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c++externalsymbolslnk2019

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 added playsound works when called from main() When i try to call it from class in playsound.cpp it calls error...

playsounds.h

#pragma once
#include <Windows.h>

class Sounds
{
public:
Sounds();
~Sounds();

void soundBox();
};

playsound.cpp

#include "playsound.h"

Sounds::Sounds()
{

}

void soundBox()
{
PlaySound(TEXT("fx/boom1.wav"), NULL, SND_FILENAME);
}


Sounds::~Sounds()
{

}

main.cpp

#include <iostream>
#include <conio.h>
#include "playsound.h"    

int main()
{
Sounds newsound;

newsound.soundBox();

_getch();
}
Solution

  • You need to change the function definition in playsound.cpp

    void soundBox()

    To

    void Sounds::soundBox()

    This is because the function exists within the scope of the Sounds class, so you have to define it as such. Otherwise it would be a free function, and the version of the function in your Sounds class would be undefined (which is what the error is telling you).