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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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LNK2019: unresolved external symbol; am I oblivious?

I'm a newbie to C++, and I seem to be getting this error a whole lot. It's really frustrating as it's totally hindering my production on this assignment. I kinda understand the principle of the error, but the function is defined before it is called,…
Azzah
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How to resolve external symbol

I am creating a model of a bank system in C++, and there are multiple account types, all inheriting from the base class Account. I am unsure exactly what is causing the LNK errors, as I do not believe that I am using external libraries to the…
Yann
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LNK2019 Unresolved External Symbol Help Please

I'm trying to test a program and every time I go to compile it, I get the error LNK2019: unresolved external symbol "public: __thiscall Prog3Graph::Prog3Graph(void)" (??0Prog3Graph@@QAE@XZ) referenced in function _main. I was wondering what is…
John Smith
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Visual Studio 2012 linking issues

Visual Studio seems to be going wild recently. I am working on a simple c++ project, which includes one header with definitions + cpp file with declarations. That's it. Simple include guard, .h is included in both source files. Now i find myself…
Ghostli
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LNK 2019 unresolved external symbol...again

So I've read most post down here regarding this error, I'm still unable to understand the cause of my error. The project consists of 2 header files along with cpp implementations + main cpp file. DbApi.h contains definitions for functions…
Ghostli
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LNK2019: unresolved error in singletone

i need help to figure out what wrong about that code: class DatabaseEngine { protected: DatabaseEngine(); static DatabaseEngine* m_DatabaseEngine; public: static DatabaseEngine& instance(); void do_something(); }; cpp: #include…
Omer Bar
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OpenCV error: LNK2019

I'm using OpenCV 2.4.6 and Visual Studio 2008 with Windows8.1 x86. When I debug my program it signal me 9 errors: 1>FYD_control.obj : error LNK2019: unresolved external symbol "int __stdcall cv::waitKey(int)" (?waitKey@cv@@YGHH@Z) referenced in…
Simone Fani
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Error LNK1120 and LNK 2019 while changing the datatypes from float to double

In the code it is compiling when i use float datatypes then when changing the float to double in typedef there are above linking errors. Error 12 fatal error LNK1120: 11 unresolved externals …
mony
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C++ templated member function linker errors in client application

I tried the recommendation here. I have the following class with a templated member function defined in the implementation as follows: Header (with compiler DLL import directive evaluated as __declspec(dllimport) in client application): class…
squashed.bugaboo
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Qt 5.1 - "Add library" error on build. LNK2019

I'm trying to link a c++ library (created in Qt) to a console application. In pure c++ I did link the library dll to the program with sucess. In Qt I get the LNK2019: unresolved external symbol. Library LibA headers *liba_global.h* #ifndef…
Iagows
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Can not find function that defined in header file in C (JNI)

I made .c file to use in JNI. .java, .h, .c and compiled nicely:D My environment is Windows 7 64 bits. However, the problem that I am facing is about another external library. I received a library that consists of one header file and one lib…
Juneyoung Oh
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C++ - LNK 2019 Error, Trying to Define a Subclass Static Function

The call that generates the unresolved external symbol: #include #include "GContext.h" #include "GBitmap.h" #include "GColor.h" int main(int argc, char** argv) { const int W = 100; const int H = 100; GContext* ctx =…
Anne Theodore
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Error LNK2019 during linking in VS2010

I began C++ quite recently and I obviously have the famous LNK2019 issue. I roamed a few hours on google but nothing solved my problem. My project is half way coded, since I separate the view and the model. I work with Visual Studio 2010. Here is…
Glembalis
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A LNK 2019 Error with my class I created

I have beeen using this template to make my classes to store data for various parts of my program. //Classs that DOES NOT work //"MiningPars.h" #pragma once #ifndef MININGPAR_H #define MININGPAR_H #include #include using…
Grogie
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LNK2019 error but Intellisense works fine

I have a native C++ unit test project that is throwing a LNK2019 error for every function call in the project under test. Surprisingly though, IntelliSense works just fine! The project under test is a static library (.lib) comprised of a single…
Justin R.
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