iOS 江湖救急！！！怎样将音频文件上传到服务器

http上传 把文件以body形式上传到服务器 NSFileHandle* handler = [NSFileHandle fileHandleForReadingAtPath:_fileURL]

[handler seekToFileOffset:(unsigned long long)_range.location]

NSData* body = [handler readDataOfLength:_range.length]

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:url]]

[request setHTTPMethod:@"POST"]

[request setValue:@"video/mp4" forHTTPHeaderField:@"Content-Type"]

[request setValue:[NSString stringWithFormat:@"%d",body.length] forHTTPHeaderField:@"Content-Length"]

[request setValue:@"no-cache" forHTTPHeaderField:@"Cache-Control"]

[request setHTTPBody:body]

然后服务器接收body 二进制流

错误提示是什么呢？？？？

//播放文件

AVAudioPlayer *audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL: [NSURL fileURLWithPath:filePath] error: &playerError]

最后一个参数写的不对唉

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