Procedure

   pckopn_c ( PCK, open new file ) 

   void pckopn_c ( ConstSpiceChar   * name,
                   ConstSpiceChar   * ifname,
                   SpiceInt           ncomch,
                   SpiceInt         * handle  )

Abstract

   Create a new PCK file, returning the handle of the opened file.

Required_Reading

   PCK

Keywords

   PCK

Brief_I/O

   VARIABLE  I/O  DESCRIPTION
   --------  ---  --------------------------------------------------
   name       I   The name of the PCK file to be opened.
   ifname     I   The internal filename for the PCK.
   ncomch     I   The number of characters to reserve for comments.
   handle     O   The handle of the opened PCK file.

Detailed_Input

   name        is the name of the PCK file to be created.

   ifname      is the internal filename for the PCK file that is being
               created. The internal filename may be up to 60 characters
               long. `ifname' may not contain non-printing characters;
               otherwise there are no restrictions on its contents.

   ncomch      is the space, measured in characters, to be
               initially set aside for the comment area when a new PCK
               file is opened. The amount of space actually set aside
               may be greater than the amount requested, due to the
               manner in which comment records are allocated in an PCK
               file. However, the amount of space set aside for comments
               will always be at least the amount that was requested.

               The value of ncomch should be greater than or equal to
               zero, i.e., 0 <= ncomch. A negative value, should one
               occur, will be assumed to be zero.

Detailed_Output

   handle      is the handle of the opened PCK file. If an error occurs
               when opening the file, the value of this variable should
               not be used, as it will not represent a valid handle.

Parameters

   None.

Exceptions

   1)  If the value of `ncomch' is negative, a value of zero (0) will
       be used for the number of comment characters to be set aside
       for comments.

   2)  If an error occurs while attempting to open a CK file the
       value of `handle' will not represent a valid file handle.

   3)  If any of the `name' or `ifname' input string pointers is
       null, the error SPICE(NULLPOINTER) is signaled.

   4)  If any of the `name' or `ifname' input strings has zero
       length, the error SPICE(EMPTYSTRING) is signaled.

Files

   See descriptions of `name' and `handle'.

Particulars

   Open a new PCK file, reserving room for comments if requested.

Examples

   The numerical results shown for this example may differ across
   platforms. The results depend on the SPICE kernels used as
   input, the compiler and supporting libraries, and the machine
   specific arithmetic implementation.

   1) Suppose that you have sets of Chebyshev polynomial
      coefficients in an array pertaining to the orientation of
      the Moon body-fixed frame with the frame class ID 301
      relative to the J2000 reference frame, and want
      to put these into a type 2 segment PCK file. The following
      example could be used to add one new type 2 segment. To add
      multiple segments, put the call to pckw02_c in a loop.


      Example code begins here.


      /.
         Program pckopn_ex1
      ./
      #include "SpiceUsr.h"

      int main( )
      {

         /.
         Local parameters
         ./
         #define FNAME        "pckopn_ex1.bpc"
         #define BODY         301
         #define POLYDG       9
         #define SZCDAT       60

         /.
         Local variables
         ./
         SpiceChar          * ifname;
         SpiceChar          * segid;

         SpiceDouble          btime;
         SpiceDouble          first;
         SpiceDouble          intlen;
         SpiceDouble          last;

         SpiceInt             handle;
         SpiceInt             n;
         SpiceInt             nresvc;

         /.
         Set the input data: RA/DEC/W coefficients,
         begin time for the first record, start/end times
         for the segment, length of the time covered by
         each record, and number of logical records.

         `cdata' contains the ra/dec/w coefficients: first the
         the polydeg + 1 for the RA first record, then the
         polydeg + 1 for the DEC first record, then the
         polydeg +1 for W first record, then the polydeg + 1
         for the RA second record, and so on.
         ./
         SpiceDouble          cdata  [SZCDAT] = {
                       -5.4242086033301107e-002, -5.2241405162792561e-005,
                        8.9751456289930307e-005, -1.5288696963234620e-005,
                        1.3218870864581395e-006,  5.9822156790328180e-007,
                       -6.5967702052551211e-008, -9.9084309118396298e-009,
                        4.9276055963541578e-010,  1.1612267413829385e-010,
                        0.42498898565916610,      1.3999219324235620e-004,
                       -1.8855140511098865e-005, -2.1964684808526649e-006,
                        1.4229817868138752e-006, -1.6991716166847001e-007,
                       -3.4824688140649506e-008,  2.9208428745895990e-009,
                        4.4217757657060300e-010, -3.9211207055305402e-012,
                        2565.0633504619473,       0.92003769451305328,
                       -8.0503797901914501e-005,  1.1960860244433900e-005,
                       -1.2237900518372542e-006, -5.3651349407824562e-007,
                        6.0843372260403005e-008,  9.0211287487688797e-009,
                       -4.6460429330339309e-010, -1.0446918704281774e-010,
                       -5.3839796353225056e-002,  4.3378021974424991e-004,
                        4.8130091384819459e-005, -1.2283066272873327e-005,
                       -5.4099296265403208e-006, -4.4237368347319652e-007,
                        1.3004982445546169e-007,  1.9017128275284284e-008,
                       -7.0368223839477803e-011, -1.7119414526133175e-010,
                        0.42507987850614548,     -7.1844899448557937e-005,
                       -5.1052122872412865e-005, -8.9810401387721321e-006,
                       -1.4611718567948972e-007,  4.0883847771062547e-007,
                        4.6812854485029333e-008, -4.5698075960784951e-009,
                       -9.8679875320349531e-010, -7.9392503778178240e-011,
                        2566.9029069934054,       0.91952244801740568,
                       -6.0426151041179828e-005,  1.0850559330577959e-005,
                        5.1756033678137497e-006,  4.2127585555214782e-007,
                       -1.1774737441872970e-007, -1.7397191490163833e-008,
                        5.8908810244396165e-012,  1.4594279337955166e-010 };

         first  =   -43200.0;
         last   =  1339200.0;
         btime  =  first;
         intlen =   691200.0;
         n      =  2;

         /.
         Open a new PCK file.  For simplicity, we will not
         reserve any space for the comment area, so the
         number of reserved comment characters is zero.
         The variable `ifname' is the internal file name.
         ./
         nresvc  =  0;
         ifname  =  "Test PCK/Created 04-SEP-2019";

         pckopn_c ( FNAME, ifname, nresvc, &handle );

         /.
         Create a segment identifier.
         ./
         segid = "MY_SAMPLE_PCK_TYPE_2_SEGMENT";

         /.
         Write the segment.
         ./
         pckw02_c ( handle, BODY, "J2000", first, last, segid,
                    intlen, n,    POLYDG,  cdata, btime       );

         /.
         Close the file.
         ./
         pckcls_c ( handle );

         return ( 0 );
      }


      When this program is executed, no output is presented on
      screen. After run completion, a new PCK type 2 exists in
      the output directory.

Restrictions

   None.

Literature_References

   None.

Author_and_Institution

   N.J. Bachman        (JPL)
   J. Diaz del Rio     (ODC Space)
   K.R. Gehringer      (JPL)

Version

   -CSPICE Version 1.0.1, 04-AUG-2021 (JDR)

       Edited the header to comply with NAIF standard. Added
       complete code examples based on existing fragment.

   -CSPICE Version 1.0.0, 16-DEC-2016 (NJB) (KRG)

Index_Entries

   open a new PCK file

Link to routine pckopn_c source file pckopn_c.c