| Re: Reading & Displaying Latex Rendered images [message #178564 is a reply to message #178556] |
Mon, 02 July 2012 10:53   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
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Senior Member |
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On 7/2/2012 2:42 AM, Fastian wrote:
> On Friday, June 29, 2012 6:20:45 PM UTC+5, Jerry Stuckle wrote:
>> On 6/29/2012 6:24 AM, Fastian wrote:
>>> I am developing an application for the university. One basic
>>> module/ section of this application is Data Entry. The data
>>> is entered using Latex (Latex is a type setting language
>>> and is not a WYSIWYG language). The tex software converts the
>>> latex code into the required image. For better understanding
>>> visit the following link:
>>> http://www.forkosh.com/mathtexpreview.html
>>>
>>> You can see that on entering Latex code, the desired output
>>> is obtained which is actually an image. This image is produced
>>> by the Tex software and is being fetched and displayed on this
>>> page. Another way to get that image is as follows:
>>> <img src="http://www.forkosh.com/mathtex.cgi?$c=a+b$" alt="" border=0 align=middle>
>>>
>>> My issue is that I want to get the image generated due to the
>>> rendering of the Latex code and then display it after re-sizing
>>> and then want store it in the MYSQL database.
>>>
>>> As I dont know the name of the image produced due to rendering
>>> that's why I can not pick the image with its name. Therefore I
>>> tried using function "file_get_contents". Though it returns
>>> some garbage values on echo but what next?
>>>
>>> I need to know that how can I proceed further or suggest some
>>> better way to deal with these issues especially while dealing
>>> with LateX rendering. Thanks!
>>>
>>
>> You don't show the code you're trying to use, so it's all a guess as to
>> what's wrong. There are many possibilities.
>>
>> If you're going to display an image, you need to send it as an image.
>> My guess is that you're displaying it as text.
>>
>> Web pages are sent with a content-type of text/html. But if the web
>> page contains an image, the browser makes a second request to the server
>> for the image. The image will be sent with a content-type of
>> image/jpeg, image/gif, etc. So the first thing you need to do is ensure
>> you are sending the correct header when displaying it (in this case it
>> should be image/gif) (obviously this needs to be done in a separate
>> script from the rest of the page and accessed with an <img= tag).
>>
>> So what you could do is in your test page, put something like:
>>
>> <img src="testimg.php" ....>
>>
>> Then in your testimg.php file, fetch the file with file_get_contents
>> then display it with the correct headers, i.e.
>>
>> header ('Content-type: image/gif');
>>
>> Of course, if this is the only thing on your test page (it's sending
>> NOTHING else), you can skip the <img= ...> tag and just send the correct
>> content-type at the start of your script.
>>
>> --
>> ==================
>> Remove the "x" from my email address
>> Jerry Stuckle
>> JDS Computer Training Corp.
>> jstucklex(at)attglobal(dot)net
>> ==================
>
> Pls have a look on the code:
> As you suggested my testing.php file code is as follows:
>
> <?
> $image = file_get_contents('users.gif');
>
> header('Content-Type: image/gif');
>
> //imagegif($image); // I also tried to display image with imagegif but it also didnt work.
>
> ?>
> The code of getimage.php file is as follows:
> <html>
> <img src="testing.php">
> </html>
>
> But the image is NOT displayed on the browser.Where I am wrong?
> Both php files and image (users.gif) is present in the same directory.
> I have also noticed that <img src= ""> do not work on the page where you have used header('Content-Type: image/gif'); ......... why?
>
Where are you outputting the image? file_get_contents() does not output
anything.
And no, <img src=..."> is an html command, and valid in pages with
content-type of text/html.
I think your first problem is not understanding how html works. A
response has one content-type. A typical web page will have a
content-type of text/html, and will contain html code. <img src=...> is
an html command.
Tags like <img src=...> (and many others) will cause an additional
request to be made to the server. If the content-type of the response
is image/gif, then the browser will only process it as an image. If it
is not a valid image, the browser will ignore it.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================
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