Platform SDK: Network Management

NetLocalGroupEnum

The NetLocalGroupEnum function returns information about each local group account on the specified server.

Security Requirements

Windows NT: No special group membership is required to successfully execute the NetLocalGroupEnum function.

Windows 2000: If you call this function on a Windows 2000 domain controller that is running Active Directory, access is allowed or denied based on the access-control list (ACL) for the securable object. The default ACL permits all authenticated users and members of the "Pre-Windows 2000 compatible access" group to view the information. By default, the "Pre-Windows 2000 compatible access" group includes Everyone as a member. This enables anonymous access to the information if the system allows anonymous access.

If you call this function on a Windows 2000 member server or workstation, all authenticated users can view the information. Anonymous access is also permitted if the RestrictAnonymous policy setting allows anonymous access.

For more information about restricting anonymous access, see Security Requirements for the Network Management Functions.

NET_API_STATUS NetLocalGroupEnum(
  LPCWSTR servername,      
  DWORD level,             
  LPBYTE *bufptr,          
  DWORD prefmaxlen,        
  LPDWORD entriesread,     
  LPDWORD totalentries,    
  PDWORD_PTR resumehandle  
);

Parameters

servername

[in] Pointer to a constant Unicode string specifying the name of the remote server on which the function is to execute. The string must begin with \\. If this parameter is NULL, the local computer is used.

level

[in] Specifies the information level of the data. This parameter can be one of the following values.

Value	Meaning
0	Return local group names. The bufptr parameter points to an array of LOCALGROUP_INFO_0 structures.
1	Return local group names and the comment associated with each group. The bufptr parameter points to an array of LOCALGROUP_INFO_1 structures.

bufptr

[out] Pointer to the address of the buffer that receives the information structure. The format of this data depends on the value of the level parameter. This buffer is allocated by the system and must be freed using the NetApiBufferFree function. Note that you must free the buffer even if the function fails with ERROR_MORE_DATA.

prefmaxlen

[in] Specifies the preferred maximum length of returned data, in bytes. If you specify MAX_PREFERRED_LENGTH, the function allocates the amount of memory required for the data. If you specify another value in this parameter, it can restrict the number of bytes that the function returns. If the buffer size is insufficient to hold all entries, the function returns ERROR_MORE_DATA. For more information, see Network Management Function Buffers and Network Management Function Buffer Lengths.

entriesread

[out] Pointer to a DWORD value that receives the count of elements actually enumerated.

totalentries

[out] Pointer to a DWORD value that receives the approximate total number of entries that could have been enumerated from the current resume position. For more information, see the following Remarks section.

resumehandle

[in/out] Pointer to a value that contains a resume handle that is used to continue an existing local group search. The handle should be zero on the first call and left unchanged for subsequent calls. If this parameter is NULL, then no resume handle is stored. For more information, see the following Remarks section.

Return Values

If the function succeeds, the return value is NERR_Success.

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

Value	Meaning
ERROR_ACCESS_DENIED	The user does not have access to the requested information.
ERROR_MORE_DATA	More entries are available. Specify a large enough buffer to receive all entries.
NERR_InvalidComputer	The computer name is invalid.
NERR_BufTooSmall	The return buffer is too small.

Remarks

To determine the exact total number of local groups, you must enumerate the entire tree, which can be a costly operation. To enumerate the entire tree, use the resumehandle parameter to continue the enumeration for consecutive calls, and use the entriesread parameter to accumulate the total number of local groups.

If you are programming for Active Directory, you may be able to call certain Active Directory Service Interface (ADSI) methods to achieve the same functionality you can achieve by calling the network management local group functions. For more information, see IADsGroup.

Requirements