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SCardListInterfaces function

The SCardListInterfaces function provides a list of interfaces supplied by a given card.

The caller supplies the name of a smart card previously introduced to the subsystem, and receives the list of interfaces supported by the card.

Syntax


LONG WINAPI SCardListInterfaces(
  _In_     SCARDCONTEXT hContext,
  _In_     LPCTSTR szCard,
  _Out_    LPGUID pguidInterfaces,
  _Inout_  LPDWORD pcguidInterfaces
);

Parameters

hContext [in]

Handle that identifies the resource manager context for the query. The resource manager context can be set by a previous call to SCardEstablishContext. This parameter cannot be NULL.

szCard [in]

Name of the smart card already introduced to the smart card subsystem.

pguidInterfaces [out]

Array of interface identifiers (GUIDs) that indicate the interfaces supported by the smart card. If this value is NULL, SCardListInterfaces ignores the array length supplied in pcguidInterfaces, returning the size of the array that would have been returned if this parameter had not been NULL to pcguidInterfaces and a success code.

pcguidInterfaces [in, out]

Size of the pcguidInterfaces array, and receives the actual size of the returned array. If the array size is specified as SCARD_AUTOALLOCATE, then pcguidInterfaces is converted to a pointer to a GUID pointer, and receives the address of a block of memory containing the array. This block of memory must be deallocated with SCardFreeMemory.

Return value

This function returns different values depending on whether it succeeds or fails.

Return codeDescription
Success

SCARD_S_SUCCESS.

Failure

An error code. For more information, see Smart Card Return Values.

 

Remarks

This function is not redirected, but calling the function when attempting a Remote Desktop session will not result in an error. It only means that the result will be from the remote computer instead of the local computer.

The SCardListInterfaces function is a database query function. For more information on other database query functions, see Smart Card Database Query Functions.

Examples

The following example shows listing the interfaces for a smart card.


LPGUID          pGuids = NULL;
LONG            lReturn;
DWORD           cGuid = SCARD_AUTOALLOCATE;

// Retrieve the list of interfaces.
lReturn = SCardListInterfaces(NULL,
                              (LPCSTR) "MyCard",
                              (LPGUID)&pGuids,
                              &cGuid );
if ( SCARD_S_SUCCESS != lReturn )
{
    printf("Failed SCardListInterfaces\n");
    exit(1);   // Or other appropriate action
}

if ( 0 != cGuid )
{
    // Do something with the array of Guids.
    // Remember to free pGuids when done (by SCardFreeMemory).
    // ...
}


Requirements

Minimum supported client

Windows XP [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

Winscard.h

Library

Winscard.lib

DLL

Winscard.dll

Unicode and ANSI names

SCardListInterfacesW (Unicode) and SCardListInterfacesA (ANSI)

See also

SCardEstablishContext
SCardFreeMemory
SCardGetProviderId
SCardListCards
SCardListReaderGroups
SCardListReaders

 

 

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