ActiveXperts Network Component

Quicklinks

HTML Form SNMP Sample Source Code

Network Component provides an easy-to-use development interface to a variety of IP protocols. By using Network Component, you can very easily create or enhance applications with network features.

Network Component features the following: DNS, FTP, HTTP, HTTPs, ICMP Ping, IP-to-Country, MSN, NTP, RSH, SCP, SFTP, SNMP v1/v2c (Get, GetNext, Set), SNMP Traps, SNMP MIB, SSH, TCP, Telnet, TFTP, UDP, Telnet, Wake-On-LAN and more.

Network Component can be well integrated into any development platform that supports ActiveX objects.


SNMP can be well integrated into ASP .NET (Visual Basic) environments.

This document describes how Network Component's SNMP objects can be integrated into ASP .NET (Visual Basic) projects.

Network Component is compliant with SNMP v1 and SNMP v2c. Different SNMP data types are supported, including:

  • String types (also called "octet strings");
  • Integer types (16bit, 32bit, 64bit and unsigned integers);
  • IP Address types;
  • Timetick types;
  • Counter types (32bit and 64bit counters);
  • OID types (also called "Object ID's");
  • Other, less frequently used datatypes.

The following operations are supported:

  • Get - retrieve an object variable from the (remote) agent;
  • GetNext - retrieve the next object variable from a table or list within an agent;
  • Set - set values for object variables within an agent.

Step 1: Installation of Network Component

Download Network Component from the ActiveXperts Download Site and start the installation. The installation guides you through the installation process.

When using HTML, there are two ways to install the Network Component on a client PC:

  • Automatically using HTML code;
  • Using the Network Component InstallShield installation.

Automatic installation using HTML code

You can install the Network Component automatically using the following HTML code on top of the HTML page:

<head>
  <object codebase="http://www.activexperts.com/files/network-component/3.1/AxNetwork32.cab" 
           classid="CLSID:B52B14BA-244B-4006-86E0-2923CB69D881" ></object>
</head>

The Network Component will be installated automatically. The user will be asked to confirm the installation, because the DLL is coming from an untrusted site (www.activexperts.com).

There are two ways to avoid prompting:

  • Add the ActiveX/COM location to the user's trusted sites. You can manage trusted manually (by using the Internet Explorer), through a logon script (by appyling the registry change from the logon script) or by using Active Directory Group Policies;
  • OR use a trusted location for the DLL. For instance your Intranet site, because most probably this site has already been added to the list of trusted sites for all users.

Manual installation using the Network Component installation procedure

On each client PC, download the Network Component from the ActiveXperts Download Site and start the installation. The installation guides you through the installation process.

Step 2: Create the Network Component object in HTML/JavaScript

You must use Javascript to declare and create the objects.

Use the following Javascript code to declare and create the object:

var objSftp;
objSnmp  = new ActiveXObject ( "AxNetwork.Snmp" );

Appendix: Full source code

<object codebase="http://www.activexperts.com/files/network-component/cab/4.4/axnetwork32.cab" classid="CLSID:B52B14BA-244B-4006-86E0-2923CB69D881" style="visibility: hidden;"></object>

<html>

<head>
<title>ActiveXperts Network Component Sample - SNMP Get/GetNext</title>
<style>
   .clbody {
   font-family:Verdana, Arial, Helvetica, sans-serif;
   font-size:9pt;
   font-weight:normal;
}
.clfooter {
   font-family:Verdana;
   font-size:7pt;
   font-weight:normal;
}
h1, .h1 {
   width:100%;
   font-family:Verdana, Arial, Helvetica, sans-serif;
   font-size:18px;
   font-weight:bold;
}
hr, .hr {
   color:#b0b0b0;
}
</style>

<script language="JavaScript" type="text/javascript">
<!--

var objSnmpManager = new ActiveXObject("AxNetwork.SnmpManager");
var objConstants   = new ActiveXObject("AxNetwork.NwConstants");
  
function getInfo()
{
   document.getElementById("fldAxNetworkInfo").innerHTML = "Build: " + objSnmpManager.Build + "; Module: " + objSnmpManager.Module   
}
  
function DisplayType (lType)
{
   var strResult = ""

   switch ( lType )
   {
      case objConstants.nwSNMP_TYPE_INTEGER32:          strResult = "nwSNMP_TYPE_INTEGER32";        break;
      case objConstants.nwSNMP_TYPE_BITS:               strResult = "nwSNMP_TYPE_BITS";             break;
      case objConstants.nwSNMP_TYPE_OCTETSTRING:        strResult = "nwSNMP_TYPE_OCTETSTRING";      break;
      case objConstants.nwSNMP_TYPE_NULL:               strResult = "nwSNMP_TYPE_NULL";             break;
      case objConstants.nwSNMP_TYPE_OBJECTIDENTIFIER:   strResult = "nwSNMP_TYPE_OBJECTIDENTIFIER"; break;
      case objConstants.nwSNMP_TYPE_SEQUENCE:           strResult = "nwSNMP_TYPE_SEQUENCE";         break; 
      case objConstants.nwSNMP_TYPE_IPADDRESS:          strResult = "nwSNMP_TYPE_IPADDRESS";        break;
      case objConstants.nwSNMP_TYPE_COUNTER32:          strResult = "nwSNMP_TYPE_COUNTER32";        break;
      case objConstants.nwSNMP_TYPE_GAUGE32:            strResult = "nwSNMP_TYPE_GAUGE32";          break;
      case objConstants.nwSNMP_TYPE_TIMETICKS:          strResult = "nwSNMP_TYPE_TIMETICKS";        break;
      case objConstants.nwSNMP_TYPE_OPAQUE:             strResult = "nwSNMP_TYPE_OPAQUE";           break;
      case objConstants.nwSNMP_TYPE_COUNTER64:          strResult = "nwSNMP_TYPE_COUNTER64";        break;
      case objConstants.nwSNMP_TYPE_UNSIGNED32:         strResult = "nwSNMP_TYPE_UNSIGNED32";       break;
   }
	 
	 return strResult
}

function IetsAnders(strMethod)
{
   var objForm      = document.forms["AXForm"];
   var numLastError = 0;
   var strLastError = "";
   var numDataType  = objConstants.nwSNMP_TYPE_UNDEFINED;
   var strDataValue = "";

   var strOID       = objForm.CTL_OID.value;
	 
   objForm.CTL_GETNEXT.disabled = false;

   if( objForm.CTL_PROTOCOL.value == "SNMP v1" )
	 {
     objSnmpManager.ProtocolVersion = objConstants.nwSNMP_VERSION_V1;
   }
   else
   {
     objSnmpManager.ProtocolVersion = objConstants.nwSNMP_VERSION_V2C;
   }

   objSnmpManager.Initialize();
   numLastError                     = objSnmpManager.LastError;
      
   if( numLastError == 0 ){
     objSnmpManager.Open( objForm.CTL_AGENT.value, objForm.CTL_COMMUNITY.value, objForm.CTL_PORT.value );
     numLastError                   = objSnmpManager.LastError;
   }

   try{
      objSnmpObject                 = objSnmpManager.Get( strOID );
   }
   catch(e){
      alert("An exeption occured while executing the following OID:\n" + strOID);
   }
      
   numLastError                      = objSnmpManager.LastError;
   if( numLastError == 0 & strMethod == "getnext" )
   {
     try{
       objSnmpObject              = objSnmpManager.GetNext()
     }
     catch(e){
       alert("Unable to retreive next OID.");
     }

     numLastError                   = objSnmpManager.LastError;
   }

   if( numLastError == 0 ){
          numDataType                  = objSnmpObject.Type;
          strDataValue                 = objSnmpObject.Value;
          if( objForm.CTL_GETNEXT.value != "" )
          {
             strOID                     = objSnmpObject.OID;
          }
   }

   strLastError =  objSnmpManager.GetErrorDescription( numLastError )  

   objSnmpManager.Close();
   objSnmpManager.Shutdown();

   objForm.CTL_RESULT.value = numLastError + ": " + strLastError;
   objForm.CTL_OID.value    = strOID;
	 objForm.CTL_TYPE.value   = DisplayType(numDataType);
   objForm.CTL_VALUE.value  = strDataValue;
}
//-->
</script>

</head>

<body onload="getInfo()" class="ax_clbody">
<h1>ActiveXperts Network Component Sample - SNMP Get/GetNext</h1>
<hr size="1">


<form name="AXForm">
<table class ="clbody" width="700">

   <tr>
       <td valign="top" width="200">Component:</td>
       <td valign="top" width="500"><span id="fldAxNetworkInfo"></span></td>
   </tr>

   <tr>
       <td valign="top">Agent:</td>
       <td valign="top" width="500">
       <input style="width: 300px" type="text" name="CTL_AGENT" value="localhost">
       :<input style="width: 50px" type="text" name="CTL_PORT" value="161">
       </td>
   </tr>
   <tr>
       <td valign="top">Community:</td>
       <td valign="top"><input style="width: 300px" type="text" name="CTL_COMMUNITY" value="public"></td>
   </tr>
   <tr>
       <td valign="top">Protocol version:</td>
       <td valign="top">
          <select name="CTL_PROTOCOL" style="width: 300px">
             <option value="SNMP v1">SNMP v1</option>
             <option value="SNMP v2c" selected>SNMP v2c</option>
          </select>
        </td>
   </tr>
   <tr>
       <td valign="top">OID (Object ID):</td>
       <td valign="top"><input style="width: 500px" type="text" name="CTL_OID" value="system.sysName.0"></td>
   </tr>
   <tr>
       <td valign="top"> </td>
       <td valign="top">
       <input size="25" type="button" onclick="IetsAnders('get')" value="Get" name="CTL_GET" style="height: 23px; width: 245px"> 
       <input size="25" type="button" onclick="IetsAnders('getnext')" disabled="true" value="GetNext" name="CTL_GETNEXT" style="height: 23px; width: 245px;">
       </td>
   </tr>
   <tr>
       <td valign="top"> </td>
       <td valign="top"> </td>
   </tr>
       <tr>
       <td valign="top">Result code:</td>
       <td valign="top"><input type="text" name="CTL_RESULT" disabled="true" style="border:0px;width:500px;"></td>
   </tr>
    
   <tr>
       <td valign="top">Data Type:</td>
       <td valign="top"><input style="width: 500px" type="text" name="CTL_TYPE" value=""></td>
   </tr>
   <tr>
       <td valign="top">Data Value:</td>
       <td valign="top"><input style="width: 500px" type="text" name="CTL_VALUE" value=""></td>
   </tr>
  
</table>
<br>
<br>
</form>

<hr size="1">
<div class="ax_clfooter">
This sample is based on ActiveXperts Network Component, an <a target="_blank" href="http://www.activexperts.com">ActiveXperts Software</a> product.<br>
<a href="../Index.htm">Click here</a> to return to the HTML sample menu page.<br>

</div>

</body>
</html>

You can download the complete sample on our FTP site ftp.activexperts-labs.com/samples/network-component/. There are many other working Network Component scripts on our site and shipped with the product.