text: #if !defined(LIBRARY_HPP)
  #define LIBRARY_HPP
  
  #include <string>
  
  #if !defined(_WIN32)
      typedef void* DLL_HANDLE;
  #else
      #include <Windows.h>
      typedef HINSTANCE DLL_HANDLE;
  #endif
  
  DLL_HANDLE OpenDll(const char* dllName, const char* reqFunc);
  const char* GetDllError();
  void* GetFuncPtr(DLL_HANDLE dllHandle, const char* funcName);
  
  #endif // !defined(LIBRARY_HPP)
  