如何正确地将控制台输出重定向到字符串？ [英] How do I redirect console output to string correctly?

问题描述

您好

我使用Windows Form使用命令行。我正在尝试将控制台输出正确地重定向到字符串，所以我可以使用Regex获取文本，但它不是我想要的，它只是输出这样的东西：

Hello
I work with Windows Form with command lines. I'm trying to redirect console output to string correctly so I can grab the text using Regex but it does not what i wanted to, It just output something like this:

Microsoft Windows [Version 10.0.15063]
(c) 2017 Microsoft Corporation. Alle rettigheder forbeholdes.

D:\example\test >> "D:\example\test\log.txt"

D:\example>aapt.exe dump badging <filepath>

D:\example>

请参阅，它输出版权和我的输入。它并没有从aapt.exe输出任何东西。



这是我使用的代码

See, it outputs copyright and my inputs. It doesn't really output something from aapt.exe.

This is the code i used

p.StartInfo.FileName = "cmd.exe";
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.CreateNoWindow = true;

p.Start();
p.StandardInput.WriteLine("aapt.exe dump badging \"" + path + "\"");
p.StandardInput.Close();
string str = p.StandardOutput.ReadToEnd();

我尝试了什么：



我尝试尝试在互联网上找到的其他代码，但它的确与我的相同，输出版权，版本和输入，不输出任何有用的东西。在互联网上没有什么有用的信息。



我总是不得不将控制台输出重定向到文件作为解决方法，如下所示：

What I have tried:

I tried to try other codes i found on the internet but it does the same way as mine, outputs copyright, version and inputs, doesn't output anything useful. There is nothing much useful infomation on the internet.

I always had to redirect console output to file as a workaround, like this:

p.Start();
p.StandardInput.WriteLine("aapt.exe dump badging \"" + path + "\" >> \"" + logs + "\" 2>&1");
p.StandardInput.Close();

因此它输出以下版本，没有版权，Windows版本和我的输入

So it outputs the following without copyright, windows version and my inputs

package: name='org.schabi.newpipe' versionCode='27' versionName='0.9.0' platformBuildVersionName='7.1.1'
sdkVersion:'15'
targetSdkVersion:'25'
uses-permission: name='android.permission.INTERNET'
uses-permission: name='android.permission.WAKE_LOCK'
uses-permission: name='android.permission.ACCESS_NETWORK_STATE'
uses-permission: name='android.permission.WRITE_EXTERNAL_STORAGE'
uses-permission: name='android.permission.SYSTEM_ALERT_WINDOW'
application-label:'NewPipe'
application-label-af:'NewPipe'
...

我希望你能帮助我。

谢谢。

I hope you can help me.
Thank you.

推荐答案

一个问题可能是你没有知道的方式，当aapt.exe完成执行并读取时任何输出发生之前的流。请记住，您正在创建一个与您的应用程序并行运行的进程。



您通过调用shell然后模拟输入来创建这个不必要的复杂。这里有一个代码段，可以为您执行相同操作并为您提供更多控制权，例如：等待你的过程完成：

One problem could be that you have no way of knowing, when the aapt.exe completes execution and read the streams before any output happened. Remember, you are creating a process that is running in parallel with your application.

You are making this unnecessary complex by invoking a shell and then simulating an input. Here a snippet that should do the same for you and gives you more control, e.g. over waiting for your process to complete:

// Execute the program
p.StartInfo.FileName = "aapt.exe";
p.StartInfo.WorkingDirectory = "<path to aapt.exe>";
p.StartInfo.Arguments = "dump badging \"" + path + "\"";
p.StartInfo.UseShellExecute = false;
p.StartInfo.RedirectStandardOutput = true;
p.StartInfo.RedirectStandardError = true;
p.StartInfo.RedirectStandardInput = true;
p.StartInfo.CreateNoWindow = true;
p.Start();
string str = p.StandardOutput.ReadToEnd();
p.WaitForExit();

// Execute another program
p2.StartInfo.FileName = "adb.exe";
p2.StartInfo.WorkingDirectory = "<path to adb.exe>";
p2.StartInfo.Arguments = "<arguments for adb.exe>";
p2.StartInfo.UseShellExecute = false;
p2.StartInfo.RedirectStandardOutput = true;
p2.StartInfo.RedirectStandardError = true;
p2.StartInfo.RedirectStandardInput = true;
p2.StartInfo.CreateNoWindow = true;
p2.Start();
string str2 = p2.StandardOutput.ReadToEnd();
p2.WaitForExit();

现在输出应该是str。

根据应用程序写入其输出的流，您可能需要阅读 p.StandardError.ReadToEnd（）。 （在第二个示例中，您使用 2>& 1 重定向到同一个日志文件。）

Now the output should be in str.
Depending to which stream the application writes its output, you might need to read p.StandardError.ReadToEnd(). (In your second sample you are redirecting both to the same log file with "2>&1".)

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