请教各位先进 小弟最近参考网路上的写法，写了一个读iPod library的小程式。 主要是想拨放iPod library里面的声音档。 但是执行後出现以下错误... 显示Unable to launch iPod music player server...是不是代表模拟器不能 模拟抓取iPod Library的资料？ 因为我想想也对，模拟器里面根本没有同步载入iPod Library怎麽可能读得到... 本来猜想模拟器会自动有辨法连到桌机上的iPod Library取资料给iPhone AP来读~~ 所以，结论是不是模拟器做不到？而要实机？...谢谢 [Session started at 2011-05-26 21:40:38 +0800.] 2011-05-26 21:40:40.799 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:41.302 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:41.803 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:42.304 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:42.805 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:43.307 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:43.808 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:44.310 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:44.811 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:45.312 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:45.814 MusicPlayer[635:207] MPMusicPlayer: Unable to launch iPod music player server: application not found 2011-05-26 21:40:45.814 MusicPlayer[635:207] MediaPlayer: Message playbackState timed out. 2011-05-26 21:41:03.080 MusicPlayer[635:207] MPMediaPickerController: Unable to access iPod library. 2011-05-26 21:41:03.083 MusicPlayer[635:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present a nil modal view controller on target <MusicPlayerViewController: 0x5652bb0>.' *** Call stack at first throw: ( 0 CoreFoundation 0x00f5bbe9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x010b05c2 objc_exception_throw + 47 2 UIKit 0x0036b021 -[UIViewController presentModalViewController:withTransition:] + 750 3 MusicPlayer 0x000029ec -[MusicPlayerViewController openMediaPicker:] + 175 4 UIKit 0x002b9a6e -[UIApplication sendAction:to:from:forEvent:] + 119 5 UIKit 0x003481b5 -[UIControl sendAction:to:forEvent:] + 67 6 UIKit 0x0034a647 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 7 UIKit 0x003491f4 -[UIControl touchesEnded:withEvent:] + 458 8 UIKit 0x002de0d1 -[UIWindow _sendTouchesForEvent:] + 567 9 UIKit 0x002bf37a -[UIApplication sendEvent:] + 447 10 UIKit 0x002c4732 _UIApplicationHandleEvent + 7576 11 GraphicsServices 0x01891a36 PurpleEventCallback + 1550 12 CoreFoundation 0x00f3d064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 13 CoreFoundation 0x00e9d6f7 __CFRunLoopDoSource1 + 215 14 CoreFoundation 0x00e9a983 __CFRunLoopRun + 979 15 CoreFoundation 0x00e9a240 CFRunLoopRunSpecific + 208 16 CoreFoundation 0x00e9a161 CFRunLoopRunInMode + 97 17 GraphicsServices 0x01890268 GSEventRunModal + 217 18 GraphicsServices 0x0189032d GSEventRun + 115 19 UIKit 0x002c842e UIApplicationMain + 1160 20 MusicPlayer 0x00001b90 main + 102 21 MusicPlayer 0x00001b21 start + 53 22 ??? 0x00000001 0x0 + 1 ) terminate called after throwing an instance of 'NSException' --

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