struct problem

**robin171** · 10-13-2005

I have a hardware board with a 80186 proc. The time on the chip is set bij the function:

Code:

void rtxSetTimeDate(TimeDateStruct far* tds)

the struct is defined as following:

Code:

typedef struct tag_time
{
 unsigned char sec;  //seconds 0-59
 unsigned char min;  //minutes 0-59
 unsigned char hr;    //hours 0-23
 unsigned char dy;    //day 1-31
 unsigned char mn;   //month 1-12
 unsigned char yr;     //year 0-99
 unsigned char dow; //day of week (mon=1 - sun =7) 
 unsigned char dcen; //century if time/date is correct
}

I have declared a struct of this type: DateTime

The date and time is sent by telnet to the hardwareboard in the format: yyyymmdd hhmmss. I have 2 variables for the date and time:

Code:

char *time,*date;

now i try to put the data in the struct:

Code:

sscanf(date,"%4s%2s%2s",DateTime.yr,DateTime.mn,DateTime.dy);
sscanf(time,"%2s%2s%2s",DateTime.hr,DateTime.min,DateTime.sec);

rtxSetTimeDate(&DateTime);

it just returns NULL for all values

**Thantos** · 10-13-2005

try passing pointers to the objects in the sscanf call instead of just the object.

**robin171** · 10-13-2005

ok now i have this:

Code:

sscanf(date,"%4s%2s%2s",*DateTime.yr,*DateTime.mn,*DateTime.dy);
sscanf(time,"%2s%2s%2s",*DateTime.hr,*DateTime.min,*DateTime.sec);

rtxSetTimeDate(&DateTime);

I get the error: invalid indirection

**prog-bman** · 10-13-2005

By pointer to the object he was saying pass in the address of using the & which will actually modify the data

**robin171** · 10-13-2005

Ok i get it, i have changed it to:

Code:

sscanf(date,"%2s%2s%2s%2s",&DateTime.dcen,&DateTime.yr,&DateTime.mn,&DateTime.dy);
sscanf(time,"%2s%2s%2s",&DateTime.hr,&DateTime.min,&DateTime.sec);

rtxSetTimeDate(&DateTime);

for testing, i've sent the following date and time to the hardware board: 20050915 121533

I check the code with printf(the stdout of the hardware board is telnet):

Code:

printf("year:%s month:%s day:%s",DateTime.yr,DateTime.mn,DateTime.dy);
printf("hours:%s minutes:%s seconds:%s",DateTime.hr,DateTime.min,DateTime.sec);

**Dave_Sinkula** · 10-13-2005

Are you changing your struct to strings as well? Otherwise, you may want to use temporary ints to scan the data into, and then copy to your struct. (I'm assuming you instead want "little ints".)

Code:

#include <stdio.h>

typedef struct tag_time
{
   unsigned char sec;  // seconds 0-59
   unsigned char min;  // minutes 0-59
   unsigned char hr;   // hours 0-23
   unsigned char dy;   // day 1-31
   unsigned char mn;   // month 1-12
   unsigned char yr;   // year 0-99
   unsigned char dow;  // day of week (mon=1 - sun =7)
   unsigned char dcen; // century if time/date is correct
} TimeDateStruct;

int main(void)
{
   static const char date[] = "20051013", time[] = "150937";
   int dcen, yr, mn, dy, hr, min, sec;
   TimeDateStruct DateTime = {0};
   if ( sscanf(date,"%2d%2d%2d%2d", &dcen, &yr, &mn,  &dy) == 4 )
   {
      DateTime.dcen = dcen;
      DateTime.yr   = yr;
      DateTime.mn   = mn;
      DateTime.dy   = dy;
   }
   if ( sscanf(time,"%2d%2d%2d", &hr, &min, &sec) == 3 )
   {
      DateTime.hr  = hr;
      DateTime.min = min;
      DateTime.sec = sec;
   }
   printf("DateTime.dcen = %d\n", DateTime.dcen);
   printf("DateTime.yr   = %d\n", DateTime.yr);
   printf("DateTime.mn   = %d\n", DateTime.mn);
   printf("DateTime.dy   = %d\n", DateTime.dy);
   printf("DateTime.hr   = %d\n", DateTime.hr);
   printf("DateTime.min  = %d\n", DateTime.min);
   printf("DateTime.sec  = %d\n", DateTime.sec);
   return 0;
}

/* my output
DateTime.dcen = 20
DateTime.yr   = 5
DateTime.mn   = 10
DateTime.dy   = 13
DateTime.hr   = 15
DateTime.min  = 9
DateTime.sec  = 37
*/

**robin171** · 10-13-2005

thank you very much! it works!

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