如何在NSTextView中轻松重定向控制台输出？ [英] How can I easily redirect the console output in a NSTextView?

问题描述

假设您有一个Cocoa应用程序的代码，它通过NSlogs和printfs将自己的消息记录到控制台输出。我的目标是在NSView中将所有这些输出重定向到一个单独的NSWindow。

如何以

• 最小化要重写的代码量


• 可以还原



• >解决方案

  这里是我想出的解决方案：

  
  
  1. 创建一个NSWindowController有一个NSTextView作为（我们称之为 A ）
  
  
  2. 创建一个封装A对象的Singleton类（让我们称之为 B 使用 readInBackgroundAndNotify 从 NSFileHandle中读取一个文件（包含所有记录）将字符串发送到A（将其附加到它的NSTextView） code>。通知它时调用追加方法。它还有一个方法用于启动日志记录文件，它使用 freopen（3）将一些流（stderr和stdout atm）重定向到一个附加模式的文件。 / li>

  3. 在项目中只需调用B的开始日志记录方法（无需实例化，但我想它真的没有关系）。
  
  
  
  
  

  这个解决方案是考虑到Joshua Nozzi的答案和tlindner的答案，并结合它们。我有和封装的解决方案，尊重三个请求的问题（我只需要添加一行代码，我可以轻松地回复，我可以在其他应用程序中使用此解决方案）。我注意到，有时可能是错误的有一个NSWindowController封装这种方式（而所有其他的是由一些超级控制器管理）。

  
  
  

  我终于选择了文件解决方案，因为它是非常容易实现和更像Cocoa的比tlindner的一个。它还提供了一个日志文件持久存储在磁盘上的机会。但是当然我可能错过了一些，指出在我的评论请^^

  
  

  Suppose you have the code of a Cocoa app which logs its own messages through NSlogs and printfs to the Console output. My goal is to redirect all this output into a separate NSWindow in a NSView.

  How can I achieve this in a way that

  • minimizes the amount of code to rewrite
  • makes it possible to revert back
  • maximizes the reuse of written code

  (the usual software engineering guide lines)?

  解决方案

  Here is the solution I came up with:

  1. Create an NSWindowController that has a NSTextView as an outlet (let's call this A)
  2. Create a Singleton class (let's call this B) that encapsulates an A object and provides some methods for sending strings to A (which appends it to its NSTextView) by reading a file (which contains all the loggings) using readInBackgroundAndNotify from NSFileHandle. When notified it calls the appending method. It has a method for starting the logging on file as well, which uses freopen(3) to redirect some stream (stderr and stdout atm) to a file in append mode.
  3. In the project just call the starting logging method of B (no needs of instantiation, but I guess it really does not matter) after importing it.

  This solution was created considering both Joshua Nozzi's answer and tlindner's one, and combines them. I have and encapsulated solution that respects the three requests in the question (I have to add only a line of code, I can revert back easily and I can use this solution in other apps too). I noticed that maybe sometimes it can be wrong to have an NSWindowController encapsulated this way (whereas all the other ones are managed by some super-controller).

  I finally opted for the file solution since it is very easy to implement and more Cocoa-like than tlindner's one. Also it gives the opportunity to have a logging file that persists on the disk. But of course I may have missed something, point that to me in the comments please ^^

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