   Undefined reference to...
  Agggh i get these errors every time i compile undefined reference to `Bitmap::Bitmap(HDC__*, char*)' undefined reference to `Bitmap::Draw(HDC__*, int, int)'undefined reference to `GameEngine::m_pGameEngine'undefined reference to `GameEngine::m_pGameEngine'undefined reference to `GameEngine::m_pGameEngine'Any suggestions?-Thanks   
  The error means just what it says, you're trying to reference something which has not been defined. You may be missing an include file or have just forgotten to define your functions/variables before trying to use them.More code would be helpfull if you still can't figure it out.   ;  If Bitmap and GameEngine are classes that you made, than it's likley that you have code which calls those functions and you haven't defined them yet.Otherwise, make sure that you are including all necessary headers and your linker options are correct.Like Driv3MeFar said, some source code would really be nice, and whether or not you made the classes which you are getting the undefined refrences for.   