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DhcpEnumOptionValues function

The DhcpEnumOptionValues function returns an enumerated list of option values (just the option data and the associated ID number) for a given scope.

Syntax


DWORD DHCP_API_FUNCTION DhcpEnumOptionValues(
  _In_     DHCP_CONST WCHAR *ServerIpAddress,
  _In_     DHCP_CONST DHCP_OPTION_SCOPE_INFO *ScopeInfo,
  _Inout_  DHCP_RESUME_HANDLE *ResumeHandle,
  _In_     DWORD PreferredMaximum,
  _Out_    LPDHCP_OPTION_VALUE_ARRAY *OptionValues,
  _Out_    DWORD *OptionsRead,
  _Out_    DWORD *OptionsTotal
);

Parameters

ServerIpAddress [in]

Unicode string that specifies the IP address or hostname of the DHCP server.

ScopeInfo [in]

DHCP_OPTION_SCOPE_INFO structure that contains the level (specifically: default, server, scope, or IPv4 reservation level) for which the option values are defined and should be enumerated.

ResumeHandle [in, out]

Pointer to a DHCP_RESUME_HANDLE value that identifies the enumeration operation. Initially, this value should be zero, with a successful call returning the handle value used for subsequent enumeration requests. For example, if PreferredMaximum is set to 1000 bytes, and 2000 bytes worth of option values are stored on the server, the resume handle can be used after the first 1000 bytes are retrieved to obtain the next 1000 on a subsequent call, and so forth.

The presence of additional enumerable data is indicated when this function returns ERROR_MORE_DATA. If no additional enumerable data is available on the DHCPv4 server, ERROR_NO_MORE_ITEMS is returned.

PreferredMaximum [in]

Specifies the preferred maximum number of bytes of option values to return. If the number of remaining unenumerated options (in bytes) is less than this value, then that amount will be returned.

To retrieve all the option values for the default user and vendor class at the specified level, set this parameter to 0xFFFFFFFF.

OptionValues [out]

Pointer to a DHCP_OPTION_VALUE_ARRAY structure that contains the enumerated option values returned for the specified scope. If there are no option values available for this scope on the DHCP server, this parameter will return null.

OptionsRead [out]

Pointer to a DWORD value that specifies the number of option values returned in OptionValues.

OptionsTotal [out]

Pointer to a DWORD value that specifies the total number of remaining option values for this scope stored on the DHCP server.

Return value

This function returns ERROR_SUCCESS upon a successful call. Otherwise, it returns one of the DHCP Server Management API Error Codes.

Return codeDescription
ERROR_DHCP_JET_ERROR

An error occurred while accessing the DHCP server database.

ERROR_MORE_DATA

There are more elements available to enumerate.

ERROR_NO_MORE_ITEMS

There are no more elements left to enumerate.

ERROR_DHCP_SUBNET_NOT_PRESENT

The specified IPv4 subnet does not exist on the DHCP server.

ERROR_DHCP_NOT_RESERVED_CLIENT

The specified DHCPv4 client is not an IPv4 reserved client.

 

Requirements

Minimum supported client

None supported

Minimum supported server

Windows Server 2008 R2 [desktop apps only]

Header

Dhcpsapi.h

Library

Dhcpsapi.lib

DLL

Dhcpsapi.dll

See also

DhcpEnumOptionValuesV5
DHCP_OPTION_VALUE_ARRAY

 

 

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