从Cocoa应用程序执行终端命令 [英] Execute a terminal command from a Cocoa app

问题描述

如何从我的Objective-C Cocoa应用程序执行终端命令（如 grep ）？

How can I execute a terminal command (like grep) from my Objective-C Cocoa application?

推荐答案

您可以使用 NSTask 。这里有一个例子，运行 / usr / bin / grep foo bar.txt '。

int pid = [[NSProcessInfo processInfo] processIdentifier];
NSPipe *pipe = [NSPipe pipe];
NSFileHandle *file = pipe.fileHandleForReading;

NSTask *task = [[NSTask alloc] init];
task.launchPath = @"/usr/bin/grep";
task.arguments = @[@"foo", @"bar.txt"];
task.standardOutput = pipe;

[task launch];

NSData *data = [file readDataToEndOfFile];
[file closeFile];

NSString *grepOutput = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
NSLog (@"grep returned:\n%@", grepOutput);

NSPipe NSFileHandle 用于重定向任务的标准输出。

NSPipe and NSFileHandle are used to redirect the standard output of the task.

有关在Objective-C应用程序中与操作系统交互的更多详细信息，您可以在Apple开发中心查看此文档：与操作系统交互。

For more detailed information on interacting with the operating system from within your Objective-C application, you can see this document on Apple's Development Center: Interacting with the Operating System.

编辑：包含NSLog问题的修复

Included fix for NSLog problem

如果您使用NSTask运行命令行实用程序bash，那么你需要包含这个魔术线来保持NSLog的工作：

If you are using NSTask to run a command-line utility via bash, then you need to include this magic line to keep NSLog working:

//The magic line that keeps your log where it belongs
task.standardOutput = pipe;

解释在这里： http://cocoadev.com/HowToPipeCommandsWithNSTask

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