C / C++ / MFC

// this code is taken from Vadim Z.'s article RTF based Tooltips
// www.codeguru.com
//----------------------------------------------------------------------------
// Function CMyRichEditCtrl::Print
// @func    print the rich edit control content
// @parm    bool  | bShowPrintDialog | show the dialog box CPrintDialog
//----------------------------------------------------------------------------
// @todo 
//----------------------------------------------------------------------------
void CSpscRichEditCtrl::Print(bool bShowPrintDialog, CWnd* pParent /*=NULL*/)
{
  CPrintDialog printDialog(false, PD_ALLPAGES | PD_USEDEVMODECOPIES | PD_NOPAGENUMS
      | PD_HIDEPRINTTOFILE | PD_NOSELECTION, pParent);

  if (bShowPrintDialog)
  {
    int r = printDialog.DoModal();
    if (r == IDCANCEL)
      return; // User pressed cancel, don't print.
  }
  else
  {
    printDialog.GetDefaults();
  }

  HDC hPrinterDC = printDialog.GetPrinterDC();

  // This code basically taken from MS KB article Q129860 

  FORMATRANGE fr;
  int    nHorizRes = GetDeviceCaps(hPrinterDC, HORZRES);
  int    nVertRes = GetDeviceCaps(hPrinterDC, VERTRES);
  int     nLogPixelsX = GetDeviceCaps(hPrinterDC, LOGPIXELSX);
  int     nLogPixelsY = GetDeviceCaps(hPrinterDC, LOGPIXELSY);
  LONG        lTextLength;   // Length of document.
  LONG        lTextPrinted;  // Amount of document printed.

  // Ensure the printer DC is in MM_TEXT mode.
  SetMapMode ( hPrinterDC, MM_TEXT );

  // Tell the control to release cached information.
  FormatRange(NULL,false);      

  // Rendering to the same DC we are measuring.
  ZeroMemory(&fr, sizeof(fr));
  fr.hdc = fr.hdcTarget = hPrinterDC;

  // Set up the page.
  fr.rcPage.left     = fr.rcPage.top = 0;
  fr.rcPage.right    = (nHorizRes/nLogPixelsX) * 1440;
  fr.rcPage.bottom   = (nVertRes/nLogPixelsY) * 1440;

  // Set up 0" margins all around.
  fr.rc.left   = fr.rcPage.left ;//+ 1440;  // 1440 TWIPS = 1 inch.
  fr.rc.top    = fr.rcPage.top ;//+ 1440;
  fr.rc.right  = fr.rcPage.right ;//- 1440;
  fr.rc.bottom = fr.rcPage.bottom ;//- 1440;

  // Default the range of text to print as the entire document.
  fr.chrg.cpMin = 0;
  fr.chrg.cpMax = -1;
  // Set up the print job (standard printing stuff here).
  DOCINFO di;
  ZeroMemory(&di, sizeof(di));
  di.cbSize = sizeof(DOCINFO);

  di.lpszDocName = _T("eClinic Pharmacy SMS Authorisation Form");

  // Do not print to file.
  di.lpszOutput = NULL;


  // Start the document.
  StartDoc(hPrinterDC, &di);

  // Find out real size of document in characters.
  //lTextLength = GetTextLength();
  lTextLength = GetTextLengthEx(GTL_PRECISE | GTL_NUMCHARS);

  do
  {
    // Start the page.
    StartPage(hPrinterDC);

    // Print as much text as can fit on a page. The return value is
    // the index of the first character on the next page. Using TRUE
    // for the wParam parameter causes the text to be printed.

    lTextPrinted =FormatRange(&fr,true);
    DisplayBand(&fr.rc );

    // Print last page.
    EndPage(hPrinterDC);

    // If there is more text to print, adjust the range of characters
    // to start printing at the first character of the next page.
    if (lTextPrinted < lTextLength)
    {
      fr.chrg.cpMin = lTextPrinted;
      fr.chrg.cpMax = -1;
    }
  }
  while (lTextPrinted < lTextLength);

  // Tell the control to release cached information.
  FormatRange(NULL,false);


  EndDoc (hPrinterDC);

  ///////

  DeleteDC(hPrinterDC);

}

GetTextLength()

lTextLength = GetTextLengthEx(GTL_PRECISE | GTL_NUMCHARS);

Smart Arab wrote:

I also try to edit , winuser.h , From

Smart Arab wrote:

conversion from 'INT_PTR' to 'int', possible loss of data.

CPallini wrote:

You should work on this, I suppose. Which line is giving you this message?

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
    hInst = hInstance;
	return DialogBox(hInstance, MAKEINTRESOURCE(DLG_MAIN), NULL, DialogProc);
}

return static_cast<int>(DialogProc());

INT_PTR nRet = DialogProc();
return nRet != ID_OK ? 1 : 0;

Smart Arab wrote:

DialogProc function Return INT_PTR while the WinMain which return the DialogProc "must return int."

Smart Arab wrote:

I think I must find a way to convert from IntPtr to int safely ..

// in WinMain
return DialogBox(hInstance, MAKEINTRESOURCE(DLG_MAIN), NULL, (DLGPROC)DialogProc);

1. Assign the DialogBox return value to an (INT_PTR) variable (say result).
2. Based on result value, return an appropriate (int) number from the WinMain function.

pix_programmer wrote:

I've to select a number radomly from 1 t0 6. What is the C++ code for this?

int number;

// initialize random seed (best call it very early in the programm)
srand ( time(NULL) );

// generate number
number = rand() % 6 + 1;

int n = 1 + 6.0 * rand() / (RAND_MAX + 1.0);

CPallini wrote:

Notice though that this modulo operation does not generate a truly uniformly distributed random number in the span (since in most cases lower numbers are slightly more likely), but it is generally a good approximation for short spans.

CPallini wrote:

How did you perform the test?