Error while linking SFML. LNK2001 - c++

Question

i am creating a project using SFML. Everything worked fine up until now. I created a class called BufferHelper.cpp and then an error showed up.
I am working with:
Visual Studio Professional 2013
SFML 2.1
Windows 8.1
I have added all libaries
the 'sfml-lib.dll's for Release
and 'sfml-lib-d.dll's for Debug
Error log:
Error 1 error LNK2001: unresolved external symbol "public: class sf::SoundBuffer __thiscall BufferHelper::MergeBuffers(class sf::SoundBuffer,class sf::SoundBuffer)" (?MergeBuffers#BufferHelper##QAE?AVSoundBuffer#sf##V23#0#Z) C:\Users\Krisjanis\documents\visual studio 2013\Projects\BD_Test\BD_Test\main.obj BD_Test
Error 2 error LNK1120: 1 unresolved externals C:\Users\Krisjanis\documents\visual studio 2013\Projects\BD_Test\Release\BD_Test.exe BD_Test
Main.cpp
#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>
#include <iostream>
#include "BufferHelper.h"
int main()
{
sf::SoundBufferRecorder recorder;
sf::SoundBufferRecorder recorder2;
sf::SoundBuffer buffer;
sf::SoundBuffer buffer2;
sf::Sound sound;
sf::Sound sound2;
int iTrackActive = 1;
bool bTrack1Active = true;
bool bTrack2Active = false;
sf::RenderWindow window(sf::VideoMode(1200, 800), "Loopify!");
//sf::RenderWindow window(sf::VideoMode(1200, 800), "Loopify!", sf::Style::Fullscreen);
sf::Texture texture;
texture.loadFromFile("images/a.png");
BufferHelper a;
sf::SoundBuffer finalbuffer = a.MergeBuffers(buffer, buffer2);
sf::Sprite sprite;
sprite.setTexture(texture);
bool recording = false;
if (!sf::SoundBufferRecorder::isAvailable())
{
std::cout << "Recorder not available";
}
else
{
std::cout << "GO AHEAD AND RECORD";
}
while (window.isOpen())
{
sf::Event event;
while (window.pollEvent(event))
{
if (event.type == sf::Event::Closed)
window.close();
if (event.type == sf::Event::KeyPressed)
{
if (event.key.code == sf::Keyboard::Space && !recording)
{
recording = true;
recorder.start();
}
else if (event.key.code == sf::Keyboard::Space && recording)
{
recorder.stop();
recording = false;
if (iTrackActive == 1)
{
buffer = recorder.getBuffer();
sound.setBuffer(buffer);
sound.setLoop(true);
sound.play();
}
if (iTrackActive == 2)
{
buffer2 = recorder.getBuffer();
sound2.setBuffer(buffer);
sound2.setLoop(true);
sound2.play();
}
}
else if (event.key.code == sf::Keyboard::Num1)
{
iTrackActive = 1;
}
else if (event.key.code == sf::Keyboard::Num2)
{
iTrackActive = 2;
}
}
}
window.clear();
window.draw(sprite);
window.display();
}
return 0;
}
BufferHelper.cpp
#include <SFML/System.hpp>
#include <SFML/Audio.hpp>
#include "BufferHelper.h"
#include <iostream>
#include <vector>
BufferHelper::BufferHelper()
{
}
sf::SoundBuffer MergeBuffers(sf::SoundBuffer BufferOne, sf::SoundBuffer BufferTwo)
{
int iLength;
int iShortLength;
const sf::Int16* LongerSamples;
const sf::Int16* ShorterSamples;
if (BufferOne.getSampleCount() > BufferTwo.getSampleCount())
{
LongerSamples = BufferOne.getSamples();
ShorterSamples = BufferTwo.getSamples();
iLength = BufferOne.getSampleCount();
iShortLength = BufferTwo.getSampleCount();
}
else
{
LongerSamples = BufferTwo.getSamples();
ShorterSamples = BufferOne.getSamples();
iLength = BufferTwo.getSampleCount();
iShortLength = BufferOne.getSampleCount();
}
std::vector<sf::Int16> FinalSamplesVector;
FinalSamplesVector.reserve(iLength);
for (int i = 0; i < iLength; i++)
{
if (i < iShortLength)
{
double dSampleOne = (LongerSamples[i] + 32768.) / 65535.;
double dSampleTwo = (ShorterSamples[i] + 32768.) / 65535.;
double dResult = 0;
if (dSampleOne < 0.5 && dSampleTwo < 0.5)
{
dResult = 2 * dSampleOne * dSampleTwo;
}
else
{
dResult = 2 * (dSampleOne + dSampleTwo) - 2 * dSampleOne * dSampleTwo - 1;
}
FinalSamplesVector.push_back(static_cast<sf::Int16>(dResult * 65535. - 32768.));
}
else
{
FinalSamplesVector.push_back(LongerSamples[i]);
}
}
sf::SoundBuffer FinalBuffer;
FinalBuffer.loadFromSamples(&FinalSamplesVector[0], FinalSamplesVector.size(), 2, 44100);
return FinalBuffer;
}
BufferHelper::~BufferHelper()
{
}
BufferHelper.h
#pragma once
#include <SFML/Graphics.hpp>
#include <SFML/Audio.hpp>
using namespace sf;
class BufferHelper
{
public:
BufferHelper();
sf::SoundBuffer MergeBuffers(sf::SoundBuffer, sf::SoundBuffer);
~BufferHelper();
};
I will be thankful to recieve any kind of feedback.

Answer 1

You did not declare the body of the function MergeBuffers().
This has nothing to do with SFML, just add
sf::SoundBuffer BufferHelper::MergeBuffers(sf::SoundBuffer, sf::SoundBuffer)
{
// some code
}
in your cpp file.
Edit : I realize you mistakenly re-copied your main.cpp file code. Please show the good code for BufferHelper.cpp