| Re: Reading & Displaying Latex Rendered images [message #178565 is a reply to message #178564] |
Mon, 02 July 2012 11:24   |
Fastian
Messages: 20
Registered: June 2012
Karma:
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Junior Member |
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On Monday, July 2, 2012 3:53:13 PM UTC+5, Jerry Stuckle wrote:
> 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
> ==================
Ok. I got your point. But as it is the requirement of my project to store the complete question as an image in addition to storing latex text. Therefore I need to process the images (both question + options) and have to make them
transform into a complete question.
Therefore I thought that file_get_contents() may be helpful in this case as it then enable me to use imagecopy () and other functions. what you say?
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