ios - GCKMediaControlChannel 错误处理

Question

在 50% 的情况下尝试在 chromecast 设备上流式传输音频/视频时，我得到 mediaControlChannel:requestDidFailWithID:error: 方法调用了大约 100 次 BEChromeCastMediaItem 在它实际开始流式传输之前就好了。

Error Domain=com.google.GCKError Code=4 "The operation couldn’t be completed. (com.google.GCKError error 4.)

(实际上，我一直在电视上看到一条“蓝色进度线”，我一直在收到客户端中出现此错误的回调)

遇到这种情况怎么办？通常当您收到有关错误的通知时，您应该处理它(即让用户知道某些事情失败了)并且由您决定是否要重试，但看起来 chrome cast 会为您决定并自动重试直到成功。那么对 iOS 客户端的期望是什么？我们应该忽略这些电话吗？

更新:错误代码似乎发生了变化(我也得到了 1、93)，但它们对于一个媒体项目来说总是相同的。任何人都知道在哪里查找错误代码？ Class chrome.cast.Error没有这方面的任何信息。

Answer 1

这里有一些说明: https://developers.google.com/cast/docs/reference/ios/g_c_k_error_8h#aea7a716be62f301015e255e1ba63a9cc

您提到的错误代码 4 看起来意味着发出了无效请求。

如果你恰好是iOS编程，在GCKError.h文件中，我发现有一些额外的错误代码:

  typedef NS_ENUM(NSInteger, GCKErrorCode) {

  /**
   * Error code indicating a network I/O error.
   */
  GCKErrorCodeNetworkError = 1,

  /**
   * Error code indicating that an operation has timed out.
   */
  GCKErrorCodeTimeout = 2,

  /**
   * Error code indicating an authentication error.
   */
  GCKErrorCodeDeviceAuthenticationFailure = 3,

  /**
   * Error code indicating that an invalid request was made.
   */
  GCKErrorCodeInvalidRequest = 4,

  /**
   * Error code indicating that an in-progress request has been cancelled, most likely because
   * another action has preempted it.
   */
  GCKErrorCodeCancelled = 5,

  /**
   * Error code indicating that the request was disallowed and could not be completed.
   */
  GCKErrorCodeNotAllowed = 6,

  /**
   * Error code indicating that a requested application could not be found.
   */
  GCKErrorCodeApplicationNotFound = 7,

  /**
   * Error code indicating that a requested application is not currently running.
   */
  GCKErrorCodeApplicationNotRunning = 8,

  /**
   * Error code indicating the app entered the background.
   */
  GCKErrorCodeAppDidEnterBackground = 91,

  /**
   * Error code indicating a disconnection occurred during the request.
   */
  GCKErrorCodeDisconnected = 92,

  /**
   * Error code indicating that a request could not be made because the same type of request is
   * still in process.
   */
  GCKErrorCodeDuplicateRequest = 93,

  /**
   * Error code indicating that a media load failed on the receiver side.
   */
  GCKErrorCodeMediaLoadFailed = 94,

  /**
   * Error code indicating that a media media command failed because of the media player state.
   */
  GCKErrorCodeInvalidMediaPlayerState = 95,

  /**
   * Error code indicating that the application session ID was not valid.
   */
  GCKErrorCodeInvalidApplicationSessionID = 96,

  /**
   * Error code indicating that an unknown, unexpected error has occurred.
   */
  GCKErrorCodeUnknown = 99,
};