Question

我按照http://mongodb.github.io/mongo-scala-driver/的说明安装了scala 2.11。但我的第一堂课无法参加。

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioPlayerDelegate, 
AVAudioRecorderDelegate {


    var audioPlayer: AVAudioPlayer?
    var audioRecorder: AVAudioRecorder?

    @IBOutlet weak var recordAudio: UIButton!
    @IBOutlet weak var stopAudio: UIButton!
    @IBOutlet weak var playAudio: UIButton!

    var arrayData: [FileManager] = []

    override func viewDidLoad() {
        super.viewDidLoad()

     playAudio.isEnabled = false
    stopAudio.isEnabled = false

    // Creating File Manager

        let fileMgr = FileManager.default

        let dirPath = fileMgr.urls(for: .documentDirectory, in: .userDomainMask)
        let soundFileUrl = dirPath[0].appendingPathComponent("sound.caf")

        let recordSettings = [AVEncoderAudioQualityKey: AVAudioQuality.min.rawValue,
                              AVEncoderBitRateKey: 16,
                              AVNumberOfChannelsKey: 2,
                              AVSampleRateKey: 44100.0 ] as [String:Any]

        let audioSession = AVAudioSession.sharedInstance()

        do {
                try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)

        } catch {

                   print(error.localizedDescription)

        }

        do {
                try audioRecorder = AVAudioRecorder(url: soundFileUrl, settings: recordSettings as [String : Any])

        audioRecorder?.prepareToRecord()

        } catch {

            print(error.localizedDescription)
        }
}

    @IBAction func recordButton(_ sender: Any) {

        if audioRecorder?.isRecording == false {

        playAudio.isEnabled = false
        stopAudio.isEnabled = true
        audioRecorder?.record()
  }

    }

    @IBAction func stopButton(_ sender: Any) {

        stopAudio.isEnabled = false
        playAudio.isEnabled = true
        recordAudio.isEnabled = true

        if audioRecorder?.isRecording == true{

            audioRecorder?.stop()

        }  else {

                audioPlayer?.stop()

        }

}

@IBAction func playButton(_ sender: Any) {

    if audioRecorder?.isRecording == false{

        stopAudio.isEnabled = true
        recordAudio.isEnabled = true

        do {
                try audioPlayer = AVAudioPlayer(contentsOf: (audioRecorder?.url)!)

            audioPlayer!.delegate = self
            audioPlayer!.prepareToPlay()
            audioPlayer!.play()

        } catch {

                print(error.localizedDescription)

        }
    }
}

func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
    recordAudio.isEnabled = true
    stopAudio.isEnabled = false
}

func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {
    print("Audio Player Error")
}

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {

}

func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
        print("Audio Recorder Error")
}

例外：

def main(args: Array[String]): Unit = {
   val mongoClient: MongoClient = if (args.isEmpty) MongoClient() else MongoClient("mongodb://localhost")
}

Answer 1

我遇到了同样的问题，这是由于对底层Java驱动程序的错误依赖。 Mongo Spark连接器依赖于Java驱动程序的3.2.2版本，显然Scala驱动程序也使用了该驱动程序。我通过在sbt：

中定义依赖关系解决了这个问题

val mongoScalaDriver = "org.mongodb.scala" %% "mongo-scala-driver" % "2.1.0"
  val mongoJavaDriver = "org.mongodb" % "mongo-java-driver" % "3.4.2"
  val mongoSpark = Seq(mongoScalaDriver, mongoJavaDriver, "org.mongodb.spark" %% "mongo-spark-connector" % "2.0.0")

我在我的图书馆项目中使用了mongoSpark。另外，我明确地添加了对Java驱动程序版本3.4.2的依赖。

Answer 2

我终于通过build.sbt中的一行来修复了这个问题：

<script src="https://unpkg.com/vue@2.4.2/dist/vue.min.js"></script>
<div id="app">
  <transition name="highlight" mode="out-in">
    <h1 :key="rank">Current Rank: <strong>{{ rank }}</strong></h1>
  </transition>
  <p>Your XP: <strong>{{ xp }}</strong></p>
  <button @click="increase">+ 10 XP</button>
  <button @click="decrease">- 10 XP</button>
</div>

使用mongo-scala-driver 2.1.0运行我的第一个MongoClient scala代码时出错

2 个答案: