Implemented: DrawNonCurrentPage

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beandog
Posts: 33
Joined: Wed Dec 14 2005

Implemented: DrawNonCurrentPage

Post by beandog » Sat Feb 18 2006

Probably the #1 most-wanted feature for us is the ability to do DrawCurrentPage, but for pages besides the current page. That is, render an arbitrary page in a document to an HDC.

Joan
Amyuni Team
Posts: 2799
Joined: Wed Sep 11 2002
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Post by Joan » Tue Feb 21 2006

Here is a sample C++ code:

Code: Select all

/////////////////////////////////////////////////////////////////////////////
void CSample1::CreatePageBitmap( int pageNumber)
/////////////////////////////////////////////////////////////////////////////
{
	// m_pdf is the IPDFCreactiveX interface pointer

		//delete an existing bitmap
	if ( m_hBitmap != NULL )
	{
		DeleteObject( m_hBitmap );
		m_hBitmap = NULL;
	}

		//prepare memory dc that will be used to create the bitmap for this thumb
	HDC hScreenDC = GetDC( NULL );

	HDC hMemDC = CreateCompatibleDC( hScreenDC ); 
	m_hBitmap = CreateCompatibleBitmap( hScreenDC, m_size.cx, m_size.cy );
	
		//select the new bitmap into the memory dc
	HBITMAP hOldBitmap = (HBITMAP) SelectObject( hMemDC, m_hBitmap );
	
		//draw a grey border white filled rectangle to mark the bitmap's frame
	HPEN hPen = CreatePen( PS_SOLID, 1, RGB(127,127,127) ); //light gray pen
	HPEN hOldPen = (HPEN) SelectObject( hMemDC, hPen );
	Rectangle( hMemDC, 0, 0, m_size.cx, m_size.cy );
	SelectObject( hMemDC, hOldPen );
	DeleteObject( hPen );
	

		//copy the bitmap from a source dc to our memory dc, taking into account the border
	if ( m_pdf )
	{
		int   saveDC;
		int   oldMap;
		SIZE  oldWindow, oldView;

		saveDC = SaveDC( hMemDC );

		// set scale and origin
		oldMap = SetMapMode( hMemDC, MM_ISOTROPIC );

		// set scaling factor
		SetWindowExtEx( hMemDC, 2000, 2000, &oldWindow );
		SetViewportExtEx( hMemDC, acThumbnailCtrl::m_thumbSizeFactor, acThumbnailCtrl::m_thumbSizeFactor, &oldView );

		// switch to current page before drawing it
		long	savePage = m_pdf->GetCurrentPage();
		BOOL	saveRefresh = m_pdf->GetAutoRefresh();
		m_pdf->PutAutoRefresh( FALSE );
		m_pdf->PutCurrentPage( (long) pageNumber + 1/*pageNumber is zero-based*/ );
		m_pdf->DrawCurrentPage( (long) hMemDC, 0 );
		m_pdf->PutCurrentPage( savePage );
		m_pdf->PutAutoRefresh( saveRefresh );

		// reset previous scaling
		SetViewportExtEx( hMemDC, oldView.cx, oldView.cy, NULL );
		SetWindowExtEx( hMemDC, oldWindow.cx, oldWindow.cy, NULL );

		SetMapMode( hMemDC, oldMap );
		RestoreDC( hMemDC, saveDC );
	}
	else
	{
		BitBlt( hMemDC, 2, 2, m_size.cx - 4, m_size.cy - 4, hScreenDC, 0, 0, SRCCOPY );
	}
	
		//deselect the bimtap out of the mem dc and delete the mem dc
	SelectObject( hMemDC, hOldBitmap );
	DeleteDC( hMemDC );

		//release the source dc
	ReleaseDC( NULL, hScreenDC );
}

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