ISCardCmd::get_P3 method

[The get_P3 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 get_P3 method retrieves the third parameter (P3) byte from the application protocol data unit (APDU). This read-only byte value represents the size of the data portion of the APDU.

Syntax

HRESULT get_P3(
  [out] BYTE *pbyP3
);

Parameters

pbyP3 [out]

Pointer to the byte that is the P3 from the APDU on return.

Return value

The method returns one of the following possible values.

Remarks

The P3 parameter is read-only, and therefore cannot be set.

To get the P1 or P2 parameters, call get_P1 and get_P2 respectively.

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 retrieve the third parameter (P3) byte from the application protocol data unit (APDU). The example assumes that pISCardCmd is a valid pointer to an instance of the ISCardCmd interface.

BYTE  byP3;
HRESULT  hr;

// Retrieve the P3 byte.
hr = pISCardCmd->get_P3(&byP3);
if (FAILED(hr))
{
  printf("Failed get_P3\n");
  // Take other error handling action as needed.
}

Requirements

See also

get_P1

get_P2

ISCardCmd