On May 18, 2:28 pm, AD7six <andydawso...@gmail.com> wrote:
> On Friday, 18 May 2012 18:09:35 UTC+2, Josh M wrote:
>
> > Hello all,
>
> > I am having issues using the DOMPDF pdf generation library in my
> > Cake 2.1 application. I am building an inventory management
> > application for use at my company and I am trying to dynamically
> > generate pdfs my users can print as stock labels. However, when I
> > attempt to stream to pdf in my view I get a "Headers already sent"
> > error. I have already removed all leading and trailing spaces from
> > the view and the DOMPDF include file. I am also using the ajax layout
> > which does not preface the content with any html markup. I guess that
> > cake is sending headers somewhere in the view rendering process that I
> > can't see. Below is the code for my controller function and my view:
>
> > Controller method:
> > public function printSingleLabel($id = null){
> > if($id === null){
> > $this->Session->setFlash('No ID provided to print label');
> > $this->redirect(array('action'=>'index'));
> > }else{
> > $this->set('stockItem', $this->StockItem->find('first',
> > array(
> > 'recursive'=>3, 'conditions'=>array(
> > 'StockItem.id'=>$id
> > )
> > )));
> > $this->set('quantity', 15);
> > $this->render('printSingleLabel', 'ajax');
> > }
> > }
>
> > View file:
> > <?
> > require_once("dompdf/dompdf_config.inc.php");
> > $html = <<<EOD
> > <html>
> > <head>
> > <title></title>
> > <meta http-equiv="Content-Type" content="text/html;
> > charset=UTF-8">
> > <style>
> > @page {
> > margin: 0in 0in 0in 0in;
> > }
> > body {
> > margin: 0in;
> > padding: 0in;
> > font-size:8pt;
> > font-family: Arial, Sans-Serif;
> > }
> > div {
> > float:left;
> > /*width:2.75in;*/
> > padding:0in;
> > /*height:2.125in;*/
> > margin:0in;
> > }
>
> > div.center {
> > margin-left: 0.135in;
> > margin-right: 0.135in;
> > }
> > </style>
> > </head>
> > <body>
> > <div>
> > <strong>{$stockItem['Part']['number']} Rev {$stockItem['StockItem']
> > ['revision']}</strong>
> > <br/>
> > {$stockItem['Part']['name']}
> > <br/>
> > <strong>Lot/Batch:</strong>{$stockItem['StockItem']['lot']}/
> > {$stockItem['StockItem']['batch']}<br/>
> > <strong>Expires:</strong>{$stockItem['StockItem']['exp_date']}<br/
>
> > <strong>Status:</strong>{$stockItem['Status']['code']}<br/>
> > <strong>Quantity:</strong>$quantity{$stockItem['Part']['Uom']
> > ['code']}<br/>
> > </div>
> > </body></html>
> > EOD;
> > $pdf = new DOMPDF();
> > $pdf->set_paper(array(0,0,153,198), 'landscape');
> > $pdf->load_html($html);
> > $pdf->render();
> > $pdf->stream("sample.pdf", array('Attachment'=>0));
>
> > I've spent a whole afternoon trying to track down where the headers
> > are being sent with no luck. If anyone has a suggestion I'd greatly
> > appreciate it.
>
> Read the error message?
>
> Warning: Cannot modify header information - headers already sent by (output
> started at ***/this/file*:*on this line***) in /irrelevant.php
>
> AD
The error is being generated by DOMPDF and reads exactly this: "Unable
to stream pdf: headers already sent" It does not tell me where the
headers were sent. I used this same template to create pdfs in
another application that didn't use the CakePHP framework and I got no
such error.
Let me ask this another way: I submit a request through the client
for a controller method. That method performs some logic and passes
data off to a view to be rendered. Are headers sent at any point
before the contents of the view are rendered? I attempted to create a
controller that performed no logic and created a view that contained
only a single line of code: <? header('Location: http://google.com'); ?
> When I request that action my browser simply renders a blank page.
No redirect, no error. I don't understand how this could happen. I
should either get a redirect to google or an error, but I get
neither. My error reporting is set to E_ALL and E_DEPRECATED.
I'm new to web development and CakePHP so I suspect I'm missing
something obvious here, but I'm out of ideas.
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