ISCardCmd::BuildCmd method

[The BuildCmd method is available for use in the operating systems specified in the Requirements section. It is not available for use in Windows Server 2003 with Service Pack 1 (SP1) and later, Windows Vista, Windows Server 2008, and subsequent versions of the operating system. The Smart Card Modules provide similar functionality.]

The BuildCmd method constructs a valid command application protocol data unit (APDU) for transmission to a smart card.

Syntax

HRESULT BuildCmd(
  [in] BYTE         byClassId,
  [in] BYTE         byInsId,
  [in] BYTE         byP1,
  [in] BYTE         byP2,
  [in] LPBYTEBUFFER pbyData,
  [in] LONG         *p1Le
);

Parameters

byClassId [in]

Command class identifier.

byInsId [in]

Command instruction identifier.

byP1 [in]

Command's first parameter.

byP2 [in]

Command's second parameter.

pbyData [in]

Pointer to the data portion of the command.

p1Le [in]

Pointer to a LONG integer containing the expected length of the returned data.

Return value

The method returns one of the following possible values.

Remarks

To encapsulate the command into another command, call Encapsulate.

For a list of all the methods provided by this interface, see ISCardCmd.

In addition to the COM error codes listed above, this interface may return a smart card error code if a smart card function was called to complete the request. For more information, see Smart Card Return Values.

Examples

The following example shows how to construct a command APDU. The example assumes that pISCardCmd is a valid pointer to an instance of the ISCardCmd interface and that pIByteRequest is a valid pointer to an instance of the IByteBuffer interface initialized with a previous call to the IByteBuffer::Initialize method.

LONG       lLe = 0;
HRESULT    hr;

hr = pISCardCmd->BuildCmd(0x00,   // Some cards prefer 0xC0
                          0xa4,   // 'Select File'
                          0x00,
                          0x00,
                          pIByteRequest,
                          &lLe);
if (FAILED(hr))
{
    printf("Failed ISCardCmd::BuildCmd\n");
    // Take other error handling action as needed.
}

Requirements

See also

Encapsulate

ISCardCmd