Introduction - If you have any usage issues, please Google them yourself
COM, which is Component Object Model (Component Object Model), which itself is a specific platform-independent standards that support Automation function. VC ATL (activity Template Library) provides a simple and flexible way to create COM object, because the space occupied by small, the controls are built very small. ATL therefore we choose to design and develop a COM component, the component in the window drawing a double pendulum and may amend function parameters to repaint components, thus producing dynamic effect