 Get A Image Indentifier With Gd Library, GD library question |
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 Oct 7 2007, 05:21 PM
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#1
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Newbie [Level 1]  Group: [HOSTED] Posts: 21 Joined: 29-September 07 Member No.: 50,836  |
Hey fellow coders,
I'm having a problem. If you output a im indentifier in php with gd libary. With this method for example: CODE <? header("(anti-spam-(anti-spam-(anti-spam-content-type:))) image/png"); $imgWidth = 50; $imgHeight = 50; $image=imagecreate($imgWidth, $imgHeight); $colorBlack = imagecolorallocate($image, 0, 0, 0); // first color you define with colorallocate is also the color of the background of your image imagepng ($image); imagedestroy ($image); // This gives you a page with a black image of 50x50 pixels. ?> If i look at the source code of that page, i see: QUOTE �JFIF�������;CREATOR: gd-jpeg v1.0 (using IJG JPEG v62), quality = 70 �C� # %$" "!&+7/&)4)!"0A149;>>>%.DIC<H7=>;�C ;("(;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;��n�"�� ���������� ����}�!1AQa"q2#BR$3br %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz � ������� ���w�!1AQaq"2B #3Rbr $4%&'()*56789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz � ��?�( ( I get something similair to that. Now my question: How can i get back the image indentifier (the var $image in the sample code above), with only this weird code ?? Thanks very much in advance, Though i fear not many people here know how this can be done  [size="3"][/size]
This post has been edited by Stenno: Oct 7 2007, 08:02 PM |
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Oct 7 2007, 07:35 PM
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#2
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Ephesians 6:10-17  Group: [MODERATOR] Posts: 1,918 Joined: 22-June 05 From: The World of Gentoo Member No.: 8,528 |
Replace the first instance of the image variable with
CODE $image = @imagecreate($imgWidth, $imgHeight); Then check the page out again. |
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Oct 7 2007, 08:01 PM
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#3
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Newbie [Level 1] Group: [HOSTED] Posts: 21 Joined: 29-September 07 Member No.: 50,836 |
Ohw sorry, thanks for warning. But that's not my question. It's just a quick sample script to explain my question better. Please read it carefully: i would like to know how i can recreate an image with only the weird data (in the quotes).
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Oct 8 2007, 12:02 AM
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#4
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Ephesians 6:10-17 Group: [MODERATOR] Posts: 1,918 Joined: 22-June 05 From: The World of Gentoo Member No.: 8,528 |
The weird data should be the image itself, it's like opening up an image in an ascii editor. Check out these functions: imagecreatefrompng, imagecreatefromjpeg, imagecreatefromgif, etc..
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Oct 8 2007, 05:20 AM
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#5
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Newbie [Level 1] Group: [HOSTED] Posts: 21 Joined: 29-September 07 Member No.: 50,836 |
QUOTE imagecreatefromjpeg Create a new image from file or URL And i don't have a file, i only have a string with those weird chars. Or maybe there is some function to create a file first and then use imagecreatefromjpeg() ?? |
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Oct 8 2007, 05:31 AM
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#6
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A computer once beat me at chess, but it was no match for me at kick boxing. Group: [MODERATOR] Posts: 4,081 Joined: 24-July 05 From: Linix, DOS and Windowsthe good, the bad and the ugly Member No.: 9,787  |
Sten,
Maybe simply tell us exactly what you are trying to do here. You appear to be writing a script to dynamically create an image. And now you want to save it? Why? Just use the script when you need the image... If you really need to save a copy of the actual Image, run that script in your Browser and do a rt-click, save image as... to save it to your desktop. That's the beauty of the script, you don't need to save the image 
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Oct 8 2007, 05:56 AM
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#7
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apt-get moo Group: [MODERATOR] Posts: 2,153 Joined: 28-May 05 From: Devon, England Member No.: 7,593 |
QUOTE(Stenno @ Oct 7 2007, 06:21 PM)  Now my question: How can i get back the image indentifier (the var $image in the sample code above), with only this weird code ?? Put simply, I don't think you can. What you are asking to do is something similar to opening a binary file in a text editor, saving it, then trying to run it as a binary file - it just can't be done. For example, if you open the TuxKart binary in Kate, you get something like the following repeated for 8000 lines: CODE ELF ��4 d� 4 ( 4 4�4� 4 4�4� � �E� E� � p p\ �, � ȘȘ H H�H� P�td� ����<B <B Q�td /lib/ld-linux.so.2 GNU � _ ( � � ) > � � G ( � � � 5 � � � � � � : / 6 � i � 2 � e - � � � ] p u j : � � � � � There is absolutely no way to turn that back into the binary to be able to use it again. This is pretty much what you are asking to do with your image. Perhaps if you explained why you need to convert the 'code' back into the variable, we might be able to give you a different method. |
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Oct 9 2007, 02:33 PM
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#8
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Newbie [Level 1] Group: [HOSTED] Posts: 21 Joined: 29-September 07 Member No.: 50,836 |
I already found the method to retrieve an image indentifier with only the weird code. It's like this:
CODE <? $data = 'iVBORw0KGgoAAAANSUhEUgAAABwAAAASCAMAAAB/2U7WAAAABl' . 'BMVEUAAAD///+l2Z/dAAAASUlEQVR4XqWQUQoAIAxC2/0vXZDr' . 'EX4IJTRkb7lobNUStXsB0jIXIAMSsQnWlsV+wULF4Avk9fLq2r' . '8a5HSE35Q3eO2XP1A1wQkZSgETvDtKdQAAAABJRU5ErkJggg=='; //$data is the base64_encoded weird data $data = base64_decode($data); $im = imagecreatefromstring($data); if ($im !== false) { header('(anti-spam-content-type:) image/png'); imagepng($im); } else { echo 'An error occurred.'; } ?> Thanks for your help though, and sorry for the weird explenation |
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