接收错误域= kCFErrorDomainCFNetwork当尝试从ReadStream读取时，代码= 2 [英] Receiving Error Domain=kCFErrorDomainCFNetwork Code=2 when attempting to read from ReadStream

问题描述

我正在尝试从 CFStreamCreatePairWithSocketToHost 创建的 CFReadStream 对象同步读取。流打开正常，但是当我尝试在循环中调用 CFReadStreamRead 时，CFReadStreamRead（）返回-1，结果错误是：

错误域= kCFErrorDomainCFNetwork代码= 2无法完成操作（kCFErrorDomainCFNetwork错误2.）UserInfo = 0x14a920 {kCFGetAddrInfoFailureKey = 8}

我在使用这个ReadStream时也收到同样的错误 - 我收到的第一个回调是这个错误。

解决方案

简短的故事：可能是DNS解析失败。

文档说流不打开连接到指定的主机，直到打开其中一个流，并为kCFGetAddrInfoFailureKey

查询此键返回最后一个返回的错误代码getaddrinfo（3）以响应DNS查找。要解释结果，请查找/usr/include/netdb.h中的错误代码。

netdb.h说

  #define EAI_NONAME 8 / * hostname没有提供或不知道* / 
  pre> 
I'm attempting to synchronously read from a CFReadStream objected created by CFStreamCreatePairWithSocketToHost. The stream opened fine but when I attempt to invoke CFReadStreamRead on it in a loop, CFReadStreamRead() returns -1 and the resulting error is: 

Error Domain=kCFErrorDomainCFNetwork Code=2 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error 2.)" UserInfo=0x14a920 {kCFGetAddrInfoFailureKey=8}

I'm also receiving this same exact error when using this ReadStream asynchronously- the first callback I receive is this error.
解决方案
The short story: Probably a DNS resolution failure.

The docs say "The streams do not open a connection to the specified host until one of the streams is opened", and for kCFGetAddrInfoFailureKey,

  
Querying this key returns the last error code returned by getaddrinfo(3) in response to a DNS lookup. To interpret the results, look up the error code in /usr/include/netdb.h.
netdb.h says
#define EAI_NONAME  8  /* hostname nor servname provided, or not known */


                        
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