/*-----------------------------------------
DIGCLOCK.C -- Digital Clock Program
(c) Charles Petzold, 1996
-----------------------------------------*/
#include <windows.h>
#include <time.h>
#define ID_TIMER 1
#define YEAR (datetime->tm_year % 100)
#define MONTH (datetime->tm_mon + 1)
#define MDAY (datetime->tm_mday)
#define WDAY (datetime->tm_wday)
#define HOUR (datetime->tm_hour)
#define MIN (datetime->tm_min)
#define SEC (datetime->tm_sec)
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
void SizeTheWindow (int *, int *, int *, int *) ;
char sDate[2], sTime[2], sAMPM[2][5] ;
int iDate, iTime ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static char szAppName[] = "DigClock" ;
HWND hwnd ;
MSG msg ;
int xStart, yStart, xClient, yClient ;
WNDCLASSEX wndclass ;
wndclass.cbSize = sizeof (wndclass) ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = NULL ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = NULL ;
wndclass.lpszClassName = szAppName ;
wndclass.hIconSm = NULL ;
RegisterClassEx (&wndclass) ;
SizeTheWindow (&xStart, &yStart, &xClient, &yClient) ;
hwnd = CreateWindow (szAppName, szAppName,
WS_POPUP | WS_DLGFRAME | WS_SYSMENU,
xStart, yStart,
xClient, yClient,
NULL, NULL, hInstance, NULL) ;
if (!SetTimer (hwnd, ID_TIMER, 1000, NULL))
{
MessageBox (hwnd, "Too many clocks or timers!", szAppName,
MB_ICONEXCLAMATION | MB_OK) ;
return FALSE ;
}
ShowWindow (hwnd, SW_SHOWNOACTIVATE) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
void SizeTheWindow (int *pxStart, int *pyStart,
int *pxClient, int *pyClient)
{
HDC hdc ;
TEXTMETRIC tm ;
hdc = CreateIC ("DISPLAY", NULL, NULL, NULL) ;
GetTextMetrics (hdc, &tm) ;
DeleteDC (hdc) ;
*pxClient = 2 * GetSystemMetrics (SM_CXDLGFRAME) + 16*tm.tmAveCharWidth ;
*pxStart = GetSystemMetrics (SM_CXSCREEN) - *pxClient ;
*pyClient = 2 * GetSystemMetrics (SM_CYDLGFRAME) + 2*tm.tmHeight ;
*pyStart = 0 ;
}
void SetInternational (void)
{
static char cName [] = "intl" ;
iDate = GetProfileInt (cName, "iDate", 0) ;
iTime = GetProfileInt (cName, "iTime", 0) ;
GetProfileString (cName, "sDate", "/", sDate, 2) ;
GetProfileString (cName, "sTime", ":", sTime, 2) ;
GetProfileString (cName, "s1159", "AM", sAMPM[0], 5) ;
GetProfileString (cName, "s2359", "PM", sAMPM[1], 5) ;
}
void WndPaint (HWND hwnd, HDC hdc)
{
static char szWday[] = "Sun\0Mon\0Tue\0Wed\0Thu\0Fri\0Sat" ;
char cBuffer[40] ;
int iLength ;
RECT rect ;
struct tm *datetime ;
time_t lTime ;
time (&lTime) ;
datetime = localtime (&lTime) ;
iLength = wsprintf (cBuffer, " %s %d%s%02d%s%02d \r\n",
(PSTR) szWday + 4 * WDAY,
iDate == 1 ? MDAY : iDate == 2 ? YEAR : MONTH, (PSTR) sDate,
iDate == 1 ? MONTH : iDate == 2 ? MONTH : MDAY, (PSTR) sDate,
iDate == 1 ? YEAR : iDate == 2 ? MDAY : YEAR) ;
if (iTime == 1)
iLength += wsprintf (cBuffer + iLength, " %02d%s%02d%s%02d ",
HOUR, (PSTR) sTime, MIN, (PSTR) sTime, SEC) ;
else
iLength += wsprintf (cBuffer + iLength, " %d%s%02d%s%02d %s ",
(HOUR % 12) ? (HOUR % 12) : 12,
(PSTR) sTime, MIN, (PSTR) sTime, SEC,
(PSTR) sAMPM [HOUR / 12]) ;
GetClientRect (hwnd, &rect) ;
DrawText (hdc, cBuffer, -1, &rect, DT_CENTER | DT_NOCLIP) ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
HDC hdc ;
PAINTSTRUCT ps ;
switch (iMsg)
{
case WM_CREATE :
SetInternational () ;
return 0 ;
case WM_TIMER :
InvalidateRect (hwnd, NULL, FALSE) ;
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;
WndPaint (hwnd, hdc) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_WININICHANGE :
SetInternational () ;
InvalidateRect (hwnd, NULL, TRUE) ;
return 0 ;
case WM_DESTROY :
KillTimer (hwnd, ID_TIMER) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
}
