Zig

PC/SC Find Inserted Smart Cards

See more SCard Examples

Get detailed information about each reader including whether or not a smart card is currently inserted in the reader. (Also includes USB tokens.)

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;
    };

    // Get JSON containing information about the smartcards currently inserted into readers.
    // This also includes information about USB security tokens.
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    scard.findSmartcards(json) catch {
        std.debug.print("{s}\n", .{try scard.getLastErrorText(alloc)});
        return;
    };

    json.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json.emit(alloc)});

    // Here is sample output:
    // See below for sample code to parse the JSON.

    // You can see which readers have a card inserted by the "state".
    // If the state contains "present", then a card is inserted into the reader.
    // (USB tokens will typically always have a state containing "present")
    // Also, the ATR of the card inserted into the reader is indicated by "atr".

    // {
    //   "reader": [
    //     {
    //       "name": "Alcor Micro USB Smart Card Reader 0",
    //       "state": "present,inuse",
    //       "vendorName": "Alcor Micro",
    //       "systemName": "Alcor Micro USB Smart Card Reader 0",
    //       "card": {
    //         "atr": "3B7F96000080318065B0855956FB120FFE829000",
    //         "windows": {
    //           "miniDriver": "AxaltoCM.dll",
    //           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
    //           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
    //         }
    //       }
    //     },
    //     {
    //       "name": "FS USB Token 0",
    //       "state": "present,inuse",
    //       "vendorName": "FS",
    //       "serialNumber": "3F",
    //       "systemName": "FS USB Token 0",
    //       "card": {
    //         "atr": "3B9F958131FE9F006646530534002571DF000000000012",
    //         "windows": {
    //           "miniDriver": "eps2003csp11",
    //           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
    //           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
    //         }
    //       }
    //     },
    //     {
    //       "name": "FT Java Token 0",
    //       "state": "present",
    //       "vendorName": "FT",
    //       "serialNumber": "3F",
    //       "systemName": "FT Java Token 0",
    //       "card": {
    //         "atr": "3BFC180000813180459067464A00642D70C172FEE0FE",
    //         "windows": {
    //           "miniDriver": "tagliov70px.dll",
    //           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
    //           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
    //         }
    //       }
    //     },
    //     {
    //       "name": "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0",
    //       "state": "present",
    //       "vendorName": "SCM Microsystems Inc.",
    //       "serialNumber": "333130303330",
    //       "systemName": "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0",
    //       "card": {
    //         "atr": "3BFC180000813180459067464A00641606F2727E00E0",
    //         "windows": {
    //           "miniDriver": "tagliov70px.dll",
    //           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
    //           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
    //         }
    //       }
    //     },
    //     {
    //       "name": "Yubico YubiKey OTP+FIDO+CCID 0",
    //       "state": "present",
    //       "vendorName": "Yubico",
    //       "serialNumber": "3F",
    //       "systemName": "Yubico YubiKey OTP+FIDO+CCID 0",
    //       "card": {
    //         "atr": "3BFD1300008131FE158073C021C057597562694B657940",
    //         "windows": {
    //           "miniDriver": "msclmd.dll",
    //           "cryptoProvider": "Microsoft Base Smart Card Crypto Provider",
    //           "keyStorageProvider": "Microsoft Smart Card Key Storage Provider"
    //         }
    //       }
    //     }
    //   ]
    // }

    // Use this online tool to generate parsing code from sample JSON:
    // Generate Parsing Code from JSON

    var name: [:0]const u8 = "";
    var state: [:0]const u8 = "";
    var vendor_name: [:0]const u8 = "";
    var system_name: [:0]const u8 = "";
    var card_atr: [:0]const u8 = "";
    var card_windows_mini_driver: [:0]const u8 = "";
    var card_windows_crypto_provider: [:0]const u8 = "";
    var card_windows_key_storage_provider: [:0]const u8 = "";
    var serial_number: [:0]const u8 = "";

    var i: i32 = 0;
    const count_i = json.sizeOfArray("reader");
    while (i < count_i) {
        json.setI(i);
        name = try json.stringOf(alloc, "reader[i].name");
        state = try json.stringOf(alloc, "reader[i].state");
        vendor_name = try json.stringOf(alloc, "reader[i].vendorName");
        system_name = try json.stringOf(alloc, "reader[i].systemName");
        card_atr = try json.stringOf(alloc, "reader[i].card.atr");
        card_windows_mini_driver = try json.stringOf(alloc, "reader[i].card.windows.miniDriver");
        card_windows_crypto_provider = try json.stringOf(alloc, "reader[i].card.windows.cryptoProvider");
        card_windows_key_storage_provider = try json.stringOf(alloc, "reader[i].card.windows.keyStorageProvider");
        serial_number = try json.stringOf(alloc, "reader[i].serialNumber");
        i = i + 1;
    }

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