檢查查詢篩選語法

LDAP API 提供簡單的語法驗證函式。 請注意，它只會驗證語法，而不是篩選中指定的屬性是否存在。

下列函式會驗證查詢篩選的語法，如果篩選條件有效，則傳回S_OK，如果篩選無效，則傳回S_FALSE。

HRESULT CheckFilterSyntax(
    LPOLESTR szServer, // NULL binds to a DC in the current domain.
    LPOLESTR szFilter) // Filter to check.
{
HRESULT hr = S_OK;
DWORD dwReturn;
LDAP *hConnect = NULL;  // Connection handle
 
if (!szFilter)
  return E_POINTER;
 
// LDAP_PORT is the default port, 389
 
hConnect  = ldap_open(szServer,  LDAP_PORT);
 
// Bind using the preferred authentication method on Windows 2000
// and the calling thread's security context.
 
dwReturn = ldap_bind_s( hConnect, NULL, NULL, LDAP_AUTH_NEGOTIATE );
if (dwReturn==LDAP_SUCCESS) {
    dwReturn = ldap_check_filter(hConnect, szFilter);
    if (dwReturn==LDAP_SUCCESS)
        hr = S_OK;
    else
        hr = S_FALSE;
}
 
// Unbind to free the connection.
 
ldap_unbind( hConnect );
 
return hr;
}