void spkobj_c ( ConstSpiceChar * spk,
SpiceCell * ids )
Find the set of ID codes of all objects in a specified SPK file.
Variable I/O Description
-------- --- --------------------------------------------------
spk I Name of SPK file.
ids I/O Set of ID codes of objects in SPK file.
spk is the name of an SPK file.
ids is an initialized CSPICE set data structure.
`ids' optionally may contain a set of ID codes on
input; on output, the data already present in
`ids' will be combined with ID code set found for the
If `ids' contains no data on input, its size and
cardinality still must be initialized.
ids is a CSPICE set data structure which contains
the union of its contents upon input with the set
of ID codes of each object for which ephemeris
data are present in the indicated SPK file. The
elements of CSPICE sets are unique; hence each
ID code in `ids' appears only once, even if the SPK
file contains multiple segments for that ID code.
See the Examples section below for a complete
example program showing how to retrieve the ID
codes from `ids'.
1) If the input file has transfer format, the error
SPICE(INVALIDFORMAT) is signaled.
2) If the input file is not a transfer file but has architecture
other than DAF, the error SPICE(BADARCHTYPE) is signaled.
3) If the input file is a binary DAF file of type other than
SPK, the error SPICE(BADFILETYPE) is signaled.
4) If the SPK file cannot be opened or read, the error will
be diagnosed by routines called by this routine.
5) If the size of the output set argument `ids' is insufficient to
contain the actual number of ID codes of objects covered by
the indicated SPK file, the error will be diagnosed by
routines called by this routine.
6) The error SPICE(EMPTYSTRING) is signaled if the input
string `spk' does not contain at least one character, since the
input string cannot be converted to a Fortran-style string in
7) The error SPICE(NULLPOINTER) is signaled if the input string
pointer `spk' is null.
This routine reads an SPK file.
This routine provides an API via which applications can determine
the set of objects for which there are ephemeris data in a
specified SPK file.
1) Display the coverage for each object in a specified SPK file.
Find the set of objects in the file. Loop over the contents
of the ID code set: find the coverage for each item in the
set and display the coverage.
#define FILSIZ 256
#define MAXIV 1000
#define WINSIZ ( 2 * MAXIV )
#define TIMLEN 51
#define MAXOBJ 1000
SPICEDOUBLE_CELL ( cover, WINSIZ );
SPICEINT_CELL ( ids, MAXOBJ );
SpiceChar lsk [ FILSIZ ];
SpiceChar spk [ FILSIZ ];
SpiceChar timstr [ TIMLEN ];
Load a leapseconds kernel for output time conversion.
SPKCOV itself does not require a leapseconds kernel.
prompt_c ( "Name of leapseconds kernel > ", FILSIZ, lsk );
furnsh_c ( lsk );
Get name of SPK file.
prompt_c ( "Name of SPK file > ", FILSIZ, spk );
Find the set of objects in the SPK file.
spkobj_c ( spk, &ids );
We want to display the coverage for each object. Loop over
the contents of the ID code set, find the coverage for
each item in the set, and display the coverage.
for ( i = 0; i < card_c( &ids ); i++ )
Find the coverage window for the current object.
Empty the coverage window each time so we don't
include data for the previous object.
obj = SPICE_CELL_ELEM_I( &ids, i );
scard_c ( 0, &cover );
spkcov_c ( spk, obj, &cover );
Get the number of intervals in the coverage window.
niv = wncard_c ( &cover );
Display a simple banner.
printf ( "%s\n", "========================================" );
printf ( "Coverage for object %d\n", (int)obj );
Convert the coverage interval start and stop times to TDB
for ( j = 0; j < niv; j++ )
Get the endpoints of the jth interval.
wnfetd_c ( &cover, j, &b, &e );
Convert the endpoints to TDB calendar
format time strings and display them.
timout_c ( b,
"YYYY MON DD HR:MN:SC.### (TDB) ::TDB",
printf ( "\n"
timout_c ( e,
"YYYY MON DD HR:MN:SC.### (TDB) ::TDB",
printf ( "Stop: %s\n", timstr );
return ( 0 );
1) If an error occurs while this routine is updating the set
`ids', the set may be corrupted.
N.J. Bachman (JPL)
-CSPICE Version 1.0.3, 14-JUN-2016 (EDW)
Edit to example program to use "%d" with explicit casts
to int for printing SpiceInts with printf.
-CSPICE Version 1.0.2, 01-JUL-2014 (NJB)
Updated index entries.
-CSPICE Version 1.0.1, 30-NOV-2007 (NJB)
Corrected bug in first example program in header:
program now empties result window prior to collecting
data for each object. Deleted declaration of unused
constant NAMLEN. Updated example to use wncard_c
rather than card_c.
-CSPICE Version 1.0.0, 30-DEC-2004 (NJB)
find id codes of ephemeris objects in spk file
find id codes of bodies in spk file