Re: [Imageja-devel] Passing macro arguments to ImageJA

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Hi, David,

It doesn't look like this is currently possible, but it shouldn't be
hard to implement. You'll have to download the source code to make these
modifications.

If you pass a parameter to the applet with a param tag you can retrieve
the value by calling getParameter("key") on the ij.ImageJApplet class. I
would make a static instance variable in the ImageJApplet class, then in
the init() method set the instance variable to 'this', also add a public
method getInstance() to retrieve the ImageJApplet instance object. This
should allow you to retrieve the parameters.

Hope this helps.

Regards,
Sarel

-----Original Message-----
From: Pinelle, David [mailto:dav...@us...] 
Sent: Wednesday, February 03, 2010 3:07 PM
To: ima...@li...
Subject: [Imageja-devel] Passing macro arguments to ImageJA

I am using ImageJA as a viewer for a radiological teaching file system.
So far, so good, but I have a question about passing arguments (using
the HTML PARAM tag) to the applet. I am able to pass the URLs for images
to the applet without any problem, and people are able to interactively
select images in my system, and then the images are displayed in the
ImageJA viewer.

My goal now is to be able to pass several variables to the applet and
then to be able to write an ImageJ macro or plug-in that can manipulate
the variables. I noticed that the ImageJApplet class has been modified
in ImageJA, and it accepts macro expressions or macros posted in URLs.
It seems like this should solve my problem, but I have not been able to
get this feature to work properly. I have passed in my variables as
macro expressions, and I have also passed in a short macro as an
expression. I have tried several variations on this: I have passed in
the variables as separate eval parameters, and I have tried interacting
with the variables in macros launched through StartupMacros.txt, etc.,
but without much luck. Nothing seems to happen when I run my code, and
when I try to access the variables in other macros, they are not
recognized.

This code runs in a Java servlet that is deployed in Tomcat. Everything
works and has been tested extensively...except the arguments that are
being passed in using the eval1 parameter. The part that is included in
the eval1 PARAM is a simple test macro that is supposed to print the
variables to the screen so that I can make sure they reach the applet
okay. When I run this code, the ImageJA applet does not acknowledge the
eval1 PARAM.

My main question is whether this functionality is fully implemented at
this point (passing in macros) and whether I am doing this correctly. I
also would like to know how the variables passed in through the eval
parameter are scoped. If, for example, I pass in a variable like this:

applet.append("<PARAM NAME=eval1 VALUE=\"var
host=\""+req.getHeader("host")+"\";\" >");

How/where can I access it once it reaches the applet (using macros or
plugins)?

Thanks and regards,
David

String reqURL = req.getRequestURL().toString();
int k = reqURL.indexOf("://") + 3;	//get past the protocol
k = reqURL.indexOf("/",k) + 1;	//get to the beginning of the servlet
name
k = reqURL.indexOf("/",k) + 1;	//get to the end of the servlet name,
plus the slash
StringBuffer applet = new StringBuffer();
applet.append("<HTML><BODY>");
applet.append("<APPLET ");
String codebase = reqURL.substring(0,k) + "dicomviewer/imagej";
applet.append("CODEBASE=\""+codebase+"\" ");
applet.append("ARCHIVE=\"ij.jar\" "); 
applet.append("CODE=\"ij.ImageJApplet.class\" "); 
applet.append("NAME=\"Viewer.java\" ");
applet.append("WIDTH=\"100% \" ");
applet.append("HEIGHT=\"100%\" ");
applet.append("HSPACE=\"0\" ");
applet.append("VSPACE=\"0\" ");
applet.append("ALIGN=\"top\" ");
applet.append(">");
applet.append("<PARAM name=\"java_arguments\" value=\"-Xmx256m\">");
applet.append("<PARAM NAME=url1 VALUE=\""+reqURL+"\">");

//THIS IS WHERE I AM HAVING PROBLEMS
applet.append("<PARAM NAME=eval1 VALUE=\""+
	"var
host=\""+req.getHeader("host")+"\";"+System.getProperty("line.separator"
)+
	"var
authorization=\""+req.getHeader("authorization")+"\";"+System.getPropert
y("line.separator")+
	"var
useragent=\""+req.getHeader("user-agent")+"\";"+System.getProperty("line
.separator")+
	"var
accept=\""+req.getHeader("accept")+"\";"+System.getProperty("line.separa
tor")+
	"var
keepalive=\""+req.getHeader("keep-alive")+"\";"+System.getProperty("line
.separator")+
	"var
referer=\""+req.getHeader("referer")+"\";"+System.getProperty("line.sepa
rator")+
      "print (\"The arguments
are:\");"+System.getProperty("line.separator")+
      "print (\"host \" + host);"+System.getProperty("line.separator")+
      "print (\"authorization \" +
authorization);"+System.getProperty("line.separator")+
      "print (\"useragent \" +
useragent);"+System.getProperty("line.separator")+
      "print (\"accept \" +
accept);"+System.getProperty("line.separator")+
      "print (\"keepalive \" +
keepalive);"+System.getProperty("line.separator")+
      "print (\"referer \" +
referer);"+System.getProperty("line.separator")+
      "print (\"--\");                        \" >");
applet.append("</APPLET>");
applet.append("</BODY></HTML>");

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