Visual FoxPro

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.

Visual FoxPro

LOCAL lnSuccess
LOCAL loScard
LOCAL loJson
LOCAL lcName
LOCAL lcState
LOCAL lcVendorName
LOCAL lcSystemName
LOCAL lcCardAtr
LOCAL lcCardWindowsMiniDriver
LOCAL lcCardWindowsCryptoProvider
LOCAL lcCardWindowsKeyStorageProvider
LOCAL lcSerialNumber
LOCAL i
LOCAL lnCount_i

lnSuccess = 0

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

loScard = CreateObject('Chilkat.SCard')

* First establish a context to the PC/SC Resource Manager
lnSuccess = loScard.EstablishContext("user")
IF (lnSuccess = 0) THEN
    ? loScard.LastErrorText
    RELEASE loScard
    CANCEL
ENDIF

* Get JSON containing information about the smartcards currently inserted into readers.
* This also includes information about USB security tokens.
loJson = CreateObject('Chilkat.JsonObject')
lnSuccess = loScard.FindSmartcards(loJson)
IF (lnSuccess = 0) THEN
    ? loScard.LastErrorText
    RELEASE loScard
    RELEASE loJson
    CANCEL
ENDIF

loJson.EmitCompact = 0
? loJson.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

i = 0
lnCount_i = loJson.SizeOfArray("reader")
DO WHILE i < lnCount_i
    loJson.I = i
    lcName = loJson.StringOf("reader[i].name")
    lcState = loJson.StringOf("reader[i].state")
    lcVendorName = loJson.StringOf("reader[i].vendorName")
    lcSystemName = loJson.StringOf("reader[i].systemName")
    lcCardAtr = loJson.StringOf("reader[i].card.atr")
    lcCardWindowsMiniDriver = loJson.StringOf("reader[i].card.windows.miniDriver")
    lcCardWindowsCryptoProvider = loJson.StringOf("reader[i].card.windows.cryptoProvider")
    lcCardWindowsKeyStorageProvider = loJson.StringOf("reader[i].card.windows.keyStorageProvider")
    lcSerialNumber = loJson.StringOf("reader[i].serialNumber")
    i = i + 1
ENDDO

* Applications should always release the context when finished.
lnSuccess = loScard.ReleaseContext()
IF (lnSuccess = 0) THEN
    ? loScard.LastErrorText
ENDIF

RELEASE loScard
RELEASE loJson