ldap_search_st function (winldap.h)

The ldap_search_st function synchronously searches the LDAP directory and returns a requested set of attributes for each entry matched. An additional parameter specifies a local time-out for the search. The function is identical to ldap_search_s, except for the additional local time-out parameter.


  [in]  LDAP         *ld,
  [in]  PSTR         base,
  [in]  ULONG        scope,
  [in]  PSTR         filter,
  [in]  PZPSTR       attrs,
  [in]  ULONG        attrsonly,
  [in]  l_timeval    *timeout,
  [out] PLDAPMessage *res


[in] ld

Session handle.

[in] base

Pointer to a null-terminated string that contains the distinguished name of the entry at which to start the search.

[in] scope

Specifies one of the following values to indicate the search scope.


Search the base entry only.


Search all entries in the first level below the base entry, excluding the base entry.


Search the base entry and all entries in the tree below the base.

[in] filter

Pointer to a null-terminated string that specifies the search filter. For more information, see Search Filter Syntax.

[in] attrs

A null-terminated array of null-terminated strings that indicate which attributes to return for each matching entry. Pass NULL to retrieve all available attributes.

[in] attrsonly

Boolean value that must be zero if both attribute types and values are to be returned, nonzero if only types are required.

[in] timeout

The local search time-out value, in seconds.

[out] res

Contains the results of the search upon completion of the call. Can also contain partial results or extended data when the function call fails with an error code. Any results returned must be freed with a call to ldap_msgfree when no longer required by the application.

Return value

If the function succeeds, the return value is LDAP_SUCCESS.

If the function fails, it returns an error code, however ldap_search_st can fail and can still allocate pMsg. For example, both LDAP_PARTIAL_RESULTS and LDAP_REFERRAL error code allocate pMsg. For more information, see the following code example. For more information, see Return Values.


The ldap_search_st function initiates a synchronous search operation.

Use the ldap_set_option function with the ld session handle to set the LDAP_OPT_SIZELIMIT and LDAP_OPT_DEREF options that determine how the search is performed. For more information, see Session Options. The timeout parameter in ldap_search_st overrides the LDAP_OPT_TIMELIMIT.

Upon completion of the search operation, ldap_search_st returns to the caller. Use ldap_search or ldap_search_ext to have the operation performed asynchronously.

Multithreading: Calls to ldap_search_st are thread-safe.

The following code example shows how to free pMsg if ldap_search_st fails.

// Initialize return value to NULL.
LDAPMessage *pMsg = NULL;

// Perform the search request.
dwErr = ldap_search_st (i_pldap,

// Cleanup calling parameters.
if (lpszAttributes != NULL)
    delete [] lpszAttributes;

// Convert error code and cleanup pMsg if necessary.
if (dwErr != LDAP_SUCCESS)
    DebugOutLDAPError(i_pldap, dwErr, _T("ldap_search_st"));
    hr = HRESULT_FROM_WIN32(dwErr);

    // Be aware that pMsg can contain valid data, even if the
    // call to ldap_search_st returned an error code.  
    // This can be caused by the server returning codes,
    // such as LDAP_RESULTS_TOO_LARGE or other codes,
    // that indicate that the search returned partial
    // results. The user code can handle these cases
    // if required, this example just frees pMsg on any 
    // error code.

    if (pMsg != NULL)

    // Process the search results.
    // Free the results when complete.
    if (pMsg != NULL) ldap_msgfree(pMsg);


Minimum supported client Windows Vista
Minimum supported server Windows Server 2008
Target Platform Windows
Header winldap.h
Library Wldap32.lib
DLL Wldap32.dll

See also



Return Values

Session Options