[mapserver-users] PHP $imgObj->saveImage(null) sends headers

[Pavel Iacovlev]

I get no errors with your code, and yes I have header() before output,
I use it with Zend Framework so it does the same thing with headers as
symphony does.

PHP 5.2.4-2ubuntu5.10 with Suhosin-Patch 0.9.6.2 (cli) (built: Jan  6
2010 22:01:14)
MapScript: 5.6.0 (will compile latest and test against it)

Error reporting:
error_reporting(E_ALL | E_STRICT);
ini_set('display_startup_errors', 1);
ini_set('display_errors', 1);

2010/4/5 Miloslav Kmeť <miloslav.kmet at gmail.com>:
> Hi I am sure, that I get an error with the latest code in this branch:
> https://svn.osgeo.org/mapserver/branches/branch-5-6/mapserver
>
> My PHP version is 5.3.2.
>
> Try this simple frameworkless php code:
>
> <?php
> error_reporting(E_ALL);
> ini_set('display_errors', 'on');
> $map = ms_newMapObj('./test.map'); // select your usual mapfile
> $img = $map->draw();
>
> ob_start();
> $img->saveImage(null);
> $data = ob_get_clean();
>
> header('Content-type: image/jpeg');
> echo $data;
> ?>
>
> The error is:
> Warning: Cannot modify header information - headers already sent in
> /www/test/buffer/mapserver/ob-reproduce.php on line 11
>
> I do not have a problem with collecting the data or using them. The problem is
> to send headers after $img->saveImage(null) call.
>
> Because of the symfony's framework behaviour - controller creates the data and
> the response later send them with additional headers I cannot send the headers
> before $img->saveImage();
>
> If you change your code and puts the header('Content-type: image/png'); before
> imagepng($image); you will see that error.
>
> Thank you for giving a try.
>
> On pondelok 05 Apríl 2010 19:37:02 you wrote:
>> Oh sorry, your code is correct thought you used ob_end_clean and you
>> are using ob_get_clean. But the snippet works for me with out any
>> phpmapscript modification.
>>
>> 2010/4/5 Pavel Iacovlev <iacovlev.pavel at gmail.com>:
>> > 1) Your php code is not correct I think, ob_get_clean  just cleans the
>> > output and does not return the captured content.
>> > 2) Try with no framework, maybe it sends some headers before you run your
>> > code.
>> >
>> > This works for me in Zend Framework in MVC mode, should work for symfony
>> > too. ob_start();
>> > $image->saveimage('');
>> > $image = imagecreatefromstring(ob_get_contents());
>> > ob_end_clean();
>> > imagepng($image);
>> >
>> > 2010/4/5 Miloslav Kmeť <miloslav.kmet at gmail.com>:
>> >> Hi. I am trying to use php_mapscript in MVC framework (symfony) and I
>> >> want to catch the output of $imgObje->saveImage(null); for the later
>> >> processing, eg: using the builtin cache mechanism instead of directly
>> >> writing the file to the cache.
>> >>
>> >> My code very simplified looks like:
>> >>
>> >> ob_start();                            // start output buffering
>> >> $imgObj->saveImage(null);  // print output to std
>> >> $image = ob_get_clean();   // get the buffer and clen it
>> >>
>> >> header('Content-type: image/jpeg'); // setting the header
>> >> echo $image; // printing the image
>> >>
>> >> At the header line I got an header already sended error, even no output
>> >> will be brinted before.
>> >>
>> >> I looked into php_mapscript.c and I found that in the saveImage function
>> >> there is php_header(TSRMLS_C); As I do not know the PHP internals, i do
>> >> not know what that call is doing, but when I removed it out, and
>> >> recompiled the extension,
>> >>
>> >> Now output buffering is working correctly.
>> >>
>> >> What is the function doing? Should it be replaced in the main
>> >> development?
>> >>
>> >> Thanks
>> >> --
>> >> Miloslav Kmeť
>> >>
>> >> _______________________________________________
>> >> mapserver-users mailing list
>> >> mapserver-users at lists.osgeo.org
>> >> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>> >
>> > --
>> > http://iap.md, The future is open
>
> --
> Miloslav Kmeť
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> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>



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