ISCard::AttachByReader method

Artikel
01/07/2021

[The AttachByReader 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 AttachByReader method opens the smart card in the named reader.

Syntax

HRESULT AttachByReader(
  [in] BSTR              bstrReaderName,
  [in] SCARD_SHARE_MODES ShareMode,
  [in] SCARD_PROTOCOLS   PrefProtocol
);

Parameters

bstrReaderName [in]

A BSTR that contains the name of the smart card reader.

ShareMode [in]

Mode in which to claim access to the smart card.

Value	Meaning
EXCLUSIVE	No one else use this connection to the smart card.
SHARED	Other applications can use this connection.

PrefProtocol [in]

Preferred protocol value.

T0
T1
RAW
T0|T1

Return value

The method returns one of the following possible values.

Return code	Description
S_OK	Open on the smart card in the named reader has been completed successfully.
E_INVALIDARG	There is something wrong with one or more of the parameters passed into the function.

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.

When you have finished using the reader, release the attachment by calling the ISCard::Detach method.

Examples

The following example shows attaching to a smart card in a specified smart card reader.

#include <windows.h>
#include <stdio.h>
#include <Scardmgr.h>

// The reader name is vendor specific; change as needed.
#define READER_NAME L"Vendor Reader 0"

void main()
{
    BSTR     bstrReader = NULL;
    HRESULT  hr;

    bstrReader = SysAllocString(READER_NAME);
    if (NULL == bstrReader)
    {
        // Error encountered.
        exit(1);
    }

    // Connect to the reader.
    hr = pISCard->AttachByReader(bstrReader, SHARED, T0);
    if (FAILED(hr))
    {
        printf("Failed AttachByReader\n");
        // Take other error handling action.
        // ...
    }

    // Detach reader by calling ISCard::Detach (not shown).
    // ...

    // When done, free BSTR.
    if (NULL != bstrReader)
        SysFreeString(bstrReader);
}

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

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