imagePNG does nothing

[funaki]

hi there
I've posted this some days ago, but no answer - maybe unlucky time or so. I'll try it again one last time, hope to get some answers. don't punish me, I'm really desperate.
I have this problem with imagePNG, it just does nothing, no ouput!
I searched in the archive and found pretty much the same problem there:
http://www.phpbuilder.com/forum/read.php3?num=4&id=2094&loc=0&thread=2094
I also tried saving the picture to a file, but it's size is just 0kb..

Has anyone some ideas how I can solve this? I reinstalled gd, und libpng (and so also php and apache!) several times with different settings, it was "successful" every time (means: with png support) and it didn't really help :-(...

thx in advance!
ari

[majik-sheff]

can you post the code you're using?

[funaki]

sure I can:

$src_img = ImageCreateFromJPEG($path);
Header("Content-type: image/png");
ImagePng($src_img, "", 100);

ImageDestroy($src_img);

well, I don't think that I made mistakes on those 4 lines.. maybe the "Coding" forum is not the right place - but I thought IF somebody knows that problem, he'll certainly be here too...
thank you!

[funaki]

ups, there is
PNG, not JPEG..

[majik-sheff]

You only need 1 argument for ImagePNG:

ImagePng($src_img);

[funaki]

does not make a difference..
since I need to create dynamic buttons (so JPEG doesn't fit) and GIF is not supported anymore I'm pretty desperate..

[[deleted]]

Have you tried error checking?

When debugging image code, you should always try it wihout the image headers, because they hide the errors.
Also, you should turn error reporting up

error_reporting(E_ALL);
if (!$src_img = ImageCreateFromJPEG($path))
{
echo 'failed to open image';
}
else
{
if (!ImagePng($src_img, "", 100))
{
echo 'Could not create image';
}

[funaki]

ok what happens is.. still nothing (both programs, see below). this is really weird..

jpegtopng.php

error_reporting(E_ALL);
if (!$src_img = ImageCreateFromJpeg($path)){
echo 'failed to open image';
}
else
{
if (!ImagePng($src_img))
echo 'Could not create image';
}

pngtojpeg.php

error_reporting(E_ALL);
if (!$src_img = ImageCreateFromPNG($path)){
echo 'failed to open image';
}
else
{
if (!ImageJpeg($src_img))
echo 'Could not create image';
}

---

[majik-sheff]

have you removed the header?

[funaki]

yes!

[majik-sheff]

Try checking for equality using a == instead of a =

jpegtopng.php

error_reporting(E_ALL);
if (!$src_img = ImageCreateFromJpeg($path)){
echo 'failed to open image';
}
else
{
if (!ImagePng($src_img))
echo 'Could not create image';
}

pngtojpeg.php

error_reporting(E_ALL);
if (!$src_img == ImageCreateFromPNG($path)){
echo 'failed to open image';
}
else
{
if (!ImageJpeg($src_img))
echo 'Could not create image';
}

[funaki]

this is not supposed to be a check for equality, instead it is saving the image handler or how that is called...
I tried it with additional brackets too.. no change

[majik-sheff]

Eventually, I will learn to post the corrected code with my message... 🙂

== is test for equality
!= is test for inequality

But this won't help you here anyway... here's what you need.

error_reporting(E_ALL);

$im = ImageCreateFromJpeg($path);
if (!is_resource($im)){
echo 'failed to open image';
} else {
if (!ImagePng($src_img)) {
echo 'Could not create image';
}
}

[funaki]

really nice try.. ;-)..
still not. ;-(
besides.. I'm recompiling it right now (I already did a dozen times.. but this time .. g)

[majik-sheff]

Well hell, e-mail me the code and I'll check it on my system.