Error 1 Error Lnk2019 Unresolved External Symbol Public Static Class
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Error Lnk2019 Unresolved External Symbol Public __thiscall Referenced In Function _main
Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, error 1 error lnk2019 unresolved external symbol _cvreleaseimage referenced in function _main helping each other. Join them; it only takes a minute: Sign up Unresolved external symbol on static class members up vote 81 down vote favorite 13 Very simply put: I have a class that consists mostly out of
Error 1 Error Lnk2019 Unresolved External Symbol _main Referenced In Function ___tmaincrtstartup
static public members, so I can group similar functions together that still have to be called from other classes/functions. Anyway, I have defined two static unsigned chars in my class' public scope, when I try to modify these values in the same class' constructor, I am getting an "unresolved external symbol" error at compilation. class test { public: static unsigned char X; static unsigned char Y; ... test(); }; test::test() { X = 1; Y = 2; error 1 error lnk2019 unresolved external symbol winmain@16 } I'm new to C++ so go easy on me. Why can't I do this? c++ class static members share|improve this question edited Jan 12 '09 at 14:47 Mike B 7,240186798 asked Oct 12 '08 at 7:45 Daniel add a comment| 3 Answers 3 active oldest votes up vote 92 down vote accepted You forgot to add the definitions to match your declarations of X and Y unsigned char test::X; unsigned char test::Y; somewhere. You might want to also initialize a static member unsigned char test::X = 4; and again, you do that in the definition (usually in a CXX file) not in the declaration (which is often in a .H file) share|improve this answer answered Oct 12 '08 at 7:49 Colin Jensen 2,1901315 add a comment| up vote 35 down vote Static data members declarations in the class declaration are not definition of them. To define them you should do this in the CPP file to avoid duplicated symbols. The only data you can declare and define is integral static constants. (Values of enums can be used as constant values as well) You might to rewrite you code as: class test { public: const static unsigned char X = 1; const static unsigned char Y = 2; ... test(); }; test::test() { } If you want to have ability to modify you static variables (in other
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Error 1 Error Lnk2019 Unresolved External Symbol Main Referenced In Function __tmaincrtstartup
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Error 1 Error Lnk2019 Unresolved External Symbol Void __cdecl
more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack error 1 error lnk2019 unresolved external symbol int __cdecl Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, http://stackoverflow.com/questions/195207/unresolved-external-symbol-on-static-class-members helping each other. Join them; it only takes a minute: Sign up How to solve error : LNK2019: unresolved external symbol “public”? up vote -4 down vote favorite I want to make a plugin for a software. In order to make the plugin, I should make a .dll file but I have faced many challenges about making http://stackoverflow.com/questions/36419009/how-to-solve-error-lnk2019-unresolved-external-symbol-public it. My system is Windows 7 and I'm using Microsoft Visual Studio 2010 as an IDE. I made a dll project and made two source files, one header file and then I built the solution but I encountered the following errors. Note : before building the solution, I added the path of include and lib directories of the software. 1> Creating library C:\Users\pars\Desktop\example\FEneohookean\Debug\FEneohookean.lib and object C:\Users\pars\Desktop\example\FEneohookean\Debug\FEneohookean.exp 1>dllmain.obj : error LNK2019: unresolved external symbol "public: virtual __thiscall FECoreFactory::~FECoreFactory(void)" (??1FECoreFactory@@UAE@XZ) referenced in function __ 1>dllmain.obj : error LNK2019: unresolved external symbol "public: void __thiscall FECoreKernel::RegisterClass(class FECoreFactory *)" (?RegisterClass@FECoreKernel@@QAEXPAVFECoreFactory@@@Z) referenced in function "public: __thiscall FERegisterClass_T
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow http://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix the company Business Learn more about hiring developers or posting ads with us Stack http://stackoverflow.com/questions/4790751/error-lnk2019-unresolved-external-symbol-public Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up What is an undefined reference/unresolved external symbol error and how do I fix it? up vote 708 down error lnk2019 vote favorite 316 What are undefined reference/unresolved external symbol errors? What are common causes and how to fix/prevent them? Feel free to edit/add your own. c++ linker-error undefined-reference c++-faq unresolved-external share|improve this question edited Aug 4 '14 at 13:33 Arno Duvenhage 805517 asked Sep 24 '12 at 22:27 Luchian Grigore 167k28295455 3 One thing to consider adding is how to deal with "undefined vtable" and "undefined typeinfo" errors in particular (since error lnk2019 unresolved they are less obvious than undefined functions or variables). –Jeremiah Willcock Jul 16 '13 at 18:25 1 I've been marking this question to be a possible dupe of this one. But after going through all of your (brilliant) answers, I can't see this case covered here. I'm aware it's specific about how an IDE sets up the project type and it's linkage dependencies. But that's a such frequently asked question I think it would be worth covered (maybe just with a link to another appropriate dupe) here. If it is already, and I just didn't spot it, forget about this request/comment. –πάντα ῥεῖ Mar 3 '14 at 21:14 @LuchianGrigore 'feel free to add an answer' I preferred to add the relevant link (IMHO) your primary answer, if you'd like to permit. –πάντα ῥεῖ Mar 3 '14 at 22:36 Pretty common mistake is that you define a function as a standalone and forget the class selector (e.g. A::) in your .cpp file: You do this (wrong): void myFunc() { /* do stuff */ } Instead of this (right): void A::myFunc() { /* do stuff */ } –jave.web Mar 11 '15 at 18:45 3 If this happens to you with a Qt signal, you most likely forgot the Q_OBJECT macro. –Manu
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up error LNK2019: unresolved external symbol "public: up vote 3 down vote favorite 2 I am creating an torrent application using libtorrent in VS 2008. I tried the example given in the link http://www.rasterbar.com/products/libtorrent/examples.html BUt it is showing me these error....how to solve them? Linking... main.obj : error LNK2019: unresolved external symbol "public: __thiscall libtorrent::torrent_info::~torrent_info(void)" (??1torrent_info@libtorrent@@QAE@XZ) referenced in function _main main.obj : error LNK2019: unresolved external symbol "public: __thiscall libtorrent::torrent_info::torrent_info(struct libtorrent::lazy_entry const &)" (??0torrent_info@libtorrent@@QAE@ABUlazy_entry@1@@Z) referenced in function _main main.obj : error LNK2019: unresolved external symbol "class std::basic_ostream > & __cdecl libtorrent::operator<<(class std::basic_ostream > &,struct libtorrent::lazy_entry const &)" (??6libtorrent@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@std@@AAV12@ABUlazy_entry@0@@Z) referenced in function _main main.obj : error LNK2019: unresolved external symbol "int __cdecl libtorrent::lazy_bdecode(char const *,char const *,struct libtorrent::lazy_entry &,int)" (?lazy_bdecode@libtorrent@@YAHPBD0AAUlazy_entry@1@H@Z) referenced in function _main main.obj : error LNK2019: unresolved external symbol "public: void __thiscall libtorrent::lazy_entry::clear(void)" (?clear@lazy_entry@libtorrent@@QAEXXZ) referenced in function "public: __thiscall libtorrent::lazy_entry::~lazy_entry(void)" (??1lazy_entry@libtorrent@@QAE@XZ) main.obj : error LNK2019: unresolved external symbol "void __cdecl libtorrent::to_hex(char const *,int,char *)" (?to_hex@libtorrent@@YAXPBDHPAD@Z) referenced i