateWorkingDirectory(DirectoryInfo dirInfo)
        {
            var srcPath = dirInfo.FullName;
            itsTempDestDirectory = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
            Directory.CreateDirectory(itsTempDestDirectory);

            //Now Create all of the directories
            foreach (string dirPath in Directory.GetDirectories(srcPath, "*", SearchOption.AllDirectories))
                Directory.CreateDirectory(dirPath.Replace(srcPath, itsTempDestDirectory));

            //Copy all the files & Replaces any files with the same name
            foreach (string newPath in Directory.GetFiles(srcPath, "*.*", SearchOption.AllDirectories))
                File.Copy(newPath, newPath.Replace(srcPath, itsTempDestDirectory), true);

            return itsTempDestDirectory;
        }

        private bool IsUncDrive(DirectoryInfo dirInfo)
        {
            Uri uri = null;
            if (!Uri.TryCreate(dirInfo.FullName, UriKind.Absolute, out uri))
            {
                return false;
            }
            return uri.IsUnc;
        }



        public void Dispose()
        {
            try
            {
                if (ExecutingFromTempDir)
                    Directory.Delete(itsTempDestDirectory, true);

            }
            catch (Exception ex)
            {  //do nothing - if we can't delete then we can't do it
                Console.WriteLine("Failed in Dispose: " + ex);
            }
        }
    }