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MathGroup Archive 2005

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Re: Mathematica Graphics output in an ASP.NET WebApplication

  • To: mathgroup at smc.vnet.net
  • Subject: [mg53542] Re: Mathematica Graphics output in an ASP.NET WebApplication
  • From: "Hans Michel" <hmichel at sdc.cox.net>
  • Date: Sun, 16 Jan 2005 22:23:59 -0500 (EST)
  • References: <cs5beb$3tt$1@smc.vnet.net> <cs8l5d$emt$1@smc.vnet.net>
  • Reply-to: "Hans Michel" <hmichel at sdc.cox.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Javier:

Please see this previous thread from the newsgroup.

 [mg48059] Re: [mg48016] how to save a mathematica-made imagebox.image as 
jpg, gif, bmp in c#/.netlink?

Todd Gayley give a good explanation why this error happens.

I have been using the work around for some time. Point the Image to a new 
Image (Bitmap) object.

Hans




"Javier Chicote" <goraperas at hotmail.com> wrote in message 
news:cs8l5d$emt$1 at smc.vnet.net...
> Hello Hans,
>
> Thank you very much for your response, now I can see the image in my
> application, although I still have a problem:
>
> I would like the use the "mathKernel.Compute" and "mathKernel.Graphics"
> methods in my application, but I must use the
> "mathKernel.Link.EvaluateToImage" method to see the image. Do you know why
> does [#1] work and [#2] doesn't in the following code?? As far as I know,
> both EvaluateToImage and mathKernel.Graphic[0] methods return an
> System.Drawing.Image object.
>
> private void Page_Load(object sender, System.EventArgs e)
> {
>      mathKernel = new Wolfram.NETLink.MathKernel();
>      string path = "C:/Archivos de programa/Wolfram
> Research/Mathematica/5.0/mathkernel.exe";
>      mathKernel.LinkArguments = "-linkmode launch -linkname \"" + path +
> "\"";
>      mathKernel.Connect();
>      mathKernel.GraphicsHeight=200;
>      mathKernel.GraphicsWidth=200;
>      string input = "Plot3D[Sin[x y], {x, -Pi, Pi}, {y, 0 ,10}]";
>
>      // #1 This works OK :)
>      System.Drawing.Image img =
> mathKernel.Link.EvaluateToImage(input,200,200);
>
>      // #2 This does NOT work :(
> //    mathKernel.Compute(input);
> //    System.Drawing.Image img = mathKernel.Graphics[0];
>
>      img.Save(Response.OutputStream, ImageFormat.Jpeg);
>      mathKernel.Dispose();
> }
>
> Regards,
>
> Javier
>
>
> <hmichel at cox.net> escribió en el mensaje news:cs5beb$3tt$1 at smc.vnet.net...
>> Javier Chicote
>>
>> You are streaming a jpeg image to the image element with src attribute 
>> url
> Webform2.aspx in WebForm1.aspx page.
>>
>> The image you stream must be for lack of a better term well formed. Now 
>> if
> you were to take a jpeg image and add html text tag or any extraneous
> characters to that file most programs may not know how to render it. This 
> is
> what is happening on WebForm2.aspx. You have extraneous characters.
>>
>> Remove the DOCTYPE Declaration. No HTML or anything except for the page
> directive. Response stream must be neat.
>>
>> Just
>> "<%@ Page lan .... %>"
>>
>> WebForm2
>> ============================================================
>>
>> <%@ Page language="c#" Codebehind="WebForm2.aspx.cs"
> AutoEventWireup="false"
>> Inherits="mathGraph.WebForm2" EnableSessionState="False"
>> enableViewState="False" contentType="image/jpeg"%>
>> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
>>
>> Remove the preceding document type declaration
>> Hans
>>
>
> 


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