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using System;
using System.Diagnostics;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace DiscoBot
{
public class ConsoleAppManager
{
private readonly string appName;
private readonly Process process = new Process();
private readonly object theLock = new object();
private SynchronizationContext context;
private string pendingWriteData;
public ConsoleAppManager(string appName)
{
this.appName = appName;
this.process.StartInfo.FileName = this.appName;
this.process.StartInfo.RedirectStandardError = true;
this.process.StartInfo.StandardErrorEncoding = Encoding.UTF8;
this.process.StartInfo.RedirectStandardInput = true;
this.process.StartInfo.RedirectStandardOutput = true;
this.process.EnableRaisingEvents = true;
this.process.StartInfo.CreateNoWindow = true;
this.process.StartInfo.UseShellExecute = false;
this.process.StartInfo.StandardOutputEncoding = Encoding.UTF8;
this.process.Exited += this.ProcessOnExited;
}
public event EventHandler<string> ErrorTextReceived;
public event EventHandler ProcessExited;
public event EventHandler<string> StandartTextReceived;
public int ExitCode
{
get { return this.process.ExitCode; }
}
public bool Running
{
get; private set;
}
public void ExecuteAsync(params string[] args)
{
if (this.Running)
{
throw new InvalidOperationException(
"Process is still Running. Please wait for the process to complete.");
}
string arguments = string.Join(" ", args);
this.process.StartInfo.Arguments = arguments;
this.context = SynchronizationContext.Current;
this.process.Start();
this.Running = true;
new Task(this.ReadOutputAsync).Start();
new Task(this.WriteInputTask).Start();
new Task(this.ReadOutputErrorAsync).Start();
}
public void Write(string data)
{
if (data == null)
{
return;
}
lock (this.theLock)
{
this.pendingWriteData = data;
}
}
public void WriteLine(string data)
{
this.Write(data + Environment.NewLine);
}
protected virtual void OnErrorTextReceived(string e)
{
EventHandler<string> handler = this.ErrorTextReceived;
if (handler != null)
{
if (this.context != null)
{
this.context.Post(delegate { handler(this, e); }, null);
}
else
{
handler(this, e);
}
}
}
protected virtual void OnProcessExited()
{
EventHandler handler = this.ProcessExited;
if (handler != null)
{
handler(this, EventArgs.Empty);
}
}
protected virtual void OnStandartTextReceived(string e)
{
EventHandler<string> handler = this.StandartTextReceived;
if (handler != null)
{
if (this.context != null)
{
this.context.Post(delegate { handler(this, e); }, null);
}
else
{
handler(this, e);
}
}
}
private void ProcessOnExited(object sender, EventArgs eventArgs)
{
this.OnProcessExited();
}
private async void ReadOutputAsync()
{
var standart = new StringBuilder();
char[] buff = new char[1024];
int length;
while (this.process.HasExited == false)
{
standart.Clear();
length = await this.process.StandardOutput.ReadAsync(buff, 0, buff.Length);
char[] temp = new char[1024];
Array.Copy(buff, temp, length);
standart.Append(temp);
this.OnStandartTextReceived(standart.ToString());
Thread.Sleep(1);
}
this.Running = false;
}
private async void ReadOutputErrorAsync()
{
var sb = new StringBuilder();
do
{
sb.Clear();
var buff = new char[1024];
int length = await this.process.StandardError.ReadAsync(buff, 0, buff.Length);
char[] temp = new char[1024];
Array.Copy(buff, temp, length);
sb.Append(temp);
this.OnErrorTextReceived(sb.ToString());
Thread.Sleep(1);
}
while (this.process.HasExited == false);
}
private async void WriteInputTask()
{
while (this.process.HasExited == false)
{
Thread.Sleep(1);
if (this.pendingWriteData != null)
{
await this.process.StandardInput.WriteLineAsync(this.pendingWriteData);
await this.process.StandardInput.FlushAsync();
lock (this.theLock)
{
this.pendingWriteData = null;
}
}
}
}
}
}
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