Categories: Mobile Web Server | Web Runtime (WRT) | Location Based Services | Code Examples

This page was last modified 14:06, 19 June 2008.

From Forum Nokia Wiki

Many Widset/Widget applications are limited by the fact that their APIs does not provide support for much of the functionality that is available to native applications. This could be functions like:

• Getting locations using the GPS module
• Taking photos with the camera
• Bluetooth connections
• Accessing Contacts, Inbox or External Applications
• Sending SMS
• and much more..

An easy fix is to use the Mobile Web Server to provide these functions. This can be achieved in a few steps:

Connecting to MWS from a Widset/Widget

The examples below shows how to get information from MWS

• Widget Example

function queryMWS()
{
   // This code uses Prototype, but a standard javascript request will work just as well
   new Ajax.Request("http://localhost/hello.py",
   {
      method: 'get',
      asynchronous: 'false',
      onSuccess: function(transport, json)
      {
         return true;
      },
      onFailure: function()
      {
         return false;
      }
    });
}

• Widset Example

void queryMWS()
{
   // Prepare the URL.
   String URL = "https://MWS_username:MWS_password@MWS_username.mymobilesite.net/hello.py";
		
   // Fetch from the URL.
   call(null, "httpLocalhost", "get", ["url" => URL], success, failure);
		
   void success(Object state, Value ret)
   {
      setBubble(null, "The server successfully returned " + ret);
      return;
   }
		
   void failure(Object state, String error)
   {
      setBubble(null, "Local server is not responding properly.");
      return;
   }
}

Using Python modules with MWS to provide local device functionality

Two files is necessary to get python executing on MWS:

• ht.acl

AddHandler mod_python .py
PythonHandler cam
PythonDebug On 
Options None
 
Order Deny,Allow
Allow from all
 
<FilesMatch "\.(pyc)$">
   Deny from all
</FilesMatch>

• hello.py

def handler(req):
   from mod_python import apache
   import httplib
 
   try:
      #
      # Execute any python code here
      #
      req.write("Hello World")
      req.status = 200
      return apache.OK
 
      except Exception, e:
         req.status = 404
	 return apache.OK

Good examples of how to use python modules can be found at the Mobile Python Book

• Example of using python to get the current location

def handler(req):
 
   from mod_python import apache
   import location
   import positioning
 
   req.content_type = 'text/xml'
 
   req.write("<?xml version='1.0' encoding='utf-8'?>")
   req.write("<twitnflick>")
   req.write("<modules count='" + str(len(positioning.modules())) + "' default='" 
    + str(positioning.default_module()) + "'>")
   for n in range(0, len(positioning.modules())):
      req.write("<module id='" + str(positioning.modules()[n]['id']) + "'>")
      req.write("<name>" + positioning.modules()[n]['name'] + "</name>")
      req.write("<available>" + str(positioning.modules()[n]['available'])      
       + "</available>")
      req.write("</module>")
	
   req.write("</modules>")	
 
   positioning.set_requestors([{"type":"service","format":"application","data":"test"}])
	gpspos = positioning.position()
   req.write("<position>")
   req.write("<latitude>" + str(gpspos['position']['latitude']) + "</latitude>")
   req.write("<longitude>" + str(gpspos['position']['longitude']) + "</longitude>")
   req.write("<altitude>" + str(gpspos['position']['altitude']) + "</altitude>")
   req.write("<horizontal_accuracy>" + str(gpspos['position']['horizontal_accuracy'])
    + "</horizontal_accuracy>")
   req.write("<vertical_accuracy>" + str(gpspos['position']['vertical_accuracy']) 
    + "</vertical_accuracy>")
   req.write("</position>")
 
   req.write("</twitnflick>")
 
   return apache.OK