如何使用posix_spawn替换已弃用的“系统”以在Objective-C中启动opendiff？ [英] How do you use posix_spawn to replace the deprecated 'system' to launch opendiff in Objective-C?

问题描述

这行代码：

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

给我这个警告：

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

我已经阅读了一些关于posix_spawn的内容，但我无法弄清楚等价线是什么使用posix_spawn的代码看起来像。

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.

任何帮助或样本链接都将受到赞赏。

Any help or links to samples would be appreciated.

推荐答案

使用 posix_spawn（），回答你的问题：

#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);

或者，您可以使用NSTask：

Or, you could use 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];

如果您不需要同步，只需删除对 waitpid（）（确保在其他地方调用它，或者你的应用程序退出之前你最终会使用僵尸进程）或 [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].

这篇关于如何使用posix_spawn替换已弃用的“系统”以在Objective-C中启动opendiff？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！