date issue

Applications Programming
1

hi all:

I want to create a new file dynamically for each day.how can i do this.

 eg..
      struct tm tm;
      while\(1\)
      \{
          if\(tm.tm_hr==0 && tm.tm_min=0 && tm.tm_sec==0\)
              \{
                  //create a new file..
                  printf\("%d%d%d",tm.tm_hr,....\);
               \}
           else
              \{
                  //continue writing to the old file.
              \}
     \}

but when i try to print the time inside the while(),the min,sec does not change accordingly..why?(i mean it should print the system time dynamically).

2

Can you show where you are calling the localtime() function to populate the tm struct? I think that your code should also be having:

tm=localtime(time());

somewhere, before you check that if condition.

3

yes, i have used localtime function in my code. this function is used right above the if condition inside the while loop. Even then time is not changing dynamically.

4

try this,

# include <time.h>
# include <stdio.h>

int main()
{

time_t  logtime;
 struct tm *now = NULL;

while (1)
{
time(&logtime);
 now=localtime(&logtime);
 fprintf(stderr, "HR: %d MIN: %d SEC: %d\n", now->tm_hour, now->tm_min, now->tm_sec);
 sleep(5);
 }
 return 0;
 }