SCardForgetReaderGroupA function (winscard.h)

Article
11/20/2024

The SCardForgetReaderGroup function removes a previously introduced smart card reader group from the smart card subsystem. Although this function automatically clears all readers from the group, it does not affect the existence of the individual readers in the database.

Syntax

LONG SCardForgetReaderGroupA(
  [in] SCARDCONTEXT hContext,
  [in] LPCSTR       szGroupName
);

Parameters

[in] hContext

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

[in] szGroupName

Display name of the reader group to be removed. System-defined reader groups cannot be removed from the database.

Value	Meaning
SCARD_ALL_READERS TEXT("SCard$AllReaders\000")	Group used when no group name is provided when listing readers. Returns a list of all readers, regardless of what group or groups the readers are in.
SCARD_DEFAULT_READERS TEXT("SCard$DefaultReaders\000")	Default group to which all readers are added when introduced into the system.
SCARD_LOCAL_READERS TEXT("SCard$LocalReaders\000")	Unused legacy value. This is an internally managed group that cannot be modified by using any reader group APIs. It is intended to be used for enumeration only.
SCARD_SYSTEM_READERS TEXT("SCard$SystemReaders\000")	Unused legacy value. This is an internally managed group that cannot be modified by using any reader group APIs. It is intended to be used for enumeration only.

Return value

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

Return code	Description
Success	SCARD_S_SUCCESS.
Failure	An error code. For more information, see Smart Card Return Values.

Remarks

The SCardForgetReaderGroup function is a database management function. For more information on other database management functions, see Smart Card Database Management Functions.

Examples

The following example shows how to remove a reader group from the system. The example assumes that lReturn is an existing variable of type LONG, and that hContext is a valid handle to a resource manager context previously obtained from a call to the SCardEstablishContext function.


lReturn = SCardForgetReaderGroup(hContext, 
                                 L"MyReaderGroup");
if ( SCARD_S_SUCCESS != lReturn )
    printf("Failed SCardForgetReaderGroup\n");

Note

The winscard.h header defines SCardForgetReaderGroup as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement	Value
Minimum supported client	Windows XP [desktop apps only]
Minimum supported server	Windows Server 2003 [desktop apps only]
Target Platform	Windows
Header	winscard.h
Library	Winscard.lib
DLL	Winscard.dll

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