[英]Using ctime to print current system time to millisecond precision?
I have a data acquisition program running in an Ubuntu environment.我有一个在 Ubuntu 环境中运行的数据采集程序。 When a data trigger is met, the program creates a new file containing the data, with the filename being a timestamp of when the trigger was met.当满足数据触发器时,程序会创建一个包含数据的新文件,文件名是满足触发器时的时间戳。 Right now I'm generating a timestamp using ctime and the program works:现在我正在使用 ctime 生成时间戳,并且程序可以工作:
#include <time.h>
time_t rawtime; // Generating time stamp
time(&rawtime);
sprintf(buffer, "/usb/%s.txt", ctime(&rawtime));
A file is created named Fri_May_27_17_58_38_2022.txt
创建了一个名为Fri_May_27_17_58_38_2022.txt
的文件
Is it possible to use the same method to get a more precise timestamp to milliseconds?是否可以使用相同的方法来获得更精确的时间戳到毫秒?
On most platforms you can take the second part of a struct timespec
( tv_sec
) gotten from timespec_get
and use localtime
or gmtime
to break it down into its components, leaving only the nano second part.在大多数平台上,您可以获取从timespec_get
的struct timespec
( tv_sec
) 的第二部分,并使用localtime
或gmtime
将其分解为其组件,只留下纳秒部分。
#include <time.h>
#include <stdio.h>
int main() {
struct timespec ts;
timespec_get(&ts, TIME_UTC);
time_t seconds = ts.tv_sec;
printf("%s", ctime(&seconds)); // just for comparison
struct tm *t = localtime(&seconds);
printf("%04d-%02d-%02dT%02d:%02d:%02d.%09ld\n",
t->tm_year+1900, t->tm_mon+1, t->tm_mday,
t->tm_hour, t->tm_min, t->tm_sec,
ts.tv_nsec
);
}
Possible output:可能的输出:
Fri May 27 18:36:14 2022
2022-05-27T18:36:14.513916611
If you only need milliseconds:如果您只需要毫秒:
printf("%04d-%02d-%02dT%02d:%02d:%02d.%03ld\n",
t->tm_year+1900, t->tm_mon+1, t->tm_mday,
t->tm_hour, t->tm_min, t->tm_sec,
ts.tv_nsec / 1000000
);
Possible output:可能的输出:
Fri May 27 18:36:14 2022
2022-05-27T18:36:14.513
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