mapserver with ASP.NET

Mon Feb 6 07:29:45 PST 2006

web_template.xml:

<?xml version="1.0" encoding="utf-8" ?>
<map>
 <img value="[img]"/>
 <mapwidth value="[mapwidth]"/>
 <mapheight value="[mapheight]"/>
 <scalebar value="[scalebar]"/>
 <referenceMap value="[ref]"/>
 <imgxy value="[center]"/>
 <imgext value="[mapext]"/>
 <legend>
  <![CDATA[
  [legend]
  ]]>
 </legend>
</map>

code behind of the main aspx page:
...
...
protected string baseUrl = "";
protected string queryString = "";
protected string mapwidth = "";
protected string mapheight = "";
protected string scalebar = "";
protected string img ;
...
...
...
private void Page_Load(object sender, System.EventArgs e)
  {

   //LAYERS
   for (int i=0; i< layer.Items.Count; i++) {
    if (layer.Items[i].Selected) {
     layers += "&layer=" + layer.Items
[i].Value;
    }
   }
   queryString += layers;

   if(!IsPostBack) {

    //FIRST VIEW
               baseUrl = Request.QueryString["baseUrl"];
...
...
...
//Make the REQUEST to the cgi
    if(mode == "browse") {
     generateImgXml(queryString);
    } else {
     //QUERY MODE
     ...
...
...
...
private void generateImgXml (string parameters) {
   // Create a 'WebRequest' with the specified url.
   queryString = baseUrl + parameters;
   if(debug) Response.Write("<br>" + queryString);
   HttpWebRequest webRequest = (HttpWebRequest)
WebRequest.Create(queryString);
   //webRequest.KeepAlive = false;
   webRequest.Timeout=10000;
   webRequest.Method = "GET";
   // Send the WebRequest and read response
   HttpWebResponse webResponse = (HttpWebResponse)
webRequest.GetResponse();
   Stream sResponse = webResponse.GetResponseStream();
   StreamReader reader = new StreamReader(sResponse);
   //first line is additional info from MapServer
   string header = reader.ReadLine();
   if(header == "<HTML>") { //errore
    string message = reader.ReadToEnd();
    message += "\n\n\"" + header + message
+ "\"\n\n";
    Response.Write(message);
    return;
   }
   //actual parameters
   XmlDocument xmldoc = new XmlDocument();
   string doc = reader.ReadToEnd();
   xmldoc.LoadXml(doc);
   xmldoc.PreserveWhitespace = true;
   XmlNode root = xmldoc.DocumentElement;
   img = root.SelectSingleNode("img").Attributes
["value"].Value;
   mapwidth = root.SelectSingleNode
("mapwidth").Attributes["value"].Value;
   mapheight = root.SelectSingleNode
("mapheight").Attributes["value"].Value;
   scalebar = root.SelectSingleNode
("scalebar").Attributes["value"].Value;
   imgxy = root.SelectSingleNode("imgxy").Attributes
["value"].Value;
   imgext = root.SelectSingleNode("imgext").Attributes
["value"].Value;
   referenceMap = root.SelectSingleNode
("referenceMap").Attributes["value"].Value;
   legend = root.SelectSingleNode("legend").InnerText;
   sResponse.Close();
   reader.Close();
   webResponse.Close();
  }

Main aspx page (with applet Rosa, but I tried also jbox, dbox, and nothing
at all):
...
...
<APPLET NAME="RosaApplet" ARCHIVE="rosa/rosa.jar" CODE="Rosa2000" WIDTH="<%
=mapwidth%>" HEIGHT="<%=mapheight%>" MAYSCRIPT>
 <PARAM NAME="TB_POSITION" VALUE="top">
 <PARAM NAME="TB_ALIGN" VALUE="left">
 <PARAM NAME="IMG_URL" VALUE="<%=img%>">
 <PARAM NAME="INP_FORM_NAME" VALUE="mapserv">
 <PARAM NAME="TB_BUTTONS"
VALUE="zoomin|zoomout|recentre|fullView|pquery|nquery|print">
 <PARAM NAME="INP_TYPE_NAME" VALUE="INPUT_TYPE">
 <PARAM NAME="INP_COORD_NAME" VALUE="INPUT_COORD">

 <%
  if(mode == "browse") {
   Response.Write("<PARAM NAME=\"TB_SELECTED_BUTTON\"
VALUE=\"zoomin\">");
  }
  if(mode == "query") {
   Response.Write("<PARAM NAME=\"TB_SELECTED_BUTTON\"
VALUE=\"pquery\">");
  }
  if(mode == "nquery") {
   Response.Write("<PARAM NAME=\"TB_SELECTED_BUTTON\"
VALUE=\"nquery\">");
  }
 %>
...
...

This is "old" form style. There is a page reload at every request. I
suggest you use Ajax ( http://ajaxpro.schwarz-interactive.de/) instead,
wich is also more easy. I'll replay you later, cause I don't have time now
(and I just began to do it in free time after work).

Piero