我正在启动另一个进程（node.exe）以捕获其输出并在我自己的Winforms窗口中显示它。我的想法是，如果节点服务器崩溃，我将能够自动重启进程。包含的代码只是测试代码，而不是最终代码，并且它不会终止进程，因此如果您运行它，您需要在关闭表单后手动终止 。 / p>
我的问题是虽然我正确地重定向了输出和错误流，但是有一些有趣的角色无法在普通控制台上显示。如何更改它以正确检测编码并正确显示？
这是一个输出样本（每个字符串开头有一些乱码）。
[32m[2014-11-26 08:24:21.525] [INFO] console - [39mExpress server listening on port 8080
这是启动流程的代码，并重定向输出：
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
namespace AHVMonitor
{
enum Output
{
StandardOutput,
StandardError
}
public sealed class ProcessWatcher
{
private ConcurrentQueue<string> logLines = new ConcurrentQueue<string>();
private Process process;
private string arguments = ConfigurationManager.AppSettings["Arguments"];
private string filename = ConfigurationManager.AppSettings["Filename"];
public IList<string> Log
{
get { return logLines.ToArray(); }
}
public async Task<bool> WatchAsync()
{
Func<Task<bool>> waitForProcess = async () =>
{
var result = false;
process = new Process();
process.StartInfo.UseShellExecute = false;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.FileName = filename;
process.StartInfo.Arguments = arguments;
process.StartInfo.WorkingDirectory = Path.GetDirectoryName(filename);
// Hide the (empty) console window, since we are redirecting the output.
process.StartInfo.CreateNoWindow = true;
process.Start();
await TaskExtensions.ForAsync(0, 3, 3, async i =>
{
switch (i)
{
case 0:
await RedirectStandardErrorOrOutputAsync(Output.StandardOutput);
break;
case 1:
await RedirectStandardErrorOrOutputAsync(Output.StandardError);
break;
case 2:
result = await Task.Run(() =>
{
try
{
process.WaitForExit();
return process.ExitCode == 0;
}
catch { return false; }
finally
{
process.Dispose();
process = null;
}
});
break;
}
});
return result;
};
return await waitForProcess();
}
private async Task RedirectStandardErrorOrOutputAsync(Output outputType)
{
using (var reader = new StreamReader(outputType == Output.StandardError ? process.StandardError.BaseStream : process.StandardOutput.BaseStream))
{
var line = string.Empty;
while ((line = await reader.ReadLineAsync()) != null)
logLines.Enqueue(line);
}
}
}
}
要使该代码生效，您需要在3个任务上为 ForAsync 添加这两个扩展。 （包装不是我写的 ForEachAsync 实现。）
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace AHVMonitor
{
public static class TaskExtensions
{
#region IEnumerable<T>.ForEachAsync and IEnumerable<T>.ForAsync
/// <summary>A ForEachAsync implementation. Based on a sample in an article by Stephen Toub,
/// <a href="http://blogs.msdn.com/b/pfxteam/archive/2012/03/05/10278165.aspx">
/// Implementing a simple ForEachAsync, part 2</a>.</summary>
public static Task ForEachAsync<T>(this IEnumerable<T> source, int maxDegreeOfParallelism, Func<T, Task> body)
{
return Task.WhenAll(
from partition in Partitioner.Create(source).GetPartitions(maxDegreeOfParallelism)
select Task.Run(async () =>
{
using (partition)
while (partition.MoveNext())
await body(partition.Current);
}));
}
/// <summary>An asynchronous ForAsync implementation.</summary>
/// <remarks>It simply creates an <b>Enumerable.Range</b> and wraps <b>ForEachAsync</b>.</remarks>
public static Task ForAsync(int fromInclusive, int toExclusive, int maxDegreeOfParallelism, Func<int, Task> body)
{
return Enumerable.Range(
fromInclusive, toExclusive).
ForEachAsync(maxDegreeOfParallelism, async i => await body(i));
}
#endregion
}
}
使用＆＃34; ProcessWatcher＆＃34;的表单代码，只包含一个按钮和一个文本框，是这样的：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace AHVMonitor
{
public partial class WatcherForm : Form
{
private ProcessWatcher watcher = new ProcessWatcher();
public WatcherForm()
{
InitializeComponent();
}
private void WatcherForm_Load(object sender, EventArgs e)
{
LogAsync();
}
private async void LogAsync()
{
while (true)
{
await Task.Delay(TimeSpan.FromSeconds(1D));
var lines = watcher.Log;
logTextBox.Lines = lines.ToArray();
logTextBox.SelectionStart = logTextBox.TextLength;
logTextBox.ScrollToCaret();
}
}
private async void startButton_Click(object sender, EventArgs e)
{
await watcher.WatchAsync();
}
}
}