Question

代码应该运行python并接受来自StreamWriter的python命令。但只有关闭StreamWriter会导致代码执行 - 这没有用：

private Process p = new Process();
p.StartInfo = new ProcessStartInfo()
{
    FileName = "python",
    UseShellExecute = false,
    RedirectStandardInput = true,
    RedirectStandardOutput = false
};
p.Start();

//new Task(WriteInputTask).Start();

private StreamWriter sw = p.StandardInput;
sw.AutoFlush = true; //does nothing
sw.Write("print('Printing from python')" + Environment.NewLine);
sw.Flush(); //does nothing
sw.Close(); //NOW console shows "Printing from python"

每次我想发布新命令时，我都不想重新启动python并重新导入所有内容（特别是arcpy，导入需要半分钟）。 Close()对Flush()没有的缓冲区执行某些操作。

Answer 1

抱歉比我预期的要长一点。这是一个诡异的怪（即你不会在cmd中看到这种行为）。您需要添加＆＃39; -i＆＃39;启动时切换到python。这是一个完整的工作示例。

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace stackoverflow1 {
class Program {

    static void Main(string[] args) {
        var exe = "python";
        var arguments = "-i";

        Process p = new Process();
        p.StartInfo = new ProcessStartInfo() {
            FileName = exe,
            Arguments = arguments,
            UseShellExecute = false,
            RedirectStandardInput = true,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            StandardOutputEncoding = Encoding.UTF8,
            StandardErrorEncoding = Encoding.UTF8,
            CreateNoWindow = false,
        };

        p.OutputDataReceived += new DataReceivedEventHandler(
            delegate (object sendingProcess, DataReceivedEventArgs outLine) {
                Console.WriteLine("{0}: {1}", exe, outLine.Data);
                });

        p.ErrorDataReceived += new DataReceivedEventHandler(
            delegate (object sendingProcess, DataReceivedEventArgs errLine) {
                Console.WriteLine("Error: " + errLine.Data);
                });

        p.Start();
        p.BeginOutputReadLine();
        p.BeginErrorReadLine();

        StreamWriter sw = p.StandardInput;
        sw.AutoFlush = true; //does nothing

        if (exe == "cmd") {
            sw.WriteLine("echo hello");
            sw.WriteLine("echo 2+2");
            sw.WriteLine("echo Goodbye");
            }
        else { // assume python
            sw.WriteLine("print('Hello')");
            sw.WriteLine("2+2");
            sw.WriteLine("print('Printing from python')");
            sw.WriteLine("print('Goodbye')");
            }
        sw.Flush();

        System.Threading.Thread.Sleep(200);
        Console.WriteLine("Closing");
        sw.Close();

        Console.ReadKey();
        }
   }
}

在关闭输入流之前无法获取Process to Execute

1 个答案: