[fw-general] Imageoutput problems with Zend_Cache

[Kai Meder]

Hello,

I am trying to create an Image-proxy which caches image-urls on disk and 
outputs these jpegs to the browser.
The following code wont work. On the first Cache Miss, the image is 
properly shown. On each following Cache Hit, the image is not displayed 
(invalid data). The cache file on disk contains the proper jpeg-image, 
at least irfanview recognizes it being jpeg...

Any hint? Thanks!
Kai

$frontend = 'Output';
$frontendOpts = array(
'caching' => true,
'cache_id_prefix' => 'ImageServiceProxy_',
'lifetime' => NULL,
'ignore_user_abort' => true
);

$backend  = 'File';
$backendOpts = array(
'cache_dir' => CACHEDIR,
'read_control' => false,
'hashed_directory_level' => 3,
);

$cache = Zend_Cache::factory($frontend, $backend, $frontendOpts, 
$backendOpts);


header('Content-Type: image/jpeg');

if (!$cache->load($cacheID)) {

$http = new Zend_Http_Client($url);
$http->setHeaders('User-Agent', $_SERVER['HTTP_USER_AGENT']);
	$http->setHeaders('Referer','http://' . $http->getUri()->getHost() 
. '/');

$res = $http->request('GET');
$img = $res->getRawBody();

imagejpeg(imagecreatefromstring($img));

$cache->end();
}
exit;

[fw-general] Imageoutput problems with Zend_Cache

[Kai Meder]

Hello,

I am trying to create an Image-proxy which caches image-urls on disk and 
outputs these jpegs to the browser.
The following code wont work. On the first Cache Miss, the image is 
properly shown. On each following Cache Hit, the image is not displayed 
(invalid data). The cache file on disk contains the proper jpeg-image, 
at least irfanview recognizes it being jpeg...

Any hint? Thanks!
Kai

$frontend = 'Output';
$frontendOpts = array(
'caching' => true,
'cache_id_prefix' => 'ImageServiceProxy_',
'lifetime' => NULL,
'ignore_user_abort' => true
);

$backend  = 'File';
$backendOpts = array(
'cache_dir' => CACHEDIR,
'read_control' => false,
'hashed_directory_level' => 3,
);

$cache = Zend_Cache::factory($frontend, $backend, $frontendOpts, 
$backendOpts);


header('Content-Type: image/jpeg');

if (!$cache->load($cacheID)) {

$http = new Zend_Http_Client($url);
$http->setHeaders('User-Agent', $_SERVER['HTTP_USER_AGENT']);
$http->setHeaders('Referer','http://' . 
$http->getUri()->getHost() . '/');

$res = $http->request('GET');
$img = $res->getRawBody();

imagejpeg(imagecreatefromstring($img));

$cache->end();
}
exit;

[fw-general] Header-Problems with Zend_Controller_Response_Abstract

[Kai Meder]

Hello,

I do want an ImageService to get cached by the client.

$ETag = md5($h);
$this->res
->setHeader('Cache-Control', 'public', true)
->setHeader('Pragma', 'public', true)
->setHeader('Expires', gmdate("D, d M Y H:i:s",
time()+3600*24*365).' GMT', true)
->setHeader('ETag', $ETag, true);

if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
$_SERVER['HTTP_IF_NONE_MATCH'] == $ETag) {

//header('HTTP/1.1 304 Not Modified');
//$this->res->setHttpResponseCode(304);
$this->res->setRawHeader('HTTP/1.1 304 Not Modified');
return true;
}

This does not work. I think the Cache-Control, Pragma and Expires 
headers, which seem to have been manually set by the Zend-Framework, do 
affect the Cache-Behavior.
I can`t remove them, so is my overwriting OK to enforce the Browser to 
cache?
Secondly, I can`t properly set the Header 304, the client does not cache 
the images...


Any Hints?

Thanks,
Kai

[fw-general] Header-Problems with Zend_Controller_Response_Abstract

[Kai Meder]

Hello,

I do want an ImageService to get cached by the client.

$ETag = md5($h);
$this->res
->setHeader('Cache-Control', 'public', true)
->setHeader('Pragma', 'public', true)
->setHeader('Expires', gmdate("D, d M Y H:i:s",
time()+3600*24*365).' GMT', true)
->setHeader('ETag', $ETag, true);

if (isset($_SERVER['HTTP_IF_NONE_MATCH']) &&
$_SERVER['HTTP_IF_NONE_MATCH'] == $ETag) {

//header('HTTP/1.1 304 Not Modified');
//$this->res->setHttpResponseCode(304);
$this->res->setRawHeader('HTTP/1.1 304 Not Modified');
return true;
}

This does not work. I think the Cache-Control, Pragma and Expires
headers, which seem to have been manually set by the Zend-Framework, do
affect the Cache-Behavior.
I can`t remove them, so is my overwriting OK to enforce the Browser to
cache?
Secondly, I can`t properly set the Header 304, the client does not cache
the images...

Any Hints?

Thanks,
Kai

Re: [fw-general] Difference between Zend_Db_Table and Zend_Db_Table_Abstract

[Kai Meder]

xing93111 wrote:

What's the difference between Zend_Db_Table and Zend_Db_Table_Abstract? My
code can extend either one and it works.


I think the only reason is the Namespace-style.
The class a_b_c is stored in the filesystem like a/b/c.
So Zend_Db_Table_Abstract is the main class containing the base logic.
Zend_Db_Table merely initiates the Namespace...

So long,
Kai

Re: [fw-general] Zend_PDF: creating a template PDF and replacing placeholders

[Kai Meder]

Willie Alberty wrote:
Although you can open a PDF file in a text editor and more or less 
follow its structure, it is not a text file. PDF documents are binary 
files. You can irreparably damage a PDF by doing string replacement 
operations.


The reason for this is the document trailer which appears at the end of 
every PDF file. This is an array of byte offsets to the various objects 
contained within the document. If you do a string replacement that 
changes the byte length of the string, you've wrecked this offsets 
table, and the PDF viewer will be unable to read the document.


If you're very careful to maintain the byte length of the strings you're 
replacing, you can actually change existing PDF content in this way, but 
you're treading on thin ice. If you keep the byte offsets in document 
trailer updated, you can change string lengths too, but this gets to be 
rather difficult.


thanks for that thorough explanation and thanks for the fop-link, 
thomas. will take a look at it.


thanks,
kai

[fw-general] Zend_PDF: creating a template PDF and replacing placeholders

[Kai Meder]

Hello,

does anyone know a good solution to:
- create a fully designed PDF template (e.g. from MS Publisher)
- replace embedded placeholders in this PDF to bulk-create PDFs.

It seems any PDF I create contains a binary data-stream and no raw-text 
whatsoever. So whats the best way to create such Template-PDFs?

Is there any official Variable/Placeholder Syntax for PDFs?

Thanks!
Kai

Re: [fw-general] view auto quoting

[Kai Meder]

it works when directly outputting in the view-script
*without* the helper like:


var SNAME = "";
var SID   = "";

var ROLES = roles); ?>;


yours,
kai

Re: [fw-general] view auto quoting

[Kai Meder]

Matthew Weier O'Phinney wrote:

Not happening in Zend_View, unless you're registering any filters with
the Zend_View object. It may be happening in Zend_Json::encode(), but it
should only be occurring if the value is a string.
no filters registered at all. double-checked via 
var_dump($this->getFilters());



How are you calling the helper? simply as:

$this->roles is array from db-select
json() is kindof shortcut to Zend_Json::encode

jsVar('ROLES', json($this->roles)); ?>

which results in:
var ROLES = 
"{\"Writer\":{\"role\":\"Writer\"}}";


full helper-source:
';
echo 'var ' . $name . ' = ';
echo json($value);
echo ';';
echo '';
echo "\n";
}
}

the whole thing is quoted twice and it seems to be the view's fault.
i have several ajax-controller which have no views and directly output 
the json-objects in the actionAction()-methods like so:

echo json($db-selected-stuff);
it works as expected.

in the view-script the output is messed/quoted up and i have *no* idea 
where to look for this strange behaviour.


any ideas?
kai