CODEWITHSUNDEEP
c++c++11ctime
atsCoder
atsCoder

Reputation: 13

c++11 get current time with microsecond precision

I know how to get current time with microsecond precision under linux using gettimeofday(). However it's not portable and does not work on MinGW. How to get the same functionality with C++11?

#include <sys/time.h>
#include <cstdio>

int main(){
    timeval curTime;
    gettimeofday(&curTime, NULL);

    unsigned long micro = curTime.tv_usec;
    printf("micro is: %lu\n", micro);

    char buffer [30];
    //localtime is not thread safe
    strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", localtime((const time_t*)&curTime.tv_sec));
    printf("buffer is: %s\n", buffer);

    char currentTime2[30] = "";
    sprintf(currentTime2, "%s.%06Lu", buffer, micro); 
    printf("currenttime is: %s\n", currentTime2);
}

it's fine in Linux and does not print buffer under MinGW. What is wrong here?

Upvotes: 1

Views: 2072

Answers (2)

wblades
wblades

Reputation: 64

Have you tried std::chrono::high_resolution_clock ? You might find this article a useful reference for the inner working of C++ 11 chrono library.

Upvotes: 2

Yakk - Adam Nevraumont
Yakk - Adam Nevraumont

Reputation: 275896

std::chrono::high_resolution_clock. It is portable, but may suck. Duration cast into high precision: you can even ask how precise it claims to be, but that may not be trustworthy.

boost has clock and time libraries that are portable, and may be more reliable.

Upvotes: 2

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