Post To Web Library Question

aimlessen..

in Contributed Library Questions • 2 years ago

Hello Everyone,

I want to create a PGraphics off-screen then upload it to my server. I am using the Post To Web library. The .php file is on the server and successfully receives an image of the current sketch when I use the code on line 19 (verified via ftp), but does not upload my PGraphics type when I use the code on line 17. I really do not know what the 'g' in img.getBytes(g) is - any ideas?

In the console I receive the following message:

java.lang.IllegalArgumentException: im == null!

at javax.imageio.ImageIO.write(ImageIO.java:1457)

at javax.imageio.ImageIO.write(ImageIO.java:1565)

at org.seltar.Bytes2Web.ImageToWeb.getBytes(ImageToWeb.java:142)

at webApp.orderButton(webApp.java:790)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at controlP5.ControlBroadcaster.invokeMethod(Unknown Source)

at controlP5.ControlBroadcaster.callTarget(Unknown Source)

at controlP5.ControlBroadcaster.broadcast(Unknown Source)

at controlP5.Controller.broadcast(Unknown Source)

at controlP5.Button.setValue(Unknown Source)

at controlP5.Button.mouseReleased(Unknown Source)

at controlP5.Controller.setMousePressed(Unknown Source)

at controlP5.ControllerGroup.setMousePressed(Unknown Source)

at controlP5.ControlWindow.mouseEvent(Unknown Source)

at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at processing.core.PApplet$RegisteredMethods.handle(Unknown Source)

at processing.core.PApplet.handleMouseEvent(Unknown Source)

at processing.core.PApplet.dequeueMouseEvents(Unknown Source)

at processing.core.PApplet.handleDraw(Unknown Source)

at processing.core.PApplet.run(Unknown Source)

at java.lang.Thread.run(Thread.java:619)

<p><b>Error:</b> File is empty!</p>

Copy code

String url = "http://myDomain.com/Upload.php";
PGraphics pg = createGraphics(myX,myY,P2D);
pg.beginDraw();
pg.image(testImage,0,0,pg.width,pg.height);
pg.endDraw();
img.setType(ImageToWeb.PNG);
String subFolder = "subFolder";
String fileName = "fileName";
img.post(subFolder,url,fileName,false,img.getBytes(pg)); // this is the problem line
// img.post(subFolder,url,fileName,false,img.getBytes(g));

Any help is appreciated. Thanks everyone.

-aimless

Replies(4)

aimlessen..

Re: Post To Web Library Question

2 years ago

Alright, I looked at the documentation again and the getBytes() function should simply accept a PGraphics type. Perhaps this is a bug? I was going to use the getBytesJPEG() and getBytesTIFF(), but alas, they are protected. :(

byte[] getBytes(PGraphics src)
Get the given PGraphics bytearray

aimlessen..

Re: Post To Web Library Question

2 years ago

Alright, after many roundabout attempts, I tried changing the file type to .jpg in stead of .png and it worked flawlessly... I suspect that this is some sort of bug. To summarize:

Copy code

String url = "http://myDomain.com/Upload.php";
PGraphics pg = createGraphics(myX,myY,P2D);
pg.beginDraw();
pg.image(testImage,0,0,pg.width,pg.height);
pg.endDraw();
img.setType(ImageToWeb.JPG); // when this line is used there is no issue
// img.setType(ImageToWeb.PNG); // when this line is used the file is empty (error as described above)
String subFolder = "subFolder";
String fileName = "fileName";
img.post(subFolder,url,fileName,false,img.getBytes(pg));

It would be nice to be able to upload a .png (from a quality standpoint / support for an alpha channel) but I guess .jpg will work for now. I hope this helps someone.

-aimless

seltar

Re: Post To Web Library Question

2 years ago

Hey!

I'm sorry, but I can't see the problem right now, and I unfortunately don't have time to dig into it.. so I'm dumping my library work-folder here: http://libraries.seltar.org/postToWeb/ - section 1b.

Hopefully that can help you..

-seltar

aimlessen..

Re: Post To Web Library Question

2 years ago

Thanks for the response seltar,

I looked around and I think that the issue is on line 142 of ImageToWeb.java. I am by NO means a java expert and have no idea what could be wrong with that line, but I think that's where the exception was thrown. I poked around the java documentation and tried using a few different methods, but the effort was akin to a kid operating a power plant - just pushing buttons...

I found that the TIFF option still works just fine and I will just take the file size hit for now. Although I am highlighting a problem, I must say that I am very grateful for this library and all the time you have put into it. Many thanks!

-aimless

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