我在编写音频文件的元数据时遇到困难:AudioFileIDfileID=nil;AudioFileOpenURL((__bridgeCFURLRef)url,kAudioFileReadWritePermission,0,&fileID);CFDictionaryRefpiDict=nil;UInt32piDataSize=sizeof(piDict);AudioFileGetProperty(fileID,kAudioFilePropertyInfoDictionary,&piDataSize,&piDict);NSLog(@"%@",(__bridgeNSDictionary*)p