Error Lnk2019 Unresolved External Symbol Static
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Error Lnk2019 Unresolved External Symbol Public Static Class
with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack error lnk2019 unresolved external symbol __declspec(dllimport) 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 c++ error lnk2019 unresolved external symbol 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 static public members, so I can group similar functions together that still have to
Error Lnk2019 Unresolved External Symbol Winmain@16 Referenced In Function ___tmaincrtstartup
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; } I'm new to C++ so go easy on me. Why can't I do this? c++ class static members share|improve
Error Lnk2019 Unresolved External Symbol Visual Studio 2010
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 words when it is inappropriate to declare them as const), you can separate you code between .H and .CPP in the following way: .H : class test { public: static unsigned char X; static unsigned char Y; ... test(); };
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Error Lnk2019 Unresolved External Symbol Void __cdecl
policies of this site About Us Learn more about Stack Overflow the company Business Learn more error lnk2019 unresolved external symbol main referenced in function __tmaincrtstartup 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 http://stackoverflow.com/questions/195207/unresolved-external-symbol-on-static-class-members 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 How to solve 'unresolved external symbol' [duplicate] up vote 0 down vote favorite This question already has an answer here: OpenCV Unresolved External Symbols - Other Libraries Needed? http://stackoverflow.com/questions/25156521/how-to-solve-unresolved-external-symbol 7 answers What is an undefined reference/unresolved external symbol error and how do I fix it? 25 answers I want to run the project Objectness, Main.cpp. The code I download from website. I just use C++ again after about 5 years. I have errors 'unresolved external symbol'. I read a related problem 'unresolved external symbol..no idea'. So I found these external symbols are already defined in Objectness.cpp. The exactly error are 1> Touching "x64\Debug\Objectness.unsuccessfulbuild". 1>ClCompile: 1> All outputs are up-to-date. 1>ManifestResourceCompile: 1> All outputs are up-to-date. 1>Objectness.obj : error LNK2019: unresolved external symbol destroy_param referenced in function "public: static class cv::Mat __cdecl Objectness::trainSVM(class cv::Mat const &,class std::vector
here for a quick overview of the site Help Center Detailed http://stackoverflow.com/questions/36419009/how-to-solve-error-lnk2019-unresolved-external-symbol-public 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 error lnk2019 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 How to solve error : LNK2019: unresolved external symbol “public”? up vote -4 down vote favorite I want to make error lnk2019 unresolved 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 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