C / C++ / MFC

template<class T>  
void ptrErase(T * type)
{	
    delete type;
};

template<class T> 
struct ptrErase : public unary_function<T, void>
{
  void operator() (T type) 
  { 
    delete type;
  }
};

DOCINFO         di ;
CPrintInfo      printInfo ;
CRefinementProDoc       *pDoc = GetDocument() ;
CString         filename ;
CDC             dc ;
CRect           draw_area ;

ASSERT_VALID(pDoc) ;
filename = pDoc->GetPathName() ;
// make sure the compares will match
filename.MakeLower() ;
if (filename == "")
    {
    filename = pDoc->GetTitle() ;
    if (filename.Find(" (modified)") >= 0)
        filename = filename.Left(filename.GetLength() - 11) ;
    }
if (filename.Find(".sds") >= 0)
    filename = filename.Left(filename.GetLength() - 4) ;
if (filename.Find(".mds") >= 0)
    filename = filename.Left(filename.GetLength() - 4) ;
filename += ".pdf" ;

CFileDialog     dlg(FALSE, "PDF", filename, OFN_OVERWRITEPROMPT | OFN_HIDEREADONLY, "Adobe acrobat PDF files (*.pdf)|*.pdf||") ;
dlg.m_ofn.lpstrInitialDir = theApp.g_szLastDirectory ;
// sub-class the window to allow ownerdrawn controls
pView = this ;
dlg.SetTemplate("MYFILEOPEN", "MYFILEOPENEXPLORER") ;
dlg.m_ofn.Flags |= OFN_ENABLEHOOK ;
dlg.m_ofn.lpfnHook = (LPOFNHOOKPROC)OFNHookProcOldStyle ;

if (dlg.DoModal() == IDCANCEL)
    return ;
// copy across the selected pages to print
for (int i = 0 ; i < MAX_DLLS ; i++)
    global_page_status[i] = g_bAllowPrint[i] ;
filename = dlg.GetPathName() ;

HDC hDC = theApp.g_PDF.GetPrinterDC() ;
if (hDC == NULL)
    return ;

OnAboutToPrint() ;
di.cbSize = sizeof(DOCINFO) ;
di.lpszDocName = pDoc->GetPathName() ;
di.lpszOutput = filename ;

// prepare the print information structure
dc.Attach(hDC) ;
printInfo.m_bDirect = TRUE ;
printInfo.m_rectDraw.left = 0 ;
printInfo.m_rectDraw.right = dc.GetDeviceCaps(HORZRES) ;
printInfo.m_rectDraw.top = 0 ;
printInfo.m_rectDraw.bottom = dc.GetDeviceCaps(VERTRES) ;
draw_area = printInfo.m_rectDraw ;

dc.StartDoc(&di) ;
OnPreparePrinting(&printInfo) ;

// start printing the document
for (printInfo.m_nCurPage = 1 ; printInfo.m_nCurPage <= printInfo.GetMaxPage() ; printInfo.m_nCurPage++)
    {
    dc.StartPage() ;
    OnPrint(&dc, &printInfo) ;
    dc.EndPage() ;
    // reset page size as OnPrint may have odified them when
    // header / footers were added to the page
    printInfo.m_rectDraw = draw_area ;
    }
OnEndPrinting(&dc, &printInfo) ;
dc.EndDoc() ;
VERIFY(dc.DeleteDC()) ;
// pop-up the pdf viewer
if (theApp.g_bStartPDF)
    ShellExecute(NULL, NULL, filename, NULL, NULL, SW_SHOWMAXIMIZED) ;
theApp.SetLastDirectory(filename.Left(filename.ReverseFind('\\'))) ;

class MyClass : public CWnd
{  
    HWND m_hWnd;

public:
    static LRESULT MyHandler(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam) 
    {
        LRESULT lResult;
        MyClass *ThisPtr = dynamic_cast<MyClass*>(::GetWindowLong(hWnd, GWL_USERDATA));
        if (!ThisPtr)
        {
            //Call defwindow proc, this window has not been initialized for this class.
        }

        switch (nMsg)
        {
            case WM_CREATE:
            {
                 lResult = ThisPtr->OnCreate(nMsg, wParam, lParam);
                 ...
            }
            case ...:
            ...
        }

        return lResult;
    }  

    HWND CreateWindow()  
    {     
        WNDCLASS wc;    
        wc.lpfnWndProc = MyHandler;    
        m_hWnd = CreateWindow(blah);  

        ::SetWindowLong(m_hWnd, GWL_USERDATA, (LONG)this);
        
        return m_hWnd;
    }

    // Handler functions
    LRESULT OnCreate (WPARAM wParam, LPARAM lParam)
    {
         //Handle the WM_CREATE message.
    }
};