Go

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.

Go

    success := false

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

    scard := chilkat.NewSCard()

    // First establish a context to the PC/SC Resource Manager
    success = scard.EstablishContext("user")
    if success == false {
        fmt.Println(scard.LastErrorText())
        scard.DisposeSCard()
        return
    }

    // Get JSON containing information about the smartcards currently inserted into readers.
    // This also includes information about USB security tokens.
    json := chilkat.NewJsonObject()
    success = scard.FindSmartcards(json)
    if success == false {
        fmt.Println(scard.LastErrorText())
        scard.DisposeSCard()
        json.DisposeJsonObject()
        return
    }

    json.SetEmitCompact(false)
    fmt.Println(*json.Emit())

    // 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 *string = new(string)
    var state *string = new(string)
    var vendorName *string = new(string)
    var systemName *string = new(string)
    var cardAtr *string = new(string)
    var cardWindowsMiniDriver *string = new(string)
    var cardWindowsCryptoProvider *string = new(string)
    var cardWindowsKeyStorageProvider *string = new(string)
    var serialNumber *string = new(string)

    i := 0
    count_i := json.SizeOfArray("reader")
    for i < count_i {
        json.SetI(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 {
        fmt.Println(scard.LastErrorText())
    }


    scard.DisposeSCard()
    json.DisposeJsonObject()