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我遵循了这个：http ://code.google.com/p/metasyntactic/wiki/ProtocolBuffers

我能够编译 Person.proto 文件

将 .h 和 .m 文件添加到我的静态库项目 (libIOS)

UI 项目引用了 libIOS

现在当我编译时，我在 UI 项目中得到以下错误

    Undefined symbols for architecture i386:
  "_OBJC_CLASS_$_PBExtensionRegistry", referenced from:
      objc-class-ref in libIOS.a(Person.pb.o)
  "_OBJC_CLASS_$_PBGeneratedMessage", referenced from:
      _OBJC_CLASS_$_Person in libIOS.a(Person.pb.o)
  "_OBJC_CLASS_$_PBGeneratedMessage_Builder", referenced from:
      _OBJC_CLASS_$_Person_Builder in libIOS.a(Person.pb.o)
  "_OBJC_CLASS_$_PBMutableExtensionRegistry", referenced from:
      objc-class-ref in libIOS.a(Person.pb.o)
  "_OBJC_CLASS_$_PBUnknownFieldSet", referenced from:
      objc-class-ref in libIOS.a(Person.pb.o)
  "_OBJC_IVAR_$_PBGeneratedMessage.memoizedSerializedSize", referenced from:
      -[Person serializedSize] in libIOS.a(Person.pb.o)
  "_OBJC_METACLASS_$_PBGeneratedMessage", referenced from:
      _OBJC_METACLASS_$_Person in libIOS.a(Person.pb.o)
  "_OBJC_METACLASS_$_PBGeneratedMessage_Builder", referenced from:
      _OBJC_METACLASS_$_Person_Builder in libIOS.a(Person.pb.o)
  "_computeInt32Size", referenced from:
      -[Person serializedSize] in libIOS.a(Person.pb.o)
  "_computeStringSize", referenced from:
      -[Person serializedSize] in libIOS.a(Person.pb.o)
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

项目 libIOS 符合要求，没有错误

项目 UI 给出了上述错误

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