RE: Would somebody be kind enough to provide a working timestamp code?
- From: "Matt" <Matt@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 1 Jul 2005 10:31:02 -0700
I'm not one to give free code away, because that's not how you learn. I will,
however, give you some advice.
That error is saying that you have no WinMain() function in your code.
Judging by your post, I think you're trying to make a console application,
anyway, and not a windows application, in which case you should have started
the wizard by making a Win32 Console Application. That's problem number 1.
Secondly, you have no main() function in your code, which is the starting
point for your application. Basically, that's what the linker's complaining
about, except that the Win32 application (not Win32 Console) always starts
with WinMain instead of main().
Fix that and you should be fine - there are no compiler errors in your code.
Good luck,
-- Matt
"John Smith" wrote:
> I'm not a professional programmer but do have a need to print date
> and time to screen. Would somebody be kind enough to provide a
> working non-MFC code just to print date and time to screen
> (command window) using cout or printf?
>
> I have searched the Net and found some examples in C but they
> don't work on vc++. I also found the following code, supposedly
> for windows. But during compiling, I got the following error message:
>
> Compiling...
> times.c
> Linking...
> LIBCD.lib(wwincrt0.obj) : error LNK2001: unresolved external
> symbol _wWinMain@16
> Debug/times.exe : fatal error LNK1120: 1 unresolved externals
> Error executing link.exe.
>
> ================== here is the code ====================
> /***************************************************************
> time.c
>
> author : uema2
> date : Nov 30, 2002
>
> You can freely use, copy, modify, and redistribute
> the whole contents.
> ***************************************************************/
>
> /*#define __SCRATCH_TIMEC_DEBUG__ */
>
> #include <windows.h>
> #include <tchar.h>
> #include <time.h>
>
> /* globals */
> const __int64 _onesec_in100ns = (__int64)10000000;
> int timezone, _timezone, altzone;
> int daylight;
> char *tzname[2];
>
>
> /* __int64 <--> FILETIME */
> static __int64 wce_FILETIME2int64(FILETIME f)
> {
> __int64 t;
>
> t = f.dwHighDateTime;
> t <<= 32;
> t |= f.dwLowDateTime;
> return t;
> }
>
> static FILETIME wce_int642FILETIME(__int64 t)
> {
> FILETIME f;
>
> f.dwHighDateTime = (DWORD)((t >> 32) & 0x00000000FFFFFFFF);
> f.dwLowDateTime = (DWORD)( t & 0x00000000FFFFFFFF);
> return f;
> }
>
> /* FILETIME utility */
> static FILETIME wce_getFILETIMEFromYear(WORD year)
> {
> SYSTEMTIME s={0};
> FILETIME f;
>
> s.wYear = year;
> s.wMonth = 1;
> s.wDayOfWeek = 1;
> s.wDay = 1;
>
> SystemTimeToFileTime( &s, &f );
> return f;
> }
>
> static time_t wce_getYdayFromSYSTEMTIME(const SYSTEMTIME* s)
> {
> __int64 t;
> FILETIME f1, f2;
>
> f1 = wce_getFILETIMEFromYear( s->wYear );
> SystemTimeToFileTime( s, &f2 );
>
> t = wce_FILETIME2int64(f2)-wce_FILETIME2int64(f1);
>
> return (time_t)((t/_onesec_in100ns)/(60*60*24));
> }
>
> /* tm <--> SYSTEMTIME */
> static SYSTEMTIME wce_tm2SYSTEMTIME(struct tm *t)
> {
> SYSTEMTIME s;
>
> s.wYear = t->tm_year + 1900;
> s.wMonth = t->tm_mon + 1;
> s.wDayOfWeek = t->tm_wday;
> s.wDay = t->tm_mday;
> s.wHour = t->tm_hour;
> s.wMinute = t->tm_min;
> s.wSecond = t->tm_sec;
> s.wMilliseconds = 0;
>
> return s;
> }
>
> static struct tm wce_SYSTEMTIME2tm(SYSTEMTIME *s)
> {
> struct tm t;
>
> t.tm_year = s->wYear - 1900;
> t.tm_mon = s->wMonth- 1;
> t.tm_wday = s->wDayOfWeek;
> t.tm_mday = s->wDay;
> t.tm_yday = wce_getYdayFromSYSTEMTIME(s);
> t.tm_hour = s->wHour;
> t.tm_min = s->wMinute;
> t.tm_sec = s->wSecond;
> t.tm_isdst = 0;
>
> return t;
> }
>
> /* FILETIME <--> time_t */
> time_t wce_FILETIME2time_t(const FILETIME* f)
> {
> FILETIME f1601, f1970;
> __int64 t, offset;
>
> f1601 = wce_getFILETIMEFromYear(1601);
> f1970 = wce_getFILETIMEFromYear(1970);
>
> offset = wce_FILETIME2int64(f1970) - wce_FILETIME2int64(f1601);
>
> t = wce_FILETIME2int64(*f);
>
> t -= offset;
> return (time_t)(t / _onesec_in100ns);
> }
>
> FILETIME wce_time_t2FILETIME(const time_t t)
> {
> FILETIME f, f1970;
> __int64 time;
>
> f1970 = wce_getFILETIMEFromYear(1970);
>
> time = t;
> time *= _onesec_in100ns;
> time += wce_FILETIME2int64(f1970);
>
> f = wce_int642FILETIME(time);
>
> return f;
> }
>
> /* time.h difinition */
> time_t time( time_t *timer )
> {
> SYSTEMTIME s;
> FILETIME f;
>
> if( timer==NULL ) return 0;
>
> GetSystemTime( &s );
>
> SystemTimeToFileTime( &s, &f );
>
> *timer = wce_FILETIME2time_t(&f);
> return *timer;
> }
>
> struct tm *localtime( const time_t *timer )
> {
> SYSTEMTIME ss, ls, s;
> FILETIME sf, lf, f;
> __int64 t, diff;
> static struct tm tms;
>
> GetSystemTime(&ss);
> GetLocalTime(&ls);
>
> SystemTimeToFileTime( &ss, &sf );
> SystemTimeToFileTime( &ls, &lf );
>
> diff = wce_FILETIME2int64(sf) - wce_FILETIME2int64(lf);
>
> f = wce_time_t2FILETIME(*timer);
> t = wce_FILETIME2int64(f) - diff;
> f = wce_int642FILETIME(t);
>
> FileTimeToSystemTime( &f, &s );
>
> tms = wce_SYSTEMTIME2tm(&s);
>
> return &tms;
> }
>
> time_t mktime(struct tm* pt)
> {
> SYSTEMTIME ss, ls, s;
> FILETIME sf, lf, f;
> __int64 diff;
>
> GetSystemTime(&ss);
> GetLocalTime(&ls);
> SystemTimeToFileTime( &ss, &sf );
> SystemTimeToFileTime( &ls, &lf );
>
> diff =
> (wce_FILETIME2int64(lf)-wce_FILETIME2int64(sf))/_onesec_in100ns;
>
> s = wce_tm2SYSTEMTIME(pt);
> SystemTimeToFileTime( &s, &f );
> return wce_FILETIME2time_t(&f) - (time_t)diff;
> }
>
> struct tm *gmtime(const time_t *t)
> {
> FILETIME f;
> SYSTEMTIME s;
> static struct tm tms;
>
> f = wce_time_t2FILETIME(*t);
> FileTimeToSystemTime(&f, &s);
> tms = wce_SYSTEMTIME2tm(&s);
> return &tms;
> }
>
> char* ctime( const time_t *t )
> {
> // Wed Jan 02 02:03:55 1980\n\0
> static char buf[30]={0};
> char week[] = "Sun Mon Tue Wed Thr Fri Sat ";
> char month[]= "Jan Feb Mar Apl May Jun Jul Aug Sep Oct Nov Dec ";
> struct tm tms;
>
> tms = *localtime(t);
>
> strncpy( buf, week+tms.tm_wday*4, 4 );
> strncpy( buf+4, month+tms.tm_mon*4, 4 );
> sprintf( buf+8, "%02d ", tms.tm_mday );
> sprintf( buf+11, "%02d:%02d:%02d %d\n",
> tms.tm_hour, tms.tm_min, tms.tm_sec, tms.tm_year+1900 );
> return buf;
> }
>
> char *asctime(const struct tm *pt)
> {
> static char buf[30]={0};
> char week[] = "Sun Mon Tue Wed Thr Fri Sat ";
> char month[]= "Jan Feb Mar Apl May Jun Jul Aug Sep Oct Nov Dec ";
>
> strncpy( buf, week+pt->tm_wday*4, 4 );
> strncpy( buf+4, month+pt->tm_mon*4, 4 );
> sprintf( buf+8, "%02d ", pt->tm_mday );
> sprintf( buf+11, "%02d:%02d:%02d %d\n",
> pt->tm_hour, pt->tm_min, pt->tm_sec, pt->tm_year+1900 );
> return buf;
> }
>
> void tzset()
> {
> daylight = 1;
> _timezone = 28800;
> timezone = 28800;
> }
>
> int clock(void)
> {
> return 1;
> }
>
.
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