重定向标准输入和标准输出。NET中 [英] Redirecting stdin and stdout in .Net

问题描述

我想重定向标准输入一个控制台应用程序和stdout，这样我就可以通过F＃与它们进行交互。然而，根据不同的控制台应用程序的明显code似乎失败。下面的F＃code适用于 DIR 但蟒蛇失败（挂起）， FSI ：

I'm trying to redirect stdin and stdout of a console application, so that I can interact with them via F#. However, depending on the console application the obvious code seems to fail. The following F# code works for dir but fails (hangs) for python and fsi:

open System
open System.Diagnostics

let f = new Process()
f.StartInfo.FileName <- "python"
f.StartInfo.UseShellExecute <- false
f.StartInfo.RedirectStandardError <- true
f.StartInfo.RedirectStandardInput <- true
f.StartInfo.RedirectStandardOutput <- true
f.EnableRaisingEvents <- true
f.StartInfo.CreateNoWindow <- true
f.Start()
let line = f.StandardOutput.ReadLine()

这挂起蟒蛇，但工程目录。

This hangs for python but works for dir.

这是否有做Python和FSI使用readline的还是我做一个明显的错误？有周围的工作，让我与来自F＃FSI或Python REPL互动？

Does this have do with python and fsi using readline or am I making an obvious mistake? Is there a work around that would allow me to interact with fsi or python REPL from F#?

推荐答案

这就是你正在寻找的code（这是我方便已经写在第9章，脚本;）正如前面提到的，的ReadLine阻塞，直到有全线从而导致各种挂起。最好的办法是挂钩到OutputDataRecieved事件。

This is the code you are looking for (which I conveniently have written in Chapter 9, Scripting ;) As mentioned earlier, ReadLine blocks until there is a full line which leads to all sorts of hangs. Your best bet is to hook into the OutputDataRecieved event.

open System.Text
open System.Diagnostics

let shellEx program args =

    let startInfo = new ProcessStartInfo()
    startInfo.FileName  <- program
    startInfo.Arguments <- args
    startInfo.UseShellExecute <- false

    startInfo.RedirectStandardOutput <- true
    startInfo.RedirectStandardInput  <- true

    let proc = new Process()
    proc.EnableRaisingEvents <- true

    let driverOutput = new StringBuilder()
    proc.OutputDataReceived.AddHandler(
        DataReceivedEventHandler(
            (fun sender args -> driverOutput.Append(args.Data) |> ignore)
        )
    )

    proc.StartInfo <- startInfo
    proc.Start() |> ignore
    proc.BeginOutputReadLine()

    // Now we can write to the program
    proc.StandardInput.WriteLine("let x = 1;;")
    proc.StandardInput.WriteLine("x + x + x;;")
    proc.StandardInput.WriteLine("#q;;")

    proc.WaitForExit()
    (proc.ExitCode, driverOutput.ToString())

输出（可以忍受被prettied起来）：

Output (which could stand to be prettied up):

val it : int * string =
  (0,
   "Microsoft F# Interactive, (c) Microsoft Corporation, All Rights ReservedF# Version 1.9.7.8, compiling for .NET Framework Version v2.0.50727For help type #help;;> val x : int = 1> val it : int = 3> ")

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