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我正在尝试在我的应用程序上使用 socket.io，并且我正在使用 pkyeck socket.io 实现。但是，当我从 pkyeck socket.io 导入文件和从 socketrocket 导入文件时，我收到 21 个 Apple mach-O 链接错误，我不知道它是什么意思或指的是什么。

Undefined symbols for architecture i386:
  "_CFHTTPMessageAppendBytes", referenced from:
      ___30-[SRWebSocket _readHTTPHeader]_block_invoke in SRWebSocket.o
  "_CFHTTPMessageCopyAllHeaderFields", referenced from:
      ___30-[SRWebSocket _readHTTPHeader]_block_invoke in SRWebSocket.o
  "_CFHTTPMessageCopyHeaderFieldValue", referenced from:
      -[SRWebSocket _checkHandshake:] in SRWebSocket.o
      -[SRWebSocket _HTTPHeadersDidFinish] in SRWebSocket.o
  "_CFHTTPMessageCopySerializedMessage", referenced from:
      -[SRWebSocket didConnect] in SRWebSocket.o
  "_CFHTTPMessageCreateEmpty", referenced from:
      -[SRWebSocket _readHTTPHeader] in SRWebSocket.o
  "_CFHTTPMessageCreateRequest", referenced from:
      -[SRWebSocket didConnect] in SRWebSocket.o
  "_CFHTTPMessageGetResponseStatusCode", referenced from:
      -[SRWebSocket _HTTPHeadersDidFinish] in SRWebSocket.o
  "_CFHTTPMessageIsHeaderComplete", referenced from:
      ___30-[SRWebSocket _readHTTPHeader]_block_invoke in SRWebSocket.o
  "_CFHTTPMessageSetHeaderFieldValue", referenced from:
      -[SRWebSocket didConnect] in SRWebSocket.o
      ___25-[SRWebSocket didConnect]_block_invoke in SRWebSocket.o
  "_SecCertificateCopyData", referenced from:
      -[SRWebSocket stream:handleEvent:] in SRWebSocket.o
  "_SecRandomCopyBytes", referenced from:
      -[SRWebSocket didConnect] in SRWebSocket.o
      -[SRWebSocket _sendFrameWithOpcode:data:] in SRWebSocket.o
  "_SecTrustGetCertificateAtIndex", referenced from:
      -[SRWebSocket stream:handleEvent:] in SRWebSocket.o
  "_SecTrustGetCertificateCount", referenced from:
      -[SRWebSocket stream:handleEvent:] in SRWebSocket.o
  "_kCFHTTPVersion1_1", referenced from:
      -[SRWebSocket didConnect] in SRWebSocket.o
  "_kCFStreamPropertySSLPeerTrust", referenced from:
      -[SRWebSocket stream:handleEvent:] in SRWebSocket.o
  "_kCFStreamPropertySSLSettings", referenced from:
      -[SRWebSocket _initializeStreams] in SRWebSocket.o
  "_kCFStreamSSLValidatesCertificateChain", referenced from:
      -[SRWebSocket _initializeStreams] in SRWebSocket.o
  "_kSecRandomDefault", referenced from:
      -[SRWebSocket didConnect] in SRWebSocket.o
      -[SRWebSocket _sendFrameWithOpcode:data:] in SRWebSocket.o
  "_utf8_countTrailBytes", referenced from:
      _validate_dispatch_data_partial_string in SRWebSocket.o
  "_utf8_nextCharSafeBody", referenced from:
      _validate_dispatch_data_partial_string in SRWebSocket.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

我真的不知道为什么要得到它们，因为我所做的只是将文件导入项目。

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