Thread: A few questions

Hi there.
i'm relatively new to directx.

I have a message loop from a book called Introduction to 3d Game Programming with Directx 9.0

here it is:

Code:

int d3d::EnterMsgLoop( bool (*ptr_display)(float timeDelta) )
{
	MSG msg;
	::ZeroMemory(&msg, sizeof(MSG));

	static float lastTime = (float)timeGetTime(); 

	while(msg.message != WM_QUIT)
	{
		if(::PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
		{
			::TranslateMessage(&msg);
			::DispatchMessage(&msg);
		}
		else
        {	
			float currTime  = (float)timeGetTime();
			float timeDelta = (currTime - lastTime)*0.001f;

			ptr_display(timeDelta);

			lastTime = currTime;
        }
    }
    return msg.wParam;
}

could someone clear this up for me please.
i understand a little, but not all of it.

thanks if anyone replies.

EDIT:
Oh yes, and what is HRESULT?