Subj : Re: How can I make a very large program run?
To   : borland.public.cpp.borlandcpp
From : "Richard Hufford" <support@thesystem.com>
Date : Mon Feb 09 2004 05:22 pm

  I apologize for this long post.  I can't think of a way to ask this
briefly.
  I thought I'd try asking my question again in a different way.  The
situation may appear different, but I'm sure it's the same problem.  I am
trying to get a DEVMODE structure for the default printer.  I have a
function that gets the device name from the profile, opens the printer, and
gets the size of the DEVMODE structure using the DocumentProperties
function.  Once the size of the DEVMODE structure is known, the
DocumentProperties function is used again to retrieve the DEVMODE structure.
A message box is displayed at the end of the function indicating whether the
function was successful.
  If I put a call to this function in a very small OWL application, the
function is always successful.  I can put the function call in OwlMain,
before the application is run, and it is successful.  In my very large
program, for most computers and printers, the function is successful.
However, if I am using a Windows 2000 machine and a newer HP Laserjet
printer, for example an HP Laserjet 1200 series, the first call to
DocumentProperties returns -1, and GetLastError returns 6, which I believe
is ERROR_INVALID_HANDLE.  The function succeeds on a Windows 2000 machine if
I have an older HP Laserjet, such as a LaserJet III set as the default
printer.  The reason I believe the error is a size limitation is that I can
put the function call in OwlMain, before any other code I've written, and
the error still occurs.
  I thought Windows was basically limitless.  We haven't run into any size
problems since we got away from MS-DOS, until now.  Are there any limits
related to TLINK or TLIB or compiled modules that I need to know about?
  Here's the function that fails on Windows 2000 in large programs:
#include <windows.h>
#include <stdio.h>
#include <string.h>

void CmiPrinterTest() {
 char device[201];
   GetProfileString("windows", "device", ",,,", device, 200);
   char *comma = strchr (device, ',');
   if (comma) *comma = 0;

   DEVMODE *DevMode = NULL;

 HANDLE h;
   if (OpenPrinter (device, &h, NULL)) {
      int DmSize = DocumentProperties(NULL, h, device, NULL, NULL, 0);
      if (DmSize < 0) {
         int e = GetLastError();
         char buf[101];
         sprintf (buf, "error=%d", e);
         ::MessageBox (NULL, buf, "after docprop", MB_OK);
      }
      if (DmSize > 0) {
        DevMode = (DEVMODE *) new char[DmSize];
         DocumentProperties(NULL, h, device, DevMode, NULL, DM_OUT_BUFFER);
      }
      ClosePrinter (h);
   }
   ::MessageBox (NULL, DevMode ? "OK" : "fail", "test", MB_OK);
   if (DevMode) delete DevMode;
}

.