如何从在本地控制台上使用 C# SSH.NET 执行的远程主机(Raspberry Pi)上运行的 Python 程序连续写入输出? [英] How to continuously write output from Python Program running on a remote host (Raspberry Pi) executed with C# SSH.NET on local console?

问题描述

我正在我的计算机上用 C# 编写一个程序，它应该在远程 Raspberry Pi 上启动一个 Python 程序.目前，Python 代码只是每秒打印 'Hello'.该程序应该永久运行.当我从 C# 启动这个程序时，我希望有一个视觉反馈，如果我的程序正在运行 - 我希望看到像 PuTTY 一​​样的打印输出.

I'm writing a program in C# on my computer which should start a Python program on a remote Raspberry Pi. For the moment the Python code is just printing 'Hello' every second. The program should run permanently. When I start this program from C#, I would like to have a visual feedback, if my program is running – I'd like to see the printed output like in PuTTY.

以下代码适用于像 ls 这样的命令.但是由于我的 Python 程序 test.py 不应该完成——我从来没有得到输出——我陷入了一个连续的循环.

The following code works fine for a command like ls. But for the reason that my Python program test.py should not finish – I never get an output – I's stuck in a continuous loop.

如何实时显示输出?

这是我的代码:

using Renci.SshNet;

static void Main(string[] args)
{
    var ssh = new SshClient("rpi", 22, "pi", "password");
    ssh.Connect();

    var command = ssh.CreateCommand("python3 test.py");
    var asyncExecute = command.BeginExecute();

    while (true)
    {
        command.OutputStream.CopyTo(Console.OpenStandardOutput());
    }
}

推荐答案

SSH.NET SshClient.CreateCommand 不使用终端仿真.

SSH.NET SshClient.CreateCommand does not use a terminal emulation.

Python 在没有终端仿真的情况下执行时会缓冲输出.所以你最终会得到输出，但只有在缓冲区填满之后.

Python buffers the output, when executed without terminal emulation. So you would get the output eventually, but only after the buffer fills.

为了防止缓冲，添加-u切换到python命令行:

To prevent the buffering, add -u switch to python commandline:

var command = ssh.CreateCommand("python3 -u test.py");

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