I need help - I can help - Page dimensions

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Page dimensions

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=3453
Printed Date: 01 May 24 at 2:25AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Page dimensions

Posted By: RaphQuin
Subject: Page dimensions
Date Posted: 17 Apr 17 at 9:13PM

I work with DebenuPDFLibraryDLL1212, Visual Studio on Windows 10 Pro.

I want to render pdf in a wpf image control.

I tried with :

internal Bitmap GetDAImage( int page, float resolution = 150 )
{
if ( _isOK ) // license OK
{
// on ouvre le fichier
_pdfInHandle = _dpl.DAOpenFileReadOnly( pdfIn, null );

// on récupère le nombre de page du fichier
_pdfPageCount = _dpl.DAGetPageCount( _pdfInHandle );

// on récupère la référence de la page du fichier
int pageRefNo = _dpl.DAFindPage( _pdfInHandle, page );

int Zoom = 72;
_pageWidth = _dpl.DAGetPageWidth( _pdfInHandle, pageRefNo ) / Zoom; ******** NOT OK
_pageHeight = _dpl.DAGetPageHeight( _pdfInHandle, pageRefNo ) / Zoom; ******** NOT OK

try
{
// on calcule les dimensions de l'image
b = new Bitmap( Convert.ToInt32( _pageWidth * resolution ), Convert.ToInt32( _pageHeight * resolution ) );

// on dessine l'image
using ( Graphics g = Graphics.FromImage( b ) )
{
//int dc = (int)g.GetHdc();
//_dpl.DARenderPageToDC( _pdfInHandle, pageRefNo, resolution, dc );
//g.ReleaseHdc( (IntPtr)dc );

IntPtr dc = g.GetHdc();
_dpl.DARenderPageToDC( _pdfInHandle, pageRefNo, resolution, dc );
g.ReleaseHdc( dc );
}
}
catch { }
}

return b;
}

I convert the bitmap to BitmapImage.

It's ok but 1 file has a problem (it came from Ricoh Aficio multifuntion).

It's a A4 format, and with pdf readers, I see it as A4 (no landscape) 21x29.7cm document.

But _dpl.DAGetPageWidth and _dpl.DAGetPageHeight give me wrong values: 29.7x21cm, not 21x29.7cm, so in my image, document is truncated in the bottom.

I inserted a new function in the beginning of my GetDAImage, to get real dimensions of the page :

internal int LoadPdf( string fileName )
{
_fileName = fileName;

if ( _isOK ) // license OK
{
// on charge le fichier à copier
_dpl.LoadFromFile( fileName, null );
_dpl.SelectedDocument();

// on redimensionne en A4
_dpl.SetPageSize( "A4" );
// on définit l'unité de mesure ( 1/72 inches per unit )
_dpl.SetMeasurementUnits( 0 );
// on définit l'origine en haut à gauche
_dpl.SetOrigin( 1 );

// on récupère le nombre de page du fichier
_pdfPageCount = _dpl.PageCount();

// on récupère les dimensions du document
_pageWidth = _dpl.PageWidth(); ******** OK
_pageHeight = _dpl.PageHeight(); ******** OK

int rotation = _dpl.PageRotation();
int test = _dpl.GetOrigin();
}

return _pdfPageCount;
}

Now it's ok.

So I tried without DA functions to avoid 2 openings :

internal Bitmap GetImage( int page, float resolution = 150 )
{
Bitmap b = null;

LoadPdf("myfile");

if ( _isOK ) // license OK
{
// on fait les vérification de la plages des pages
if ( page > _pdfPageCount )
return null;

int Zoom = 72;
_pageWidth /= Zoom;
_pageHeight /= Zoom;

try
{
// on calcule les dimensions de l'image
b = new Bitmap( Convert.ToInt32( _pageWidth * resolution ), Convert.ToInt32( _pageHeight * resolution ) );

// on dessine l'image
using ( Graphics g = Graphics.FromImage( b ) )
{
//int dc = (int)g.GetHdc();
//_dpl.DARenderPageToDC( _pdfInHandle, pageRefNo, resolution, dc );
//g.ReleaseHdc( (IntPtr)dc );

IntPtr dc = g.GetHdc();
_dpl.RenderPageToDC( resolution, page, dc );
g.ReleaseHdc( dc );
}
}
catch { }
}

return b;
}

And now I have got a new problem :

my left and top of the document is drawn with an surprising origin in my image control:

left = +200

top = -200

so I can see only the left bottom of my document.

The file seems to have a rotation of 270 with 21x29.7cm dimensions.

How can I fix this problem ?

Regards

Raph

Replies:

Posted By: Ingo
Date Posted: 17 Apr 17 at 9:23PM

Hi Raph,

you're right - there's a rotation setting.

So... before rendering the page was re-rotated into the original layout landscape.

The DIN A4 portrait is only the displayed state AFTER rotation.

Using the function NormalizePage you're telling the pdf that the actual displayed layout isn't made by rotation but it's the original layout.

After this function you won't have any problems while rendering:

http://www.debenu.com/docs/pdf_library_reference/NormalizePage.php

Cheers and welcome here,

Ingo

-------------
Cheers,
Ingo

Posted By: RaphQuin
Date Posted: 17 Apr 17 at 9:57PM

Hi Ingo,

thank you for your help.

I tried with

_dpl.NormalizePage( 0 );

and I still had my problem.

I finaly removed

_dpl.SetPageSize( "A4" );

and my problem disappeared. Clap

Thank you from France.

Regards

Raph.