Hi Vidar,
Thank you for replying.
It might help if I explain briefly what I'm trying to achieve.
I have a Windows 2000 server connected to a mining device via some sort of
serial port communication.
The server listens to the port and decypher the incoming data stream from
that serial port and store them in
the appropriate places in the Database (SQL Server 2000). Data frame
generally comes in at around 100ms intervals.
One of the tables in the database is used to represent the current values of
the device attributes
I.e.
tblTagValues
==========
TagID int
Value real
The asp.net application is responsible for reading those "current" tag
values and display them in one form or another
(semaphores/flags, gauges, etc..). I understand that because of the nature
of web brower and internet latency, I may
not be able to achieve real-time presentation of the data, but we can
accomodate sub 5 seconds delay (near real time).
Can you suggest what the best method to achieve this is?
Ted
"Vidar Petursson" <> wrote in
message news:...
> Hi
>
> Maybe I don't understand you but for images its not complex
> getting only the image not the whole page....
>
> function doIt(newSrc){
> var img = new Image();
> img.src = newSrc;
> img.onload = doDisplay;
> img.onerror = errHandler;
> }
>
> function doDisplay(){
> document.images["imgName"].src = this.src; // imgName is the target img
> }
>
> function errHandler(){
> // Handle error
> }
>
> Obliviously a very basic example...
>
> Preloading images...
> function preLoad(){
> var a = new Array();
> for( i = 0; i < preload.arguments.length; i++ )
> {
> a[ i ] = new Image();
> a[ i ].src = "PATH/" + iPreload.arguments[i];
> }
> }
>
> preLoad("img1.gif","img2.gif","img3.jpg");
>
>
> For text you could use webservices or a hidden iframe to load the data
>
http://msdn.microsoft.com/downloads/...ce/default.asp
> DHTML sdk
>
http://msdn.microsoft.com/library/de...ence_entry.asp
>
> --
> Best Regards
> Vidar Petursson
> ==============================
> Microsoft Scripting MVP
> http://www.microsoft.com/technet/scriptcenter
> ==============================
> "Ted Burhan" <> wrote in message
> news:...
> > Hi all,
> >
> > I'm trying to display a real-time data in one form or another (i.e.
> > animation/graphic file, or just a text) in asp.net.
> > The data for the images/text is retrieved from a SQL Server database.
> >
> > I have a few plans in mind:
> > - I could have an aspx page that would use GDI+ classes to generate the
> > graphics and let the page refreshes the images at a regular interval.
The
> > drawback is though, there may be a dozen of images in a single page,
which
> > means that there would be a dozen or so postbacks at every iteration,
> > hence,
> > demanding a lot of CPU time at the server as well as the client machine.
> > - I could have a single aspx page that would refresh at a regular
> > interval.
> > Obviously I will have to have a pre-made images for each possible
states.
> > - Another alternative is to use Flash as it could talk to SQL Server
> > directly using the Xml objects. Setting up flash movies in an aspx page
is
> > quite tedious job though. While browsing through the net I found several
> > libaries that could actually let me generate SWF file in .NET, but most
of
> > them are still in Alpha stages, so I'm not very comfortable of using
them.
> >
> > Can anyone please give me a suggestion on what the most efficient way of
> > doing this is? Maybe somebody has even done this before.
> >
> > Many thanks
> > Ted
> >
> >
>
>
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