Get client certificate using activeX

I am struggling to put together a smart card security solution.

My clients will have a card reader and a card to identify them in the system (web application).

I need to set up an activeX element that will read the card, fetch the required information and send it to the web server.

This is my first job with smart cards, digital certificates, activeX, ssl and https. As expected, my timeline is pretty short and I am the first in my company to work with these elements.

I managed to work with ssl and HTTPS, smartcards ok, digital certificates ok, activex x is ok too.

Now I am facing this problem to use my activeX to read additional information that I need from a smart card.

Can anyone help me? I would appreciate an understanding of this issue, some links worth reading, and some examples if possible.