重定向 cmd.exe 的输入和输出

问题描述

我想将 cmd.exe 输出重定向到某处，当命令为一行时，下面的代码可以工作:

I wanna redirect cmd.exe output somewhere, below code works when the command is a line:

Process p = new Process()
{
    StartInfo = new ProcessStartInfo("cmd")
    {
       UseShellExecute = false,
       RedirectStandardInput = true,
       RedirectStandardOutput = true,
       CreateNoWindow = true,
       Arguments = String.Format("/c "{0}"", command),
    }
};
p.OutputDataReceived += (s, e) => Messagebox.Show(e.Data);
p.Start();
p.BeginOutputReadLine();
p.WaitForExit();

但是像 WriteLine() 这样的一系列命令怎么样:

But how about a series commands like WriteLine():

p.StandardInput.WriteLine("cd...");
p.StandardInput.WriteLine("dir");

在这种情况下如何获得输出?

how to get output in this situation?

推荐答案

要实现这样的行为，您应该使用 /k 开关以交互模式运行 cmd.exe.

To achieve such behavior you should use /k switch to run cmd.exe in interactive mode.

问题在于将输入与不同的命令分开.为此，您可以使用 prompt 命令更改标准提示:

The problem is to separate inputs from different commands. To do this you could change the standard prompt using prompt command:

prompt --Prompt_C2BCE8F8E2C24403A71CA4B7F7521F5B_F659E9F3F8574A72BE92206596C423D5 

所以现在很容易确定命令输出的结束.

So now it is pretty easy to determine the end of command output.

完整代码如下:

public static IEnumerable<string> RunCommands(params string[] commands) {
    var process = new Process {
        StartInfo = new ProcessStartInfo("cmd") {
            UseShellExecute = false,
            RedirectStandardInput = true,
            RedirectStandardOutput = true,
            CreateNoWindow = true,
            Arguments = "/k",
        }
    };

    process.Start();

    const string prompt = "--Prompt_C2BCE8F8E2C24403A71CA4B7F7521F5B_F659E9F3F8574A72BE92206596C423D5 ";

    // replacing standard prompt in order to determine end of command output
    process.StandardInput.WriteLine("prompt " + prompt);
    process.StandardInput.Flush();
    process.StandardOutput.ReadLine();
    process.StandardOutput.ReadLine();

    var result = new List<string>();

    try {
        var commandResult = new StringBuilder();

        foreach (var command in commands) {
            process.StandardInput.WriteLine(command);
            process.StandardInput.WriteLine();
            process.StandardInput.Flush();

            process.StandardOutput.ReadLine();

            while (true) {
                var line = process.StandardOutput.ReadLine();

                if (line == prompt) // end of command output
                    break;

                commandResult.AppendLine(line);
            }

            result.Add(commandResult.ToString());

            commandResult.Clear();

        }
    } finally {
        process.Kill();
    }

    return result;
}

它运作良好，但看起来像一个大黑客.

It works well but it looks like one big hack.

我建议您改为使用每个命令的进程.

I'd recommend you to use process per command instead.

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