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<?xml version="1.0" encoding="UTF-8"?>
<refentry id="scgetdata">
<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
<refmeta>
<refentrytitle>sc_get_data</refentrytitle>
<manvolnum>3</manvolnum>
<refmiscinfo>opensc</refmiscinfo>
</refmeta>
<refnamediv>
<refname>sc_get_data</refname>
<refpurpose>Get a primitive data object from a card</refpurpose>
</refnamediv>
<refsect1>
<title>Synopsis</title>
<para>
<programlisting>
#include <opensc.h>
int sc_get_data(sc_card_t *card, unsigned int tag,
unsigned char *buf, size_t buflen);
</programlisting>
</para>
</refsect1>
<refsect1>
<title>Description</title>
<para>
This function is used to retrieve a primitive data object from
<emphasis>card</emphasis>. It corresponds to the GET DATA command in the
<link linkend="iso7816">ISO 7816</link> standard. The data is stored in
<emphasis>buf</emphasis>, which is <emphasis>buflen</emphasis> bytes long.
</para>
<para>
The <emphasis>tag</emphasis> parameter specifies the object to be retrieved.
Refer to the standard for the correct values to use.
</para>
</refsect1>
<refsect1>
<title>Return value</title>
<para>
Returns 0 if successful, or a negative value in case of error.
</para>
</refsect1>
</refentry>
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