image (GD) not created correctly when using variables

nunomira

hi,

I have a really strange problem.

If I type the file names in the script, or the variables are in the script, the image is created, I can save it (save as) and when I view the source code it seems fine.

When I use variables that come from another script (via POST) the image is created, but I can't save it (I can, but can't open it) and when I view the source code I get a lot of errors:

<br />
<b>Warning</b>:  imagecreatefromgif(../images/): failed to open stream: Permission denied in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>34</b><br />
<br />
<b>Warning</b>:  imagecreatefromgif(../images/): failed to open stream: Permission denied in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>35</b><br />
<br />

<b>Warning</b>:  imagecreatefromgif(../images/): failed to open stream: Permission denied in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>36</b><br />
<br />
<b>Warning</b>:  imagesx(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>38</b><br />
<br />
<b>Warning</b>:  imagesy(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>38</b><br />

<br />
<b>Warning</b>:  imagecopy(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>38</b><br />
<br />
<b>Warning</b>:  imagesx(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>41</b><br />
<br />

<b>Warning</b>:  imagesy(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>41</b><br />
<br />
<b>Warning</b>:  imagecopy(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>41</b><br />
<br />
<b>Warning</b>:  imagegif(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>43</b><br />

<br />
<b>Warning</b>:  imagedestroy(): supplied argument is not a valid Image resource in <b>c:\wamp\www\php\chicco\ecard\script\imagem.php</b> on line <b>45</b><br />

The php script:

<?php
header ("Content-type: image/gif");

// fundo
$fundo_im = $_POST['fundo_im'];

// boneco
$boneco_im = $_POST['boneco_im'];
$boneco_x = (int) $_POST['boneco_x'];
$boneco_y = $_POST['boneco_y'];

// acessorio
$acessorio_im = $_POST['acessorio_im'];
$acessorio_x = (int) $_POST['acessorio_x'];
$acessorio_y = (int) $_POST['acessorio_y'];


$fundo_im_res = imagecreatefromgif ('../images/' . $fundo_im);
$boneco_im_res = imagecreatefromgif ('../images/' . $boneco_im);
$acessorio_im_res = imagecreatefromgif ('../images/' . $acessorio_im);

imagecopy ($fundo_im_res, $boneco_im_res, $boneco_x, $boneco_y, 0, 0, imagesx ($boneco_im_res), imagesy ($boneco_im_res));

// adiciona outra imagem
imagecopy ($fundo_im_res, $acessorio_im_res, $acessorio_x, $acessorio_y, 0, 0, imagesx ($acessorio_im_res), imagesy ($acessorio_im_res));

imagegif($fundo_im_res);

imagedestroy ($fundo_im_res);
?>

The form to send the variables:

<form action="imagem.php" method="post" enctype="application/x-www-form-urlencoded">
      <input name="fundo_im" type="hidden" id="fundo_im" value="sfondo_1.gif" />
      <input name="boneco_im" type="hidden" id="boneco_im" value="personaggio_1.gif" />
      <input name="boneco_x" type="hidden" id="boneco_x" value="0" />
			<input name="boneco_y" type="hidden" id="boneco_y" value="0" />

		<input name="acessorio_im" type="hidden" id="boneco_im" value="oggetto_1.gif" />
  <input name="acessorio_x" type="hidden" id="boneco_x" value="0" />
		<input name="acessorio_y" type="hidden" id="boneco_y" value="0" />


<input type="submit" name="Submit" value="Submit" />
</form>

All necessary files attached.

bpat1434

Seems to me you need to CHMOD your dir (and possibly the file) to 0777 or 0666 in order to create the new images. If you take care of the "permission denied" errors, the others will go away.

The reason you get subsequent errors after the opening of the file is because nothing is returned, so your variable ($fundo_im) is not a valid image so the functions won't work. Get your permissions squared away, and you'll be golden.

~Brett

nunomira

hi,

Thank you for your reply.

I'm sorry but I didn't remember to say that I'm on Windows (I'm testing on my computer). And using Wampserver. It doesn't work with php 4 or 5.

The strange thing is that it works when the variables are sent using GET instead of POST.

Did you test the files? Did they work for you?

bpat1434

Wow... I'm not sure (Running Apache 2, PHP 5 on Windows) why it's like that. I suspect it has something to do with the fact that your php page sets the content type, and rather than using your image.php page in the src field of an image tag. That's my guess, I could be wrong.

~Brett

nunomira

Creating the image directly doesn't work, but creating the image and displaying it in the html, it works on the server (PHP 4.3.10 on Linux), which didn't work very well locally either.

On the server, even with error_reporting (E_ALL);, there are no errors.

But I'm still curious why it doesn't work locally with POST and works with get.