格式化一个时间字符串

格式化一个时间字符串 Article last modified on 2002-4-30----------------------------------------------------------------The information in this article applies to:  - Microsoft Visual C++ 6.0---------------------------------------------------------------- 

利用Run-Time Library

具体的用法范例[/b]：[/b]string strTime;CurrentTimeStr(&strTime, TRUE); CurrentTimeStr定义为：[/b][/b]#include  ////////////////////////////////////////////////////////////////////////// STL的常用头文件和声明:  ////////////////////////////////////////////////////////////////////////#pragma warning(disable:4786)#include using namespace std;////////////////////////////////////////////////////////////////////////   //// 构造出当前时间的字符串//void CurrentTimeStr(string *pstrTimeString,                                   BOOL   bWantMore){       char szTimeString[128];       memset(szTimeString, 0, 128);   使用的结构[/i]tm[/i]的说明[/i]:[/i]在[/i]WCHAR.H[/i]中定义[/i]:[/i]#ifndef _TM_DEFINED[/i]struct tm {[/i]        int tm_sec;     /* seconds after the minute - [0,59] */[/i]        int tm_min;     /* minutes after the hour - [0,59] */[/i]        int tm_hour;    /* hours since [/i]midnight[/i] - [0,23] */[/i]        int tm_mday;    /* day of the month - [1,31] */[/i]        int tm_mon;     /* months since January - [0,11] */[/i]        int tm_year;    /* years since 1900 */[/i]        int tm_wday;    /* days since Sunday - [0,6] */[/i]        int tm_yday;    /* days since January 1 - [0,365] */[/i]        int tm_isdst;   /* daylight savings time flag */[/i]        };[/i]#define _TM_DEFINED[/i]#endif[/i]       struct tm *today; time_t[/i]类型是在[/i]WCHAR.H[/i]中定义[/i]:[/i]#ifndef _TIME_T_DEFINED[/i]typedef long time_t;[/i]#define _TIME_T_DEFINED[/i]#endif[/i][/i]       time_t ltime;               定义在[/i]Time.H[/i]中[/i][/i]Set time zone from TZ environment variable. If TZ is not set,[/i]     the operating system is queried to obtain the default value [/i]     for the variable. [/i][/i]    _tzset();         定义在[/i]Time.H[/i]中[/i][/i]Get UNIX-style time and display as number and string.[/i] [/i]    time( <ime ); 这个函数的定义是：[/i][/i]struct tm * __cdecl localtime(const time_t *);[/i]它主要是用来[/i]Use time structure to build a customized time string[/i] and correct for the local time zone[/i]. [/i]它将返回一个指针，指向[/i]tm[/i]的结构，如果这个时间值是早于[/i]1970[/i]年[/i]1[/i]月[/i]1[/i]日午夜的，则会返回[/i]NULL[/i]。[/i][/i]    today = localtime( <ime );        strftime[/i]指定的第一个参数就是目标字符串，第二个参数就是该目标字符串的最大[/i][/i]长度；[/i][/i]第三个参数将制定格式化的定义；[/i][/i]第四个参数是时间结构[/i]tm[/i]下面说明格式化命令的含义：[/i][/i]%m[/i] [/i]Month as decimal number (01 – 12) [/i]%d[/i] [/i]Day of month as decimal number (01 – 31)[/i]%H[/i] [/i]Hour in 24-hour format (00 – 23) [/i]%M[/i] [/i]Minute as decimal number (00 – 59) [/i]%S[/i] [/i]Second as decimal number (00 – 59) [/i]       strftime( szTimeString, 128,                      "=时间: %m月%d日%H时%M分%S秒 ", today );              (*pstrTimeString).append(szTimeString);}//

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