The initial problem is still there - changes are not rendered in the document
until it is saved, so how do I commit inline changes to stream to the
browser? This is a common problem I am sure, to stamp a document with a
watermark before rendering it to the browser, but without changing the
original document. It is possible to work around by creating a temporary
file, then streaming that, but this causes potential file access conflicts
from users requesting the same file, and housecleaning and potential
permission problems that should not be there - plus it adds significant
overhead to an already memory intensive operation (it takes a while to read,
watermark, save, and re-read an 800 page PDF).
If anyone has any insight, please help out a Zend framework newb.
Regards,
Tim Everson
Tim Everson wrote:
>
> I am trying to modify a document in memory and then render the result to
> the browser without actually changing the document. This sounds easy,
> with Zend_pdf->render(), but I am finding that my changes to the document
> are not in the rendered document. So to workaround, I assume I must save
> the document to a temporary file, then open THAT file in a new zend_pdf
> object and render it to the browser, right? Wrong again. I am baffled to
> find that the originally opened document is actually rendered instead, no
> changes applied. After the script runs, if I manually open the temporary
> PDF file it created, my changes are there.
>
> Is there some sort of commit action that must be performed to get the
> changes to render before the script ends? I cannot find an instance of
> anyone talking about this before - maybe its just me. Here's my code:
>
> if(isset($argv[1])){
> $srcPDF = $argv[1];
>
> try{
> $ZendPDF = & new Zend_Pdf($srcPDF, 0, true);
> /**
> * Stamp each page "UNRELEASED" in transparent gray Helvetica
> */
>
> $font = Zend_Pdf_Font::fontWithName(Zend_Pdf_Font::FONT_HELVETICA);
> $color = new Zend_Pdf_Color_Html('#000000'); //black
>
> foreach($ZendPDF->pages AS $PDFpg){
> //calculate the fontsize to use based on the dimensions of the page
> $fontSize = intval($PDFpg->getHeight() / 10);
> $PDFpg->rotate(($PDFpg->getWidth() / 2), ($PDFpg->getHeight() / 2),
> 45)
> ->setFont($font, $fontSize)
> ->setFillColor($color) //also sets font color
> ->setAlpha(0.2) //half opaque
> ->drawText('U N R E L E A S E D', ($PDFpg->getWidth() / 2) -
> (4 * $fontSize), ($PDFpg->getHeight() / 2) - ($fontSize / 2) );
> }
>
>
> //page changes are NOT committed at this point
> echo $ZendPDF->render(); //renders string data back to caller
> unset($ZendPDF);
>
> }
> catch (Zend_Exception $e) {
> die("Caught exception: " . get_class($e) . "\n" . "Message: " .
> $e->getMessage() . "\n");
> }
> } else {
> die("No source file");
> }
>
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