---
name: "sc_card_t"
section: "3"
platform: "linux"
package: "libopensc2-dev"
version: "0.11.13-1.1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/sc_card_t"
---

# sc\_card\_t(3)

OpenSC card structure

## NAME

sc\_card\_t - OpenSC card structure

## SYNOPSIS

```
#include <opensc.h>
#define SC_MAX_ATR_SIZE         33
#define SC_MAX_CARD_APPS         8
typedef struct sc_card {
	struct sc_context *ctx;
	struct sc_reader *reader;
	struct sc_slot_info *slot;
	struct sc_app_info *app[SC_MAX_CARD_APPS];
	unsigned char atr[SC_MAX_ATR_SIZE];
	size_t atr_len;
} sc_card_t;
```

## DESCRIPTION

This structure describes a smart card object. It contains the following members:

*ctx*

The context this card is associated with.

*reader*

The reader this card is inserted into.

*slot*

The slot on the reader this card is inserted into.

*atr*

The ATR (Answer To Reset) of the card.

*atr\_len*

The length of the *atr* field