WlanSetAutoConfigParameter function (wlanapi.h)

Article
10/13/2021

The WlanSetAutoConfigParameter function sets parameters for the automatic configuration service.

Syntax

DWORD WlanSetAutoConfigParameter(
  [in] HANDLE               hClientHandle,
  [in] WLAN_AUTOCONF_OPCODE OpCode,
  [in] DWORD                dwDataSize,
  [in] const PVOID          pData,
       PVOID                pReserved
);

Parameters

[in] hClientHandle

The client's session handle, obtained by a previous call to the WlanOpenHandle function.

[in] OpCode

A WLAN_AUTOCONF_OPCODE value that specifies the parameter to be set. Only some of the opcodes in the WLAN_AUTOCONF_OPCODE enumeration support set operations.

Value	Meaning
wlan_autoconf_opcode_show_denied_networks	When set, the pData parameter will contain a BOOL value indicating whether user and group policy-denied networks will be included in the available networks list.
wlan_autoconf_opcode_allow_explicit_creds	When set, the pData parameter will contain a BOOL value indicating whether the current wireless interface has shared user credentials allowed.
wlan_autoconf_opcode_block_period	When set, the pData parameter will contain a DWORD value for the blocked period setting for the current wireless interface. The blocked period is the amount of time, in seconds, for which automatic connection to a wireless network will not be attempted after a previous failure.
wlan_autoconf_opcode_allow_virtual_station_extensibility	When set, the pData parameter will contain a BOOL value indicating whether extensibility on a virtual station is allowed. By default, extensibility on a virtual station is allowed. The value for this opcode is persisted across restarts. This enumeration value is supported on Windows 7 and on Windows Server 2008 R2 with the Wireless LAN Service installed.

[in] dwDataSize

The size of the pData parameter, in bytes. This parameter must be set to sizeof(BOOL) for a BOOL or sizeof(DWORD) for a DWORD, depending on the value of the OpCode parameter.

[in] pData

The value to be set for the parameter specified in OpCode parameter. The pData parameter must point to a boolean or DWORD value, depending on the value of the OpCode parameter. The pData parameter must not be NULL.

Note The pData parameter may point to an integer value when a boolean is required. If pData points to 0, then the value is converted to FALSE. If pData points to a nonzero integer, then the value is converted to TRUE.

pReserved

Reserved for future use. Must be set to NULL.

Return value

If the function succeeds, the return value is ERROR_SUCCESS.

If the function fails, the return value may be one of the following return codes.

Return code	Description
ERROR_ACCESS_DENIED	Access is denied. This error is returned if the caller does not have sufficient permissions to set the configuration parameter when the OpCode parameter is wlan_autoconf_opcode_show_denied_networks or wlan_autoconf_opcode_allow_virtual_station_extensibility. When the OpCode parameter is set to one of these values, the WlanSetAutoConfigParameter function retrieves the discretionary access control list (DACL) stored for opcode object. If the DACL does not contain an access control entry (ACE) that grants WLAN_WRITE_ACCESS permission to the access token of the calling thread, then WlanSetAutoConfigParameter returns ERROR_ACCESS_DENIED. This error is also returned if the configuration parameter is set by group policy on a domain. When group policy is set for an opcode, applications are prevented from making changes. For the following OpCode parameters may be set by group policy: wlan_autoconf_opcode_show_denied_networks, wlan_autoconf_opcode_allow_explicit_creds, and wlan_autoconf_opcode_block_period
ERROR_INVALID_PARAMETER	A parameter was bad. This error is returned if the hClientHandle parameter is NULL, the pData parameter is NULL, or the pReserved parameter is not NULL. This error is also returned if OpCode parameter specified is not one of the WLAN_AUTOCONF_OPCODE values for a configuration parameter that can be set. This error is also returned if the dwDataSize parameter is not set to `sizeof(BOOL)`, or the dwDataSize is not set to `sizeof(BOOL)` depending on the value of the OpCode parameter.
ERROR_INVALID_HANDLE	The handle hClientHandle was not found in the handle table.
ERROR_NOT_SUPPORTED	This function was called from an unsupported platform. This value will be returned if this function was called from a Windows XP with SP3 or Wireless LAN API for Windows XP with SP2 client.
RPC_STATUS	Various error codes.

Remarks

The WlanSetAutoConfigParameter function sets parameters used by Auto Configuration Module (ACM), the wireless configuration component supported on Windows Vista and later.

Depending on the value of the OpCode parameter, the data pointed to by pData will be converted to a boolean value before the automatic configuration parameter is set. If pData points to 0, then the parameter is set to FALSE; otherwise, the parameter is set to TRUE.

Requirements

Requirement	Value
Minimum supported client	Windows Vista [desktop apps only]
Minimum supported server	Windows Server 2008 [desktop apps only]
Target Platform	Windows
Header	wlanapi.h (include Wlanapi.h)
Library	Wlanapi.lib
DLL	Wlanapi.dll