c++ - Can't get passed error LNK2001: unresolved external symbol, even if I seem to have included what is needed -

i trying create game c++ , smfl 2.0 , cant pass error , it's driving me crazy. have been reading around internet , seems can caused because of forgotten includes, still cant see have gone wrong. have included smfl 2.0 library in project properties section under c++ -> general -> additional include directories , under linker -> general -> additional library directories.

i'm blank , error message get:

1>------ build started: project: pang, configuration: debug win32 ------ 1>  game.cpp 1>  generating code... 1>  skipping... (no relevant changes detected) 1>  pang.cpp 1>game.obj : warning lnk4075: ignoring '/editandcontinue' due '/incremental:no' specification 1>game.obj : error lnk2001: unresolved external symbol "private: static class playerpaddle game::_player1" (?_player1@game@@0vplayerpaddle@@a) 1>c:\users\alexander\desktop\c++\projects\pang\debug\pang.exe : fatal error lnk1120: 1 unresolved externals ========== build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== 

microsoft visual c++ doesnt show syntax grammar errors red underline when im looking around code looks syntax ok. here relevant lines of code:

i have of general includes here:

stdafx.h

#pragma once  #include "targetver.h"  #include <stdio.h> #include <tchar.h> #include <windows.h>  #include <sfml/system.hpp> #include <sfml/graphics.hpp> #include <sfml/window.hpp> #include <sfml/audio.hpp>  #include <map> #include <iostream> #include <cassert> #include <list> 

visiblegameobject.h

#pragma once  class visiblegameobject {      public:         visiblegameobject();         virtual ~visiblegameobject();          virtual void load(std::string filename);         virtual void draw(sf::renderwindow &window);          virtual void setposition(float x, float y);      private:         sf::sprite  _sprite;         sf::texture _image;         std::string _filename;         bool _isloaded;  }; 

visiblegameobject.cpp

#include "stdafx.h" #include "visiblegameobject.h"  visiblegameobject::visiblegameobject() {     _isloaded = false; } visiblegameobject::~visiblegameobject() { } void visiblegameobject::load(std::string filename) {      if (_image.loadfromfile(filename) == false) {         _filename = "";         _isloaded = false;     }     else {         _filename = filename;         _sprite.settexture(_image);     } }  void visiblegameobject::draw(sf::renderwindow &renderwindow) {      if (_isloaded) {         renderwindow.draw(_sprite);     } }  void visiblegameobject::setposition(float x, float y) {      if (_isloaded) {         _sprite.setposition(x,y);     }  } 

this class helps me use smfl library draw images on rendered window.

playerpaddle.h

#pragma once #include "visiblegameobject.h"  class playerpaddle : public visiblegameobject {      public:         playerpaddle();         ~playerpaddle(); }; 

playerpaddle.cpp

#include "stdafx.h" #include "visiblegameobject.h" #include "playerpaddle.h"  playerpaddle::playerpaddle() { } playerpaddle::~playerpaddle() { } 

game.h

#pragma once #include "playerpaddle.h"  class game {  public:     static void start();  private:     static bool isexiting();     static void gameloop();      static void showsplashscreen();     static void showmenu();      enum gamestate { uninitialized, showingsplash, paused, showingmenu, playing, exiting };      static gamestate _gamestate;     static sf::renderwindow _mainwindow;     static playerpaddle _player1; }; 

game.cpp

#include "stdafx.h" #include "game.h" #include "splashscreen.h" #include "mainmenu.h"   void game::start(void) {      if(_gamestate != uninitialized) {         return;     }      _mainwindow.create(sf::videomode(1024,768,32),"pang!");      //_player1.load("images/paddle.png");     //_player1.setposition((1024/2)-45, 700);      _gamestate = game::showingsplash;      while(!isexiting()) {         gameloop();     }      _mainwindow.close(); }  bool game::isexiting() {      if(_gamestate == game::exiting) {         return true;     }     else {         return false;     } }  void game::gameloop() {      switch(_gamestate) {          case game::showingmenu: {             showmenu();             break;         }         case game::showingsplash: {             showsplashscreen();             break;         }         case game::playing: {             sf::event currentevent;             while (_mainwindow.pollevent(currentevent)) {                 _mainwindow.clear(sf::color(0,0,0));                 //_player1.draw(_mainwindow);                 _mainwindow.display();                  if (currentevent.type == sf::event::closed) {                     _gamestate = game::exiting;                 }                  if (currentevent.type == sf::event::keypressed) {                     return;                      if(currentevent.key.code == sf::keyboard::escape) {                         showmenu();                     }                  }             }             break;         }     } }  void game::showsplashscreen() {     splashscreen splashscreen;     splashscreen.show(_mainwindow);     _gamestate = game::showingmenu; }  void game::showmenu() {     mainmenu mainmenu;     mainmenu::menuresult result = mainmenu.show(_mainwindow);     switch(result) {         case mainmenu::exit: {             _gamestate = game::exiting;             break;         }         case mainmenu::play: {             _gamestate = game::playing;             break;         }     } }  game::gamestate game::_gamestate = uninitialized; sf::renderwindow game::_mainwindow; 

this code compiles , runs when 3 lines of codes starting _player1 in game.cpp commented out. when not commented out lnk2001 error , cant passed , quite frustrating.

would nice if had input on wrong here.

best of regards, alexander

your game.cpp misses definition of game::_player1:

playerpaddle game::_player1;