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Microsoft OS/2 SDK PM 02-24-1989

/*-----------------------------
   DIGCLOCK.C -- Digital Clock 
  -----------------------------*/

#define INCL_WIN
#define INCL_GPI
#define INCL_DOS
#include <os2.h>
#include <stdio.h>

#define ID_TIMER 1

MRESULT EXPENTRY ClientWndProc (HWND, USHORT, MPARAM, MPARAM) ;
VOID    SizeTheWindow (HWND) ;

int main (void)
     {
     static CHAR  szClientClass[] = "DigClock" ;
     static ULONG flFrameFlags = FCF_TITLEBAR | FCF_SYSMENU  |
                                 FCF_BORDER   | FCF_TASKLIST ;
     HAB          hab ;
     HMQ          hmq ;
     HWND         hwndFrame, hwndClient ;
     QMSG         qmsg ;

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

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

     hwndFrame = WinCreateStdWindow (HWND_DESKTOP, WS_VISIBLE,
                                     &flFrameFlags, szClientClass, NULL,
				     0L, NULL, 0, &hwndClient) ;
     SizeTheWindow (hwndFrame) ;

     if (WinStartTimer (hab, hwndClient, ID_TIMER, 1000))
          {
          while (WinGetMsg (hab, &qmsg, NULL, 0, 0))
               WinDispatchMsg (hab, &qmsg) ;

          WinStopTimer (hab, hwndClient, ID_TIMER) ;
          }
     else
          WinMessageBox (HWND_DESKTOP, hwndClient,
                         "Too many clocks or timers",
                         szClientClass, 0, MB_OK | MB_ICONEXCLAMATION) ;

     WinDestroyWindow (hwndFrame) ;
     WinDestroyMsgQueue (hmq) ;
     WinTerminate (hab) ;
     return 0 ;
     }

VOID SizeTheWindow (HWND hwndFrame)
     {
     FONTMETRICS fm ;
     HPS         hps ;
     RECTL       rcl ;

     hps = WinGetPS (hwndFrame) ;
     GpiQueryFontMetrics (hps, (LONG) sizeof fm, &fm) ;
     WinReleasePS (hps) ;

     rcl.yBottom = 0 ;
     rcl.yTop    = 11 * fm.lMaxBaselineExt / 4 ;
     rcl.xRight  = WinQuerySysValue (HWND_DESKTOP, SV_CXSCREEN) ;
     rcl.xLeft   = rcl.xRight - 16 * fm.lEmInc ;

     WinCalcFrameRect (hwndFrame, &rcl, FALSE) ;

     WinSetWindowPos (hwndFrame, NULL, (SHORT) rcl.xLeft, (SHORT) rcl.yBottom,
                      (SHORT) (rcl.xRight - rcl.xLeft),
                      (SHORT) (rcl.yTop - rcl.yBottom), SWP_SIZE | SWP_MOVE) ;
     }

VOID UpdateTime (HWND hwnd, HPS hps)
     {
     static BOOL        fHaveCtryInfo = FALSE ;
     static CHAR        *szDayName [] = { "Sun", "Mon", "Tue", "Wed",
                                          "Thu", "Fri", "Sat" } ;
     static CHAR        szDateFormat [] = " %s  %d%s%02d%s%02d " ;
     static COUNTRYCODE ctryc = { 0, 0 } ;
     static COUNTRYINFO ctryi ;
     CHAR               szBuffer [20] ;
     DATETIME           dt ;
     RECTL              rcl ;
     USHORT             usDataLength ;

               /*----------------------------------------
                  Get Country Information, Date and Time
                 ----------------------------------------*/

     if (!fHaveCtryInfo)
          {
          DosGetCtryInfo (sizeof ctryi, &ctryc, &ctryi, &usDataLength) ;
          fHaveCtryInfo = TRUE ;
          }
     DosGetDateTime (&dt) ;
     dt.year %= 100 ;

               /*------------- 
                  Format Date
                 -------------*/
                                   /*-----------------
                                      mm/dd/yy format
                                     -----------------*/
     if (ctryi.fsDateFmt == 0)

          sprintf (szBuffer, szDateFormat, szDayName [dt.weekday],
                             dt.month, ctryi.szDateSeparator,
                             dt.day,   ctryi.szDateSeparator, dt.year) ;

                                   /*-----------------
                                      dd/mm/yy format
                                     -----------------*/
     else if (ctryi.fsDateFmt == 1)

          sprintf (szBuffer, szDateFormat, szDayName [dt.weekday],
                             dt.day,   ctryi.szDateSeparator,
                             dt.month, ctryi.szDateSeparator, dt.year) ;

                                   /*-----------------
                                      yy/mm/dd format
                                     -----------------*/
     else
          sprintf (szBuffer, szDateFormat, szDayName [dt.weekday],
                             dt.year,  ctryi.szDateSeparator,
                             dt.month, ctryi.szDateSeparator, dt.day) ;

               /*-------------- 
                  Display Date
                 --------------*/

     WinQueryWindowRect (hwnd, &rcl) ;
     rcl.yBottom += 5 * rcl.yTop / 11 ;
     WinDrawText (hps, -1, szBuffer, &rcl, CLR_NEUTRAL, CLR_BACKGROUND,
                  DT_CENTER | DT_VCENTER) ;

               /*------------- 
                  Format Time
                 -------------*/
                                   /*----------------
                                      12-hour format
                                     ----------------*/
     if ((ctryi.fsTimeFmt & 1) == 0)

          sprintf (szBuffer, " %d%s%02d%s%02d %cm ",
                             (dt.hours + 11) % 12 + 1, ctryi.szTimeSeparator,
                             dt.minutes, ctryi.szTimeSeparator,
                             dt.seconds, dt.hours / 12 ? 'p' : 'a') ;

                                   /*----------------
                                      24-hour format
                                     ----------------*/
     else
          sprintf (szBuffer, " %02d%s%02d%s%02d ",
                             dt.hours,   ctryi.szTimeSeparator,
                             dt.minutes, ctryi.szTimeSeparator, dt.seconds) ;

               /*-------------- 
                  Display Time
                 --------------*/

     WinQueryWindowRect (hwnd, &rcl) ;
     rcl.yTop -= 5 * rcl.yTop / 11 ;
     WinDrawText (hps, -1, szBuffer, &rcl, CLR_NEUTRAL, CLR_BACKGROUND,
                  DT_CENTER | DT_VCENTER) ;
     }

MRESULT EXPENTRY ClientWndProc (HWND hwnd, USHORT msg, MPARAM mp1, MPARAM mp2)
     {
     HPS  hps;

     switch (msg)
          {
          case WM_TIMER:
               hps = WinGetPS (hwnd) ;
               GpiSetBackMix (hps, BM_OVERPAINT) ;

               UpdateTime (hwnd, hps) ;

               WinReleasePS (hps) ;
               return 0 ;

          case WM_PAINT:
               hps = WinBeginPaint (hwnd, NULL, NULL) ;
               GpiErase (hps) ;

               UpdateTime (hwnd, hps) ;

               WinEndPaint (hps) ;
               return 0 ;
          }
     return WinDefWindowProc (hwnd, msg, mp1, mp2) ;
     }

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