標準庫在ios上運用問題

轉載請註明原創地址:http://blog.csdn.net/iflychenyang/article/details/8564679

用C++寫出來的程式碼在ios上編譯成lib，然後整合到其他工程中，會出現類似以下的錯誤資訊：

Undefined symbols for architecture i386:

  "YANGCHEN::CoreSetting::setChannel(std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced from:

      -[BlcObject initWithAid:theChannel:theServerURL:theLogURL:theRelativePath:] in BlcObject.o

  "std::istream::gcount() const", referenced from:

      Poco::XML::ParserEngine::readChars(std::istream&, char*, int) in libPocoXML.a(ParserEngine.o)

      Poco::XML::ParserEngine::readBytes(std::istream&, char*, int) in libPocoXML.a(ParserEngine.o)

  "std::string::end() const", referenced from:

      int Poco::icompare<std::string>(std::string const&, std::string const&) in libPocoNet.a(HTTPMessage.o)

      Poco::Net::HTTPRequest::getCredentials(std::string const&, std::string&, std::string&) const in libPocoNet.a(HTTPRequest.o)

      Poco::Net::HTTPRequest::getCookies(Poco::Net::NameValueCollection&) const in libPocoNet.a(HTTPRequest.o)

      int Poco::icompare<std::string>(std::string const&, std::string const&) in libPocoNet.a(HTTPRequest.o)

      Poco::Net::HTTPResponse::getCookies(std::vector<Poco::Net::HTTPCookie, std::allocator<Poco::Net::HTTPCookie> >&) const in libPocoNet.a(HTTPResponse.o)

      int Poco::icompare<std::string>(std::string const&, std::string const&) in libPocoNet.a(HTTPResponse.o)

      Poco::URI::getPathSegments(std::string const&, std::vector<std::string, std::allocator<std::string> >&) in libPocoFoundation.a(URI.o)

解決方法：

In main project -> Build Settings scroll and find out the options, C++ Language Dialect and C++ Standard Library. Select options "Compiler Default" for both of them. (This is the step I missed, It is needed because newest XCode template has compiler default settings different to what they were in older versions).

參考：

http://stackoverflow.com/questions/12968369/undefined-symbols-for-architecture-armv7-when-using-zxing-library-in-xcode-4-5