Page dimensions

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   Hi
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