在Objective-C中，如何使用posix_spawn替换废弃的“系统”来启动opendiff ?

This line of code:

这行代码:

system("/Applications/Xcode.app/Contents/Developer/usr/bin/opendiff /Users/LukeSkywalker/Documents/doc1.rtf /Users/LukeSkywalker/Documents/doc2.rtf");

gives me this warning:

给我这个警告:

'system' is deprecated: first deprecated in iOS 8.0 - Use posix_spawn APIs instead.

I've read a little bit about posix_spawn, but I can't figure out what an equivalent line of code using posix_spawn would look like.

我已经读了一些关于posix_spawn的内容，但是我不知道使用posix_spawn的代码是什么样子的。

Any help or links to samples would be appreciated.

任何对样品的帮助或链接都会被欣赏。

2 个解决方案

#1

Using posix_spawn(), to answer your question:

使用posix_spawn()来回答您的问题:

#include <spawn.h>
extern char **environ;

(...)

(…)

pid_t pid;
char *argv[] = {
    "/Applications/Xcode.app/Contents/Developer/usr/bin/opendiff",
    "/Users/LukeSkywalker/Documents/doc1.rtf",
    "/Users/LukeSkywalker/Documents/doc2.rtf",
    NULL
};

posix_spawn(&pid, argv[0], NULL, NULL, argv, environ);
waitpid(pid, NULL, 0);

Or, you could use NSTask:

或者，你可以用NSTask:

NSTask *task = [[NSTask alloc] init];
task.launchPath = @"/Applications/Xcode.app/Contents/Developer/usr/bin/opendiff";
task.arguments = [NSArray arrayWithObjects:
                  @"/Users/LukeSkywalker/Documents/doc1.rtf",
                  @"/Users/LukeSkywalker/Documents/doc2.rtf",
                  nil];
[task launch];
[task waitUntilExit];

If you don't need it to be synchronous, just remove the call to waitpid() (make sure to call it somewhere else, or you'll end up with a zombie process until your app exits) or [task waitUntilExit].

如果您不需要它是同步的，那么只需删除waitpid()的调用(确保在其他地方调用它，或者在应用程序退出之前，您将结束一个僵尸进程)或[任务waitUntilExit]。

#2

Swift 3, Xcode 8.3.1

斯威夫特3,Xcode 8.3.1

func system(_ command: String) {
    var args = command.components(separatedBy: " ")
    let path = args.first
    args.remove(at: 0)

    let task = Process()
    task.launchPath = path
    task.arguments = args
    task.launch()
    task.waitUntilExit()
}

#1