SCard Xojo Plugin Reference Documentation

SCard

Current Version: 11.1.0

A wrapper around the Resource Manager API of the PC/SC architecture for smart cards. On Windows it is a wrapper around the WinSCard functions implemented in the winscard.dll. On other systems (such as Linux) it is a wrapper around the same API implemented in pcsc-lite.so.

This class is introduced in Chilkat v9.5.0.87.

Object Creation

Dim sCard As New Chilkat.SCard

Properties

ActiveProtocol
ActiveProtocol As String (read-only)
Introduced in version 9.50.87

The name of the active protocol if connected smart card reader, or an empty string if not connected. Possible values are T0, T1, raw, undefined, or if not connected to a reader.

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CardAtr
CardAtr As String (read-only)
Introduced in version 9.50.87

This is the Current ATR of a card in the connected reader.

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ConnectedReader
ConnectedReader As String (read-only)
Introduced in version 9.50.87

The name of the currently connected smart card reader, or an empty string if not connected.

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Context
Context As String (read-only)
Introduced in version 9.50.87

Contains the string user or system if this object has established a context (by calling EstablishContext). Contains the empty string if no context is established.

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DebugLogFilePath
DebugLogFilePath As String

If set to a file path, this property logs the LastErrorText of each Chilkat method or property call to the specified file. This logging helps identify the context and history of Chilkat calls leading up to any crash or hang, aiding in debugging.

Enabling the VerboseLogging property provides more detailed information. This property is mainly used for debugging rare instances where a Chilkat method call causes a hang or crash, which should generally not happen.

Possible causes of hangs include:

  • A timeout property set to 0, indicating an infinite timeout.
  • A hang occurring within an event callback in the application code.
  • An internal bug in the Chilkat code causing the hang.

More Information and Examples
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LastErrorHtml
LastErrorHtml As String (read-only)

Provides HTML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorText
LastErrorText As String (read-only)

Provides plain text information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastErrorXml
LastErrorXml As String (read-only)

Provides XML-formatted information about the last called method or property. If a method call fails or behaves unexpectedly, check this property for details. Note that information is available regardless of the method call's success.

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LastMethodSuccess
LastMethodSuccess As Boolean

Indicates the success or failure of the most recent method call: True means success, False means failure. This property remains unchanged by property setters or getters. This method is present to address challenges in checking for null or Nothing returns in certain programming languages.

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PcscLibPath
PcscLibPath As String
Introduced in version 9.50.87

For Linux systems only. Specifies the full path of the libpcsclite.so shared lib. This property should only be used if the libpcsclite.so is in a non-standard location or if Chilkat cannot automatically located it.

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ReaderStatus
ReaderStatus As String (read-only)
Introduced in version 9.50.87

The current status of the connected reader. Possible values are:

  • absent - There is no card in the reader.
  • present - There is a card in the reader, but it has not been moved into position for use.
  • swallowed - There is a card in the reader in position for use. The card is not powered.
  • powered - Power is being provided to the card, but the reader driver is unaware of the mode of the card.
  • negotiable - The card has been reset and is awaiting PTS negotiation.
  • specific - The card has been reset and specific communication protocols have been established.

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ScardError
ScardError As String (read-only)
Introduced in version 9.50.87

The last error returned by an underlying PC/SC function. Can be one of the following:

  • SCARD_W_REMOVED_CARD - The smart card has been removed, so that further communication is not possible.
  • SCARD_W_RESET_CARD - The smart card has been reset, so any shared state information is invalid.
  • ...

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VerboseLogging
VerboseLogging As Boolean

If set to True, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is False. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
Version As String (read-only)

Version of the component/library, such as "10.1.0"

More Information and Examples
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Methods

BeginTransaction
Function BeginTransaction() As Boolean
Introduced in version 9.50.87

Establishes a temporary exclusive access mode for doing a series of commands in a transaction.

Returns True for success, False for failure.

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CheckStatus
Function CheckStatus() As Boolean
Introduced in version 9.50.87

Check the current status of the currently connected reader. Calling this method updates the ReaderStatus, ActiveProtocol, and CardAtr properties. If this method returns False, none of the properties are updated.

Returns True for success, False for failure.

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Connect
Function Connect(reader As String, shareMode As String, preferredProtocol As String) As Boolean
Introduced in version 9.50.87

Establish a connection to a reader. The reader is the name of a reader returned from ListReaders. The shareMode can be shared, exclusive, or direct. The preferredProtocol can be 0 (valid only if the shareMode = direct), T0, T1, raw, or no_preference. (No preference is effectively T0 or T1.)

If successful, the state of this object instance is that it's connected to the reader.

Returns True for success, False for failure.

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Disconnect
Function Disconnect(disposition As String) As Boolean
Introduced in version 9.50.87

Terminates a connection with a reader. The disposition can be one of the following values:

  • leave: Do nothing.
  • reset: Reset the card (warm reset).
  • unpower: Power down the card (cold reset).
  • eject: Eject the card.

Returns True for success, False for failure.

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EndTransaction
Function EndTransaction(disposition As String) As Boolean
Introduced in version 9.50.87

Ends a previously begun transaction. The disposition is the action to be taken on the reader, and can be leave which is to do nothing, reset, unpower, or eject.

Returns True for success, False for failure.

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EstablishContext
Function EstablishContext(scope As String) As Boolean
Introduced in version 9.5.0.87

Creates an Application Context to the PC/SC Resource Manager. This must be the first WinSCard function called in a PC/SC application. The scope can be user or system. After calling, this object will have context and all other methods will use the established context. The Context property will hold the value user or system if context was established, or will be empty if no context was established.

Returns True for success, False for failure.

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FindSmartcards
Function FindSmartcards(json As Chilkat.JsonObject) As Boolean
Introduced in version 9.50.87

Returns JSON containing information about the smartcards currently inserted into readers.

Returns True for success, False for failure.

More Information and Examples
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GetAttrib
Function GetAttrib(attr As String, bd As Chilkat.BinData) As Boolean
Introduced in version 9.50.87

Get an attribute from the IFD Handler (reader driver).

The attr can be one of the following:

  • ASYNC_PROTOCOL_TYPES
  • ATR_STRING
  • CHANNEL_ID
  • CHARACTERISTICS
  • CURRENT_BWT
  • CURRENT_CLK
  • CURRENT_CWT
  • CURRENT_D
  • CURRENT_EBC_ENCODING
  • CURRENT_F
  • CURRENT_IFSC
  • CURRENT_IFSD
  • CURRENT_IO_STATE
  • CURRENT_N
  • CURRENT_PROTOCOL_TYPE
  • CURRENT_W
  • DEFAULT_CLK
  • DEFAULT_DATA_RATE
  • DEVICE_FRIENDLY_NAME
  • DEVICE_IN_USE
  • DEVICE_SYSTEM_NAME
  • DEVICE_UNIT
  • ESC_AUTHREQUEST
  • ESC_CANCEL
  • ESC_RESET
  • EXTENDED_BWT
  • ICC_INTERFACE_STATUS
  • ICC_PRESENCE
  • ICC_TYPE_PER_ATR
  • MAX_CLK
  • MAX_DATA_RATE
  • MAX_IFSD
  • MAXINPUT
  • POWER_MGMT_SUPPORT
  • SUPRESS_T1_IFS_REQUEST
  • SYNC_PROTOCOL_TYPES
  • USER_AUTH_INPUT_DEVICE
  • USER_TO_CARD_AUTH_DEVICE
  • VENDOR_IFD_SERIAL_NO
  • VENDOR_IFD_TYPE
  • VENDOR_IFD_VERSION
  • VENDOR_NAME

The attribute data is returned in bd.

Returns True for success, False for failure.

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GetAttribStr
Function GetAttribStr(attr As String) As String
Introduced in version 9.50.87

Get a string typed attribute from the IFD Handler (reader driver).

The attr can be one of the following, but should be limited to the particular attributes that return string values.

  • ASYNC_PROTOCOL_TYPES
  • ATR_STRING
  • CHANNEL_ID
  • CHARACTERISTICS
  • CURRENT_BWT
  • CURRENT_CLK
  • CURRENT_CWT
  • CURRENT_D
  • CURRENT_EBC_ENCODING
  • CURRENT_F
  • CURRENT_IFSC
  • CURRENT_IFSD
  • CURRENT_IO_STATE
  • CURRENT_N
  • CURRENT_PROTOCOL_TYPE
  • CURRENT_W
  • DEFAULT_CLK
  • DEFAULT_DATA_RATE
  • DEVICE_FRIENDLY_NAME
  • DEVICE_IN_USE
  • DEVICE_SYSTEM_NAME
  • DEVICE_UNIT
  • ESC_AUTHREQUEST
  • ESC_CANCEL
  • ESC_RESET
  • EXTENDED_BWT
  • ICC_INTERFACE_STATUS
  • ICC_PRESENCE
  • ICC_TYPE_PER_ATR
  • MAX_CLK
  • MAX_DATA_RATE
  • MAX_IFSD
  • MAXINPUT
  • POWER_MGMT_SUPPORT
  • SUPRESS_T1_IFS_REQUEST
  • SYNC_PROTOCOL_TYPES
  • USER_AUTH_INPUT_DEVICE
  • USER_TO_CARD_AUTH_DEVICE
  • VENDOR_IFD_SERIAL_NO
  • VENDOR_IFD_TYPE
  • VENDOR_IFD_VERSION
  • VENDOR_NAME

Returns Nil on failure

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GetAttribUint
Function GetAttribUint(attr As String) As UInt32
Introduced in version 9.50.87

Get an unsigned integer typed attribute from the IFD Handler (reader driver).

The attr can be one of the following, but should be limited to the particular attributes that return unsigned integer values.

  • ASYNC_PROTOCOL_TYPES
  • ATR_STRING
  • CHANNEL_ID
  • CHARACTERISTICS
  • CURRENT_BWT
  • CURRENT_CLK
  • CURRENT_CWT
  • CURRENT_D
  • CURRENT_EBC_ENCODING
  • CURRENT_F
  • CURRENT_IFSC
  • CURRENT_IFSD
  • CURRENT_IO_STATE
  • CURRENT_N
  • CURRENT_PROTOCOL_TYPE
  • CURRENT_W
  • DEFAULT_CLK
  • DEFAULT_DATA_RATE
  • DEVICE_FRIENDLY_NAME
  • DEVICE_IN_USE
  • DEVICE_SYSTEM_NAME
  • DEVICE_UNIT
  • ESC_AUTHREQUEST
  • ESC_CANCEL
  • ESC_RESET
  • EXTENDED_BWT
  • ICC_INTERFACE_STATUS
  • ICC_PRESENCE
  • ICC_TYPE_PER_ATR
  • MAX_CLK
  • MAX_DATA_RATE
  • MAX_IFSD
  • MAXINPUT
  • POWER_MGMT_SUPPORT
  • SUPRESS_T1_IFS_REQUEST
  • SYNC_PROTOCOL_TYPES
  • USER_AUTH_INPUT_DEVICE
  • USER_TO_CARD_AUTH_DEVICE
  • VENDOR_IFD_SERIAL_NO
  • VENDOR_IFD_TYPE
  • VENDOR_IFD_VERSION
  • VENDOR_NAME

Returns 0xFFFFFFFF on failure.

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GetStatusChange
Function GetStatusChange(maxWaitMs As Int32, stReaderNames As Chilkat.StringTable, json As Chilkat.JsonObject) As Boolean
Introduced in version 9.50.87

Blocks execution until the current availability of the cards in a specific set of readers changes.

This function receives a list of reader names in stReaderNames. It then blocks waiting for a change in state to occur for a maximum blocking time of maxWaitMs (in milliseconds) or forever if 0 is used.

Information about the current reader states and which reader(s) changed is returned in json. See the example below for more information.

To wait for a reader event (reader added or removed) you may use the special reader name \\?PnP?\Notification.

To cancel the ongoing call, call Cancel().

The stReaderNames contains the reader names to check. The json is empty on input, and if the call returns success contains information about the state (after the event change) of each reader.

Returns True for success, False for failure.

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GetStatusChangeAsync (1)
Function GetStatusChangeAsync(maxWaitMs As Int32, stReaderNames As Chilkat.StringTable, json As Chilkat.JsonObject) As Chilkat.Task
Introduced in version 9.50.87

Creates an asynchronous task to call the GetStatusChange method with the arguments provided.

Note: Async method event callbacks happen in the background thread. Accessing and updating UI elements existing in the main thread may require special considerations.

Returns Nil on failure

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GetStatusChangeCancel
Function GetStatusChangeCancel() As Boolean
Introduced in version 9.50.87

Cancels an ongoing GetStatusChange method call. This would be called from a separate thread in your application if GetStatusChange was called synchronously.

Returns True for success, False for failure.

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ListReaderGroups
Function ListReaderGroups(readerGroups As Chilkat.StringTable) As Boolean
Introduced in version 9.50.87

Returns a list of currently available reader groups on the system. The reader groups are returned in readerGroups.

Returns True for success, False for failure.

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ListReaders
Function ListReaders(st As Chilkat.StringTable) As Boolean
Introduced in version 9.50.87

Returns a list of currently available readers on the system.

Returns True for success, False for failure.

More Information and Examples
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Reconnect
Function Reconnect(shareMode As String, preferredProtocol As String, action As String) As Boolean
Introduced in version 9.50.87

Reestablishes a connection to a reader that was previously connected to using Connect().

In a multi application environment it is possible for an application to reset the card in shared mode. When this occurs any other application trying to access certain commands will be returned the value SCARD_W_RESET_CARD. When this occurs Reconnect() must be called in order to acknowledge that the card was reset and allow it to change its state accordingly.

The shareMode can be shared, exclusive, or direct. The preferredProtocol can be 0 (valid only if the shareMode = direct), T0, T1, raw, or no_preference. (No preference is effectively T0 or T1.) The action is the desired action taken on the card/reader. It can be leave, reset, unpower, or eject.

If successful, the state of this object instance is that it's connected to the reader.

Returns True for success, False for failure.

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ReleaseContext
Function ReleaseContext() As Boolean
Introduced in version 9.50.87

Destroys a communication context to the PC/SC Resource Manager. This must be the last function called in a PC/SC application.

Returns True for success, False for failure.

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SendControl
Function SendControl(controlCode As UInt32, bdSend As Chilkat.BinData, bdRecv As Chilkat.BinData) As Boolean
Introduced in version 9.50.87

Sends a command directly to the IFD Handler (reader driver) to be processed by the reader.

This is useful for creating client side reader drivers for functions like PIN pads, biometrics, or other extensions to the normal smart card reader that are not normally handled by PC/SC.

The command data is sent in bdSend. The response is written to bdRecv.

Returns True for success, False for failure.

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SendControlHex
Function SendControlHex(controlCode As UInt32, sendData As String, bdRecv As Chilkat.BinData) As Boolean
Introduced in version 9.50.87

Sends a command directly to the IFD Handler (reader driver) to be processed by the reader.

This is useful for creating client side reader drivers for functions like PIN pads, biometrics, or other extensions to the normal smart card reader that are not normally handled by PC/SC.

The command data is provided as a hex string in sendData. The response is written to bdRecv.

Returns True for success, False for failure.

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Transmit
Function Transmit(protocol As String, bdSend As Chilkat.BinData, bdRecv As Chilkat.BinData, maxRecvLen As Int32) As Boolean
Introduced in version 9.50.87

Sends an APDU to the smart card contained in the currently connected reader. The protocol can be T0, T1, or raw. The APDU to be sent is contained in bdSend. The response from the card is contained in bdRecv. The maxRecvLen is the maximum response size (in bytes) willing to be accepted.

Returns True for success, False for failure.

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TransmitHex
Function TransmitHex(protocol As String, apduHex As String, bdRecv As Chilkat.BinData, maxRecvLen As Int32) As Boolean
Introduced in version 9.50.87

Sends an APDU to the smart card contained in the currently connected reader. The protocol can be T0, T1, or raw. The APDU (in hexadecimal) to be sent is passed in apduHex. The response from the card is contained in bdRecv. The maxRecvLen is the maximum response size (in bytes) willing to be accepted.

Returns True for success, False for failure.

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Events

To implement events, your application would define and implement a class that is a subclass of Chilkat.SCard. Your custom class would implement (i.e. override) some or all of the event methods.

For example:

class MySCard
    Inherits Chilkat.SCard

    Function AbortCheck() As Boolean

    Function PercentDone(pctDone As Int32) As Boolean

    Sub ProgressInfo(name As String, value As String)

    Sub TaskCompleted(task As Chilkat.Task)


End Class
AbortCheck
Function AbortCheck() As Boolean

Enables a method call to be aborted by triggering the AbortCheck event at intervals defined by the HeartbeatMs property. If HeartbeatMs is set to its default value of 0, no events will occur. For instance, set HeartbeatMs to 200 to trigger 5 AbortCheck events per second.

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PercentDone
Function PercentDone(pctDone As Int32) As Boolean

This provides the percentage completion for any method involving network communications or time-consuming processing, assuming the progress can be measured as a percentage. This event is triggered only when it's possible and logical to express the operation's progress as a percentage. The pctDone argument will range from 1 to 100. For methods that finish quickly, the number of PercentDone callbacks may vary, but the final callback will have pctDone equal to 100. For longer operations, callbacks will not exceed one per percentage point (e.g., 1, 2, 3, ..., 98, 99, 100).

The PercentDone callback also acts as an AbortCheck event. For fast methods where PercentDone fires, an AbortCheck event may not trigger since the PercentDone callback already provides an opportunity to abort. For longer operations, where time between PercentDone callbacks is extended, AbortCheck callbacks enable more responsive operation termination.

To abort the operation, set the abort output argument to True. This will cause the method to terminate and return a failure status or corresponding failure value.

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ProgressInfo
Sub ProgressInfo(name As String, value As String)

This event callback provides tag name/value pairs that detail what occurs during a method call. To discover existing tag names, create code to handle the event, emit the pairs, and review them. Most tag names are self-explanatory.

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TaskCompleted
Sub TaskCompleted(task As Chilkat.Task)

Called from the background thread when an asynchronous task completes.

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