TChilkatSCard Delphi ActiveX Reference Documentation

TChilkatSCard

Current Version: 9.5.0.88

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.

Importing the Chilkat ActiveX into Delphi

Important: When upgrading to a new version of Chilkat, make sure to re-imported ActiveX DLL into Delphi to regenerate the files described below.

Two things are required to use an ActiveX in Delphi:

  1. The ActiveX DLL needs to be registered via regsvr32 on the system where the Delphi application runs. See How To Register ActiveX DLLs for detailed information.
  2. See also: ActiveX Registration Tutorial
  3. The ActiveX component needs to be "imported". Use the Delphi Import Component Wizard to import the Chilkat type library. This creates the following files: Chilkat_v9_5_0_TLB.pas and Chilkat_v9_5_0_TLB.dcr. The Chilkat_v9_5_0_TLB.pas should be added to your project.

To import the Chilkat type library, do the following:

  1. In the Delphi RAD Studio, select the menu item "Component" --> "Import a Type Library".
  2. Find "Chilkat ActiveX v9.5.0" in the list and select it. This will only appear in the list if the ChilkatAx-9.5.0-win32.dll (or ChilkatAx-9.5.0-x64.dll) has been registered w/ regsvr32.
  3. Check the "Generate Component Wrappers" checkbox.
  4. Select a directory where the unit files (.pas and .dcr) should be generated.
  5. Select "Create Unit" and then "Finish".
  6. Add the .pas to your Delphi project.

To use a Chilkat ActiveX object in your Delphi code, add "Chilkat_v9_5_0_TLB" to the "uses" statement. For example:

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_v9_5_0_TLB;

Object Creation

var
obj: TChilkatSCard;
...
begin
obj := TChilkatSCard.Create(Self);
...
// When finished, free the object instance.
obj.Free();

Properties

ActiveProtocol
property ActiveProtocol: WideString readonly
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
property CardAtr: WideString readonly
Introduced in version 9.50.87

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

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ConnectedReader
property ConnectedReader: WideString readonly
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
property Context: WideString readonly
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
property DebugLogFilePath: WideString

If set to a file path, causes each Chilkat method or property call to automatically append it's LastErrorText to the specified log file. The information is appended such that if a hang or crash occurs, it is possible to see the context in which the problem occurred, as well as a history of all Chilkat calls up to the point of the problem. The VerboseLogging property can be set to provide more detailed information.

This property is typically used for debugging the rare cases where a Chilkat method call hangs or generates an exception that halts program execution (i.e. crashes). A hang or crash should generally never happen. The typical causes of a hang are:

  1. a timeout related property was set to 0 to explicitly indicate that an infinite timeout is desired,
  2. the hang is actually a hang within an event callback (i.e. it is a hang within the application code), or
  3. there is an internal problem (bug) in the Chilkat code that causes the hang.

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LastBinaryResult
property LastBinaryResult: OleVariant readonly
Introduced in version 9.5.0.52

The binary data returned by the last (binary data returning) method called. Only available if Chilkat.Global.KeepBinaryResult is set to 1. This provides a means for obtaining large varbinary results in the SQL Server environment (where limitations exist in getting large amounts of data returned by method calls, but where temp tables can be used for binary properties).

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LastErrorHtml
property LastErrorHtml: WideString readonly

Provides information in HTML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorText
property LastErrorText: WideString readonly

Provides information in plain-text format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastErrorXml
property LastErrorXml: WideString readonly

Provides information in XML format about the last method/property called. If a method call returns a value indicating failure, or behaves unexpectedly, examine this property to get more information.

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LastMethodSuccess
property LastMethodSuccess: Integer
Introduced in version 9.5.0.52

Indicate whether the last method call succeeded or failed. A value of 1 indicates success, a value of 0 indicates failure. This property is automatically set for method calls. It is not modified by property accesses. The property is automatically set to indicate success for the following types of method calls:

  • Any method that returns a string.
  • Any method returning a Chilkat object, binary bytes, or a date/time.
  • Any method returning a standard boolean status value where success = 1 and failure = 0.
  • Any method returning an integer where failure is defined by a return value less than zero.

Note: Methods that do not fit the above requirements will always set this property equal to 1. For example, a method that returns no value (such as a "void" in C++) will technically always succeed.

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LastStringResult
property LastStringResult: WideString readonly
Introduced in version 9.5.0.52

The string return value of the last (string returning) method called. Only available if Chilkat.Global.KeepStringResult is set to 1. This provides a means for obtaining large string results in the SQL Server environment (where limitations exist in getting long strings returned by method calls, but where temp tables can be used for string properties).

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LastStringResultLen
property LastStringResultLen: Integer readonly
Introduced in version 9.5.0.53

The length, in characters, of the string contained in the LastStringResult property.

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PcscLibPath
property PcscLibPath: WideString
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
property ReaderStatus: WideString readonly
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
property ScardError: WideString readonly
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
property VerboseLogging: Integer

If set to 1, then the contents of LastErrorText (or LastErrorXml, or LastErrorHtml) may contain more verbose information. The default value is 0. Verbose logging should only be used for debugging. The potentially large quantity of logged information may adversely affect peformance.

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Version
property Version: WideString readonly

Version of the component/library, such as "9.5.0.63"

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Methods

BeginTransaction
function BeginTransaction(): Integer;
Introduced in version 9.50.87

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

Returns 1 for success, 0 for failure.

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CheckStatus
function CheckStatus(): Integer;
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 0, none of the properties are updated.

Returns 1 for success, 0 for failure.

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Connect
function Connect(reader: WideString; shareMode: WideString; preferredProtocol: WideString): Integer;
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 1 for success, 0 for failure.

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Disconnect
function Disconnect(disposition: WideString): Integer;
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 1 for success, 0 for failure.

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EndTransaction
function EndTransaction(disposition: WideString): Integer;
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 1 for success, 0 for failure.

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EstablishContext
function EstablishContext(scope: WideString): Integer;
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 1 for success, 0 for failure.

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FindSmartcards
function FindSmartcards(json: TChilkatJsonObject): Integer;
Introduced in version 9.50.87

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

Returns 1 for success, 0 for failure.

More Information and Examples
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GetAttrib
function GetAttrib(attr: WideString; bd: TChilkatBinData): Integer;
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 1 for success, 0 for failure.

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GetAttribStr
function GetAttribStr(attr: WideString): WideString;
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 a zero-length WideString on failure

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GetAttribUint
function GetAttribUint(attr: WideString): Integer;
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: Integer; stReaderNames: TChilkatStringTable; json: TChilkatJsonObject): Integer;
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 1 for success, 0 for failure.

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GetStatusChangeAsync (1)
function GetStatusChangeAsync(maxWaitMs: Integer; stReaderNames: TChilkatStringTable; json: TChilkatJsonObject): TChilkatTask;
Introduced in version 9.50.87

Creates an asynchronous task to call the GetStatusChange method with the arguments provided. (Async methods are available starting in Chilkat v9.5.0.52.)

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(): Integer;
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 1 for success, 0 for failure.

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ListReaderGroups
function ListReaderGroups(readerGroups: TChilkatStringTable): Integer;
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 1 for success, 0 for failure.

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ListReaders
function ListReaders(st: TChilkatStringTable): Integer;
Introduced in version 9.50.87

Returns a list of currently available readers on the system.

Returns 1 for success, 0 for failure.

More Information and Examples
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Reconnect
function Reconnect(shareMode: WideString; preferredProtocol: WideString; action: WideString): Integer;
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 1 for success, 0 for failure.

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ReleaseContext
function ReleaseContext(): Integer;
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 1 for success, 0 for failure.

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SendControl
function SendControl(controlCode: Integer; bdSend: TChilkatBinData; bdRecv: TChilkatBinData): Integer;
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 1 for success, 0 for failure.

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SendControlHex
function SendControlHex(controlCode: Integer; sendData: WideString; bdRecv: TChilkatBinData): Integer;
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 1 for success, 0 for failure.

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Transmit
function Transmit(protocol: WideString; bdSend: TChilkatBinData; bdRecv: TChilkatBinData; maxRecvLen: Integer): Integer;
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 1 for success, 0 for failure.

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TransmitHex
function TransmitHex(protocol: WideString; apduHex: WideString; bdRecv: TChilkatBinData; maxRecvLen: Integer): Integer;
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 1 for success, 0 for failure.

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Events

AbortCheck
procedure AbortCheck(ASender: TObject; out abort: Integer);

Provides the opportunity for a method call to be aborted. The AbortCheck event is fired periodically based on the value of the HeartbeatMs property. If HeartbeatMs is 0, then no AbortCheck events will fire. As an example, to fire 5 AbortCheck events per second, set the HeartbeatMs property equal to 200.

Delphi ActiveX Event callback implementation:

procedure TForm1.scardAbortCheck(ASender: TObject;  out abort: Integer);
begin
    // Application code goes here...
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  scard: TChilkatSCard;

begin
  scard := TChilkatSCard.Create(Self);
  scard.OnAbortCheck := scardAbortCheck;
  // ...
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PercentDone
procedure PercentDone(ASender: TObject; pctDone: Integer; out abort: Integer);

Provides the percentage completed for any method that involves network communications or time-consuming processing (assuming it is a method where a percentage completion can be measured). This event is only fired when it is possible to know a percentage completion, and when it makes sense to express the operation as a percentage completed. The pctDone argument will have a value from 1 to 100. For operations (Chilkat method calls) that complete very quickly, the number of PercentDone callbacks will vary, but the final callback should have a value of 100. For long running operations, no more than one callback per percentage point will occur (for example: 1, 2, 3, ... 98, 99, 100).

The PercentDone callback counts as an AbortCheck event. For method calls that complete quickly such that PercentDone events fire, it may be that AbortCheck events don't fire because the opportunity to abort is already provided in the PercentDone callback. For time consuming operations, where the amount of time between PercentDone callbacks are long, AbortCheck callbacks may be used to allow for the operation to be aborted in a more responsive manner.

The abort output argument provides a means for aborting the operation. Setting it to 1 will cause the method to abort and return a failed status (or whatever return value indicates failure).

Delphi ActiveX Event callback implementation:

procedure TForm1.scardPercentDone(ASender: TObject;  pctDone: Integer; out abort: Integer);
begin
    // Application code goes here...
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  scard: TChilkatSCard;

begin
  scard := TChilkatSCard.Create(Self);
  scard.OnPercentDone := scardPercentDone;
  // ...
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ProgressInfo
procedure ProgressInfo(ASender: TObject; const name: WideString; const value: WideString);

A general name/value event that provides information about what is happening during a method call. To find out what information is available, write code to handle this event and log the name/value pairs. Most are self-explanatory.

Delphi ActiveX Event callback implementation:

procedure TForm1.scardProgressInfo(ASender: TObject;  const name: WideString; const value: WideString);
begin
    // Application code goes here...
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  scard: TChilkatSCard;

begin
  scard := TChilkatSCard.Create(Self);
  scard.OnProgressInfo := scardProgressInfo;
  // ...
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TaskCompleted
procedure TaskCompleted(ASender: TObject; const task: IChilkatTask);

Called in the background thread when an asynchronous task completes.

More Information and Examples

Delphi ActiveX Event callback implementation:

procedure TForm1.scardTaskCompleted(ASender: TObject;  const task: IChilkatTask);
begin
    // Application code goes here...
end;


procedure TForm1.Button1Click(Sender: TObject);
var
  scard: TChilkatSCard;

begin
  scard := TChilkatSCard.Create(Self);
  scard.OnTaskCompleted := scardTaskCompleted;
  // ...
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