(MFC) 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.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkSCard.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkSCard scard;

    // First establish a context to the PC/SC Resource Manager
    bool success = scard.EstablishContext("user");
    if (success == false) {
        strOut.append(scard.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Get JSON containing information about the smartcards currently inserted into readers.
    // This also includes information about USB security tokens.
    CkJsonObject json;
    success = scard.FindSmartcards(json);
    if (success == false) {
        strOut.append(scard.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    json.put_EmitCompact(false);
    strOut.append(json.emit());
    strOut.append("\r\n");

    // 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

    // Chilkat functions returning "const char *" return a pointer to temporary internal memory owned and managed by Chilkat.
    // See this example explaining how this memory should be used: const char * functions.

    const char *name = 0;
    const char *state = 0;
    const char *vendorName = 0;
    const char *systemName = 0;
    const char *cardAtr = 0;
    const char *cardWindowsMiniDriver = 0;
    const char *cardWindowsCryptoProvider = 0;
    const char *cardWindowsKeyStorageProvider = 0;
    const char *serialNumber = 0;

    int i = 0;
    int count_i = json.SizeOfArray("reader");
    while (i < count_i) {
        json.put_I(i);
        name = json.stringOf("reader[i].name");
        state = json.stringOf("reader[i].state");
        vendorName = json.stringOf("reader[i].vendorName");
        systemName = json.stringOf("reader[i].systemName");
        cardAtr = json.stringOf("reader[i].card.atr");
        cardWindowsMiniDriver = json.stringOf("reader[i].card.windows.miniDriver");
        cardWindowsCryptoProvider = json.stringOf("reader[i].card.windows.cryptoProvider");
        cardWindowsKeyStorageProvider = json.stringOf("reader[i].card.windows.keyStorageProvider");
        serialNumber = json.stringOf("reader[i].serialNumber");
        i = i + 1;
    }

    // Applications should always release the context when finished.
    success = scard.ReleaseContext();
    if (success == false) {
        strOut.append(scard.lastErrorText());
        strOut.append("\r\n");
    }



    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }