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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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Getting linker errors

I wrote this program using the guidelines set by my instructor. Once I finally fixed all my typos and syntax errors I tried to compile the program and revived 5 linker errors. As far as I can tell there is absolutely nothing wrong with the program,…
William Lovejoy
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LNK2019 When trying to inherit a class

So, I'm trying to inherit a class from another. I have the base class Entity and I have a Hero class that needs to be inherited from it. Like usual, I do this like this: #include "Entity.h" class Hero : public Entity { public: Hero(Sprite*…
Michiel Magendans
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Unresolved external symbol on basic function

Build error LNK2019 happens when building project with 1 cpp file namespace foo { __declspec(dllimport) void Print(); } void main() { foo::Print(); } foo is defined. header (in other folder): #pragma once namespace foo { …
mmd
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Can't import all class from dynamic library (dll) C++

I have two class that I want to import from a dynamic library. One off then work just fine. I can use the first one without any linking error, but the second one create an linking 2019 code error. I have no idea about what I'm doing wrong with the…
J3hud
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unresolved external symbols using fltk 1.4.0 and vs 2022

I've been trying to use FLTK to create a chess program gui, but I can't seem to get the example code they provide on their website to work. #include #include #include int main(int argc, char** argv) { …
esdv123
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Libssh2 do not compile in C++

Is exist any guide for libssh2 C++? I have no any idea why the lnk2019 apears when i try to use any function from libssh2 but i linked this library and included in code. #include #include #include…
mAlware_w0lf
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Visual Studio Assembly: Strange Error with Unresolved Externals, Possibly Linker?

I am in a college class where I am learning assembly, and I have spent half the semester fighting with Visual Studio to allow me to write and successfully build a program. Lately, I have been getting an error that I have not seen anywhere else on…
TheRichinator
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Linking issue of ImGui into an existing project(LNK2019)

I was working an existing opengl project. I wanted to add ImGui to the project and I followed the process as mentioned by adding all the files into the project and including the main headers into the basic.cc(my main file). But on running the…
Samir Kumar Patro
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winmain@16 error occurs in vscode environment

I'm using the msvc compiler to create windows. A link error is occurring, but the problem is difficult to solve because I am not familiar with vscode. #include #pragma comment(linker, "/entry:wWinMainCRTStartup…
backpack
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LNK2019 unresolved external symbols when compiling using libxml2 in microsoft visual studio

built libxml2 using cscript, added the include path in Properties->C/C++->Additional include directories and the path to libxml2_a.lib in Properties->linker->Additional dependencies. Are there any macro definitions to add if libxml2 is linked…
steve89
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VS2022 C++ change configuration type based on startup project?

Is it possible to update a project to change from exe to lib depending on if it is set as the startup project? ie: Project: Foo Project: Foo-Unit-tests using the Pimpl idiom I'm getting link errors if foo is an .exe. Changing it to .lib resolves…
jc.021286
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"LNK2019 error: unresolved external symbol..." in Visual Studio 2019 when installing the library intel-mkl

I have the following problem. There is a need to install the mkl library (from there you need mainly lapack and blas to work with matrices and linear algebra). In fact, it does not matter that all this works in Visual Studio, if you can tell me…
Booch
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I'm having trouble with this code. It gives me LNK 2019 and LNK 1120 errors, with C4551 error

I mainly am trying to create a simple window to a game but can't figure out where I'm going wrong or what I need to delete. From looking around there was on one answer that I could possibly pin point what may be going wrong but I am still fairly new…
Sam mathis
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Visual Studio 2022 - How to add external header and source file to C project?

In Visual Studio 2022, for Project A I want to set up Project B that references the header (.h) and source (.cpp) files of Project A (reusing existing code). However, I don't know how the point to the existing files correctly in order for Project B…
CodeSocke
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How to solve LNK2019 and LNK 1120 from this code?

When I try to compile this code, Visual Studio 2022 shows these problems. > `Severity Code Description Project File Line Suppression State > Error LNK2019 unresolved external symbol "public: void __cdecl cashregister::acceptamount(int)"…
MaunaKea
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