objective-c – 使用ScriptingBridge获取当前歌曲的iTunes图稿

我一直试图弄清楚如何使用脚本桥获取当前正在播放的歌曲的iTunes艺术作品.我已经达到了适用于某些歌曲的程度,但对于其他歌曲,我得到了一个SIGABRT.我不确定问题是什么,所以任何帮助都将不胜感激.这是我到目前为止：

iTunesApplication * iTunes = [SBApplication applicationWithBundleIdentifier:@"com.apple.iTunes"];
NSImage *songArtwork;
iTunesTrack *current = [iTunes currentTrack];
iTunesArtwork *artwork = (iTunesArtwork *)[[[current artworks] get] lastObject];
if(artwork != nil)
  songArtwork = [artwork data];
else
  songArtwork = [NSImage imageNamed:@"Image.tiff"];

NSMenuItem *artworkMenuItem = [[NSMenuItem alloc] initWithTitle:@"" action:NULL keyEquivalent:@""];
[songArtwork setSize:NSMakeSize(128,128)];
[artworkMenuItem setimage:songArtwork];
[Menu insertItem:artworkMenuItem atIndex:0];

我可以使用一些歌曲,并在菜单项中很好地显示艺术作品,但对于其他人我在线上获得了一个SIGABRT：

[songArtwork setSize:NSMakeSize(128,128)];

控制台的输出如下：

2011-08-12 23:13:20.094 SongViewer[2146:707] -[NSAppleEventDescriptor setSize:]:     unrecognized selector sent to instance 0x102827f70
2011-08-12 23:13:20.095 SongViewer[2146:707] An uncaught exception was raised
2011-08-12 23:13:20.096 SongViewer[2146:707] -[NSAppleEventDescriptor setSize:]: unrecognized selector sent to instance 0x102827f70
2011-08-12 23:13:20.097 SongViewer[2146:707] (
0   CoreFoundation                      0x00007fff86f11986 __exceptionPreprocess + 198
1   libobjc.A.dylib                     0x00007fff8b04cd5e objc_exception_throw + 43
2   CoreFoundation                      0x00007fff86f9d5ae -[NSObject doesNotRecognizeSelector:] + 190
3   CoreFoundation                      0x00007fff86efe803 ___forwarding___ + 371
4   CoreFoundation                      0x00007fff86efe618 _CF_forwarding_prep_0 + 232
5   SongViewer                          0x0000000100002a83 -[IPMenulet awakeFromNib] + 4483
6   CoreFoundation                      0x00007fff86f089e1 -[NSObject performSelector:] + 49
7   CoreFoundation                      0x00007fff86f08962 -[NSSet makeObjectsPerformSelector:] + 274
8   AppKit                              0x00007fff8d9d9c27 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1245
9   AppKit                              0x00007fff8d9d01b9 loadNib + 322
10  AppKit                              0x00007fff8d9cf6b6 +[NSBundle(NSNibLoading) _loadNibFile:naMetable:withZone:ownerBundle:] + 217
11  AppKit                              0x00007fff8d9cf5d1 +[NSBundle(NSNibLoading) loadNibFile:externalNaMetable:withZone:] + 141
12  AppKit                              0x00007fff8d9cf514 +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 364
13  AppKit                              0x00007fff8dc42355 NSApplicationMain + 398
14  SongViewer                          0x0000000100001882 main + 34
15  SongViewer                          0x0000000100001854 start + 52
)
2011-08-12 23:13:20.098 SongViewer[2146:707] *** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[NSAppleEventDescriptor setSize:]: unrecognized selector sent to instance 0x102827f70'
*** First throw call stack:
(
0   CoreFoundation                      0x00007fff86f11986 __exceptionPreprocess + 198
1   libobjc.A.dylib                     0x00007fff8b04cd5e objc_exception_throw + 43
2   CoreFoundation                      0x00007fff86f9d5ae -[NSObject doesNotRecognizeSelector:] + 190
3   CoreFoundation                      0x00007fff86efe803 ___forwarding___ + 371
4   CoreFoundation                      0x00007fff86efe618 _CF_forwarding_prep_0 + 232
5   SongViewer                          0x0000000100002a83 -[IPMenulet awakeFromNib] + 4483
6   CoreFoundation                      0x00007fff86f089e1 -[NSObject performSelector:] + 49
7   CoreFoundation                      0x00007fff86f08962 -[NSSet makeObjectsPerformSelector:] + 274
8   AppKit                              0x00007fff8d9d9c27 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1245
9   AppKit                              0x00007fff8d9d01b9 loadNib + 322
10  AppKit                              0x00007fff8d9cf6b6 +[NSBundle(NSNibLoading) _loadNibFile:naMetable:withZone:ownerBundle:] + 217
11  AppKit                              0x00007fff8d9cf5d1 +[NSBundle(NSNibLoading) loadNibFile:externalNaMetable:withZone:] + 141
12  AppKit                              0x00007fff8d9cf514 +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 364
13  AppKit                              0x00007fff8dc42355 NSApplicationMain + 398
14  SongViewer                          0x0000000100001882 main + 34
15  SongViewer                          0x0000000100001854 start + 52
)
terminate called throwing an exception(gdb)

如果有人知道可能出现什么问题,请告诉我！

解决方法

好的,我明白了.解决方案是使用API​​提供的NSData原始数据而不是NSImage.所以我用过：

NSImage *songArtwork = [[NSImage alloc] initWithData:[artwork rawData]];

而不是

songArtwork = [artwork data];