从过程中获取值StandardOutput [英] Get Values from Process StandardOutput

问题描述

我试图让输出显示在我的机器上当前打开的文档，但它回来了NULL不管是什么。

I am attempting to get output to show the currently open documents on my machine, but it comes back NULL no matter what.

StringCollection values = new StringCollection();
var proc = new Process
{
     StartInfo = new ProcessStartInfo
     {
          FileName = "openfiles.exe",
          Arguments = "/query /FO CSV /v",
          UseShellExecute = false,
          RedirectStandardOutput = true,
          CreateNoWindow = true
     }
};
proc.Start();
while (!proc.StandardOutput.EndOfStream)
{
     string line = proc.StandardOutput.ReadLine();
     values.Add(line);
}
foreach (string sline in values)
MessageBox.Show(sline);

编辑：

在进一步审查我看到，我得到一个异常的问题。在我的诊断来看，我得到如下： Proc.BasePriority THRE的异常类型System.InvalidOperationException的

During further review I see that I am getting an exception issue. During my diag run I get the following: Proc.BasePriority thre an exception of type System.InvalidOperationException

编辑：

试图去拉code为：

string val = proc.StandardOutput.ReadToEnd();
MessageBox.Show(val);

另外一个NULL值的回报，PROC仍然有错误，甚至proc.start后（）;

Also a NULL value on return, and Proc still had errors even after proc.start();.

推荐答案

您已经阅读了标准误差和错误流。因为你不能同时在同一个线程读取它们，你必须USDE异步方法和的事件处理器。 当我运行此code我看到openFiles散只能在32位OS-ES运行。从错误流中读取的行是prepended有！ >让他们脱颖而出的输出。

You have to read both standard error and error streams. Because you can't read them both from the same thread you have to usde the async methods and eventhandlers. When I run this code I see that openfiles can only be run on 32 bits OS-es. The lines that are read from the error stream are prepended with ! > so they stand out in the output.

    StringCollection values = new StringCollection();
    var proc = new Process
    {
        StartInfo = new ProcessStartInfo
        {
            FileName = "openfiles.exe",
            Arguments = "/query /FO CSV /v",
            UseShellExecute = false,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            CreateNoWindow = false
        }
    };
    proc.Start();

    proc.OutputDataReceived += (s,e) => {
        lock (values)
        {
            values.Add(e.Data);
        }
    };
    proc.ErrorDataReceived += (s,e) => {
        lock (values)
        {
            values.Add("! > " + e.Data);
        }
    };

    proc.BeginErrorReadLine();
    proc.BeginOutputReadLine();

    proc.WaitForExit();
    foreach (string sline in values)
        MessageBox.Show(sline);

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