从重定向的输入/输出与（Python）进程交互时未命中DataReceivedEvent/

Question

我试图使用标准的输入和输出从C#控制python会话。在

启动Python进程后，我希望继续向它发送命令，并将输出接收到WinForms文本框。在

在尝试了许多SO答案和MSDN之后，对于为什么没有调用DataReceivedEvent处理程序有什么建议吗？完整代码如下：

注意，要从Python生成换行符，我在命令文本import os;print os.linesep中输入以下内容

using System;
using System.Diagnostics;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private static Process InterProc;
        public Form1()
        {
            InitializeComponent();
            InterProc = new Process();
            InitializeInterpreter();
        }

        private void InitializeInterpreter()
        {
            InterProc.StartInfo.UseShellExecute = false;
            InterProc.StartInfo.FileName = @"C:\Python27\python.exe";
            InterProc.StartInfo.RedirectStandardInput = true;
            InterProc.StartInfo.RedirectStandardOutput = true;
            InterProc.StartInfo.RedirectStandardError = true;
            InterProc.StartInfo.CreateNoWindow = true;
            InterProc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            InterProc.OutputDataReceived += new DataReceivedEventHandler(InterProcOutputHandler);

            bool started = InterProc.Start();

            InterProc.BeginOutputReadLine();
        }

        private void AppendTextInBox(TextBox box, string text)
        {
            if (this.InvokeRequired)
            {
                this.Invoke((Action<TextBox, string>)AppendTextInBox, OutputTextBox, text);
            }
            else
            {
                box.Text += text;
            }
        }

        private void InterProcOutputHandler(object sendingProcess, DataReceivedEventArgs outLine)
        {
            AppendTextInBox(OutputTextBox, outLine.Data + Environment.NewLine);
        }

        private void Enterbutton_Click(object sender, EventArgs e)
        {
            InterProc.StandardInput.WriteLine(CommandTextBox.Text);
        }
    }
}

Answer 1

这个答案是为那些在这里着陆的人准备的，他们希望在众多的答案中找到另一个答案。

最终与python会话交互的代码如下：
注1：使用'-i'参数调用Python。（请参阅下面的流程参数-i）
注意2：尝试同步读取std error freezed（Process.StandardError.ReadToEnd()）。因此std输出和错误流都需要提供处理程序回调（请参阅下面的InterProcOutputHandler）

using System;
using System.Diagnostics;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private static Process InterProc;
        public Form1()
        {
            InitializeComponent();
            InterProc = new Process();
            InitializeInterpreter();
        }

        private void InitializeInterpreter()
        {
            InterProc.StartInfo.FileName = @"C:\Python27\python.exe";
            InterProc.StartInfo.Arguments = @"-i"; // drops python into interactive mode after executing script if passed any
            InterProc.StartInfo.UseShellExecute = false;
            InterProc.StartInfo.RedirectStandardInput = true;
            InterProc.StartInfo.RedirectStandardOutput = true;
            InterProc.StartInfo.RedirectStandardError = true;
            InterProc.StartInfo.CreateNoWindow = true;
            InterProc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
            InterProc.OutputDataReceived += new DataReceivedEventHandler(InterProcOutputHandler);
            InterProc.ErrorDataReceived += new DataReceivedEventHandler(InterProcOutputHandler);

            bool started = InterProc.Start();

            InterProc.BeginOutputReadLine();
            InterProc.BeginErrorReadLine();
        }

        private void AppendTextInBox(TextBox box, string text)
        {
            if (InvokeRequired)
            {
                Invoke((Action<TextBox, string>)AppendTextInBox, OutputTextBox, text);
            }
            else
            {
                box.Text += text;
            }
        }

        private void InterProcOutputHandler(object sendingProcess, DataReceivedEventArgs outLine)
        {
            AppendTextInBox(OutputTextBox, outLine.Data + Environment.NewLine);
        }

        private void Enterbutton_Click(object sender, EventArgs e)
        {
            InterProc.StandardInput.WriteLine(CommandTextBox.Text);
        }
    }
}