man Chipcard::PCSC () - Smarcard reader interface library


Chipcard::PCSC - Smarcard reader interface library


 my $hContext = new Chipcard::PCSC();

 @ReadersList = $hContext->ListReaders ();


 $hContext->GetStatusChange(\@readers_states, $timeout);

 $apdu = Chipcard::PCSC::array_to_ascii(@apdu);

 @apdu = Chipcard::PCSC::ascii_to_array($apdu);

 $hContext = undef;


The PCSC module implements the Chipcard::PCSC class. Objects of this class are used to communicate with the PCSC-lite daemon (see pcscd(1) for more information).

PC/SC represents an abstraction layer to smartcard readers. It provides a communication layer with a wide variety of smart card readers through a standardized API.

A PCSC object can be used to communicate with more than one reader through Chipcard::PCSC::Card objects. Please read Chipcard::PCSC::Card for extended information on how to talk to a smart card reader.

A PCSC object uses the following property: CW$pcsc_object->{hContext} the context returned by the pcsc library


The following methods can be used to construct a PCSC object:

CW$scope is the scope of the connection to the PC/SC daemon. It can be any of the following:
 $Chipcard::PCSC::SCARD_SCOPE_USER     (not used by PCSClite);
 $Chipcard::PCSC::SCARD_SCOPE_TERMINAL (not used by PCSClite);
 $Chipcard::PCSC::SCARD_SCOPE_SYSTEM   Services on the local machine;
 $Chipcard::PCSC::SCARD_SCOPE_GLOBAL   Services on a remote host.
CW$remote_host is the host name of the remote machine to contact. It is only used when CW$scope is equal to CW$Chipcard::PCSC::SCARD_SCOPE_GLOBAL. A null value means localhost.
* $hContext = new Chipcard::PCSC($scope);
This method is equivalent to:
 $hContext = new Chipcard::PCSC($scope, 0);
* $hContext = new BIChipcard::PCSC();
This method is equivalent to:
 $hContext = new Chipcard::PCSC($Chipcard::PCSC::SCARD_SCOPE_SYSTEM, 0);


Chipcard::PCSC constructors return an CWundef value when the object can not be created. CW$Chipcard::PCSC::errno can be used to get more information about the error. (See section ERROR HANDLING below for more information)


Here is a list of all the methods that can be used with a PCSC object. This method returns the available readers in the given CW$group. If ommited, CW$group defaults to a null value meaning all groups. Please note that as of this writing, CW$group can safely be ommited as it is not used by PCSClite. The return value upon succesful completion is an array of strings: one string by available reader. If an error occured, the undef value is returned and CW$Chipcard::PCSC::errno should be used to get more informations about the error. (See section ERROR HANDLING below for more information). The following example describes the use of ListReaders:

 $hContext = new Chipcard::PCSC();
 die ("Can't create the PCSC object: $Chipcard::PCSC::errno\n")
        unless (defined $hContext);
 @ReadersList = $hContext->ListReaders ();
 die ("Can't get readers' list: $Chipcard::PCSC::errno\n")
        unless (defined($ReadersList[0]));
 $, = "\n  ";
 print @ReadersList . "\n";
The method CW$hContext->GetStatusChange(\@readers_states, $timeout) uses a reference to a list of hashs.
 # create the list or readers to watch
 map { push @readers_states, ({'reader_name'=>"$_"}) } @ReadersList;
 @StatusResult = $hContext->GetStatusChange(\@readers_states);
The keys of the hash are: 'reader_name', 'current_state', 'event_state' and 'ATR'. To detect a status change you have to first get the status and then copy the 'event_state' in the 'current_state'. The method will return when both states are different or a timeout occurs.
* $hContext->GetStatusChange(\@readers_states);
This method is equivalent to:
 $hContext->GetStatusChange(\@readers_states, 0xFFFFFFFF);
The timeout is set to infinite.
* $apdu_ref = Chipcard::PCSC::ascii_to_array($apdu);
The method CWChipcard::PCSC::Card::Transmit() uses references to arrays as in and out parameters. The CWChipcard::PCSC::ascii_to_array() is used to transform an APDU in ASCII format to a reference to an array in the good format. Example:
 $SendData = Chipcard::PCSC::ascii_to_array("00 A4 01 00 02 01 00");
* $apdu = Chipcard::PCSC::array_to_ascii($apdu_ref);
This method is used to convert the result of a CWChipcard::PCSC::Card::Transmit() into ASCII format. Example:
 $RecvData = $hCard->Transmit($SendData);
 print Chipcard::PCSC::array_to_ascii($RecvData);
This method sets the working time that RPC uses when waiting for a server. It returns true upon successful exacution or false otherwise. CW$timeout contains the new timeout value in seconds.
* $hContext->BISetTimeout();
This function is equivalent to:


All functions from PCSC objects save the return value in a global variable called CW$Chipcard::PCSC::errno. This variable therefore holds the latest status of PCSC.

It is a double-typed magical variable that behaves just like CW$!. This means that it both holds a numerical value describing the error and the corresponding string. The numerical value may change from a system to another as it depends on the PCSC library...

Here is a small example of how to use it:

 $hContext = new Chipcard::PCSC();
 die ("Can't create the PCSC object: $Chipcard::PCSC::errno\n")
     unless (defined $hContext);

In case the last call was successful, CW$Chipcard::PCSC::errno contains the CWSCARD_S_SUCCESS status. Here is a list of all possible error codes. They are defined as read-only variables with in the PCSC module:



PCSClite users will also be able to use the following (PCSClite specific) codes:


In addition, the wrapper defines:



pcscd(1) manpage has useful informations about PC/SC lite. Chipcard::PCSC::Card manpage gives informations about how to communicate with a reader and the smart card inside it.


(C) Lionel VICTOR & Ludovic ROUSSEAU, 2001-2004, GNU GPL


 Lionel VICTOR <>

 Ludovic ROUSSEAU <>