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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 (LNK2019) when using extern c while testing c file using gtest

I am trying to test c code using gtest (with visual studio). I have two projects under the same solution: a C project and a gtest project using c++. The code is attached below: source.c #include "source.h" int fun(int x) { return x + 1; } int…
user2740785
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Visual Fortran Linker error obsolete _imp

I get the following linker error: 1>------ Build started: Project: Console1, Configuration: Debug Win32 ------ 1>Compiling with Intel(R) Visual Fortran Compiler 18.0.2.185 [IA-32]... 1>Console1.f90 1>Linking... 1>Console1.obj : error LNK2019:…
ora
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I get a LNK2019 Error in 'Hello World' program

I have just started an online course on C++ using MS Visual Studio 2019 community Edition Here's the program: // Program 1_1 // Our first program! #include using namespace std; int main() { cout << "Hello, World!" <<…
Richard JB
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Error LNK2019 in cpp file while csv file is attached to the file

Severity Code Description Project File Line Suppression State Error LNK2019 unresolved external symbol "bool __cdecl readCSVtovector(class std::basic_string,class std::allocator >,class…
Humdan Khan
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LNK2019 unresolved external symbol using my static function defined in a Header File

I have already seen a lot of questions about this topic, but none of them have the same problem as i do. As i have seen, this error occurs when there's some problem in the funcion declaration or initialization, but both of mine have everything…
Franco Zalamena
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Error in VS2019 with Google Test when using outside definition

I just started a small console app in VS2019 and added a Google Test project. The program itself compiles and runs fine, however, if I move function code from the header to the cpp-file, I get the LNK2019 and LNK1120…
Markstar
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Visual Studio 2019 "error LNK2019: unresolved external symbol"

I have two Project, one is called NetCommon while the other called NetServer. The configuration type of NetCommon is .lib file while NetServer Project is .exe file. I have also add NetServer dependencies via Build Dependencies -> Project…
TPY-Lawrence
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DLL built and linked fine but still getting lnk2019 for struct and function defined in dll (C language)

I have created a dll where I have declared some functions that accept struct as parameters along with source where I have these functions defined. The library compiles without any issues but when I link it with my sample client program I get linker…
Ngage
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PCL: use Euclidean Cluster Extraction with labeled points makes a LNK error

I have a point cloud that contains labeled points, thus it is a pcl::PointCloud. I strictly followed what is said in this tutorial I need these labels, and I need to extract clusters from the point cloud. But when I call the ECE with…
Gaston
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error LNK2019: unresolved external symbol __stdio_common_vfprintf referenced in function _vfprintf_l

I have been stuck on an issue with building my driver due to a linker error. The driver has built in the past, but since then I have reset my PC and updated to Windows 10 Version 20H2. (It previously built on 1909 with no issues.) I downloaded the…
heyguys123
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How to solve LNK2019 unresolved external __imp____iob_func

Attempt to link with Visual Studio 2019 an old Visual Studio 2008 x86 project using Gsl library v1.13, I got this error on link step: LNK2019 symbole externe non résolu __imp____iob_func référencé dans la fonction _gsl_error Options are same from…
N i c o l a s
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Error LNK2019 unresolved external symbol - Multiple Class calling within one DLL

I have a DLL contains an encapsulated class, let's call it class A, and it works fine. now I want to add another class inside the same DLL; class A call class B. this causes a linking error(but they are inside the same DLL).if I remove class B…
ma1169
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Proper way to deal with LNK errors

So I've been programming for a little while and I run into LNK errors all the time and just don't really know how to deal with them. Most often I get Unresolved external symbol or '. . . ' was already defined in . obj. This probably comes from how I…
Hydrated Dragon
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Linking error "LNK2019: unresolved external symbol" without external libraries

I've seem to be having problems with the linker while working on a slightly bigger project. (I'm using Visual Studios 2019. I'm trying to recreate code from Lubos Briedas "Plasma Simulation by Example" and there are some mistakes in the book, even…
Silas
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Unresolved externals when using libpng

VS beginner here! I'm using the libpng library, which I installed via NuGet in VS 2019, for a C++ project. I have a function loadPng in renderer.h that reads a png along the lines of the manual. png.h is included. The code itself has no errors.…
AnonPJ
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