(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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loScard
LOCAL lnSuccess
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

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.SCard')
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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
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