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Microsoft OS/2 SDK PM 02-24-1989

/*--------------------------------------------------------------
   BIGJOB3.C -- Peek Message approach to lengthy processing job
 ---------------------------------------------------------------*/

#define INCL_WIN
#include <os2.h>
#include "bigjob.h"

HAB  hab ;

int main (void)
     {
     static CHAR  szClientClass [] = "BigJob3" ;
     static ULONG flFrameFlags = FCF_TITLEBAR      | FCF_SYSMENU  |
                                 FCF_SIZEBORDER    | FCF_MINMAX   |
                                 FCF_SHELLPOSITION | FCF_TASKLIST |
                                 FCF_MENU ;
     HMQ          hmq ;
     HWND         hwndFrame, hwndClient ;
     QMSG         qmsg ;

     hab = WinInitialize (0) ;
     hmq = WinCreateMsgQueue (hab, 0) ;

     WinRegisterClass (hab, szClientClass, ClientWndProc, CS_SIZEREDRAW, 0) ;

     hwndFrame = WinCreateStdWindow (HWND_DESKTOP, WS_VISIBLE,
                                     &flFrameFlags, szClientClass,
                                     " - Message Peeking",
                                     0L, NULL, ID_RESOURCE, &hwndClient) ;

     WinSendMsg (hwndFrame, WM_SETICON,
                 WinQuerySysPointer (HWND_DESKTOP, SPTR_APPICON, FALSE),
                 NULL) ;

     while (WinGetMsg (hab, &qmsg, NULL, 0, 0))
          WinDispatchMsg (hab, &qmsg) ;

     WinDestroyWindow (hwndFrame) ;
     WinDestroyMsgQueue (hmq) ;
     WinTerminate (hab) ;
     return 0 ;
     }
	
MRESULT EXPENTRY ClientWndProc (HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
     {
     static BOOL   fContinueCalc = FALSE ;
     static LONG   lCalcRep, lRepAmts [] = { 10, 100, 1000, 10000, 100000 } ;
     static SHORT  sStatus = STATUS_READY ;
     static SHORT  sCurrentRep = IDM_10 ;
     static ULONG  ulElapsedTime ;
     double        A ;
     LONG          lRep ;
     QMSG          qmsg ;

     switch (msg)
          {
          case WM_COMMAND:
               switch (COMMANDMSG(&msg)->cmd)
                    {
                    case IDM_10:
                    case IDM_100:
                    case IDM_1000:
                    case IDM_10000:
                    case IDM_100000:
                         CheckMenuItem (hwnd, sCurrentRep, FALSE) ;
                         sCurrentRep = COMMANDMSG(&msg)->cmd ;
                         CheckMenuItem (hwnd, sCurrentRep, TRUE) ;
                         return 0 ;

                    case IDM_START:
                         EnableMenuItem (hwnd, IDM_START, FALSE) ;
                         EnableMenuItem (hwnd, IDM_ABORT, TRUE) ;

                         sStatus = STATUS_WORKING ;
                         WinInvalidateRect (hwnd, NULL, FALSE) ;

                         lCalcRep = lRepAmts [sCurrentRep - IDM_10] ;
                         fContinueCalc = TRUE ;
                         ulElapsedTime = WinGetCurrentTime (hab) ;

                         qmsg.msg = WM_NULL ;

                         for (A = 1.0, lRep = 0 ; lRep < lCalcRep ; lRep++)
                              {
                              A = Savage (A) ;

                              while (WinPeekMsg (hab, &qmsg, NULL, 0, 0,
                                                 PM_NOREMOVE))
                                   {
                                   if (qmsg.msg == WM_QUIT)
                                        break ;

                                   WinGetMsg (hab, &qmsg, NULL, 0, 0) ;
                                   WinDispatchMsg (hab, &qmsg) ;

                                   if (!fContinueCalc)
                                        break ;
                                   }
                              if (!fContinueCalc || qmsg.msg == WM_QUIT)
                                   break ;
                              }
                         ulElapsedTime = WinGetCurrentTime (hab) - 
                                                  ulElapsedTime ;

                         if (!fContinueCalc || qmsg.msg == WM_QUIT)
                              sStatus = STATUS_READY ;
                         else
                              sStatus = STATUS_DONE ;

                         WinInvalidateRect (hwnd, NULL, FALSE) ;

                         EnableMenuItem (hwnd, IDM_START, TRUE) ;
                         EnableMenuItem (hwnd, IDM_ABORT, FALSE) ;
                         return 0 ;

                    case IDM_ABORT:
                         fContinueCalc = FALSE ;
                         return 0 ;
                    }
               break ;

          case WM_PAINT:
               PaintWindow (hwnd, sStatus, lCalcRep, ulElapsedTime) ;
               return 0 ;
          }
     return WinDefWindowProc (hwnd, msg, mp1, mp2) ;
     }

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