Question

So I have a process (java commandline application) that is hidden with the output and input being redirected. I can read the output very easily and that works, but when I send a command it dosen’t work.

I think that I have determined that the input is not being redirected because:

(A) When I send WriteLine(//command here); Flush no command is acknowledged by the program

(B) When I unhide the cmd window (StartInfo.CreateNoWindow = false;) I can enter commands and run them (in the cmd window) even though the StandardInput is being redirected (StartInfo.RedirectStandardInput = true;)

Here is the code:

namespace bukkit
{
    public partial class Form1 : Form
{
    private static StringBuilder _txt = new StringBuilder();
    private static bool _scrolled = false;
    Process mncrft = new Process();

    public Form1()
    {
        InitializeComponent();

        mncrft.StartInfo.WorkingDirectory = Path.GetTempPath();
        mncrft.StartInfo.Arguments = "-Xmx512M -Xms512M -jar C:\\mncrft\\mncrft.jar";
        mncrft.StartInfo.FileName = "java.exe";
        mncrft.StartInfo.UseShellExecute = false;
        mncrft.StartInfo.RedirectStandardOutput = true;
        mncrft.StartInfo.RedirectStandardError = true;
        mncrft.StartInfo.RedirectStandardInput = true;
        mncrft.StartInfo.CreateNoWindow = false;
        mncrft.ErrorDataReceived += build_ErrorDataReceived;
        //mncrft.OutputDataReceived += build_ErrorDataReceived;
        mncrft.EnableRaisingEvents = true;
        //mncrft.StandardInput.NewLine = "\r\n";
        mncrft.Start();
        mncrft.BeginOutputReadLine();
        mncrft.BeginErrorReadLine();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        _txt.AppendLine("Starting Minecraft...");
    }

    private void Form1_Close(object sender, EventArgs e)
    {
        mncrft.Close();
    }

    static void build_ErrorDataReceived(object sender, DataReceivedEventArgs e)
    {
        string msg = e.Data;
        if (msg != null && msg.Length > 0)
        {
            _txt.AppendLine(msg);
            _scrolled = false;
        }
    }

    private void mainTimer_Tick(object sender, EventArgs e)
    {
        if (_txt.Length > 0)
        {
            txtOutput.Text = _txt.ToString();

            // scroll down
            if (_scrolled == false)
            {
                txtOutput.SelectionStart = txtOutput.Text.Length;
                txtOutput.ScrollToCaret();
                _scrolled = true;
            }
        }
    }

    private void Execute_Click(object sender, EventArgs e)
    {
        if (textBox1.Text.Length > 0)
        {
            mncrft.StandardInput.WriteLine(textBox1.Text);
            mncrft.StandardInput.Flush();
        }
    }
}
}

How can I redirect the input so that I can send commands?

Thanks,
Adam

P.S: If this is confusing, just put a comment down and I will gladly clarify.

Answered

Thanks to Tim,
Replace the following lines:

mncrft.StartInfo.FileName = "java.exe";
mncrft.StartInfo.Arguments = "-Xmx512M -Xms512M -jar C:\\mncrft\\mncrft.jar";

with:

mncrft.StartInfo.FileName = "java";
mncrft.StartInfo.Arguments = "-Xmx512M -Xms512M -jar C:\\mncrft\\bukkit.jar -nojline";

Answer 1

Ok, I was messing with this all day, and I found the answer. When you launch bukkit with your application you need to include ‘-nojline’ to your process Arguments. This makes bukkit’s inputs work correctly with the standardinput.

https://github.com/Bukkit/CraftBukkit/commit/22a44d47ac48fb65bb61fb823c84bff9494f5033