If a card is not present then a CSmartcardException with SCARD_W_REMOVED_CARD (0x80100069) error code will be thrown. Void CSmartcard::Connect(CString &reader)ĭWORD protocols(SCARD_PROTOCOL_T0 | SCARD_PROTOCOL_T1) connect to card on specified reader, throws CSmartcardException The new Connect member function is implemented as follows: and connect to the first one and read the UID from the card on it. Like this:Īuto readerList = smartcard.ListReaders() So we shall use the ListReaders function from our previous article ( How to list smart card readers using PC/SC) to get our list of readers and connect to the first reader in the list. It is possible to wait for a card to be presented but we shall discuss that in a future article. The challenge and potential sticking point is with SCardConnect, as one of its parameters requires the name of the card reader and also for it to work a card needs to be on the card reader. (See section 3.3.5.1.3 in Part 3 of the PC/SC specification for more details on this command. Send the Get Data Command using SCardTransmit. Connect to the card on the reader (SCardConnect)ģ. Get context handle (SCardEstablishContext)Ģ. The steps required in reading the UID from a contactless card requires the following steps.ġ. Readers: HID Omnikey 5021CL, ACS ACR122 & Identive CLOUD 3700 FĬards: MIFARE Classic 1K, MIFARE Ultralight, MIFARE DESFire EV1 Reading the UID This code has been tested with the following :
It is also possible for a card to produce a random UID.
The UID can be 4 bytes (32bit), 7 bytes (56Bit) or 10 bytes (80bit). This number is created during the manufacturing process, it is sometimes referred to as the card serial number. Each card contains an integrated chip with a permanent identification number, or UID. The article shows how to use the PC/SC Windows API to read the unique identifier (UID) from a contactless storage card. During the course of these articles we shall be developing a simple class for handling the smart card API. It also assumed that the reader has a grasp of C++11 and Windows development. The code in these articles will be in C++11 using the Unicode character set and has been tested with Microsoft Visual Studio 2015 Community. This is the second article on using the PC/SC Smart Card API in Windows with PC/SC card readers.
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