Generic printing class (and how to print a list control content)

A Generic Printer class – and how to print a list control content
(or how to print from anywhere without too many troubles).

The CPrinterJob class is a base class for implementing print process aside from the
view architecture; it comes along with a CPrintStatus (a CDialog derived) which
shows the printing progress process. You will need to derive a class from this
and override the virtual functions as you need; the function are exactly the same
as the CView ones (OnPreparePrinting, OnBeginPrinting, OnPrint and so on ..) and
you can threat them in the same way; then you can call the OnFilePrint function that
will start the printing process. If you want to call a “Page Setup” dialog for
customizing the printing you can do this in the OnPreparePrinting function and
eventually return false to break the process.

As an example, I’ve written a class to print the content of a CListCtrl (CListCtrlPrint)
with a CListPrintSetup class to manage header, footer, fonts types and sizes and margins.

The CListPrintSetup uses three things that can be used for other purposes:

  1. A CCoolButton class, which is an ownerdraw button with a cool look (main code borrowed
    from another codeguru .. 🙂

  2. A CFontCombo class, which is a combobox for choosing a font; borrowed from
    Girish Bharadwaj code with only a small modify to avoid symbols font

  3. Some macros (you will find them in the CListPrintSetup header file) to manage tab pages.
    I use here this way for tab sheet: I write the main dialog which contains the tab control
    and the button which are common (ex. Ok, Cancel), and then the tab pages as child
    dialogs without borders and title; then with the macros you can easily connect
    them to the tab control.

The CPrinterJob class

This class is designed to be a base class for your evil pourpose; it works exactly
as a CView (except for printing preview, sorry!).
It has some virtual functions you can override as you would normally do inside a
CView class:

virtual bool OnPreparePrinting(CPrintInfo* pInfo, bool bPrintPreview = false);

– the only difference from the CView’s one is the bPrintPreview members – I use it
for my pourpose, if you aren’t using it from inside a CView you can safely ignore it.
You should call the base class function from this one (ex. return CPrinterJob::OnPreparePrinting(pInfo, bPrintPreview));

virtual void OnBeginPrinting(CDC* pDC, CPrintInfo* pInfo);
virtual void OnPrint(CDC* pDC, CPrintInfo* pInfo);
virtual void OnEndPrinting(CDC* pDC, CPrintInfo* pInfo);

– those three functions work exactly as the CView ones and do nothing in the base class
is up to your derived one to do something (almost in the OnPrint – or you will print white pages ..)

Supposing you have properly derived your class and do something in the OnPrint()

(ex. CMyPJob::OnPrint(CDC* pDC, CPrintInfo* pInfo) { pDC->TextOut(100,100,”Hello World!”); })

all you need to do the printing process is this:

CMyPJob pJob;
pJob.OnFilePrint();

To include this class in your project you will need to do this:

  • add the CPrinterJob class
  • add the CPrintStatus class (is a dialog, add it with its resoruce)
  • add the avi files you will use in the CPrintStatus class (in this sample, it is
    borrowed from Windows – it’s called IDR_PRINT and it’s an “AVI” resource

    To see a working implementation of the above, look below to the CListCtrlPrint class.

    The CListCtrlPrint class

    This is a class derived from the CPrinterJob. It permits to print the content of a
    CListCtrl; it also implements a option dialog for setting the header and footer and
    the fonts type and size.

    The use of this class is very simple, as you can see in the sample application: in the
    OnOK() function of the sample dialog, we find:

    	CListCtrlPrint cJob;
    	cJob.csPageHead = "This is the header of the filernMultiline!rn";
    	cJob.csPageFooter = "Just a test for the footersrneventually multiline too ..";
    	cJob.csPage = "Page %d of %d";
    	cJob.pList = &wndList;
    	cJob.OnFilePrint();
    

    If it meets your needs, all you need is to include the following things in your project:

    • the classes for CPrinterJob as stated above;
    • classes CCoolButton and CFontCombo for controls
      (CCoolbutton needs the cursor resource IDC_HANDCUR)

    • classes CListPrintPage1, CListPrintPage2 and CListPrintSetup for the option dialog
      (you’ll need the dialogs resources and the bitmap resource IDB_PAGE)

    • and finally, the CListCtrlPrint which implements the CPrinterJob derived class and
      actually do all the work.

    You can peer through the CListCtrlPrint code to see how to implement a CPrinterJob
    derived.

    Download source 94K.

  • More by Author

    Must Read