[Resolved] ImageCreateFromJPEG() Problems

[brianslade]

Hi all,
I am Running PHP4.3.1, MySql on Apache2 using XP pro.

I have been having great success with PHP ..untill I began the chapter in my book on generating images and manipulation. As soon as i started with the functions ImageCreateFrom???? () things have gone wrong. None of my PHP scripts seem to run . I dont get error messages just a blank page or a broken link in my html page. Looking back over my php.ini ect i seem to be correct but any suggestions are welcome. Here is the suspect code:

resize_image.php
<?php

$image = $HTTP_GET_VARS['image'];

if (!$max_width)
$max_width = 80;
if (!$max_height)
$max_height = 60;

$size = GetImageSize($image);
$width = $size[0];
$height = $size[1];

$x_ratio = $max_width / $width;
$y_ratio = $max_height / $height;

if ( ($width <= $max_width) && ($height <= $max_height) ) {
$tn_width = $width;
$tn_height = $height;
}
else if (($x_ratio $height) < $max_height) {
$tn_height = ceil($x_ratio $height);
$tn_width = $max_width;
}
else {
$tn_width = ceil($y_ratio * $width);
$tn_height = $max_height;
}

$src = ImageCreateFromJpeg($image);
$dst = ImageCreate($tn_width,$tn_height);
ImageCopyResized($dst, $src, 0, 0, 0, 0,
$tn_width,$tn_height,$width,$height);
header('Content-type:image/jpeg');
ImageJpeg($dst, null, -1);
ImageDestroy($src);
ImageDestroy($dst);

?>

and here is the php that calls the above:

<?php

include('include_fns.php');
include('header.php');

$conn = db_connect();

$pages_sql = 'select * from pages order by code';
$pages_result = mysql_query($pages_sql, $conn);

while ($pages = mysql_fetch_array($pages_result)) {

$story_sql = "select * from stories
where page = '".$pages['code']."'
and published is not null
order by published desc";
$story_result = mysql_query($story_sql, $conn);
if (mysql_num_rows($story_result)) {
$story = mysql_fetch_array($story_result);
print '<table border="0" width="400">';
print '<tr>';
print '<td rowspan="2" width="100">';
if ($story[picture])
print "<img src=\"resize_image.php?image=$story[picture]\"/>";
print '</td>';
print '<td>';
print '<h3>'.$pages['description'].'</h3>';
print $story['headline'];
print '</td>';
print '</tr>';
print '<tr><td align="right">';
print '<a href="page.php?page='.$pages['code'].'">';
print '<font size="1">Read more '.$pages['code'].' ...</font>';
print '</a>';
print '</table>';
}
}

include('footer.php');
?>

Thanks again to all those who have helped or nudged me in the right direction. Barry.

[axnoran]

Here's one that I'm using.

PHP 4.3.0
if you want to try to debug your code... manually code a url to point your script to a file (in my case something like http://my.server.here/index.php?sf=image1.jpg) and echo at key points (such as to the var you are using to store the image file name--make sure that your script is getting good information to work with). The browser might complain about headers already being sent... but the HTML source might give you good feedback.
Course, I'm not pulling the file from a database when I do this..., but it might help to break down the process into a sequence of known steps so you can see where it breaks...

<?php
session_start();
$sourcefile= $GET['sf'];
$picsize=getimagesize("$sourcefile");
$source_x = $picsize[0];
$source_y = $picsize[1];
$x_ratio = ($source_x/50);
if($x_ratio > 1)
{
$x = round($source_x/$x_ratio);
$y = round($source_y/$x_ratio);
}
else
{
$x = $picsize[0];
$y = $picsize[1];
}
$source_id = imageCreateFromJPEG("$sourcefile");
/ Create a new image object (not neccessarily true colour) /
$target_id=ImageCreate($x, $y);
/ Resize the original picture and copy it into the just created image
object./
//$target_id = $target_id . session_id();
//echo test;
$target=imagecopyresized($target_id,$source_id, 0, 0 , 0 , 0, $x, $y, $source_x, $source_y);
/ Create a jpeg with the quality of "$jpegqual" out of the image object "$target_pic"./
Header("Content-type: image/jpeg");
imagejpeg ($target_id, "", "35");
imagedestroy();
?>