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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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How to call function from multiple cpp files

How can i include and use function in multiple cpp files? // my_function.h void func_i_want_to_include(); // my_function.cpp void func_i_want_to_include() { puts("hello world"); } //main.cpp #include "my_function.h" #include "file_b.h" int…
j.r.
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LNK2019 error with Linked Lists ( c programming)

I'm new at c programming, and during my learnings, lately I've started to deal with Linked lists. In this program that I wrote, i keep getting this message( LNK2019 error): unresolved external symbol _main referenced in function "int __cdecl …
Ori
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error LNK2019 in Unit Tests (CppUnitTestFramework) - C++

I'm trying to write 3 UnitTests. At build I receive an error fatal error LNK1120: 1 unresolved externals. Tell me in which direction to search! Completely error: 1>ProcessorsTests.obj : error LNK2019: unresolved external symbol "public: static class…
Nikita Kildibekov
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__iob_func referenced in function _gsl_error when using GSL library

Using GSL library 2.4 on Visual Studio 2017 and getting these errors on compile and run, Severity Code Description Project File Line Suppression State Error LNK2019 unresolved external symbol ___iob_func referenced in function…
theQuantumMechanic
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ffmpeg .libs windows visual studio 2008

I've downloaded the latest version of FFMPEG dev libraries, which include all the .libs etc I've created an MFC dialogue application in visual studio 2008 and setup all the dependencies as per Use FFmpeg in Visual Studio. However, I'm getting the…
DM1974
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LNK2019 With Qt and Gmock

I've been banging my head against the wall on this one for the past few days. I am trying to incorporate googletest's gmock library into my Qt Autotest subdir project, but have been receiving the following linker error and I am unsure on how to…
Stahlnusse
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Linking a static library to a new project in Visual C++

I am just beginning to learn C++ and using Visual Studio 2017 as the IDE. I want to stay away from the CLR, and even Windows specific code as much as possible. Every new project option seems to say 'Windows', and thus suggest Windows OS…
Steven Gillies
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Visual Studio LNK2019 when using std::string

I'm trying to use the std::string object but I always get LNK2019 error. The projects builds a DLL, this is the code: st.h #pragma once #ifndef ST_ #define ST_ #ifdef _WIN32 #define STDLL __declspec(dllexport) #else #define STDLL #endif extern…
user5062790
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OpenCV unresolved external errors with objdetect.hpp functions (C++)

I'm trying to compile a simple face detection program in C++ in VS2010 and have come across two LNK 2019 errors: Error 2 error LNK2019: unresolved external symbol _cvReleaseHaarClassifierCascade referenced in function _main Error 3 error LNK2019:…
Nemekh
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LNK2019 error when compiling code

I have some sample code that I was editing in Visual Studio 2010 to encrypt and decrypt using DES. For some reason, when I compile the code i keep getting these two LNK2019 errors that are referring to the des_encrypt1() function and the…
Joshua
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LNK2019 decoding the error message

I have seen many posts on why we get LNK2019 error and how to resolve it but I want to understand the error message which is generated. From reading the message I don't understand from where to begin. Could someone please help me understand which…
newbieDevloper
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LNK2019 when instantiating an object c++ on Qtcreator

I am a beginner in OO so this issue might be very basic. I have been getting the LNK2019 when I try to instantiate an object that I have defined in another header file: main.obj:-1: error: LNK2019: unresolved external symbol "public: virtual __cdecl…
Rayko
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Creating a mex file linked to Intel's ipp library

I'm trying to improve my matlab code performance by replacing a part of it with a a c++ program, and for that I'm using intel's ipp library. The problem occurs when trying to compile and link the program. I get the added error. I'm using Matlab2016a…
Nadav
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C++ singleton LNK2019 error

I'm trying to write a singleton in c++ - but I got LNK2019 error: Severity Code Description Project File Line Error LNK2019 unresolved external symbol "private: __thiscall DBWriter::DBWriter(void)" (??0DBWriter@@AAE@XZ) referenced in…
STF
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printf / _vsnprintf_l / already defined in msvcrtd.lib(MSVCR120D.dll)

I have project where I want to import library. When I do that (import .lib files from library) and than call any function from library I get following errors: "C:\Uz\myproj.vcxproj" (default target) (1) ->(Link target) -> …
user7042812
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