我在我的应用程序中的步骤，其中一个用户多次听到3个口语数字。
如果我离开这个步骤运行一段时间（为“而”某些未定义的值），我的调试日志显示这个（去除不相关的日志条目）：
2010-03-01 13:44:21.283 iPhoneHearChk[1236:207] AudioFileOpenURL returned 0
(for <file://localhost/var/mobile/Applications/3A28F975-EAD5-4A5B-AFE6-FA1C6EE95732/iPhoneHearChk.app/5b3.ima4>)
2010-03-01 13:44:35.493 iPhoneHearChk[1236:207] AudioFileOpenURL returned 0
(for <file://localhost/var/mobile/Applications/3A28F975-EAD5-4A5B-AFE6-FA1C6EE95732/iPhoneHearChk.app/5b3.ima4>)
2010-03-01 13:45:17.916 iPhoneHearChk[1236:207] AudioFileOpenURL returned 0
(for <file://localhost/var/mobile/Applications/3A28F975-EAD5-4A5B-AFE6-FA1C6EE95732/iPhoneHearChk.app/5b3.ima4>)
2010-03-01 13:47:00.408 iPhoneHearChk[1236:207] AudioFileOpenURL returned -43
(for <file://localhost/var/mobile/Applications/3A28F975-EAD5-4A5B-AFE6-FA1C6EE95732/iPhoneHearChk.app/5b3.ima4>)
从我读过，MacErrors.h定义为-43 fnErr，文件未找到。 但显然该文件不存在，因为我成功之前打开了它。 是什么赋予了？
我怎么打开文件：
NSString *soundFilePath = [[NSBundle mainBundle] pathForResource: name ofType: type];
if (!soundFilePath) { NSLog(@"No path found for sound file %@.%@", name, type); }
NSURL *fileURL = [[NSURL alloc] initFileURLWithPath: soundFilePath];
rc = AudioFileOpenURL((CFURLRef) fileURL, kAudioFileReadPermission, 0, &file);
其中，文件是一个AudioFileID instvar和名称和类型的NSString *参数。
