C / C++ / MFC

_tfopen_s(&fileptr, File_Path, _T("wb+") );
         fwrite ( buffer1, 25, 1, fileptr );
	fclose(fileptr);

_tfopen_s(&fileptr, File_Path, _T("ab") );
	fwrite ( buffer1, 25, 1, fileptr );
	fclose(fileptr);

Point pntA = new Point(10, 25);
Point pntB = new Point();

unsafe
{
  // Error	4	
  // You cannot use the fixed statement to take 
  // the address of an already fixed expression	
  fixed (Point* ptrA = &pntA, ptrB = &pntB)
  {
    ptrB->X = ptrA->X;
    ptrB->Y = ptrA->Y;
  }
}

Point pntA = new Point(10, 25);
Point pntB = new Point();

unsafe
{
  // Correct
  Point* ptrA = &pntA, ptrB = &pntB;
  ptrB->X = ptrA->X;
  ptrB->Y = ptrA->Y;
}

// /clr
generic <typename T> where T : value struct
T GetValueA(void* ptr)
{
  T val = Activator::CreateInstance<T>();

  pin_ptr<T> valPtr = &val;
  memcpy(valPtr, ptr, sizeof(T));
  return val;
}

generic <typename T> where T : value struct
T GetValueB(void* ptr)
{
  T val = Activator::CreateInstance<T>();

  memcpy(&val, ptr, sizeof(T));
  return val;
}