ISCard::get_Protocol method

Стаття
01/07/2021

[The get_Protocol 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_Protocol method retrieves the identifier of the protocol currently in use on the smart card.

Syntax

HRESULT get_Protocol(
  [out] SCARD_PROTOCOLS *pProtocol
);

Parameters

pProtocol [out]: Pointer to the protocol identifier.

Return value

The method returns one of the following possible values.

Return code	Description
S_OK	Operation completed successfully.
E_INVALIDARG	The pProtocol parameter is not valid.
E_POINTER	A bad pointer was passed in pProtocol.

Remarks

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 retrieving the identifier of the protocol currently in use on the smart card.

SCARD_PROTOCOLS   scProtocol;
HRESULT           hr;

// Retrieve the protocol.
hr = pISCard->get_Protocol(&scProtocol);
if (FAILED(hr))
{
   printf("Failed get_Protocol\n");
   // Take other error handling action as needed.
}
// Use the retrieved protocol. (This example merely displays it.)
switch (scProtocol)
{
    case T0:
        printf("T0 protocol\n");
        break;
    case T1:
        printf("T1 protocol\n");
        break;
    default:
        printf("Other protocol\n");
        break;
}

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	Scardmgr.h
Type library	Scardmgr.tlb
DLL	Scardssp.dll
IID	IID_ISCard is defined as 1461AAC3-6810-11D0-918F-00AA00C18068

Поділитися через