Zig

PC/SC List Smart Card Readers (and USB Tokens)

See more SCard Examples

Demonstrates how to list the smart card readers and USB tokens connected to the computer.

Note: This functionality was introduced in Chilkat v9.5.0.87.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    const scard = try chilkat.SCard.init();
    defer scard.deinit();

    // First establish a context to the PC/SC Resource Manager
    scard.establishContext("user") catch {
        std.debug.print("{s}\n", .{try scard.getLastErrorText(alloc)});
        return;
    };

    const st_readers = try chilkat.StringTable.init();
    defer st_readers.deinit();
    scard.listReaders(st_readers) catch {
        std.debug.print("{s}\n", .{try scard.getLastErrorText(alloc)});
        return;
    };

    const num_readers = st_readers.getCount();
    var i: i32 = 0;
    while (i < num_readers) {
        std.debug.print("{d}: {s}\n", .{ i, try st_readers.stringAt(alloc, i) });
        i = i + 1;
    }

    // Sample output:
    // 0: Alcor Micro USB Smart Card Reader 0
    // 1: FS USB Token 0
    // 2: FT Java Token 0
    // 3: SCM Microsystems Inc. SCR33x USB Smart Card Reader 0
    // 4: Yubico YubiKey OTP+FIDO+CCID 0

    // Applications should always release the context when finished.
    scard.releaseContext() catch {
        std.debug.print("{s}\n", .{try scard.getLastErrorText(alloc)});
    };
}