从Process.StandardOutput重定向二进制数据会导致错误的数据 [英] Redirect binary data from Process.StandardOutput causes corrputed data

问题描述

在中使用了Stream.CopyTo-Approach，以避免出现此情况问题。

解决方案

我发现了问题。输出的重定向是正确的，输入的读取似乎是问题所在。所以我将代码从以下位置更改为：

 使用（var streamReader = new StreamReader（configuration.Source））
 {
 process.StandardInput.Write（streamReader.ReadToEnd（））; 
 process.StandardInput.Flush（）; 
 process.StandardInput.Close（）; 
} 
  

至

 使用（var fileStream = new StreamReader（configuration.Source））
 {
 fileStream.BaseStream.CopyTo（process.StandardInput.BaseStream）; 
 process.StandardInput.Close（）; 
} 
  

不起作用！

对于所有可能遇到相同问题的人，此处为更正的代码：

  var process = new Process 
 {
 StartInfo = 
 {
参数= string.Format（@-display），
 FileName = configuration.PathToExternalSift，
 RedirectStandardError = true，
 RedirectStandardInput = true，
 RedirectStandardOutput = true，
 UseShellExecute = false，
 CreateNoWindow = true，
}，
 EnableRaisingEvents = true 
}; 
 
 process.ErrorDataReceived + =（ProcessErrorDataReceived）; 
 
 process.Start（）; 
 process.BeginErrorReadLine（）; 
 
 //读入文件
使用（var fileStream = new StreamReader（configuration.Source））
 {
 fileStream.BaseStream.CopyTo（process.StandardInput.BaseStream）; 
 process.StandardInput.Close（）; 
} 
 //将输出重定向到文件。 
使用（var fileStream = new FileStream（configuration.Destination，FileMode.OpenOrCreate））
 {
 process.StandardOutput.BaseStream.CopyTo（fileStream）; 
} 
 
流程。WaitForExit（）; 
  

On top of this problem, I have another. I try to get binary data from a external process, but the data(a image) seems to be corrupted. The screenshot below shows the corruption: The left image was done by executing the program on command line, the right one from code.

My Code so far:

var process = new Process
{
  StartInfo =
  {
    Arguments = string.Format(@"-display"),
    FileName = configuration.PathToExternalSift,
    RedirectStandardError = true,
    RedirectStandardInput = true,
    RedirectStandardOutput = true,
    UseShellExecute = false,
    CreateNoWindow = true,
  },
  EnableRaisingEvents = true
};

process.ErrorDataReceived += (ProcessErrorDataReceived);

process.Start();
process.BeginErrorReadLine();

//Reads in pbm file.
using (var streamReader = new StreamReader(configuration.Source))
{
  process.StandardInput.Write(streamReader.ReadToEnd());
  process.StandardInput.Flush();
  process.StandardInput.Close();
}
//redirect output to file.
using (var fileStream = new FileStream(configuration.Destination, FileMode.OpenOrCreate))
{
  process.StandardOutput.BaseStream.CopyTo(fileStream);
}

process.WaitForExit();

Is this some kind of encoding problem? I used the Stream.CopyTo-Approach as mentioned here in order to avoid there problems.

解决方案

I found the problem. The redirection of the output was correct, the reading of the input seems to be the problem. So I changed the code from:

using (var streamReader = new StreamReader(configuration.Source))
{
  process.StandardInput.Write(streamReader.ReadToEnd());
  process.StandardInput.Flush();
  process.StandardInput.Close();
}

to

using (var fileStream = new StreamReader(configuration.Source))
{
  fileStream.BaseStream.CopyTo(process.StandardInput.BaseStream);
  process.StandardInput.Close();
}

Not it works!

For all the people that might have the same problem, here the corrected code:

var process = new Process
{
  StartInfo =
  {
    Arguments = string.Format(@"-display"),
    FileName = configuration.PathToExternalSift,
    RedirectStandardError = true,
    RedirectStandardInput = true,
    RedirectStandardOutput = true,
    UseShellExecute = false,
    CreateNoWindow = true,
  },
  EnableRaisingEvents = true
};

process.ErrorDataReceived += (ProcessErrorDataReceived);

process.Start();
process.BeginErrorReadLine();

//read in the file.
using (var fileStream = new StreamReader(configuration.Source))
{
    fileStream.BaseStream.CopyTo(process.StandardInput.BaseStream);
    process.StandardInput.Close();
}
//redirect output to file.
using (var fileStream = new FileStream(configuration.Destination, FileMode.OpenOrCreate))
{
    process.StandardOutput.BaseStream.CopyTo(fileStream);
}

process.WaitForExit();

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