Processing Forum

Some ProcessingJS notes for myself (IE9, unable to load... & images)

[0 Replies]
- 11-Jun-2012 02:56 PM
- Forum: Processing with Other Languages
I just had some bugs that keeps popping up in ProcessingJS, especially in IE9, that I thought I should share. Update: the main problem might lie within SVG & the @pjs preload.

1. ProcessingJs fails to load due to XHR status 404. Read this:

http://forum.processing.org/topic/unable-to-load-pjs-sketch-files-lifetime-web-pde-invalid-xhr-status-404-message-in-browser

2. Unable to load pjs sketch files: but with no explanation as to why.

Probably it will be the images. Either the path is wrong (somewhat confusing whether it loads from the data folder automagically or if you should spell the path. Spell the path! Don't use the @pjs directive. The images will show up eventually anyway. If using the @pjs directive the "Unable to load..."-message keeps showing up - in IE9. That means Only in IE9. Where else :-)

If I ever forget this, I hope I find this post for myself. It will save me tons of time...

/J

Processing.js sensitive to webserver type?

[1 Reply]
- 29-Dec-2011 05:04 PM
- Forum: Processing with Other Languages
I am stuck on a bug concerning binding Javascript with processing.js according to Pomax excellent guide on processingjs.org. I can't seem to figure out the problem since the sketch is working fine and binds JS fine on one kind of webserver (Unix), but not with that same file and identical HTML on an IIS (MS server). I can get JS to bind to a smaller simpler file on IIS, but running the bigger file (even commented out completely inside the smaller working one) the JS refuses to bind.

Is IIS more sensitive perhaps?
Any input to this or similar experiences would be much appreciated.

[2 Replies]

22-Nov-2011 02:21 PM
Forum: Processing with Other Languages

I might be totally alone with this problem since I haven't found any other pjs user stumbling on this recently.

The main problem is that the pjs-sketch will not load/start in IE9 until you press F12 (getting the developer tools pane up) and close it by pressing F12 again and then reload the sketch. Then it works excellent. This is really strange behaviour since not all sketches suffer from this in IE9. My pjs-sketch - loaded in the HTML-template that Processing2.0a1 produces (2.0a4 is not a good choice right now). All other browsers is fine with the sketch as expected.

I understood that this was an old problem for pjs that was supposed to be fixed around pjs 1.0.

Then I read something about how IE9 uses document formats <meta http-equiv =" X-UA-Compatible " content =" IE=9 " >. (This meta tag was also especially important to be placed first in order from <head>.) Related to that was that IE9 had this part (how it handles document formats) rewritten compared to older IE versions. Not sure how or why but it could affect the JS-part of that.

So I tried to find how (IE9-)working pages like http://www.trevorbedford.com/coaltracejs/, http://sandropaganotti.com/wp-content/goodies/demos/twitter-stream/ & http://www.clearcongressproject.com/ solved their html. They went on different approaches, I tried to mimic by placing the processing.js in the body instead of the head, !doctype etc.

I also found that that <!doctype html> was very important from processingjs devs discussion.

But nothing helped my particular sketch from getting rid of the F12-bug. HTML as below, modified from the Processing2.0a1 template:

	<!doctype html>
	<html>
	<head> <meta http-equiv="X-UA-Compatible" content="IE=9" >
	<meta http-equiv="content-type" content="text/html; charset=utf-8">


	<title> MyPjs </title>

	<style type="text/css">
	body {
	background-color: #333; color: #bbb; line-height: normal;
	font-family: Arial, sans-serif;
	font-size: 11px; font-weight: normal; text-decoration: none;
	line-height: 1.5em;
	}
	a, a:link, a:visited, a:active, a:hover {
	color: #cdcdcd; text-decoration: underline;
	}
	h1 {
	font-family: Arial, Helvetica Neue, Verdana, Geneva, sans-serif;
	width: 100%; letter-spacing: 0.1em;
	margin-bottom: 1em; font-size: 1.65em;
	}

	</style>

	<!--[if lt IE 9]>
	<script type="text/javascript">alert("Your browser does not support the canvas tag.");</script>
	<![endif]-->

	<script type="text/javascript">function getProcessingSketchID () { return 'MyPjs'; }</script>

	</head>
	<body>
	<div id="content">


	<script src="processing.js" type="text/javascript"></script>
	<canvas id="MyPjs" data-processing-sources="MyPjs.pde"
	width="1024" height="700">
	<p>Your browser does not support the canvas tag.</p>
	<!-- Note: you can put any alternative content here. -->
	</canvas>
	<noscript>
	<p>JavaScript is required to view the contents of this page.</p>
	</noscript>

	<script type="text/javascript">

	if (/MSIE (\d+\.\d+);/.test(navigator.userAgent)){ //test for MSIE x.x;
	var ieversion=new Number(RegExp.$1) // capture x.x portion and store as a number
	if (ieversion>=9)
	document.write("<br>If you are on IE9 and cannot see the sketch, please press F12 twice an then reload the page.")
	}
	</script>
	</body>
	</html> Any tips on explanations, further reading or guides would be great.

Anyone got experience from the Processing friendly tool Field?

[3 Replies]
- 06-Nov-2010 04:12 PM
- Forum: General Discussion
Just found Field on one of blprnts blogposts.

What is that?

Anyone tried it?

Looks funny. And... different.

/Johan

http://visualinformation.org

Problems making an application - Eclipse, Ant, classpaths and classNotFound

[2 Replies]
- 01-Sep-2010 03:33 PM
- Forum: Integration and Hardware
I use Eclipse for my main development but when I want an .app or .exe I usually paste my code into the Processing IDE and export the applications from there. I remove the java related stuff like the main function at the bottom and the package from the top and the class that extends PApplet.

This has worked fine until I found a new library that is a java library which is located in Library/Java/Extensions/ on my mac. When I try to make my application it hangs on Windows (Win7 btw) with the "ClassNotFound" (or similar) statement in the mini-dialog-window. (I think I solved that by faking the jars into being libraries, but still not too sure as to why they worked or if they have anything to do with classNotFound)

So I guess that there are several reasons as to why this might happen. One thing is missing Jars. Another is the package (mypackage.TheClass) thing and the java -classpath (no idea where I add that if needed in Eclipse for that matter). And then there is the actual making of the application. Perhaps I need to learn more on the compiling-part? The P5 Exporter isn't working unfortunately. I also was wondering about Ant. Do I need to learn Ant to figure out what the problem is? I guess everything is worthwhile to learn, but I am not sure of where to go on the reading.

And on top of that I copied a fully working Processing-class in Eclipse and just renamed it, changing the name at the top and the main class at the bottom. It usually works fine, but now I get this: Exception in thread "main" java.lang.NoClassDefFoundError:
So back to the compiling? Or where do I turn to learn relevant compiling-techniques?
It seems like at least two different sets of problems in the same post here but any comment would be helpful.

I use this statement for the Eclipse standalone class at the bottom:

static public void main(String args[]) {
PApplet.main(new String[] { packagename.NewClassCopiedFromWorkingOne.class.getName() });
}

Any hints or ideas where to read up would be helpful. Too much time spent on trying to work around this...
Do I mix in Java too much. But should that be a problem?
I want to solve this since I suspect it will show up alot.

All the best.
/JohanW

Serializing and exporting/saving objects

[4 Replies]
- 05-Aug-2010 03:15 PM
- Forum: Programming Questions
Hey

I found this old post from "drdoe" at the old forum (published four years ago) and was wondering the same thing - apart from the Boids part. Anyone know if you can serialize in a way that makes the RegisteredMethods become serialized or skipped or something that makes me serialize my own class? Is the question obsolete? Am I missing something obvious?

I was thinking about why it becomes a problem and the current guess is that as long as I have any methods from PApplet in my class, the class will not serialize at all. (?)

It is not a major issue for me even if it would be a wonderfully convenient (and data safe) way to save some data.

I've got a sketch with a some class instances I'd like to export (basically, it's an evolution-simulation with a population of boids). All the involved classes implement Serializable, and java.io.* is imported for the entire sketch.
However, I get the following error:

java.io.NotSerializableException: processing.core.PApplet$RegisteredMethods

(I got a different notSerializable-exception when I used OpenGL, but OpenGL isn't really necessary in this situation [neither is P3D]).
I've got the following code (all in seperate try-catch blocks):

f_out= new FileOutputStream("winner.data");
ObjectOutputStream obj_out = new ObjectOutputStream (f_out);
obj_out.writeObject ( boid[0] ); // the exception above is thrown here

the boid[0]-instance is the boid with the best fitness after x generations, and that class instances some other classes of my own making, but as I mentioned, they all implement Serializable.

Soooo what do I do?

Anyone got any insights in this?

All the best
/JohanW

http://visualinformation.org

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