wtf? no GD?

benkillin

OK, I have the latest stable version of PHP and from php.net it says:

Note: Since PHP 4.3 there is a bundled version of the GD lib. This bundled version has some additional features like alpha blending, and should be used in preference to the external library since it's codebase is better maintained and more stable.

yet, I cant seem to get the example on here:

http://us2.php.net/manual/en/ref.image.php

to work... mozilla spits this error out:

The image “http://localhost/chatterbox.php?image&text=text” cannot be displayed, because it contains errors.

and when I view the source of the page I get this:

Fatal error: Call to undefined function: imagecreatefrompng() in bahhhshhshshhsh\chatterbox.php on line 15

this is my code:

	header("Content-type: image/png");
	$string = $_GET['text'];
	$im = imagecreatefrompng("images/serious hazard.png");
	$orange = imagecolorallocate($im, 220, 210, 60);
	$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
	imagestring($im, 3, $px, 9, $string, $orange);
	imagepng($im);
	imagedestroy($im);

and it doesnt show anything if I use the img tag in html either.

any help on why this is happening?

I have php version 4.3.2 on windows XP pro.

feldon23

It still has to be compiled with --with-gd

It is not installed by default.

benkillin

well, how do I do that? I only used the precompiled cgi module.

panhead490

Taken from the php.net site under image_create_from_jpeg():

For Windows users who wants to enable the GD libary:

It took me some while to figure this out, but in the end it worked (and still does) great.

First download the latest (stable recommended) version of php

Unzip to f.ex c:\php\

Now you should have a file in c:\php\ that's named php.ini.dist (or something like that). Rename that to php.ini and copy it to the root of you Windows directory.

Open the php.ini file (the easiers way is to open the run promnt at your start menu and just type php.ini and hit enter).

Search (ctrl+f) for extension_dir. The default value is set to "./", make it to "./extensions"

Now you need to find where in the php.ini the modules for Windows is located. Search for gd.

Remove the ; char infront of this line: extension=php_gd2.dll

Try make a php script with some image functions and see if it works. F.ex $im = imageCreate("test.jpg");
If you get a message that says something like imageCreate function doesn't exist the gd libary is not loaded.

That's all. Have fun using GD in Windows 🙂

benkillin

thanks! I just needed the gd2.dll and to uncomment the line in the allready installed php.ini.

the gd site only gave me the source code of the module, and everytime I try to compile something from source on windows, it always fudges up.

benkillin

ok... I dont get any errors, but I also dont get any images......

this is my code:

if(isset($GET['text'])){
if(isset($GET['image'])){
header("Content-type: image/png");
$string = $_GET['text'];
$im = imagecreatefrompng("images/button1.png");
$orange = imagecolorallocate($im, 220, 210, 60);
$px = (imagesx($im) - 7.5 * strlen($string)) / 2;
imagestring($im, 3, $px, 9, $string, $orange);
imagepng($im);
imagedestroy($im);
}
echo '<img src="chatterbox.php?image&text=omg omg Oma">';
}

and it doesnt show anything...

panhead490

Have you tried something really simple to make sure everything is working? And I think you're problem is you aren't doing anything with the image (i.e. putting it to a broswer) and then destroying it. (Look at the last part of this script) Hopefully it helps...oh this script is from php/mysql web dev ed. 2...an incredible book/manual to have around. I hope I'm not breaking any copyrights...oh well...

i.e.

<?php
// set up image 
  $height = 200;
  $width = 200;
  $im = ImageCreate($width, $height);
  $white = ImageColorAllocate ($im, 255, 255, 255);
  $black = ImageColorAllocate ($im, 0, 0, 0);

// draw on image  

  ImageFill($im, 0, 0, $black);
  ImageLine($im, 0, 0, $width, $height, $white);
  ImageString($im, 4, 50, 150, 'Sales', $white);

// output image
  Header ('Content-type: image/png');
  ImagePng ($im);

// clean up 
  ImageDestroy($im);
?>

~panhead490

benkillin

yay, that works!

thank you.