Process.Start捕獲標准輸出字符

Question

我有一個Windows服務，將處理來自plink.exe（Putty / SSH的東西）的結果。 我目前正成功捕獲標准輸出並通過標准輸入向過程發送命令。

我的問題是，在我從控制台應用程序進程收到換行符之前， OutputDataReceived事件似乎沒有被提升。 該過程提示輸入密碼，直到輸入密碼后才會出現換行符。

所以我的問題是，有沒有辦法逐個字符地處理標准輸出，而不是從System.Diagnostics.Process類逐行處理？

這是我的代碼：

_processInfoTest = new ProcessStartInfo();
_processInfoTest.FileName = serviceSettings.PlinkExecutable;
_processInfoTest.Arguments = GetPlinkArguments(serviceSettings);
_processInfoTest.RedirectStandardOutput = true;
_processInfoTest.RedirectStandardError = true;
_processInfoTest.RedirectStandardInput = true;
_processInfoTest.UseShellExecute = false;
_processInfoTest.CreateNoWindow = true;

_processTest = new Process();
_processTest.StartInfo = _processInfoTest;
_processTest.OutputDataReceived += processTest_OutputDataReceived;
_processTest.ErrorDataReceived += processTest_OutputDataReceived;
_processTest.Start();

_processTest.BeginOutputReadLine();
_processTest.BeginErrorReadLine();

以及處理傳入文本行的事件處理程序：

private static void processTest_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    string line = e.Data;

    if (line != null)
    {
        WcfServerHelper.BroadcastRemoteCallback(x => x.PlinkTextOutput(line, DateTime.Now));

        if (line.Contains("If you do not trust this host, press Return to abandon the"))
        {
            _processTest.StandardInput.Write("y");
            _processTest.StandardInput.Write("\n");
            _processTest.StandardInput.Flush();
        }

        // This code never gets called because the event doesn't get raised until a line-break occurs
        if (line.Contains("'s password:"))
        {
            _processTest.StandardInput.Write("mypassword");
            _processTest.StandardInput.Write("\n");
            _processTest.StandardInput.Flush();
        }

        if (line.Contains("Access granted"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.Success));
        }
        else if (line.Contains("Access denied") || line.Contains("Password authentication failed"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.InvalidUserOrPass));
        }
        else if (line.Contains("Host does not exist"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.InvalidHostname));
        }
        else if (line.Contains("Connection timed out"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.TimedOut));
        }
    }
}

謝謝！

Answer 1

您正在使用的事件是行緩沖...您必須實現自己的讀取器，在流讀取器上調用Read（）/ ReadAsync（）以獲取每個char ...

Answer 2

我一直在尋找答案，在問這里問題之后，我找到了解決辦法。

順便說一句，感謝DarkSquirrel，你的頭部釘了一下。

這是我的解決方案：

_processInfoTest = new ProcessStartInfo();
_processInfoTest.FileName = serviceSettings.PlinkExecutable;
_processInfoTest.Arguments = GetPlinkArguments(serviceSettings);
_processInfoTest.RedirectStandardOutput = true;
_processInfoTest.RedirectStandardError = true;
_processInfoTest.RedirectStandardInput = true;
_processInfoTest.UseShellExecute = false;
_processInfoTest.CreateNoWindow = true;

WcfServerHelper.BroadcastRemoteCallback(x => x.PlinkTextOutput(_processInfoTest.Arguments, DateTime.Now));

_processTest = new Process();
_processTest.StartInfo = _processInfoTest;
_processTest.Start();

Task.Factory.StartNew(() =>
    {
        ProcessOutputCharacters(_processTest.StandardError);
    });

Task.Factory.StartNew(() =>
    {
        ProcessOutputCharacters(_processTest.StandardOutput);
    });

我的方法：

private static void ProcessOutputCharacters(StreamReader streamReader)
{
    int outputCharInt;
    char outputChar;
    string line = string.Empty;

    while (-1 != (outputCharInt = streamReader.Read()))
    {
        outputChar = (char)outputCharInt;
        if (outputChar == '\n' || outputChar == '\r')
        {
            if (line != string.Empty)
            {
                ProcessLine("Output: " + line);
            }

            line = string.Empty;
        }
        else
        {
            line += outputChar;

            if (line.Contains("login as:"))
            {
                _processTest.StandardInput.Write("myusername");
                _processTest.StandardInput.Write("\n");
                _processTest.StandardInput.Flush();
            }

            if (line.Contains("'s password:"))
            {
                _processTest.StandardInput.Write("mypassword");
                _processTest.StandardInput.Write("\n");
                _processTest.StandardInput.Flush();
            }
        }
    }
}

private static void ProcessLine(string line)
{
    if (line != null)
    {
        WcfServerHelper.BroadcastRemoteCallback(x => x.PlinkTextOutput(line, DateTime.Now));

        if (line.Contains("If you do not trust this host, press Return to abandon the"))
        {
            _processTest.StandardInput.Write("y");
            _processTest.StandardInput.Write("\n");
            _processTest.StandardInput.Flush();
        }

        if (line.Contains("Access granted"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.Success));
        }
        else if (line.Contains("Access denied") || line.Contains("Password authentication failed"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.InvalidUserOrPass));
        }
        else if (line.Contains("Host does not exist"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.InvalidHostname));
        }
        else if (line.Contains("Connection timed out"))
        {
            if (!_processTest.HasExited)
                _processTest.Kill();

            WcfServerHelper.BroadcastRemoteCallback(x => x.TestConnectionCallback(PlinkStatus.TimedOut));
        }
    }

}

我現在唯一的問題是當我發送用戶名或密碼（通過StandardInput）時，它只發送前5個字符。 我將對這個問題進行一些研究，如果需要的話，將其作為一個單獨的問題發布。

謝謝！