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Very Simple Print Preview without the Doc/View architecture

, 9 Aug 2001 95.9K 2.6K 34
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A very simple way of displaying a print preview in a simple window
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The Doc/View architecture in MFC is not the fastest way to create a simple print preview. This article will explain how to create your own print preview.

MFC Doc/View is designed to make the MSVC programmers get their work done in minutes, including print preview. Sometimes we do not need to use Doc/View framework but we really do need its print-preview power.

The key to Print Preview is in the following functions

  • CreateCompatibleBitmap
  • CreateCompatibleDC
  • GetDeviceCaps
  • GetTextExtent

Beside those four functions Print Preview needs a function that work for scaling and painting on the screen DC.

Luckily we have StretchBlt and BitBlt ready to do the dirty work, but sometimes StretchBlt might need to be replaced by your favourite routine (for dithering, filtering, antialiasing etc.).

The function to perform print preview in a window is as follows.

// pWnd is the window you wish to show the preview
// Design and implementation 13 Jan 2000 15:14
//	Danang Suharno
//	Ngadinegaran MJ 3/156
//	Yogyakarta 55143
//	Indonesia
void PrintPreview(CWnd *pWnd) 
	CString strWords;
	CWnd* pWnd = GetDlgItem(IDC_STATIC_PREVIEW); // This is a rectangle control
	CDC* dc;
	CDC memoriDC;
	CBitmap memBMP;
	CBitmap* pOldBMP;
	CFont fnt;
	CFont* pOldFnt;
	CRect rect;
	CRect rectMemory;
	CSize zMetrix;

	CPrintDialog pdlg(FALSE);
	CDC prnDC;

	di.cbSize = sizeof(DOCINFO);
	di.lpszDocName = "This string will appear in Printer Queue";
	di.lpszOutput = NULL;     
	di.lpszDatatype = NULL;
	di.fwType = 0;

	// Get current printer setting

	dc = pWnd->GetDC();

	// DC printer???
	if( !prnDC.Attach(pdlg.GetPrinterDC()) )
		AfxMessageBox("Invalid Printer DC");

	memoriDC.CreateCompatibleDC(&prnDC); // Create DC for Preview

	// Get the resolution of Screen and Current Default Printer
	int iPrnX = prnDC.GetDeviceCaps(HORZRES);
	int iPrnY = prnDC.GetDeviceCaps(VERTRES);
	int iMonX = dc->GetDeviceCaps(HORZRES); // Device Target is Monitor
	int iMonY = dc->GetDeviceCaps(VERTRES); = 0;
	rectMemory.left = 0;
	rectMemory.bottom = iPrnY;
	rectMemory.right = iPrnX;

	// Create a Memory Bitmap that is compatible with the Printer DC
	// then select or make the bitmap as current GDI active object
	memBMP.CreateCompatibleBitmap(&prnDC, rectMemory.Width(), rectMemory.Height());
	pOldBMP = memoriDC.SelectObject(&memBMP);

	// Clear memory DC or in other words
	// paint the bitmap with white colour and transparent text
	memoriDC.SetTextColor(RGB(0, 0, 0));
	memoriDC.PatBlt(0, 0, rectMemory.Width(), rectMemory.Height(), WHITENESS);

	// Prepare the font
	int iPointz = 100;
	fnt.CreatePointFont(iPointz, "OCR A", &memoriDC);
	strWords.Format("This is line number    ");        // Test string
	pOldFnt = memoriDC.SelectObject(&fnt);
	zMetrix = memoriDC.GetTextExtent(strWords);
	int iPos = 0;

	// Write string or Paint something
	int iMaksimal = 0;
	int iLineHeight = 1;
	int iLoop;
	CString strPuncak;

	// Calculate how many lines we could fit
	for(iLoop = 1; iLoop < 100; iLoop++)
		if( ((*iLoop) < iPrnY ) 

	strPuncak.Format("Maximum Amount of line(s) for %d points are %d lines", 
		iPointz, iMaksimal);
	for(iLoop = 0; iLoop < iMaksimal; iLoop++)
		strWords.Format("This is line %d", iLoop);
		memoriDC.TextOut(0, iLoop*(, strWords);
	// Reseting font

	// Calculate ratio
	float fXRatio = (float) iMonX/iPrnX;
	float fYRatio = (float) iMonY/iPrnY;
	//  iLebar = Width
	//  iTinggi = Height
	//  iXPosisiPreview = horisontal location of preview
	//  iYPosisiPreview = vertical location of preview
	int iLebar = rect.Width()*fXRatio;
	int iTinggi = rect.Height()*fYRatio;
	int iXPosisiPreview = (rect.Width() - iLebar)/2;
	int iYPosisiPreview = (rect.Height() - iTinggi)/2;
	CPen pen(PS_SOLID, 2, RGB(255, 0, 0));
	CPen* pOldPen;

	// Create an outline
	pOldPen = dc->SelectObject(&pen);
	dc->Rectangle(iXPosisiPreview, iYPosisiPreview,iXPosisiPreview + iLebar + 2,
		iYPosisiPreview + iTinggi + 2);

	// Put in the box
	dc->StretchBlt(iXPosisiPreview , iYPosisiPreview, iLebar, iTinggi,
		&memoriDC, 0, 0, rectMemory.Width(), rectMemory.Height(), SRCCOPY);
	// Cleaning Up



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About the Author

Danang Suharno
United States United States
No Biography provided

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Comments and Discussions

GeneralPrinting it Pin
Adeel Mirza3-Feb-10 20:29
memberAdeel Mirza3-Feb-10 20:29 
Generaldoesn't work under Vista SP1 Pin
Beiley10-May-08 9:44
memberBeiley10-May-08 9:44 
General[Message Removed] Pin
nompel4-Oct-08 2:18
membernompel4-Oct-08 2:18 
GeneralRe: doesn't work under Vista SP1 Pin
Member 193415013-May-09 19:16
memberMember 193415013-May-09 19:16 
GeneralRe: doesn't work under Vista SP1 Pin
Beiley14-May-09 6:07
memberBeiley14-May-09 6:07 
The problem turned out to be that StretchBlt() does not support going across devices. So, when you try to stretch between a printer HDC to a screen HDC it doesn't work as of Vista SP1. A solution is to first go to a device independent bitmap (DIB), and then you can use StretchDIBits(). See:

Beiley Software
Generalreading data from file when list control is very first shown Pin
Win32.sality10-Mar-08 22:43
memberWin32.sality10-Mar-08 22:43 
QuestionHow To Print listView items on A4 paper from VC++ Express Edition? Pin
chrisliando14-Nov-07 13:26
memberchrisliando14-Nov-07 13:26 
QuestionGetting Data from IP Camera using VC++ Pin
Kirubanandam6-Jan-06 22:54
memberKirubanandam6-Jan-06 22:54 
Generalimprovement Pin
Franz Brunner8-Jan-03 22:48
memberFranz Brunner8-Jan-03 22:48 
GeneralGetDlgItem does take 1 argument, if ... Pin
Arnt Witteveen13-Apr-00 22:12
sussArnt Witteveen13-Apr-00 22:12 
GeneralGetDlgItem does not take 1 argument Pin
Arnt Witteveen12-Apr-00 5:07
sussArnt Witteveen12-Apr-00 5:07 
GeneralCWnd* pWnd defined twice Pin
Christian10-Feb-00 7:29
sussChristian10-Feb-00 7:29 

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