Question

我正在尝试以下代码

Process p = new Process();
        ProcessStartInfo info = new ProcessStartInfo();
        info.FileName = "cmd.exe";
        info.RedirectStandardInput = true;
        info.UseShellExecute = false;

        p.StartInfo = info;
        p.Start();

        using (StreamWriter sw = new StreamWriter(p.StandardInput.BaseStream))
        {
            if (sw.BaseStream.CanWrite)
            {                    
                sw.WriteLine(@"dir");                    
            }
        }

        using (StreamWriter sw = new StreamWriter(p.StandardInput.BaseStream))
        {
            if (sw.BaseStream.CanWrite)
            {                 
                sw.WriteLine(@"dir");
            }
        }

第一个sw.writeline正常，但第二个我发现这个过程是正确的。

进程退出的原因，以及如何让它继续运行以执行更多命令？

Answer 1

将两个写入命令放在同一个使用块中，并省略第二个使用块。离开块后，using-block将丢弃StreamWriter。处理StreamWriter会关闭底层流并导致cmd退出。

Answer 2

我解决了这个问题

static Queue<string> CmdQueue = new Queue<string>();
    static Thread ThreadCMD = new Thread(new ThreadStart(CMDThread));

    private static void CMDThread()
    {
        bool Active = true;         // used to indicate the status of the session 

        ProcessStartInfo psiOpt = new ProcessStartInfo();

        psiOpt.FileName = "cmd.exe";
        psiOpt.WindowStyle = ProcessWindowStyle.Hidden;
        psiOpt.RedirectStandardOutput = true;
        psiOpt.RedirectStandardInput = true;
        psiOpt.RedirectStandardError = true;
        psiOpt.UseShellExecute = false;
        psiOpt.CreateNoWindow = true;


        Process procCommand = Process.Start(psiOpt);
        procCommand.OutputDataReceived += ProcCommand_OutputDataReceived;
        procCommand.ErrorDataReceived += ProcCommand_ErrorDataReceived;
        procCommand.BeginOutputReadLine();
        procCommand.BeginErrorReadLine();


        using (StreamWriter sw = procCommand.StandardInput)
        {
            while (Active)
            {
                while (CmdQueue.Count==0) { }
                string cmd = CmdQueue.Dequeue();
                if (cmd != "cmdexit")
                {                        
                    sw.WriteLine(cmd);                        
                }
                else
                {
                    Active = false;
                }
            }
        }
        procCommand.OutputDataReceived -= ProcCommand_OutputDataReceived;
        procCommand.ErrorDataReceived -= ProcCommand_ErrorDataReceived;
        procCommand.Close();
    }

    private static void ProcCommand_ErrorDataReceived(object sender, DataReceivedEventArgs e)
    {
        PushCMDResult(Encoding.ASCII.GetBytes(e.Data));
    }

    private static void ProcCommand_OutputDataReceived(object sender, DataReceivedEventArgs e)
    {
        PushCMDResult(Encoding.ASCII.GetBytes(e.Data));
    }

    public void StartCMD()
    {
        ThreadCMD.Start();
    }

    public void Execute(string cmd)
    {
        CmdQueue.Enqueue(cmd);
    }

我可以启动cmd.exe会话，并使用execute执行所需数量的命令，以便将队列中的cmd字符串排入队列，该字符串将写入该编写器。我也使用异步读取输出和错误。

c＃流程开始继续

2 个答案: