How to pass large amount of data to a script that generates a dynamic image?

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computer_guy - 20 Jul 2007 15:10 GMT

Hi Everyone,

I am writing an HTMP page like below:

---------------Dynamic HTML Page report.aspx-----------------------

1. Complicated algorithm to generate data and store it in memory

2. Inline Image to visualize generated data in graphic format.
<img id="ss_img" src="Charting.ashx?data=<Large Block of Data
Generated
(~ 32 KB - 512KB) > />

3. HTML table to visualize data generated in #1 in tabluar format.

----------------------End of HTML
Page-----------------------------------

My problem is that report.aspx has to pass a lot of data to
charting.ashx, so much that it cannot be passed into Chart.apsx with
HTTP GET. I don't think you can do HTTP POST on the <img> tag. I am
thinking to store the data to a temp file and pass the file name in
(<img src="Charting.ashx?tempfile=...">), but this is messy and it is
a problem to clear temp files.

Thanks a lot,
computer_guy

P.S. This is a refined version of a related message I posted yesterday
on this group. Yesterday's message was way too unclear. I apologize if
you have already read the previous message and was able to infer I
meant the same thing.

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Peter Bucher [MVP] - 20 Jul 2007 15:29 GMT

Hi computer_guy

> My problem is that report.aspx has to pass a lot of data to
> charting.ashx, so much that it cannot be passed into Chart.apsx with
> HTTP GET. I don't think you can do HTTP POST on the <img> tag. I am
> thinking to store the data to a temp file and pass the file name in
> (<img src="Charting.ashx?tempfile=...">), but this is messy and it is
> a problem to clear temp files.

where is the orgin of the data, that you`ll put on the querystring?
the usually way is to put a ID on the querystring, and grabbing the data
within
the Handler.

Signature

Gruss, Peter Bucher
Microsoft MVP - Visual Developer ASP / ASP.NET, Switzerland
http://www.aspnetzone.de/ - ASP.NET Zone, die ASP.NET Community
http://www.aspnetzone.de/blogs/peterbucher/ - Auf den Spuren von .NET

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computer_guy - 20 Jul 2007 16:37 GMT

> Hi computer_guy
>
[quoted text clipped - 13 lines]
> Gruss, Peter Bucher
> Microsoft MVP - Visual Developer ASP / ASP.NET, Switzerlandhttp://www.aspnetzone.de/- ASP.NET Zone, die ASP.NET Communityhttp://www.aspnetzone.de/blogs/peterbucher/- Auf den Spuren von .NET

Hi Peter,

The data that I want to put on the querystring is dynamically
generated by the host page. It is not stored anywhere. The host page
report.aspx does the following in sequence:

1. Generate data from some complicated algorithm
2. Pass this generated data to chart.aspx to display it as an inline
image.
3. Show this same data in HTML tables.

Thanks a lot,
computer_guy

Reply to this Message

Peter Bucher [MVP] - 20 Jul 2007 18:46 GMT

hi computer_guy

> 1. Generate data from some complicated algorithm
> 2. Pass this generated data to chart.aspx to display it as an inline
> image.
> 3. Show this same data in HTML tables.

Okay, thats not an easy situation :-)
My approach would be, to give the HttpHandler two possible parameters.
One of them for example called "htmldata" and the other "imagedata".

The Handler gives by de passed parameter the htmldata for the grid,
or the image data for the image back.

i dont know whether you only can generate the data in your aspx site, or
also in the Handler.
Otherwise, i would save this data temporary on the physical disk.

Signature

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computer_guy - 21 Jul 2007 00:10 GMT

> hi computer_guy
>
[quoted text clipped - 17 lines]
> Gruss, Peter Bucher
> Microsoft MVP - Visual Developer ASP / ASP.NET, Switzerlandhttp://www.aspnetzone.de/- ASP.NET Zone, die ASP.NET Communityhttp://www.aspnetzone.de/blogs/peterbucher/- Auf den Spuren von .NET

I ended up using a good old temporary file to pass the data. Thanks
for your help.

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How to pass large amount of data to a script that generates a dynamic image?

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