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Questions tagged [lnk2019]

LNK2019 is a common MSVC linker error indicating that the linker was unable to find a required external symbol in any compilation unit. Check the SO post on common errors and their resolution.

LNK2019 is a common MSVC linker error indicating that the linker was unable to find a required external symbol in any compilation unit. A possible and common cause of the error is a symbol that is declared but never defined.

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"unresolved external symbol" when including a single-header library

When I try to include any single-header library in my project (here I am using HTTPRequest), it keeps giving me the LNK2019 error. This is my code: #include "HTTPRequest.hpp" void main() { http::Request request{ "http://test.com/test" }; …
Mlemix
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Visual Studio throwing LNK2019 and solution missing headers/source files

-- Updates -- Adding the source file settings.cpp directly to the project via Add -> Existing Item resolved the LNK2019 (as I suspected it couldnt find it). -- Updated Question-- How to specify a source file directory without having to add all…
pstatix
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LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void) for C program

Main Error: Error LNK2019 unresolved external symbol _main referenced in function "int __cdecl invoke_main(void)" (?invoke_main@@YAHXZ) I have read so many different ones and tried it all with no luck. Could someone help please? I am not a dev, so…
Centadmin
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LNK2019 error; what is missing/not defined here?

When I try to build out my progam I get this error: error LNK2019: unresolved external symbol "bool __cdecl TextGame::spaceVoid(struct TextGame::Position const &,struct TextGame::RoomData const &)"…
Michael Fremaux
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LNK2019 Error with nested class in C++

I am new to C++, so I am sorry if this a simple or obvious error. I have been reading a lot other questions and the documentation, but I haven't been able to find a solution yet. I am trying to add a new class definition to a large existing project.…
Sarah
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Unresolved External Symbol with COM

I'm writing a small class to interface with reading excel files through COM. So far all is ok, except when I attempt to read a cell's value. During testing I was initially calling getCell() from the constructor just to check it was working and all…
APCrowder
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Several links errors in my project: LNK2019, LNK2005

I tried every solution for those errors in google, but found no answer for this problem. The project is really big, but here is one of the files: cpp file: #include"Cluster.h" Cluster::Cluster() {} Cluster::~Cluster() //close files and reomve…
Almog Nahum
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LNK 2019- microsoft visual studdio

Hello I keep running into a recurring error. I managed to successfully link to the SDL library and my code was compiling with no problems, I then used the same procedure to link to an openGL(GLEW) library to use simultaneously with my project. The…
Kyle Rogers
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LNK2019 in class declaration and definition

I know there are several questions on this. I have checked the MSDN page for LNK2019 error but I can not seem to specify why this error appeared. This is my declaration file: #ifndef _COLLEGE_H_ #define…
fatg
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CPP error LNK2019: unresolved external symbol cpp

Error 1 error LNK2019: unresolved external symbol "public: void __thiscall Sounds::soundBox(void)" (?soundBox@Sounds@@QAEXXZ) referenced in function _main For some reason i get this error, and i rly dont know what i did wrong. Got wimm.lib…
Mefiq
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What is causing this LNK2019 Unresolved external symbol error?

I've been trying to figure out how to fix this, but I simply cannot see what is wrong. The error message(s) are as follows; error LNK2019: unresolved external symbol "public:_thiscall Circle::Circle(coid)" (??0Circle@@QAE@XZ) reference in function…
NeoKuro
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Error LNK2019 while implementing a constructor

I am having some trouble with the implementation of a constructor and I cannot figure out what is the problem. I have spent a lot of time with this problem: it would be grateful some kind of advice. The main code is: #include "stdafx.h" #include…
David Duran
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error LNK2019: unresolved external symbol/

I'm having a lot of trouble trying to compile an ogre sample found on Github. I've had several Intellisense errors, compilation & linking errors. Now I'm stuck with 2 linker errors. I know there's a lot of similar questions around here because I've…
Georges S.
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Unresolved external symbol LINK 2019

I have a class declared in a .cpp file, and the structure written in a .h file, in order to use the class in other .cpp files Example : //class1.cpp //class1.h class class1 class class1 { …
Galax27
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error LNK2019: unresolved external symbol "public: void__thiscall Start::showMenu(void)"

Im building a c++ program and i am recieving this error. I am also receiving 2 more errors for similar things. I understand that this is normally due to not linking a library or something of that natrue, but im not currently using a library?…
mwild
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