ISCardCmd::get_P2 method

Artikkel
01/07/2021

[The get_P2 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_P2 method retrieves the second parameter (P2) byte from the application protocol data unit (APDU).

Syntax

HRESULT get_P2(
  [out] BYTE *pbyP2
);

Parameters

pbyP2 [out]: Pointer to the byte that is the P2 from the APDU on return.

Return value

The method returns one of the following possible values.

Return code	Description
S_OK	Operation completed successfully.
E_INVALIDARG	The pbyP2 parameter is not valid.
E_POINTER	A bad pointer was passed in pbyP2.
E_OUTOFMEMORY	Out of memory.

Remarks

To set the P2 parameter to a new value, call put_P2.

To get the P1 or P3 parameters, call get_P1 and get_P3 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 second parameter (P2) 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  byP2;
HRESULT  hr;

// Retrieve the P2 byte.
hr = pISCardCmd->get_P2(&byP2);
if (FAILED(hr))
{
  printf("Failed get_P2\n");
  // Take other error handling action as needed.
}

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
End of client support	Windows XP
End of server support	Windows Server 2003
Header	Scarddat.h
Type library	Scarddat.tlb
DLL	Scardssp.dll
IID	IID_ISCardCmd is defined as D5778AE3-43DE-11D0-9171-00AA00C18068

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