C / C++ / MFC

Printing in MFC [modified]

3-Aug-07 16:15

In regards to what Mr. Dunn stated, here is how to zero init your structures in case you haven't seen it before in a code example...

INITCOMMONCONTROLSEX InitCtrlEx={0};

hxhl953-Aug-07 12:30

3-Aug-07 12:30

Printing in MFC seems so tricky to do...Right now I'm working on a notepad like program and the print function in it. I haven't been working on the function for a few months already. Seems like I forgot what everything does in it. But the problem I'm having now is I can't get the number of pages to print.

I copied this off some site:

CDC printerDC;
printerDC.Attach (printpage.GetPrinterDC ());
DOCINFO di;
::ZeroMemory (&di, sizeof (DOCINFO));
di.cbSize = sizeof (DOCINFO);
di.lpszDocName = filename;
printerDC.SetMapMode (MM_LOENGLISH);
CPrintInfo docInfo;
docInfo.SetMinPage(docInfo.GetMinPage());
docInfo.SetMaxPage(docInfo.GetMaxPage());

and it doesn't work at all. Anyone have any pointers as to how I can get the minpage and maxpage values? And also can anyone explain the functions for printing? I'm still a bit confused... Sigh | :sigh:

Edit: I found some great code on the internet, now all I need is some function to get the number of lines in my editbox...Is that any better than the number of pages? Confused | :confused:

-- modified at 21:59 Friday 3rd August, 2007

bob169723-Aug-07 16:02

3-Aug-07 16:02

You can use your OnDraw() functions to print with if you stand on your head just right. Start an MFC (Visual C++ 6.0) Doc/View app deriving from CScrollView. Add the necessary code sections below using the ClassWizard and make sure they resemble the code below. The demo shows how to use the OnDraw for both drawing in a view and to the printer. It uses an arbitrary world coordinate system with MM_ISOTROPIC. It demonstrates how to let the OnDraw know which page is being displayed or printed so OnDraw can adapt it's drawing accordingly. It will fit the drawing to the output device while preserving the documents aspect ratio. I left the centering of the drawing in the device as an exercise for you. (Hint, center/align the viewport and the window with respect to each other).
I also did not reset the m_nPage after printing, error checking etc...

Let me know if I forgot something.
Hope this helps!

//CDocument members...

// Header file .h
protected:
CSize m_DocSize;

// Implementation file .cpp
CSize CYourDoc::GetDocSize() const
{
return m_DocSize;
}

CYourDoc::CYourDoc()
{
// TODO: add one-time construction code here
m_DocSize=CSize(2000,2800);
}

//CScrollView members...

// Header file .h
private:
int m_nPage;

// Implementation file .cpp
CYourView::CYourView()
{
// TODO: add construction code here
SetScrollSizes(MM_TEXT,CSize(0,0)); // Set arbitrary values

m_nPage=1;
}

/***************************************
NOTE: The pInfo parameter is uncommented
****************************************/
void CYourView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* pInfo)
{
// TODO: add extra initialization before printing
pInfo->SetMaxPage(3);
}

void CYourView::OnPrint(CDC* pDC, CPrintInfo* pInfo)
{
// TODO: Add your specialized code here and/or call the base class
m_nPage=pInfo->m_nCurPage;

CScrollView::OnPrint(pDC, pInfo);
}

void CYourView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
CScrollView::OnPrepareDC(pDC);

// TODO: Add your specialized code here and/or call the base class

// Set up the DC for the current scale factor
int nExtentX;
int nExtentY;
CSize sizeDoc;
CRect rectClient;

pDC->SetMapMode(MM_ISOTROPIC); // Allow scaling with aspect ratio preserved

// Get pertinent rectangle data
GetClientRect(&rectClient);
sizeDoc=GetDocument()->GetDocSize();

sizeDoc.cy=(-sizeDoc.cy); // Y goes down as it increments
pDC->SetWindowExt(sizeDoc); // Window extent is size of document

// Calculate viewport extent
nExtentX=rectClient.Width();
nExtentY=(int)((nExtentX*sizeDoc.cy)/(sizeDoc.cx));

// What kind of device context do we have?
if (pDC->IsPrinting()==TRUE) {
pDC->SetViewportExt(pDC->GetDeviceCaps(HORZRES),-pDC->GetDeviceCaps(VERTRES));
} else {
// Context is for screen
pDC->SetViewportExt(nExtentX,nExtentY);
}
}

void CYourView::ResetScrollBars()
{
CSize sizeDoc;
CClientDC dc(this);

this->OnPrepareDC(&dc); // Update the device context

sizeDoc=GetDocument()->GetDocSize();
dc.LPtoDP(&sizeDoc); // Logical to device

this->SetScrollSizes(MM_TEXT,sizeDoc); // Update scrollbars
}

void CYourView::OnSize(UINT nType, int cx, int cy)
{
CScrollView::OnSize(nType, cx, cy);

// TODO: Add your message handler code here
ResetScrollBars();
}

void CYourView::OnDraw(CDC* pDC)
{
CTestPrintDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here

CSize sizeDoc=pDoc->GetDocSize();
CRect rectOutline(0,0,sizeDoc.cx,sizeDoc.cy);
rectOutline.DeflateRect(10,10); // Ensure we can see it

LOGFONT logFont={0};
memcpy(logFont.lfFaceName,"Arial",6);
logFont.lfHeight=300;

CFont font;
font.CreateFontIndirect(&logFont);

CFont* pOldFont=pDC->SelectObject(&font);
CBrush* pOldBrush=(CBrush*)pDC->SelectStockObject(NULL_BRUSH);
CString sMessage;
sMessage.Format("You can add code to center the printout later\nPage %d",m_nPage);
pDC->DrawText(sMessage,&rectOutline,DT_CENTER|DT_WORDBREAK);

pDC->Rectangle(&rectOutline);

pDC->SelectObject(pOldFont);
pDC->SelectObject(pOldBrush);
}

hxhl953-Aug-07 19:32

3-Aug-07 19:32

Ehhh...I'm new at MFC...and I think my original post wasn't very clear. What I need right now is a way to get the number of lines a user types into a CEdit editbox, not a preview and a bunch of other things that look like scrollbar stuff...I already have a pretty good class for printing I got off the net. Just need the number of lines in a CEdit editbox.

bob169724-Aug-07 3:41

4-Aug-07 3:41

I apologize if that code doesn't help. I had thought you asked for an explanation of how printing and pages work in MFC. A picture paints a thousand words so I thought a little working demo would help explain the paging mechanism in MFC.

Sorry for the misunderstanding.

hxhl954-Aug-07 6:36

4-Aug-07 6:36

No, it's ok. I did ask for an explanation of printing in MFC, and your code shows that pretty well but it doesn't do what I need. Thanks anyway. I get the idea of printing now.

bob169723-Aug-07 16:25

3-Aug-07 16:25

In regards to your modified post, if you desire to calculate how many pages it will take to print your document, then you need to calculate some metrics to figure that out.

I think I misunderstood your original post. Are you using CEditView for your view class or a CScrollView? If your using CEditView, you really don't need to do anything as it is a mini pre-wrapped Notepad application and will print as is.

hxhl954-Aug-07 6:42

4-Aug-07 6:42

If I remember correctly, CEditView and CScrollView are used for previewing...? I hardly ever use them, not too familiar. What I'm doing here is I'm getting a CString of all the text in the editbox (CEdit), then printing the CString line by line in a loop. That's why I need the number of lines Wink | ;)

. I'm not using CEditView or CScrollView here.

bob169724-Aug-07 8:38

4-Aug-07 8:38

Did you try CEdit::GetLineCount() and CEdit::GetLine()

I'm guessing it won't help too much though since the line count is probably based on it's visual representation in the CEdit window. Font metrics are quite tricky when attempting a WYSIWYG application on any arbitrary device; Especially with line breaks and font grid fitting involved.

However, it may be what your after so I thought I'd post it if you haven't come across it in MSDN yet.

Hope that helps.

Bram van Kampen5-Aug-07 3:11

Bram van Kampen

5-Aug-07 3:11

Ever thought of Counting the Lines? (as in counting the number of'\n' chars in the CString? )

LateNightsInNewry

hxhl955-Aug-07 9:56