Processing 1.0 - Processing Discourse - loadImage an extension-less image

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Index › Programming Questions & Help › Syntax Questions › loadImage an extension-less image

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loadImage an extension-less image (Read 1453 times)

Frederic

loadImage an extension-less image
Dec 3^rd, 2006, 2:36pm

Hi everyone!

I try to download an image which is :
http://re3.mm-a5.yimg.com/image/1987833668

with:
PImage img = loadImage("http://re3.mm-a5.yimg.com/image/1987833668");
image(img, 0, 0);

i catch this exception:
java.lang.NullPointerException
at processing.core.PGraphics.image(PGraphics.java:1999)
at processing.core.PApplet.image(PApplet.java:7149)
at Temporary_2080_5201.draw(Temporary_2080_5201.java:77)
at processing.core.PApplet.handleDisplay(PApplet.java:1318)
at processing.core.PGraphics.requestDisplay(PGraphics.java:564)
at processing.core.PApplet.run(PApplet.java:1413)
at java.lang.Thread.run(Unknown Source)

I hope for you that this link will be still alive when you will read my problem ;).

This code was working for pictures with filetype like "*
.jpg" just before i've tried to load a picture without extension.

I'm not sure but it seems that loadImage watch by himself the filetype of the picture. So is it possible to tell processing what filetype it is?

I hope someone can help me or tell me a solution!
Thank you in advance!!

Fred

fry

Re: loadImage an extension-less image
Reply #1 - Dec 3^rd, 2006, 8:42pm

unfortunately it needs the extension.. some ways to work around it:

1) you can actually add .jpg to the url in this case, because yahoo just ignores it:
http://re3.mm-a5.yimg.com/image/1987833668.jpg

2) if that weren't the case, you could probably cheat by using:
http://re3.mm-a5.yimg.com/image/1987833668?.jpg
because the ? wouldn't be interpreted by the server as part of the url. that wouldn't work if there's already a ? in the name, but it would cover some cases.

3) you could use loadBytes(), followed by java's Toolkit.getImage(), and do "new PImage()" on that:
Code:


byte[] b = loadBytes("someurl");
Image javaImage = Toolkit.createImage(b);
PImage image = new PImage(javaImage);

(not tested, but something like that should work)

fry

Re: loadImage an extension-less image
Reply #2 - Jan 30^th, 2007, 1:02am

for rev 0124, loadImage() has been altered such that:

+ if no extension is specified, it will attempt to load the image as png/jpg/gif.

+ a second version of loadImage() has been added with a parameter that lets you specify the proper extension for the image, i.e. loadImage("somelongurl", "jpg")

http://dev.processing.org/bugs/show_bug.cgi?id=500

hungerburg

Re: loadImage an extension-less image
Reply #3 - Apr 19^th, 2007, 11:15am

Hello!, I came here, with the same problem as the OP. Adding the second parameter works

thank you!

Still, with no indication of type in the url, loadimage outputs this: "Could not find a method to load http://... " Can't processing take the server supplied mime-type from the http-header, in this case "Content-Type: image/jpeg" to find out, if it can handle the file?

Just my two cents, in my setup I can make it so, only jpegs are ever sent, yet in a perfect world...

Peter

fry YaBB Moderator Offline Posts: 2623 mass, usa	Re: loadImage an extension-less image Reply #4 - Apr 20^th, 2007, 2:34pm the perfect world doesn't really exist and we can't rely on the mime configuration on the server to be correct. the "could not find a method" is an error if it's actually working, please file as a bug.

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