This message was edited by laha at 2006-2-3 4:1:36

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Hi
I have this function, I built 2 days ago, yesrterday it was working perfectly, today not.

char *month(int months, const char *format, char *text, size_t size)
{
   time_t t;
   if ( time ( &t ) != (time_t)(-1) )
   {
      struct tm *local = localtime ( &t );
      if ( local )
      {
         local->tm_mon += months;
         t = mktime ( local );
         if ( t != (time_t)(-1) )
         {
            local = localtime ( &t );
            if ( local )
            {
               if ( strftime ( text, size, format, local ) )
               {
                  return text;
               }
            }
         }
      }
   }
   return 0;
}

I use this function to bring the file of this month, like where are in month 2, so it suppose to bring me the file of month2 daily_report_02.txt , yesterday it brought it to me but today it suppose to bring the same file as we are still in month 2, but it brought me daily_report_03.txt, WWWWWWWWWHyyyyy

notice
one final this because I read a input file of the previous day, so the out put should be put in the same month, what I mean is if today is 1 feb so my code will read the input file of the 31/1/2006 and will put its out put in Jan (Summary_Report_01.txt).


I use this function and call it in main

( notes field contain the path)
    string outpath= field + month(-1, "Daily_Report_%d.txt", outfile, sizeof outfile) ;
ofstream outfile(outpath.c_str(), ios::out | ios::app);

please fix my error

This message was edited by stober at 2006-2-3 4:1:50

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There certainly is a lot easier way to format that string than what you have done.

 char *month(int months, const char *format, char *text, size_t size)
 {
    time_t t = time(0);
    struct tm* tm = localtime(&t);
    // month is 0 based where Jan = 0, so if you want Jan = 1
    // then you have to add 1, not subtract it as you are
    // trying to do in your code.
    sprintf(text,"Daily_Report_%d.txt",tm->tm_mon+1);
    return text;
}

thank you so muc h Stober for your help, but on final think is

one final this because I read a input file of the previous day, so the out put should be put in the same month, what I mean is if today is 1 feb so my code will read the input file of the 31/1/2006 and will put its out put in Jan (Summary_Report_01.txt).

I think this will be affect by this notice.
can you help me with it please.

: This message was edited by stober at 2006-2-3 4:1:50

---

: There certainly is a lot easier way to format that string than what you have done.
:

:  char *month(int months, const char *format, char *text, size_t size)
:  {
:     time_t t = time(0);
:     struct tm* tm = localtime(&t);
:     // month is 0 based where Jan = 0, so if you want Jan = 1
:     // then you have to add 1, not subtract it as you are
:     // trying to do in your code.
:     sprintf(text,"Daily_Report_%d.txt",tm->tm_mon+1);
:     return text;
: }
: 

:
:
:
:
:

If you want yesterday, then subtract one from the day-of-month and call mktime() to normalize the date. If you use Microsoft compilers, the timezone settings will also affect the dates.

char *month(int months, const char *format, char *text, size_t size)
 {
    time_t t = time(0);
    struct tm* tm = localtime(&t);
    tm->tm_mday--; // yesterday
    mktime(tm);
    // month is 0 based where Jan = 0, so if you want Jan = 1
    // then you have to add 1, not subtract it as you are
    // trying to do in your code.
    sprintf(text,"Daily_Report_%d.txt",tm->tm_mon+1);
    return text;
}

Thank you Stober
it seems I did not get the whole idea.

I did a program that read bring yesterday date file and do some calculation and then put the result in an output file ( the problem is only with the out put file) I am asking

consider today 1/02/2006 I have my program will bring day_31.txt acoording to (31/01/2006) and do the some calculation, I wonder if the function you post it to me will be able to recognise that it still needs to put the out put in Summary_Report_01.txt even though we are in a new month. But when the date 2/2/2006 my own code will bring the input file day_01.txt and put the out put in a new month Daily _Report_02.txt.

the problem only with the output file.

sorry for keep asking, because I can not test it till I reach the end of the month. to see it it will recognise it.



: If you want yesterday, then subtract one from the day-of-month and call mktime() to normalize the date. If you use Microsoft compilers, the timezone settings will also affect the dates.
:

: char *month(int months, const char *format, char *text, size_t size)
:  {
:     time_t t = time(0);
:     struct tm* tm = localtime(&t);
:     tm->tm_mday--; // yesterday
:     mktime(tm);
:     // month is 0 based where Jan = 0, so if you want Jan = 1
:     // then you have to add 1, not subtract it as you are
:     // trying to do in your code.
:     sprintf(text,"Daily_Report_%d.txt",tm->tm_mon+1);
:     return text;
: }
: 

:

:
: sorry for keep asking, because I can not test it till I reach the end of the month. to see it it will recognise it.
:

simple testing solution -- change the clock on your computer.