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Calling an image

j4v1

By j4v1
in PHP Coding Help

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j4v1 Newbie

j4v1

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Posted

A few quick questions that would truly help me complete a project i'm working on.

 

I have the following script that generates an image. The script works great, but heres where I'm stuck:

 

1. When calling the image it doesn't pull the latest (most recent), because the script is slow in creating the image.

2. What is the best way to call the image?

3. Can I execute this script in an html?

 

 

<?php
resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");
function resize($cur_dir, $cur_file, $newwidth, $output_dir)
{
    $dir_name = $cur_dir;
    $olddir = getcwd();
    $dir = opendir($dir_name);
    $filename = $cur_file;
    $format='image/gif';
    if(preg_match("/.jpg/i", "$filename"))
    {
        $format = 'image/jpeg';
    }
    if (preg_match("/.gif/i", "$filename"))
    {
        $format = 'image/gif';
    }
    if(preg_match("/.png/i", "$filename"))
    {
        $format = 'image/png';
    }
    if($format!='')
    {
        list($width, $height) = getimagesize($filename);
        $newheight=$height*$newwidth/$width;
        switch($format)
        {
            case 'image/jpeg':
            $source = imagecreatefromjpeg($filename);
            break;
            case 'image/gif';
            $source = imagecreatefromgif($filename);
            break;
            case 'image/png':
            $source = imagecreatefrompng($filename);
            break;
        }
        $dimg = imagecreatetruecolor(640,538);
        imagealphablending($dimg, false);
        $source = @imagecreatefromgif("$filename");
        imagecopyresized($dimg, $source, 0,0,0,438, $newwidth, $newheight, $width, $height);
        $filename="$output_dir/test1.gif";
        @imagegif($dimg,$filename);
    }
}
?>

 

Any assistance would truly be appreciated

 

THANK YOU!

J4v1

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j4v1 Newbie

j4v1

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Posted

Ok. I'm trying that right now.

 

So you're sayin' to make look like this, new snippet code at the bottom

<?php
[code=php:0]header('refresh:120; url=gold.php');

resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");

function resize($cur_dir, $cur_file, $newwidth, $output_dir)

{

    $dir_name = $cur_dir;

    $olddir = getcwd();

    $dir = opendir($dir_name);

    $filename = $cur_file;

    $format='image/gif';

    if(preg_match("/.jpg/i", "$filename"))

    {

        $format = 'image/jpeg';

    }

    if (preg_match("/.gif/i", "$filename"))

    {

        $format = 'image/gif';

    }

    if(preg_match("/.png/i", "$filename"))

    {

        $format = 'image/png';

    }

    if($format!='')

    {

        list($width, $height) = getimagesize($filename);

        $newheight=$height*$newwidth/$width;

        switch($format)

        {

            case 'image/jpeg':

            $source = imagecreatefromjpeg($filename);

            break;

            case 'image/gif';

            $source = imagecreatefromgif($filename);

            break;

            case 'image/png':

            $source = imagecreatefrompng($filename);

            break;

        }

        $dimg = imagecreatetruecolor(640,538);

        imagealphablending($dimg, false);

        $source = @imagecreatefromgif("$filename");

        imagecopyresized($dimg, $source, 0,0,0,438, $newwidth, $newheight, $width, $height);

        $filename="$output_dir/test1.gif";

        @imagegif($dimg,$filename);

    }

}

?>

<html>

<body> <img src="imagegif($dimg)"></body>

</html>

[/code]

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DarkWater Member

DarkWater

Posted
Posted

No.  Do this:

 

<?php
header('refresh:120; url=gold.php');
resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");
function resize($cur_dir, $cur_file, $newwidth, $output_dir)
{
    $dir_name = $cur_dir;
    $olddir = getcwd();
    $dir = opendir($dir_name);
    $filename = $cur_file;
    $format='image/gif';
    if(preg_match("/.jpg/i", "$filename"))
    {
        $format = 'image/jpeg';
    }
    if (preg_match("/.gif/i", "$filename"))
    {
        $format = 'image/gif';
    }
    if(preg_match("/.png/i", "$filename"))
    {
        $format = 'image/png';
    }
    if($format!='')
    {
        list($width, $height) = getimagesize($filename);
        $newheight=$height*$newwidth/$width;
        switch($format)
        {
            case 'image/jpeg':
            $source = imagecreatefromjpeg($filename);
            break;
            case 'image/gif';
            $source = imagecreatefromgif($filename);
            break;
            case 'image/png':
            $source = imagecreatefrompng($filename);
            break;
        }
        $dimg = imagecreatetruecolor(640,538);
        imagealphablending($dimg, false);
        $source = @imagecreatefromgif("$filename");
        imagecopyresized($dimg, $source, 0,0,0,438, $newwidth, $newheight, $width, $height);
        $filename="$output_dir/test1.gif";
        header('Content-type: image/gif');
        header('Pragma: no-cache');
        @imagegif($dimg);
    }
}
?>

 

Then, in ANOTHER file (an HTML file even), do:

<img src="getimage.php" />

 

As a completely separate file.  Name it getimage.php.

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j4v1 Newbie

j4v1

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  • Author
Posted

Thank you for helpin' me out.  I've been stuck on this problem for too long and its getting down to my deadline.

 

The script does what I want.  I generates the correct image that I need.  All that I'm looking to do is have the script execute, everytime I call the image to display on the browser.

 

Am I going about this totally, wrong.

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GingerRobot Regular Member

GingerRobot

Posted
Posted

Oh well duh.  You never call the function. 

 

Whats this line then?

 

resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");

 

 

 

As for the problem:

 

1.) Remove the error surpressors (@) -- how do you hope to find errors if you're surpressing them?

2.) You're creating from a gif (imagecreatefromgif) yet appear to want support for other image types.

3.) Your regex is going to be problematic. Taking your regex for png, for example:

 

"/.jpg/i"

 

This will match any string with the text jpg appearing after any character. That is, both of the following would match: image.jpg, ajpg.png. The . character is a special character, meaning any character. You should escape is and make the regex check only the end of the string:

 

if(preg_match("/\.jpg$/i", $filename))

 

And finally, you should get in the habit of posting your updated code. Its much easier for people to follow.

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j4v1 Newbie

j4v1

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  • Author
Posted

Thanks!!

I'll answer the first question:

 

Take the image from its current directory and sizing down and place it in the local current folder, when I call resize.

<?php
resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");

 

 

I've updated the script w/ your comments.

<?php
resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");
function resize($cur_dir, $cur_file, $newwidth, $output_dir)
{
    $dir_name = $cur_dir;
    $olddir = getcwd();
    $dir = opendir($dir_name);
    $filename = $cur_file;
    $format='image/gif';
    if (preg_match("http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif"/i, "$filename"))
    {
        $format = 'image/gif';
    }
    if($format!='')
    {
        list($width, $height) = getimagesize($filename);
        $newheight=$height*$newwidth/$width;
        switch($format)
        {
            case 'image/gif';
            $source = imagecreatefromgif($filename);
            break;
        }
        $dimg = imagecreatetruecolor(640,538);
        imagealphablending($dimg, false);
        $source = imagecreatefromgif("$filename");
        imagecopyresized($dimg, $source, 0,0,0,438, $newwidth, $newheight, $width, $height);
        $filename="$output_dir/test1.gif";
        imagegif($dimg,$filename);
    }
}
?>

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GingerRobot Regular Member

GingerRobot

Posted
Posted

No, i was actually just suggesting (as i posted) this:

 

if (preg_match("|\.gif$|i", $filename)){

 

I notice you would have had a parse error in the above. I wonder if you have the display of errors turned off. Add this:

 

error_reporting(E_ALL);
ini_set('display_errors','On');

 

To the top of your code.  I also notice you're not setting the correct header. You'll need to tell the browser what it's expecting. Thus the code is:

 

<?php
error_reporting(E_ALL);
ini_set('display_errors','On');
resize("./", "http://images.wsdot.wa.gov/nwflow/flowmaps/sysvert.gif", "538", "./");
function resize($cur_dir, $cur_file, $newwidth, $output_dir)
{
    $dir_name = $cur_dir;
    $olddir = getcwd();
    $dir = opendir($dir_name);
    $filename = $cur_file;
    if (preg_match("|\.gif$|i", $filename))
    {
        $format = 'image/gif';
    }
    if($format!='')
    {
        list($width, $height) = getimagesize($filename);
        $newheight=$height*$newwidth/$width;
        switch($format)
        {
            case 'image/gif';
            $source = imagecreatefromgif($filename);
            break;
        }
        $dimg = imagecreatetruecolor(640,538);
        imagealphablending($dimg, false);
        $source = imagecreatefromgif($filename);
        imagecopyresized($dimg, $source, 0,0,0,438, $newwidth, $newheight, $width, $height);
        header("Content-type: image/gif");
        imagegif($dimg);
    }
}
?>

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j4v1 Newbie

j4v1

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  • Author
Posted

Ok.  I'll give that a shot, but how should I go about executing the script and then calling the generated image, all from an html file?

 

Also, I just restarted and now everytime I try to preview I get the following error:

HTTP Error 500-  The required operations requires elevation
.  Not sure what Vista is doing, but its blocking me from see any of the code. 
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