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.这是一个运行/usr/bin/grep foo bar.txt"的例子.

You can use NSTask. Here's an example that would run '/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:
%@", grepOutput);

NSPipe 和 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 的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.

包括对 NSLog 问题的修复

Included fix for NSLog problem

如果您使用 NSTask 通过 bash 运行命令行实用程序，那么您需要包含此魔术行以保持 NSLog 正常工作:

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:https://web.archive.org/web/20141121094204/https://cocoadev.com/HowToPipeCommandsWithNSTask

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