Network Programming in .NET

I wasn’t able to find any information on these errors which are routinely crashing my IIS server. And I was hoping somebody could throw some light on them

Fault bucket 197406881.

Reporting queued error: faulting application w3wp.exe, version 6.0.3790.1830, faulting module ntdll.dll, version 5.2.3790.1830, fault address 0x0001c93c.

ISAPI ‘C:WINDOWSMicrosoft.NETFrameworkv1.1.4322aspnet_isapi.dll’ reported itself as unhealthy for the following reason: ‘Deadlock detected’.

Error: File /Default.asp  Script Engine Exception. A ScriptEngine threw exception ‘C0000005’ in ‘IActiveScript::SetScriptState()’ from ‘CActiveScriptEngine::ReuseEngine()’..

Error: File /articles/header.asp  Unexpected error. A trappable error (C0000005) occurred in an external object. The script cannot continue running..

Error: File /programming-in.net/header.asp  Script Engine Exception. A ScriptEngine threw exception ‘C0000005’ in ‘IActiveScript::SetScriptState()’ from ‘CActiveScriptEngine::ReuseEngine()’..

Error:   Script Engine Exception. A ScriptEngine threw exception ‘C0000005’ in ‘IScriptDispatchEx::Release()’ from ‘CScriptingNamespace::UnInit()’..

Error: File /articles/wmi.asp  Unexpected error. A trappable error (C0000005) occurred in an external object. The script cannot continue running..

Ok, this is more web design than .NET development, but I thought I’d share this tip. If you’re like me, you hate working with the highly complex table structure that gets generated when you press "Save for the web" in photoshop. You end up with little fine white lines cropping up between cells and ruining the look of your site.

Generally, when you have a button placed upon a background, you have to cut the image up into table cells, and then use an onMouseOver / onMouseOut attributes on the image to provide the rollover effect. But if you have 20 buttons on an image, placed irregularly on a background image, you end up with having to cut out 50 or so different cells with image fragments. And then it all becomes messy.

What I propose to to use a background image, and trap mouse movements over that image. when it falls within a particular window ie 20,20 to 30,30 – It overlays another image on top, providing a rollover effect (* Actually more of a ‘Hover’ effect, but quite similar), without having to cut up the image.

To give a sample of the javascript:

<script language="JavaScript">

var intRollovers = 2; 
var intSx = new Array; // start x (left)
var intEx = new Array; // end x (right)
var intSy = new Array; // start y (top)
var intEy = new Array; // end y (bottom)
var strImage =new Array; // Rollover image
var strLink =new Array; // hyperlink
var imgCache = new Array;

intSx[1]=224;intEx[1]=296;intSy[1]=88;intEy[1]=106;strImage[1]="ZoneDesign/HomeOn.gif";   strLink[1]="default.aspx";

var IE = document.all?true:false;
if (!IE) document.captureEvents(Event.MOUSEMOVE)
if (!IE) document.captureEvents(Event.MOUSEDOWN)
document.onmousemove = getMouseXY;
document.onmousedown = getMouseXY;

function getMouseXY(e)
{
 if (IE)
 {
  tempX = event.clientX + document.body.scrollLeft;
  tempY = event.clientY + document.body.scrollTop;
 }
 else
 { 
  tempX = e.pageX;
  tempY = e.pageY;
 }   
 document.all["imgRollover"].style.display="none";
 for(i=1;i<intRollovers;i++)
 {
  if (tempX>intSx[i] &&
   tempX<intEx[i] &&
   tempY>intSy[i] &&
   tempY<intEy[i])
  {  
   document.all["imgRollover"].style.display="none";
   document.all["imgRollover"].style.left = intSx[i];
   document.all["imgRollover"].style.top = intSy[i];
   document.all["imgRollover"].src=strImage[i];
   document.all["imgRollover"].onload = unHideImage;   
   if ((IE && event.button == 1) || (!IE && e.which == 2))
   {
    window.location.href=strLink[i];
   }
   break;   
  }
 } 
 return true;
}

function unHideImage()
{
 document.all["imgRollover"].style.display="block";
}

</script>

Then include the following HTML after the body tag

<img id="imgRollover" style="position:absolute; display:none">

I found my IIS server crashing more often than usual, and although a net stop w3svc / net start w3svc was bringing it up to speed again. I couldn’t rely on this to keep the server going on a long-term basis

I looked in the Event log, and found a recurring error which read "It is not possible to run two different versions of ASP.NET in the same IIS process. Please use the IIS Administration Tool to reconfigure your server to run the application in a separate process.". As readers of this blog will know I have .NET 2.0 beta 2 installed on my server, along with .NET 1.1. So I read up on the Microsoft Technet site about IIS worker processes, and it seemed to recommend this course of action

* Create a new Application Pool specifically for .NET 2.0 apps.

* Right click on a .NET 2.0 website (in my case www.downloadsoft-ware.co.uk) click on Home directory. Then under the drop down box for application pools, select the .NET 2.0 app-pool.

And it hasn’t crashed since. But I’ll leave it for 24 hours.

Test your touch-typing abilities: http://www.dataentryservices.info/Register.aspx 90 seconds to type a shakesperian quote. I only managed to get 12% typed before the time elapsed. 🙂

Nice little trick to do this auto submitter:

setTimeout(‘window.document._ctl0.submit()’,90000);

If you try to make a web reference to a web service that resides on a non-standard port (i.e. not port 80), you get an error "Unable to download files from …. Do you want to skip these files and continue?"

You get an error if you try to update the reference

Custom tool warning: DiscoCodeGenerator unable to initialize code generator.  No code generated.

The reference.map file contains the following