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the following program works with c compiler and returns correct date. But on tizen app code it returns 0:
time_t my_time;
struct tm * timeinfo;
time (&my_time);
timeinfo = localtime (&my_time);
int y = timeinfo->tm_year+1900;
int m = timeinfo->tm_mon+1;
int d = timeinfo->tm_mday;
char day[10];
dlog_print(DLOG_DEBUG, "GG", "Current time: %d %d %d", y,m,d);
required screenshot:
it shows 0 only for date(d) but other m and y is printed correctly. Also similar code prints correct date on other c complier program.
How to get current day of the month properly?
You can use Watch Application API on the wearable profile.
You can also find sample code in Tizen Studio sample application(Classic Watch) like as below.
/**
* #brief Called at each second. This callback is not called while the app is paused or the device is in ambient mode.
* #param[in] watch_time The watch time handle. watch_time will not be available after returning this callback. It will be freed by the framework.
* #param[in] user_data The user data to be passed to the callback functions
*/
void app_time_tick(watch_time_h watch_time, void* user_data)
{
int hour = 0;
int min = 0;
int sec = 0;
int year = 0;
int month = 0;
int day = 0;
int day_of_week = 0;
watch_time_get_hour(watch_time, &hour);
watch_time_get_minute(watch_time, &min);
watch_time_get_second(watch_time, &sec);
watch_time_get_day(watch_time, &day);
watch_time_get_month(watch_time, &month);
watch_time_get_year(watch_time, &year);
watch_time_get_day_of_week(watch_time, &day_of_week);
_set_time(hour, min, sec);
_set_date(day, month, day_of_week);
_set_moonphase(day, month, year);
}
#include <stdio.h>
#include <time.h>
int main()
{
time_t now;
struct tm timespace;
double seconds;
struct timespec t = { 2 /*seconds*/, 0 /*nanoseconds*/ };
while (1) {
time(&now);
seconds = now;
printf("%.f Timer Counter\n", seconds);
timespace = *localtime(&now);
nanosleep(&t, NULL);
time(&now);
seconds = now;
fflush(stdout);
printf("%.f Counter Value After two second delay.\n Hellow.\n", seconds);
seconds = now;
printf("\n\n\n");
timespace = *localtime(&now);
nanosleep(&t, NULL);
fflush(stdout);
time(&now);
seconds = now;
printf("%.f Counter Value After two second delay.\n Hello World 2.\n", seconds);
return 0;
}
}
Every time I compile this code it says:
variable `timespec t' has initializer but incomplete type
and
'nanosleep' undeclared (first use this function)
If I wanted a time delay, I will do something like this:
int t = time( NULL );
int delay = 2;
while( time(NULL) < (t + delay) );
std::cout << "...";
It is fairly close to a two seconds time delay.
I've asked something close to this before, but as it seems, the time I get from the file does not convert to the same type of time you get from localtime() and time().
Exactly what I want is:
I have a txt file with the following information
order.txt
file1.txt;5;15:40
file2.txt;7;15:41
file1.txt;10;16:00
My objective is to get the time in hour:min (15:40) and then, if it's the same as the currentTime, then I show the file1.txt content. Otherwise, if the currentTime is lower than the hour:min time (15:40), it waits untill it's 15:40 and shows the file1.txt content. If the currentTime is higher, then it ignores the first one and goes to the next one.
So for example, if the current time is 15:39, it will wait 1 minute and then show the file1.txt content.
If the current Time is 15:40, it shows the file1.txt content without waiting.
If the current Time is 15:41, it just goes to the next one (file2.txt) and checks again.
Used variables
FILE* orderFile;
FILE* contentFile;
FILE* defaultFile; (This will be used when this code works)
char fileName[50];
char textContent[5000];
int seconds;
int hour, min;
int diff_time;
char timeValue[50];
time_t current;
Includes
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
So for that I've tried the following code:
orderFile = fopen("order.txt","r");
defaultFile = fopen("default.txt","r");
while(fscanf(orderFile," %49[^;];%d; %49[^\n]",fileName,&seconds,timeValue)
{
sscanf(timeValue,"%d:%d",&hour,&min);
contentFile = fopen(fileName,"r");
if(contentFile != NULL)
{
fseek (contentFile, 0, SEEK_END);
size = ftell(contentFile);
rewind(contentFile);
if(size == 0)
{
printf("\nEmpty file. (Scanned file: %s)\n", fileName);
fclose(contentFile);
}
else
{
time_t now;
time(&now);
struct tm file_time_tm;
file_time_tm = *localtime(&now);
file_time_tm.tm_hour = hour;
file_time_tm.tm_min = min;
file_time_tm.tm_sec = 0;
file_time_tm.tm_isdst = -1;
time_t fileTime = mktime(&file_time_tm);
double diff_time = difftime(fileTime, now);
if(diff_time == 0)
{
while(fscanf(contentFile,"%[^\t]",textContent) == 1)
{
printf("%s\n", textContent);
}
sleep(seconds);
}
else
{
if(diff_time > 0)
{
while(fscanf(defaultFile,"%[^\t]",defaultContent) == 1)
{
printf("%s\n", defaultContent);
}
sleep(diff_time);
while(fscanf(contentFile,"%[^\t]",textContent) == 1)
{
printf("%s\n", textContent);
}
sleep(seconds);
}
}
fclose(defaultFile);
fclose(contentFile);
}
}
else
{
if(contentFile == NULL)
{
printf("\nFile does not exist. (Scanned file: %s)\n", fileName);
fclose(contentFile);
}
}
}
fclose(orderFile);
printf("\n");
So thanks to chux it is quite working now, yet not fully working.
If I have the following:
Current Time: 15:00
order.txt
file1.txt;5;15:01
file2.txt;6;15:02
file3.txt;3;15:03
When I run the program, the following will occur:
DEFAULT MESSAGE (text inside default.txt)
WAITS DIFF_TIME (CORRECTLY DONE)
SHOWS CONTENT FROM THE file1.txt
WAITS 5 SECONDS
X - SHOWS CONTENT FROM THE file2.txt (This is wrong, it should check again and if the time is 15:02 it will show, not 15:01. Which I assume it's because it is still reading as 15:01 on the timeValue and not 15:02, any idea why?)
WAITS UNTILL IT'S 15:02 (wrong)
SHOWS file3.txt (wrong)
WAITS UNTILL IT'S 15:03
ENDS (wrong as it should not end after waiting, it should end when file3.txt shows and waits for 3 seconds)
Output I need:
DEFAULT MESSAGE
waits diff_time
file1.txt content
waits 5 seconds
DEFAULT MESSAGE
waits diff_time
file2.txt content
waits 7 seconds
DEFAULT MESSAGE
waits diff_time
file3.txt content
waits 3 seconds
ENDS
It also does not work well if I have two files with the same time, such as this:
order.txt
file1.txt;5;15:01
file2.txt;6;15:01
file3.txt;3;15:02
It breaks it aswell.
Any idea of how to do this correctly?
As commented above by #M Oehm, it is apparent the compiler warnings are not fully enabled. Suggest enabling them - it will save you time.
A problem lies in the time compare and subtraction.
// Troublesome code
if(currentTime->tm_hour < hour && currentTime->tm_min < min) {
diff_time = difftime(currentTime,timeValue);
printf("%d - Or this?\n", diff_time);
sleep(diff_time);
}
The comparison is curious. Usually with such a comparison would be in the form
if (h1 < h2 || (h1 == h2 && m1 < m2))
difftime takes 2 time_t paramters, not char timeValue[50] and a struct tm.
The values passed to double difftime(time_t time1, time_t time0) appear backwards. The result it time1 - time0.
Recommend instead
int current_hm = currentTime->tm_hour * 60 + currentTime->tm_min;
int file_hm = hour * 60 + min;
if (current_hm < file_hm) {
unsigned diff_time = (file_hm - current_hm)*60u;
printf("%u - Or this?\n", diff_time);
sleep(diff_time);
}
[Edit]
Simplified approach.
time_t now;
time(&now);
struct tm file_time_tm;
file_time_tm = *localtime(&now);
file_time_tm.tm_hour = hour; // from file
file_time_tm.tm_min = min; // from file
file_time_tm.tm_sec = 0;
file_time_tm.tm_isdst = -1;
time_t filetime = mktime(&file_time_tm);
double diff = difftime(filetime, now); // filetime - now
if (diff > 0) {
sleep((unsigned) diff);
}
Chux's suggestion to do your comparisons with your own integer that represents the minutes after midnight is probably easier in your case, but if you want to use the standard time mechanisms, you can do it.
But first, keep in mind that there are two time representations, time_t, which is a "numerical" time that stores the seconds after the epoch and struct tm, which is the human-readable time that breaks a time down to years, months, days and so on.
With strptime, you can scan a string accoding to a format specification. It is the scanf for struct tm. This function does not initialise fields that are not specified, so that you can assign the current time with localtime and then overwrite only the hour and minute fields.
mktime converts a struct tm to a time_t, which you can pass to difftime.
The following code snipped shows how such a comparison might work:
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
int main()
{
char stamp[] = "12:53";
char *p;
struct tm now;
time_t t = time(NULL);
now = *localtime(&t);
p = strptime(stamp, "%H:%M", &now);
if (p == NULL || *p != '\0') {
printf("Illegal date.\n");
} else {
char buf[20];
double dsec;
int dmin;
strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M\n", &now);
puts(buf);
dsec = difftime(t, mktime(&now));
printf("Diff: %g sec\n", dsec);
dmin = (int) dsec / 60;
printf("Diff: %d min\n", dmin);
}
return 0;
}
I have a struct array (Training data[10]) that contains some data that I want to pass to functions.
int convertTime(Time time)
{
minutes = time.seconds * 60;
// Takes data from data[0].time.seconds and converts them to minutes.
// My only problem is that I am being asked send a struct to this function, but I have to send the array because that's where all my data is stored
return minutes;
}
typedef struct
{
int seconds;
} Time;
typedef struct
{
Time time;
double distance;
} Training;
Training data[10];
Training input;
scanf("%d %lf", input.time.seconds, input.distance);
data[0].time.seconds = input.time.seconds;
data[0].distance = input.distance;
So now data[0].time.seconds and data[0].distance contains all data I need. I just have to pass data[0].time.seconds to the function, but in my assignment I am prompted to send the struct Time to the function, and I don't understand that since Time is only storing temporary data? It's the stored data that I want to send to the function.
How do I convert seconds to hours, minutes and seconds?
time.hours = seconds / 3600;
time.minutes = (seconds - time.hours * 3600) / 60;
time.seconds = seconds - 3600 * time.hours - 60 * time.minutes;
This seems to be right in my eyes but it fails. hours is correctly calculated but not minutes and sconds :(
To pass the structure, name it in the call:
some_function(data[0].time); // By value
other_function(&data[0].time); // By address
Both functions get passed the Time value contained in the data[0] element of your array of Training structures.
Suppose you have a value which is the number of seconds since midnight. And suppose you define another structure with hours/minutes/seconds, you can set this clock structure as follows,
typedef struct
{
int hours;
int minutes;
int seconds;
} Clock;
You can print this structure, either to a char buffer, or to stdout,
char*
clockPrint(Clock* timep,char *stringbuf)
{
if(stringbuf)
sprintf(stringbuf,"%02d:%02d:%02d",(timep)->seconds,(timep)->minutes,(timep)->seconds);
else
printf("%02d:%02d:%02d",(timep)->seconds,(timep)->minutes,(timep)->seconds);
return stringbuf;
}
Extracting hours, minutes, and seconds from an epoch time or a number of seconds since midnight can be done,
int //return days...
TimeSet(Clock* timep, int epoch)
{
(timep)->seconds = (epoch) % 60;
(timep)->minutes = (epoch/60) % 60;
(timep)->hours = (epoch/60/60) % 24;
int days;
return days = (epoch/60/60/24);
}
Should you want to obtain hours, minutes, or seconds from this clock value,
void
TimeGet(Clock* timep, int* hoursp, int* minutesp, int* secondsp)
{
if(hoursp) *hoursp = (timep)->hours;
if(minutesp) *minutesp = (timep)->minutes;
if(secondsp) *secondsp = (timep)->seconds;
return;
}
Since you have stored a Time in your Date struct, which contains a number of seconds (presumably since midnight), and you have an array of some number of these Date's defined,
Training data[10];
Training input;
You can use scanf to read your seconds and distance values. And as stated, you can then place your input into your data[0] element,
//scanf wants pointers to int and float data
float distance;
printf("enter: seconds distance "); fflush(stdout);
scanf("%d %lf", &(input.time.seconds), &distance);
//you can then store the distance into your input struct double
input.distance = distance;
data[0].time.seconds = input.time.seconds;
data[0].distance = input.distance;
You could also use gettimeofday(3) or clock_gettime(2) to grab the current time (seconds since epoch),
struct timeval tv;
gettimeofday(&tv,NULL); //posix.1-2001 function, seconds
input.time.seconds = tv.tv_sec;
//or
struct timespec ts;
clock_gettime(CLOCK_REALTIME,&ts); //posix.1-2008 function, seconds
input.time.seconds = ts.tv_sec;
Then you can separate your seconds into hours, minutes, and seconds,
Clock clk;
int hours, minutes, seconds;
TimeSet(&clk, data[0].time.seconds);
TimeGet(&clk, &hours, &minutes, &seconds);
Or you can format a string for printing, or print to stdout,
char clockbuffer[30];
clockPrint(&clk,NULL);
printf("time (HH:MM:SS): %s\n", clockPrint(&clk,clockbuffer));
i need some advice and help with a plugin i am writing for Nagios.
i am writing the plugin in C, but have no previous experience in the language except for minor amounts whilst trying to get this plugin to work.
basically what i am trying to-do is the following.
read a text file that is generated on a remote PC by an application i have written, this program writes nothing more than 5 characters into the file, the first 4 chars are the time in 24 hour format. e.g. 22:30 > 10:30pm
it then needs to take these 4 characters convert them into a time and compare it to the current system time (if there is a difference of 5 mins then it generates a reply to nagios to flag a warning).
I have tried many different ways of doing this, my first attempt was to convert the characters into an integer, then convert the time into an integer and compare the difference .. failed at doing this.
my second attempt is to generate two Time Structs one with the current time in and the other with my "homemade" time in and compare them but this is not working either.
heres my code, no matter what i try the date from the file is always the same as the current system time, i know its something to-do with having to set the time at the top.
t_of_file = time(NULL);
time_from_file = localtime(&t_of_file);
but if i do not do this i get a segmentation fault.
heres the code.
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define COPYMODE 0644
int main(int argc, char *argv[])
{
struct tm *time_from_file;
struct tm *the_system_time;
time_t t_of_file;
time_t t_of_sys;
t_of_sys = time(NULL);
the_system_time = localtime(&t_of_sys);
t_of_file = time(NULL);
time_from_file = localtime(&t_of_file);
time_from_file->tm_year = the_system_time->tm_year;
time_from_file->tm_mon = the_system_time->tm_mon;
time_from_file->tm_mday = the_system_time->tm_mday;
time_from_file->tm_hour = 10; //should be read in from file
time_from_file->tm_min = 30; //should be read in from file
time_from_file->tm_sec = the_system_time->tm_sec;
time_from_file->tm_isdst = the_system_time->tm_isdst;
t_of_file = mktime(time_from_file);
printf("%s\n",ctime(&t_of_file));
t_of_sys = mktime(the_system_time);
printf("%s\n",ctime(&t_of_sys));
double difference = difftime(t_of_file, t_of_sys );
printf("%lf\n",(double)t_of_file);
printf("%lf\n",(double)t_of_sys);
if (difference >= 0.0) { //this should be 5 mins, not quite sure what to put here yet
// second is later than first
printf("later\n");
}
else if (difference < 0.0) {
// second is earlier than first
printf("earlier\n");
}
printf("%lf\n", difference);
return 0;//STATE_OK;
}
any help you can offer would be appreciated on this.
Following the answers i got, PACE's answer was spot on for what i wanted to-do and now i have a simpler bit of code that works perfectly for what i am trying to-do and is easier to under stand. below is the code in its modified form (it compiles perfectly on Linux btw).
#include <stdio.h>
#include <time.h>
int main ()
{
time_t filetime;
time_t presenttime;
struct tm * timeinfo;
time ( &filetime );
time ( &presenttime);
timeinfo = localtime ( &filetime );
timeinfo->tm_hour = 14; //this should be entered from file
timeinfo->tm_min = 15; //this should be entered from file
filetime = mktime ( timeinfo );
printf("my time %s\n",ctime(&filetime));
printf("pc time %s\n",ctime(&presenttime));
double difference = difftime(filetime, presenttime );
printf("%lf\n",(double)filetime);
printf("%lf\n",(double)presenttime);
if (difference > 300.0) {
// second is later than first
printf("later\n");
}
else if (difference < 0.0) {
// second is earlier than first
printf("earlier\n");
}
printf("%lf\n", difference);
return 0;
cheers for the help guys.
There is an example of making a time here. You can then compare the times with the difftime method.
If it were me, I'd be tempted to just save the result of time() to the file. That would save a whole lot of string parsing work on the other side.
I modified your code as follows and it does now what you were expecting:
struct tm time_from_file;
struct tm the_system_time;
time_t t_of_file;
time_t t_of_sys;
t_of_sys = time(NULL);
memcpy(&the_system_time,localtime(&t_of_sys),sizeof(struct tm));
t_of_file = time(NULL);
memcpy(&time_from_file,localtime(&t_of_sys),sizeof(struct tm));
time_from_file.tm_hour = 10; //should be read in from file
time_from_file.tm_min = 30; //should be read in from file
t_of_file = mktime(&time_from_file);
printf("%s\n",ctime(&t_of_file));
printf("%s\n",ctime(&t_of_sys));
double difference = difftime(t_of_file, t_of_sys );
printf("%lf\n",(double)t_of_file);
printf("%lf\n",(double)t_of_sys);
printf("%lf\n", difference);
What was wrong with your code:
You were using and modifying the pointer returned by localtime which happens to be same in both cases.
Consequently your pointers time_from_file and the_system_time were infact pointing to the same location.Any modification of one modifies the other as well and finally you have a difference of zero.
(Thanks gdb for helping me figure out that!!:D)
Paring your format is easy in C. Use this to read the time components from the file:
int hr, min;
fscanf (file, "%d:%d", &hr, &min);
Here is a complete solution:
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
struct HrMin_ {
int hr;
int min;
};
typedef struct HrMin_ HrMin;
static const double TIME_DIFFERENCE = (double) (5 * 1000);
static HrMin read_time (FILE* file);
int
main (int argc, char **argv)
{
time_t sys_time_t = 0;
struct tm *sys_time = NULL;
struct tm *file_time = NULL;
double d = 0.0f;
if (argc != 2)
{
printf ("Usage: time_cmp <time_file>\n");
return 1;
}
time (&sys_time_t);
sys_time = localtime (&sys_time_t);
file_time = malloc (sizeof (struct tm));
file_time->tm_sec = sys_time->tm_sec;
file_time->tm_min = sys_time->tm_min;
file_time->tm_hour = sys_time->tm_hour;
file_time->tm_mday = sys_time->tm_mday;
file_time->tm_mon = sys_time->tm_mon;
file_time->tm_year = sys_time->tm_year;
file_time->tm_wday = sys_time->tm_wday;
file_time->tm_yday = sys_time->tm_yday;
file_time->tm_isdst = sys_time->tm_isdst;
FILE *file = fopen (argv[1], "r");
if (file == NULL)
{
printf ("Failed to open file: %s\n", argv[1]);
return 1;
}
HrMin hr_min = read_time (file);
fclose (file);
file_time->tm_hour = hr_min.hr;
file_time->tm_min = hr_min.min;
d = difftime (sys_time_t, mktime (file_time));
free (file_time);
if (d < 0) d *= -1;
printf ("Diff: %f\n", d);
if (d >= TIME_DIFFERENCE)
printf ("WARN!\n");
return 0;
}
static HrMin
read_time (FILE *file)
{
HrMin hr_min;
hr_min.hr = 0;
hr_min.min = 0;
fscanf (file, "%d:%d", &hr_min.hr, &hr_min.min);
return hr_min;
}