vc ＋＋中获取系统小时时间

2025-03-05 01:34:54

推荐回答（1个）

回答（1）：

1 使用time_t time( time_t * timer ) 精确到秒　　计算时间差使用double difftime( time_t timer1, time_t timer0 )2 使用clock_t clock() 得到的是CPU时间精确到1/CLOCKS_PER_SEC秒3 使用DWORD GetTickCount() 得到的是系统运行的时间精确到毫秒4 如果使用MFC的CTime类，可以用CTime::GetCurrentTime() 精确到秒5 要获取高精度时间，可以使用 BOOL QueryPerformanceFrequency(LARGE_INTEGER *lpFrequency)获取系统的计数器的频率 BOOL QueryPerformanceCounter(LARGE_INTEGER *lpPerformanceCount)获取计数器的值然后用两次计数器的差除以Frequency就得到时间。 GetTickCount()和GetCurrentTime()都只精确到55ms(1个tick就是55ms)。如果要精确到毫秒，应该使用timeGetTime函数或QueryPerformanceCounter函数。具体例子可以参考QA001022 "VC++中使用高精度定时器"、QA001813 "如何在Windows实现准确的定时"和QA004842 "timeGetTime函数延时不准"。Q:vc++怎样获取系统时间，返回值是什么类型的变量呢？ GetSystemTime返回的是格林威志标准时间 GetLocalTime，和上面用法一样，返回的是你所在地区的时间，中国返回的是北京时间 VOID GetSystemTime( LPSYSTEMTIME lpSystemTime // address of system time structure ); 函数就可以获得了，其中LPSYSTEMTIME 是个结构体含：年，月，日，周几，小时，分，秒，毫秒。以下是Time的MSDN文档:Compatibility in the Introduction.Libraries Return Valuetime returns the time in elapsed seconds. There is no error return.ParametertimerStorage location for timeRemarksThe time function returns the number of seconds elapsed since midnight (00:00:00), January 1, 1970, coordinated universal time, according to the system clock. The return value is stored in the location given by timer. This parameter may be NULL, in which case the return value is not stored. Example/* TIMES.C illustrates various time and date functions including: * time _ftime ctime asctime * localtime gmtime mktime _tzset * _strtime _strdate strftime * * Also the global variable: * _tzname */#include #include #include #include #include void main(){ char tmpbuf[128], ampm[] = "AM"; time_t ltime; struct _timeb tstruct; struct tm *today, *gmt, xmas = { 0, 0, 12, 25, 11, 93 }; /* Set time zone from TZ environment variable. If TZ is not set, * the operating system is queried to obtain the default value * for the variable. */ _tzset(); /* Display operating system-style date and time. */ _strtime( tmpbuf ); printf( "OS time:\t\t\t\t%s\n", tmpbuf ); _strdate( tmpbuf ); printf( "OS date:\t\t\t\t%s\n", tmpbuf ); /* Get UNIX-style time and display as number and string. */ time( <ime ); printf( "Time in seconds since UTC 1/1/70:\t%ld\n", ltime ); printf( "UNIX time and date:\t\t\t%s", ctime( <ime ) ); /* Display UTC. */ gmt = gmtime( <ime ); printf( "Coordinated universal time:\t\t%s", asctime( gmt ) ); /* Convert to time structure and adjust for PM if necessary. */ today = localtime( <ime ); if( today->tm_hour > 12 ) { strcpy( ampm, "PM" ); today->tm_hour -= 12; } if( today->tm_hour == 0 ) /* Adjust if midnight hour. */ today->tm_hour = 12; /* Note how pointer addition is used to skip the first 11 * characters and printf is used to trim off terminating * characters. */ printf( "12-hour time:\t\t\t\t%.8s %s\n", asctime( today ) + 11, ampm ); /* Print additional time information. */ _ftime( &tstruct ); printf( "Plus milliseconds:\t\t\t%u\n", tstruct.millitm ); printf( "Zone difference in seconds from UTC:\t%u\n", tstruct.timezone ); printf( "Time zone name:\t\t\t\t%s\n", _tzname[0] ); printf( "Daylight savings:\t\t\t%s\n", tstruct.dstflag ? "YES" : "NO" ); /* Make time for noon on Christmas, 1993. */ if( mktime( &xmas ) != (time_t)-1 ) printf( "Christmas\t\t\t\t%s\n", asctime( &xmas ) ); /* Use time structure to build a customized time string. */ today = localtime( <ime ); /* Use strftime to build a customized time string. */ strftime( tmpbuf, 128, "Today is %A, day %d of %B in the year %Y.\n", today ); printf( tmpbuf );} OutputOS time: 21:51:03OS date: 05/03/94Time in seconds since UTC 1/1/70: 768027063UNIX time and date: Tue May 03 21:51:03 1994Coordinated universal time: Wed May 04 04:51:03 199412-hour time: 09:51:03 PMPlus milliseconds: 279Zone difference in seconds from UTC: 480Time zone name: Daylight savings: YESChristmas Sat Dec 25 12:00:00 1993Today is Tuesday, day 03 of May in the year 1994.

最新问答

求等差数列和等比数列前几项和的公式？

如何表达注意身体健康的句子(50句)

北京少儿街舞培训班哪家好一些？儿子想学跳舞。

话题作文素材

我是初中学历想学习会计，应该选择培训班、夜校还是函授?以我现在的学历自考专科在家学习要多长时间？

有没有傅雷家书的每章概括啊！！

耕地占用税的征税范围是什么？

方差分析中的SS,DF.MS.F等都表示什么

ᓹ拿快递时可以拆开验货，如果是手机的话可以开机验货吗

跪求下载献给爱妻的歌BD1280高清中英双字种子的网址跪谢