Question

原始位置（strange behaviour on another process via Process.Start(startInfo)）不允许我正确发布测试代码。我必须在这里开始一个新问题。

我们的C＃（V3.5）需要调用C ++可执行文件来处理原始数据文件并为我们生成结果文件。

之前使用以下代码（没有ReadToEnd（）或ReadLine（）调用）：

startInfo.UseShellExecute = false;
startInfo.RedirectStandardError = true;
startInfo.RedirectStandardOutput = true;

现在输入的原始数据文件已更改（比以前更大）。我们对该可执行文件的调用将永远挂起。根据建议，我添加了ReadToEnd（）或ReadLine（）但它会挂起这些调用。所以我必须使用startInfo.UseShellExecute = true;或设置

startInfo.UseShellExecute = false; 
// and with
startInfo.RedirectStandardError = false;
startInfo.RedirectStandardOutput = false;

不知道为什么？

以下是我测试过的案例：

工作案例：

ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = false;
startInfo.RedirectStandardError = false;
startInfo.RedirectStandardOutput = false;
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.FileName = path;
startInfo.Arguments = rawDataFileName;
//startInfo.WorkingDirectory = Util.GetParentDirectory(path, 1);
try
{
    Process correctionProcess = Process.Start(startInfo);
    correctionProcess.WaitForExit();
}

工作案例：

ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = true;
startInfo.RedirectStandardError = false;//can be commented out
startInfo.RedirectStandardOutput = false;//can be commented out
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.FileName = path;
startInfo.Arguments = rawDataFileName;
startInfo.WorkingDirectory = Util.GetParentDirectory(path, 1);
try
{
    Process correctionProcess = Process.Start(startInfo);
    correctionProcess.WaitForExit();
}

非工作案例（使用ReadLine()）：

ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = false;
startInfo.RedirectStandardError = true;
startInfo.RedirectStandardOutput = true;
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.FileName = path;
startInfo.Arguments = rawDataFileName;
//startInfo.WorkingDirectory = Util.GetParentDirectory(path, 1);
try
{
    Process correctionProcess = Process.Start(startInfo);
    while (!correctionProcess.HasExited)
    {
        Log.logItem(LogType.Performance, "read errorMsg @@@@", "DPTM::correctData()", "");
        string errorMsg = correctionProcess.StandardError.ReadLine(); // <-- Hangs here
        Log.logItem(LogType.Performance, "read errorMsg", "DPTM::correctData()", "errorMsg=" + errorMsg);
        string outputMsg = correctionProcess.StandardOutput.ReadLine();
        Log.logItem(LogType.Performance, "read outputMsg", "DPTM::correctData()", "outputMsg=" + outputMsg);
        Thread.Sleep(100);
    }
}

非工作案例（使用ReadToEnd()）：

ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = false;
startInfo.RedirectStandardError = true;
startInfo.RedirectStandardOutput = true;
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.FileName = path;
startInfo.Arguments = rawDataFileName;
//startInfo.WorkingDirectory = Util.GetParentDirectory(path, 1);
try
{
    Process correctionProcess = Process.Start(startInfo);
    while (!correctionProcess.HasExited)
    {
        Log.logItem(LogType.Performance, "read errorMsg @@@@", "DPTM::correctData()", "");
        string errorMsg = correctionProcess.StandardError.ReadToEnd(); // <-- Hangs here!
        Log.logItem(LogType.Performance, "read errorMsg", "DPTM::correctData()", "errorMsg=" + errorMsg);
        string outputMsg = correctionProcess.StandardOutput.ReadToEnd();
        Log.logItem(LogType.Performance, "read outputMsg", "DPTM::correctData()", "outputMsg=" + outputMsg);
        Thread.Sleep(100);
    }
}

不是工作案例：

ProcessStartInfo startInfo = new ProcessStartInfo();
startInfo.CreateNoWindow = true;
startInfo.UseShellExecute = false;
startInfo.RedirectStandardError = true;
startInfo.RedirectStandardOutput = true;
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
startInfo.FileName = path;
startInfo.Arguments = rawDataFileName;
//startInfo.WorkingDirectory = Util.GetParentDirectory(path, 1);
try
{
    Process correctionProcess = Process.Start(startInfo);
    Log.logItem(LogType.Performance, "read errorMsg @@@@", "DPTM::correctData()", "");
    string errorMsg = correctionProcess.StandardError.ReadToEnd(); // <-- Hangs here!
    Log.logItem(LogType.Performance, "read errorMsg", "DPTM::correctData()", "errorMsg=" + errorMsg);
    string outputMsg = correctionProcess.StandardOutput.ReadToEnd();
    Log.logItem(LogType.Performance, "read outputMsg", "DPTM::correctData()", "outputMsg=" + outputMsg);
    correctionProcess.WaitForExit();
}

Answer 1

您在错误/输出缓冲区上死锁。您正在等待该过程完成时，您的第二个进程正在等待缓冲区释放。您需要异步读取输出/错误流以防止这种情况发生。

查看您的MSDN示例：哇，该示例真的令人困惑......如果将它们限制为std out或std错误，那么它会更容易理解。

您需要先设置数据处理程序

correctionProcess.OutputDataReceived += new DataReceivedEventHandler(OutputDataHandler);

然后致电

p.BeginOutputReadLine();

就像评论[令人困惑]建议不要尝试在那里阅读输出。改为使用处理程序。

    private void OutputDataHandler(object sendingProcess, DataReceivedEventArgs data)
    {
        if (data.Data != null)
        {
            // append data.Data to your internal buffer (StringBuilder?)
        }
    }

通过Process.Start（startInfo）在另一个进程上的奇怪行为 - 继续

1 个答案: