HTML Form Telnet Sample Source Code

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

ActiveSocket features the following: ICMP, HTTP and HTTPs with support for proxy servers and secure web sites, Telnet, NTP time protocol, RSH remote shell script interface, SNMP (Simple Network Management Protcol), SNMP Traps, Sockets (TCP and UDP), WOL (Wake-On-LAN), and more.

ActiveSocket can be well integrated into HTML/Javascript environments.
This document describes how the ActiveSocket Toolkit can be integrated into HTML projects.

Step 1: Installation of ActiveSocket

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

Automatically using HTML code;
Using the ActiveSocket Toolkit InstallShield installation.

Automatic installation using HTML code

You can install the ActiveSocket Toolkit automatically using the following HTML code on top of the HTML page:

   <head>
      <object id="objSocket" codeBase="http://www.activexperts.com/files/activsocket/asocket.dll" height="30" width="200" 
              classid="CLSID:916C28A2-8314-4AA5-9E25-18E5DEFBE2A3" viewastext></object>
   </head>

The ActiveSocket Toolkit 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 ActiveSocket Toolkit installation procedure

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

Step 2: Create the ActiveSocket object in HTML

You must use Javascript to declare and create the objects.

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

   var objSocket;
 
   objSocket  = new ActiveXObject ( "ActiveXperts.Tcp" );

Step 3: Creating a simple telnet client

You can now setup a TCP/IP session.

The following HTML code shows how to create a simple telnet client:

<html>
   <head>
   <META HTTP-EQUIV="CONTENT-Type" CONTENT="text/html;CHARSET=utf-8" >
   <title>ActiveSocket HTML Sample</title>
   <script type="text/javascript">

   var objSocket;
   var nRetr;
   
   function Receive ()
   {
      while ( objSocket.HasData () == -1 )
      {
         textReceive.value = textReceive.value + objSocket.ReceiveString ();
      }

      setTimeout("Receive()",1000)
   }

   function Init ()
   {
      objSocket = new ActiveXObject ( "ActiveXperts.Tcp" );
      
      Receive (); 
   }
   
   function Connect ()
   {
      objSocket.Protocol = objSocket.asPROTOCOL_TELNET;

      objSocket.Connect ( textServer.value, 23 );
         
      textResult.value = "CONNECT: ERROR " + objSocket.LastError + " (" +objSocket.GetErrorDescription ( objSocket.LastError ) +")"; 
   }

   function Disconnect ()
   {
      objSocket.Disconnect ();
      
      textResult.value = "DISCONNECT: ERROR " + objSocket.LastError + " (" + objSocket.GetErrorDescription ( objSocket.LastError ) + ")";
   }
        
   function Send ()
   {
      objSocket.SendString ( textCommand.value , true );
	          
      textResult.value = "SEND: ERROR " + objSocket.LastError + " (" + objSocket.GetErrorDescription ( objSocket.LastError ) + ")";
   }

   </script>
   </head>
   
   <body onLoad="Init()" >
   <font face="sans-serif" size="2">
   <hr size="1" color="#707070">
   <font size="4">ActiveXperts ActiveSocket HTML Sample</font>
   <br>
   <br>
   <b>Telnet Client Demo.</b>
   <br>
   <hr size="1" color="#707070">
   <br>
   <table border="0" bgcolor="#f0f0f0" ID="Table1">
   <tr>
   </tr>	
   <tr>
      <td valign="top">Telnet Server:</td>
      <td>
         <input size="70" type="text" name="textServer" value="library.uah.edu"><br>
      </td>
      <td>
         <input type="button" onclick="Connect()" value="Connect">
         <input type="button" onclick="Disconnect()" value="Disconnect">
      </td>
   </tr>
   <tr>
      <td valign="top">Command:</td>
      <td>
         <input size="70" type="text" name="textCommand" value="guest"><br>
      </td>
      <td>
         <input type="button" onclick="Send()" value="Send">
      </td>
   </tr>   
   <tr>
      <td valign="top">Received:<br></td>
      <td>
         <textarea rows="6" name="textReceive" cols="54"></textarea>
      </td>
   </tr>
   <tr>
      <td valign="top">Result:</td>
      <td>
         <input size="70" type="text" name="textResult" value=""><br>
      </td>
   </tr>
   </table>
   </body>

There are many working samples included with the product. You can also find them on the ActiveXperts FTP site: ftp.activexperts-labs.com/samples/asocket.

The ActiveSocket tool is a Network Communications ActiveX software component (SDK). This control supports SNMP, SMTP, POP3, Telnet, TCP, NTP, RSH, HTTP, HTTPs, FTP, DNS, ICMP and more, and can be used by any Windows development platform, including Visual Basic .NET, Visual CSharp .NET, ASP .NET (VB,CS), ASP, Visual Basic, Visual Studio/Visual C++, Delphi, PHP, ColdFusion, HTML, VBScript and any other ActiveX/COM compliant platform. The ActiveSocket Toolkit is an ActiveXperts Software B.V. Product.