获取ipod中的音乐文件格式

-(void *)getIpodMusicFormatWithIn

dex: (NSInteger)index{
    MPMediaItem * item = [itemsArray objectAtIndex: index];
    NSURL *url = [item valueForProperty: MPMediaItemPropertyAssetURL];
    NSString *str =[url absoluteString];
    NSRange temp1 =  [str rangeOfString:@"."];
    NSRange temp2 =  [str rangeOfString:@"?"];
    NSRange temp ;
    temp.length = temp2.location - temp1.location-1;
    temp.location = temp1.location + 1;
    NSString *finalSrt = [str substringWithRange:temp];
    DMLog *LogData = [DMLog sharedLogData];
    if (finalSrt == nil) {
        finalSrt = @"";
    }
    [LogData.sonyPlayDict setValue:finalSrt forKey:@"IpodMusicFormat"];
}
详细的解释说不出来。自己一半懂不懂，反正是实现了。先记下来慢慢研究。。