在Cocoa中将stdout重定向到NSTextView的最佳方法是什么？ [英] What is the best way to redirect stdout to NSTextView in Cocoa?

问题描述

Hi：我想将stdout重定向到一个NSTextView。这也可以与子进程的输出工作？

Hi: I want to redirect stdout to a NSTextView. Could this also work with outputs of subprocesses? What might be the best way to achieve this?

编辑：
根据Peter Hosey的答案，我实现了以下操作。但我没有收到通知。我做错了什么？

According to Peter Hosey answer I implemented the following. But I do not get a notification. What am I doing wrong?

NSPipe *pipe = [NSPipe pipe];
NSFileHandle *pipeHandle = [pipe fileHandleForWriting];
dup2(STDOUT_FILENO, [pipeHandle fileDescriptor]);
NSFileHandle *fileHandle = [[NSFileHandle alloc] initWithFileDescriptor:pipeHandle];
[fileHandle acceptConnectionInBackgroundAndNotify];

NSNotificationCenter *dnc = [NSNotificationCenter defaultCenter];
[dnc addObserver:self selector:@selector(handleNotification:) name:NSFileHandleConnectionAcceptedNotification object:fileHandle];

推荐答案

我希望做同样的事情，这个帖子。我读了这个和苹果的文档后，能够找出来。我在这里包括我的解决方案。 pipe和pipeReadHandle在接口中声明。在init方法中，我包含了以下代码：

I was looking to do the same thing and came across this post. I was able to figure it out after reading this and Apple's documentation. I'm including my solution here. "pipe" and "pipeReadHandle" are declared in the interface. In the init method I included the following code:

pipe = [NSPipe pipe] ;
pipeReadHandle = [pipe fileHandleForReading] ;
dup2([[pipe fileHandleForWriting] fileDescriptor], fileno(stdout)) ;

[[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(handleNotification:) name: NSFileHandleReadCompletionNotification object: pipeReadHandle] ;
[pipeReadHandle readInBackgroundAndNotify] ;

handleNotification：方法是

The handleNotification: method is

[pipeReadHandle readInBackgroundAndNotify] ;
NSString *str = [[NSString alloc] initWithData: [[notification userInfo] objectForKey: NSFileHandleNotificationDataItem] encoding: NSASCIIStringEncoding] ;
// Do whatever you want with str 

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