iTunes脚本编写与脚本桥&沙盒 [英] iTunes scripting with Scripting Bridge & Sandboxing

问题描述

我有一个应用程序，它告诉iTunes使用ScriptingBridge框架播放音乐。该应用程序或者告诉iTunes播放播放列表或者某个曲目。

I have an app which tells iTunes to play music using the ScriptingBridge framework. The app either tells iTunes to play a playlist or a certain track. The app is also sandboxed.

要播放播放列表，请按以下步骤操作：

To play a playlist, here's what I have:

iTunesPlaylist* playlist = ...
[playlist playOnce: YES];

要播放曲目，它很简单：

To play a track, it's pretty straightforward as well:

iTunesTrack* track = ...
[track playOnce: YES];

由于我的应用程序是沙盒，我的权利文件中有以下几行：

Since my app is sandboxed, I have the following lines in my entitlements file:

<key>com.apple.security.scripting-targets</key>
<dict>
    <key>com.apple.iTunes</key>
    <array>
        <string>com.apple.iTunes.library.read</string> // I also have this to read the playlists/tracks the user has on his library
        <string>com.apple.iTunes.playback</string>
    </array>
</dict>

我已经测试没有应用程序沙箱和代码工作完美。尽管播放列表代码工作正常，但是播放曲目不会工作。我检查了控制台应用程序，似乎没有记录，涉及sandboxd和我的应用程序。

I have tested without app sandboxing and the code works perfectly. With sandboxing though the playlist code works fine, but playing a track does not work. I checked with the Console app and nothing seems to be logged that concerns sandboxd and my app.

一开始我想我可能会缺少一些 access-group 在我的权限文件，但是我认为这将没有意义，因为我已经有播放一个。我没有找到任何列表的访问组在iTunes上的网络（我甚至试图使用sdef从iTunes获取属性列表，搜索'access-group'，但没有发现 - 它不存在），所以我不能

At first I thought that I might be missing some access-group in my entitlements file, but then I thought that wouldn't make sense because I already have the playback one. And I couldn't find any list of access groups for iTunes on the net (I even tried using sdef to get a property list from iTunes and search for 'access-group' but found nothing - it's not there) so I couldn't confirm if I needed any more.

总而言之，为什么沙箱会阻止这项工作？

To sum up, why is sandbox preventing this from working?

推荐答案

没关系。原来，我在 SBElementArray 上调用 filteredArrayUsingPredicate：找出我想播放的曲目， >不知何故正在搞乱。现在我使用方法 objectWithName：，它工作。

Never mind. It turns out I was calling filteredArrayUsingPredicate: on an SBElementArray to find out the track I wanted to play and that somehow was messing things up. Now I use the method objectWithName: and it works.

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