无法向cmd.exe进程发送命令 [英] Not able to send commands to cmd.exe process

问题描述

我试图使用 StandardInput.WriteLine（str）发送命令到一个打开的cmd.exe进程，但是没有一个命令似乎被发送。首先我打开一个进程，使用全局变量p（ Process p ）。

I am trying to send commands to an open cmd.exe process using StandardInput.WriteLine(str), however none of the commands seem to be sent. First I open a process, with a global variable p (Process p).

p = new Process()
{
    StartInfo = {
        CreateNoWindow = true,
        UseShellExecute = false,
        RedirectStandardError = true,
        RedirectStandardInput = true,
        RedirectStandardOutput = true,
        FileName = @"cmd.exe",
        Arguments = "/C" //blank arguments
    }
};

p.Start();
p.WaitForExit();

之后，我尝试使用一个简单的方法发送一个命令， 。

After, I try to send a command using a simple method, that logs the result in a text box.

private void runcmd(string command)
{
    p.StandardInput.WriteLine(command);
    var output = p.StandardOutput.ReadToEnd();
    TextBox1.Text = output;
}

现在我用 DIR ，但 var output 显示为null，这将导致没有输出。有没有更好的方法发送命令到打开cmd.exe过程？

Right now I am testing it with DIR, but var output shows up as null, which results in no output. Is there a better way to send a command to the open cmd.exe process?

推荐答案

我永远不能让它工作同步读取stdout而不关闭stdin，但它对stdout / stderr的异步读取工作。不需要传入 / c ，只有在传递命令参数时才这样做;你不是这样做的，你是直接发送命令到输入。

I could never get it to work with synchronous reads of stdout without closing stdin, but it does work with async reading for stdout/stderr. No need to pass in /c, you only do that when passing in a command through the arguments; you are not doing this though, you are sending the command directly to the input.

        var p = new Process()
        {
            StartInfo = {
            CreateNoWindow = false,
            UseShellExecute = false,
            RedirectStandardError = true,
            RedirectStandardInput = true,
            RedirectStandardOutput = true,
            FileName = @"cmd.exe"}
        };
        p.OutputDataReceived += (sender, args1) => Console.WriteLine(args1.Data);
        p.ErrorDataReceived += (sender, args1) => Console.WriteLine(args1.Data);
        p.Start();
        p.BeginOutputReadLine();
        p.StandardInput.WriteLine("dir");
        p.StandardInput.WriteLine("cd e:");
        p.WaitForExit();

        Console.WriteLine("Done");
        Console.ReadLine();

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