how to read from smart card reader in verifone vx520?

Question

I want to read data from smart card and use APDU to read and write to the smart card. I don't have LIBVOY.A in my sdk. Where can I download the library?Here is my code but it doesn't read any data from smart card.

handle = open("/dev/icc1",0);
wait_evt(EVT_ICC1_INS);
read(handle, buf, 20);
printf("reading:%s",buf);