C ++中的系统时间 [英] System time in C++
问题描述
大家好：
我需要添加一个使用ANSI标准访问系统时间（至少至少
毫秒）的片段。 C ++。出于各种原因，我现在无法在我的程序中使用MFC和Win32 API。在ANSI C ++中是否有类似这样的东西？b $ b允许访问最多毫秒。我知道time.h
和CTime允许访问第二级，但我需要工作在$ m $ b msec级别。
任何帮助将不胜感激。
Partho
[见 http://www.gotw.ca/resources/clcm.htm 有关的信息]
[comp.lang.c ++。审核。第一次海报：做到这一点！ ]
Hi all:
I need to add a snippet which access the system time (upto atleast
milliseconds) using ANSI std. C++. I cannot use MFC and Win32 APIs in
my program for now for various reasons. Is there something like this
in ANSI C++ which allows access up to milliseconds. I know that time.h
and CTime allow access up to the second level, but I need to work in
the msec level.
Any help will be appreciated.
Partho
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]
推荐答案
Partho Choudhury写道：
Partho Choudhury wrote:
大家好：
我需要添加一个使用ANSI标准访问系统时间（最多至少几毫秒）的片段。 C ++。由于各种原因，我暂时无法在我的程序中使用MFC和Win32 API。在ANSI C ++中是否有类似这样的内容，允许访问最多毫秒。我知道time.h
和CTime允许访问第二级，但我需要在msec级别工作。
Hi all:
I need to add a snippet which access the system time (upto atleast
milliseconds) using ANSI std. C++. I cannot use MFC and Win32 APIs in
my program for now for various reasons. Is there something like this
in ANSI C++ which allows access up to milliseconds. I know that time.h
and CTime allow access up to the second level, but I need to work in
the msec level.
在time.h中应该有这样的东西：
/ *这定义了CLOCKS_PER_SEC，这是处理器时钟的数量
每秒滴答。 * /
#include< bits / time.h>
/ *这是相同常量的过时POSIX.1-1988名称。 * /
＃if！defined __STRICT_ANSI__&& ！定义__USE_XOPEN2K
＃ifndef CLK_TCK
#define CLK_TCK CLOCKS_PER_SEC
＃endif
＃endif
with clock（）你可以从开始就得到时钟滴答。举个例子
（来源：cplusplus.com）：
/ *时钟示例：倒计时* /
#include< stdio.h> ;
#include< time.h>
无效等待（int秒）
{
clock_t endwait;
endwait = clock（）+ seconds * CLK_TCK; //或CLOCKS_PER_SEC
while（clock（）< endwait）{}
}
int main（）
{
int n;
printf（" Starting countdown ... \ n"）;
for （n = 10; n> 0; n--）
{
printf（"％d \ n"，n）;
等待（1）;
}
printf（" FIRE !!! \ n"）;
返回0; < br $>
}
问候marbac
Hi,
In time.h there should be something like this:
/* This defines CLOCKS_PER_SEC, which is the number of processor clock
ticks per second. */
# include <bits/time.h>
/* This is the obsolete POSIX.1-1988 name for the same constant. */
# if !defined __STRICT_ANSI__ && !defined __USE_XOPEN2K
# ifndef CLK_TCK
# define CLK_TCK CLOCKS_PER_SEC
# endif
# endif
with clock () you can get the clock ticks since start. As an example
(source:cplusplus.com):
/* clock example: countdown */
#include <stdio.h>
#include <time.h>
void wait ( int seconds )
{
clock_t endwait;
endwait = clock () + seconds * CLK_TCK ; // or CLOCKS_PER_SEC
while (clock() < endwait) {}
}
int main ()
{
int n;
printf ("Starting countdown...\n");
for (n=10; n>0; n--)
{
printf ("%d\n",n);
wait (1);
}
printf ("FIRE!!!\n");
return 0;
}
Regards marbac
Partho Choudhury写道：
Partho Choudhury wrote:
I需要添加一个使用ANSI标准访问系统时间（最多至少几毫秒）的片段。 C ++。由于各种原因，我暂时无法在我的程序中使用MFC和Win32 API。在ANSI C ++中是否有类似这样的内容，允许访问最多毫秒。我知道time.h
和CTime允许访问第二级，但我需要在msec级别工作。
I need to add a snippet which access the system time (upto atleast
milliseconds) using ANSI std. C++. I cannot use MFC and Win32 APIs in
my program for now for various reasons. Is there something like this
in ANSI C++ which allows access up to milliseconds. I know that time.h
and CTime allow access up to the second level, but I need to work in
the msec level.
所以，你的问题基本上是这样的：我知道这种语言没有b $ b有一种做A的机制，但在语言中是否有办法做A？
BTW，没有标准符号''CTime''。也许你在混淆C ++
与MFC（由于各种原因你无法使用）。
在我之后重复：没有标准的C ++方式访问系统时间
，除非使用< ctime>中的函数（或< time.h>）。如果你需要
a毫秒分辨率（或更好），你_have_使用特定于OS的
机制（如果有的话）。
V
So, your question is essentially this: I know that the language doesn''t
have a mechanism to do A, but is there a way in the language to do A?
BTW, there is no standard symbol ''CTime''. Perhaps you''re confusing C++
with MFC (which you cannot use for various reasons).
Repeat after me: there is no standard C++ way to access system time
except by using the functions in <ctime> (or <time.h>). If you need
a millisecond resolution (or better), you _have_ to use OS-specific
mechanisms if they are available.
V
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Partho，
您可以尝试使用boost :: osix_time :: ptime接口。它非常简单。
http://www.boost.org/libs/date_time/...dex.html#usage
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[comp.lang.c ++。审核。第一次海报：做到这一点！ ]
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Partho,
You could try using the boost::osix_time::ptime interface. it is quite
simple.
http://www.boost.org/libs/date_time/...dex.html#usage
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uzE86LIai4MH49d6+rdyhgs=
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