Install GD on Windows

rezagholi · August 23rd, 2004, 08:36 PM

Hi
I'm Some kind of new in this website and i don't know i'm in right track or not
but i have question and i hope i can find answer in this fourms
my question is
i have apache 1.3 3.1 and php 4.3 and mysql
and all works realy good
now i try to use gd but i can't
here is what i did
i went to php.ini in my dir c:/windows/php.ini
and i omit the ; on ;extension php_gd2.dll:
that means i change this ;extension php_gd2.dll to this extention php_gd.dll
and the extention_dir c:\php\extensions

so i did all those and i wrote a simple code like
<html>
<body>
<?php
header ("Content-type: image/png")
$image = imagecreate(200, 200);
$black = imagecolorallocate($image, 0, 0, 0);
imagefill($image, 0, 0, $black);
imagepng($image);

imagedestroy($image);
?>
</body>
</html>
and also i test that code for jpeg and still i don't get any image all i get is some sentences that i cannot read them like
"@@@y^gls;tfjuw%$@y
in my hole page

i wondering if you guys can help me
thank

Snib · August 23rd, 2004, 09:04 PM

Cross-post: http://p2p.wrox.com/topic.asp?TOPIC_ID=18038

rezagholi: Please do not cross-post, your message will be read.

<s>I suggest posting in a forum that has to do with what you are dealing with, perhaps one of the PHP forums. This is in no way feedback.</s>

Snib

<><

rezagholi · August 23rd, 2004, 09:06 PM

Sorry

richard.york · August 25th, 2004, 03:40 AM

Well, the answer to your question is pretty simple, you cannot dump binary data directly into a web document. So you actually have to create two documents to dynamically generate an image with PHP and include that image in an HTML document.

The first document must be a normal HTML document.

Code:

<html>
    <head>
    </head>
    <body>
         <img src='image_emulator.php' alt='PHP image emulator.'/>
    </body>
</html>

Then in a *second* document, write up your PHP that generates the image.

Code:

<?php
    //image_emulator.php

    header ('content-type: image/png')

    $image = imagecreate(200, 200);

    $black = imagecolorallocate($image, 0, 0, 0);

    imagefill($image, 0, 0, $black);
    imagepng($image);

    imagedestroy($image);
?>

This script does what its name implies, it emulates an image, it's just like creating a real .png file. By sending out the content-type header, the browser knows to treat the subsequent binary data as a PNG image, even though it really comes from a PHP script.

When you create this script, no whitespace can appear before the opening <?php delimiter, and no other output can come from the script, otherwise that data will get botched and the browser won't know what to do with it and you'll find yourself with a broken image.

Ever open up an image with a plain text editor?? This is what you see:
"@@@y^gls;tfjuw%$@y

That's the raw data of the image itself.

In the future you can verify the installation of PHP extenstions by running a phpinfo() script.

Code:

<?php
    phpinfo();
?>

When you install GD, a new heading appears with information specific to that extension.

Regards,
Rich

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