[Pywps-devel] PyWPS synchronous mode

Tue May 18 04:05:59 CEST 2010

Hi all,

I have written the script below to execute and parse with OpenLayers a buffer query which has no user inputs (exampleBufferNoInputsProcess). 

The script is not working fully as yet. The script executes successfully on the server which I can see from the server logs.  Also, when I execute the process from the browser address bar, I can see all of the GML data for the features.

However, I am running PyWPS on Windows 7. I'm not sure what the problem is with the script but I know that Jachym said that Windows can not operate PyWPS in asynchronous mode. I don't quite understand what this means and also how I need to change the code to accomodate this problem.

Does anybody have any ideas on this?

Regards,

Alan

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd>
<html xmlns=http://www.w3.org/1999/xhtml
     xmlns:xsi=http://www.w3.org/2001/XMLSchema-instance
     xsi:schemaLocation=http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd
     xml:lang="en" >
    <head>
        <title>WPS Client - Execute</title>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <script type="text/javascript" src="http://openlayers.org/api/OpenLayers.js"></script>
        <script type="text/javascript" src="WPS.js"></script>
        <style type="text/css">
            #map {
                width :550px;
                height :400px;
            }
        </style>
        <script type="text/javascript">

            var lon = -100;
            var lat = 44;
            var zoom = 6;
            var map, layer;

            function init() {

  map = new OpenLayers.Map('map');

  map.addLayer(layer);

  map.setCenter(new OpenLayers.LonLat(lon, lat), zoom);

  // Initialize WPS 
  var wps = new OpenLayers.WPS("http://localhost/cgi-bin/pywps-3.1.0/wps.py",{onSucceeded: onSucceeded});

  // Define output for process
  var bufferOut = new OpenLayers.WPS.ComplexPut({
       identifier: "bufferout",
       title: "Answer1",
       asReference: true
  });

  // define the process, with one output
  var process = new OpenLayers.WPS.Process({
       identifier: "exampleBufferNoInputsProcess",
       async: false,
       storeSupported: true,
       grassLocation: true,
       statusSupported: false,

       outputs: [bufferOut]
  });

  // add the process to wps
  wps.addProcess(process);

  // execute the process
  wps.execute(process.identifier);

 };

 // Load data and call parse response  
 function onSucceeded(process) { 
      OpenLayers.loadURL(process.outputs[0].value, "", null, parseBufferResponse);
 };

 // parse the resulting buffer
 function parseBufferResponse(req) {
       var g = new OpenLayers.Format.GML();
       var features = g.read(req.responseText);
       features[0].attributes = {};
       var mPolygon = new OpenLayers.Geometry.MultiPolygon(features[0].geometry);
       features[0].geometry = mPolygon;
       features[0].state = OpenLayers.State.INSERT;
       map.addFeatures(features[0]);
 };

}

        </script>
    </head>
    <body>

  <div>
  <div id="messageLabel"></div>
  <input type="button" value="Click Me!" onclick="init();" />
  </div>

        <h1>WPS Execute</h1>
  <div id="map" style="width: 600px; height: 300px"></div>        
  </div>
  <div>
        </div>
    </body>
</html>

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