PRINTDLG to CPrintInfo

[Lost User]

Flaviu2 wrote:

Could you tell me how ?

Sorry, no, I have never tried such a thing.

[_Flaviu]

Ok, no pb, I have to digg in ... :)

[_Flaviu]

Richard, I still have a question: I had tried to create manually an CPrintInfo object, just like that:

	CPrintDialog pdlg(FALSE);
	pdlg.GetDefaults();
	HDC hDC = pdlg.CreatePrinterDC();
	if(NULL != hDC)
	{
		m\_pPreviewInfo = new CPrintInfo;
		m\_dcPrint.CreateCompatibleDC(CDC::FromHandle(hDC));
		m\_pPreviewInfo->m\_rectDraw.left = 0;
		m\_pPreviewInfo->m\_rectDraw.top = 0;
		m\_pPreviewInfo->m\_rectDraw.right = m\_dcPrint.GetDeviceCaps(HORZRES);
		m\_pPreviewInfo->m\_rectDraw.bottom = m\_dcPrint.GetDeviceCaps(VERTRES);
		m\_pPreviewInfo->m\_bContinuePrinting = TRUE;
		m\_pPreviewInfo->m\_bDirect = TRUE;
		m\_pPreviewInfo->m\_bDocObject = FALSE;
		m\_pPreviewInfo->m\_bPreview = TRUE;
		m\_pPreviewInfo->m\_lpUserData = NULL;
		m\_pPreviewInfo->m\_pPD = &pdlg;
		m\_pPreviewInfo->SetMinPage(1);
		m\_pPreviewInfo->SetMaxPage(2);
		m\_nPages = m\_pPreviewInfo->m\_nNumPreviewPages;
		m\_pPreviewDC = new CPreviewDC;
		m\_pPreviewDC->SetAttribDC(m\_pPreviewInfo->m\_pPD->m\_pd.hDC);
		m\_sizePrinterPPI.cx = m\_dcPrint.GetDeviceCaps(LOGPIXELSX);
		m\_sizePrinterPPI.cy = m\_dcPrint.GetDeviceCaps(LOGPIXELSY);

		m\_nPages = m\_pPreviewInfo->m\_nNumPreviewPages;
		if (m\_nPages == 0)
			m\_nPages = 1;
		else if (m\_nPages > m\_nMaxPages)
			m\_nPages = m\_nMaxPages;     // Sanity Check!
	}

where m_pPreviewInfo and m_pPreviewDC is protected members of CMyCustomPrintPreview:

CPreviewDC\* m\_pPreviewDC;
CPrintInfo\* m\_pPreviewInfo;

of the first sight, I had do something wrong on the above code ? Because when I am trying to use m_pPreviewInfo object in CMyCustomPrintPreview::OnDraw, is crashing and I get an access violation on:

_AFXEXT_INLINE UINT CPrintInfo::GetMaxPage() const
{ return m_pPD->m_pd.nMaxPage; }

Thank you.

[Lost User]

I suspect that your CPrintDialog object is going out of scope thus causing this error. You should use new to create it before adding it to your CPrintInfo.

[_Flaviu]

Yes, that was it ... :) Thank you. I am go with one step further ... I come beck soon.

[_Flaviu]

Yes, I had created dinamically (with new), but when I am trying to clean up in my class destructor, it crashing ...

CPrintPreview::~CPrintPreview
{
if(NULL != m_pPrintDlg)
delete m_pPrintDlg; // crash ! <----
}

weird ...

[Lost User]

Are you sure that your CPrintInfo object still exists at this point?

[_Flaviu]

I am sure that is not null ... is not enough ? How can assure of CPrintInfo existence ?

[Lost User]

It should be enough, but if it has somehow been corrupted, or already deleted then you will get a crash. The only way to check is via the debugger.

[_Flaviu]

Thank you Richard, deleteing CPrintInfo object is excluded, the destructor is the only place where I explicity delete this object ... I have to dig in ...