Index Page spkopn_c
A B C D E F G H I J K L M N O P Q R S T U V W X
Procedure Abstract Required_Reading Keywords Brief_I/O Detailed_Input | Detailed_Output Parameters Exceptions Files Particulars Examples | Restrictions Literature_References Author_and_Institution Version Index_Entries
#### Procedure
       void spkopn_c ( ConstSpiceChar * name,
                       ConstSpiceChar * ifname,
                       SpiceInt         ncomch,
                       SpiceInt       * handle  )
#### Abstract
       Create a new SPK file, returning the handle of the opened file.
#### Required_Reading
       SPK
#### Keywords
       SPK
#### Brief_I/O
       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       name       I   The name of the new SPK file to be created.
       ifname     I   The internal filename for the SPK file.
       ncomch     I   The number of characters to reserve for comments.
       handle     O   The handle of the opened SPK file.
#### Detailed_Input
       name     The name of the new SPK file to be created.

       ifname   The internal filename for the SPK file that is being
                created. The internal filename may be up to 60 characters
                long. If you do not have any conventions for tagging your
                files, an internal filename of "SPK_file" is perfectly
                acceptable. You may also leave it blank if you like.

       ncomch   This is the space, measured in characters, to be
                initially set aside for the comment area when a new SPK
                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 SPK
                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   The handle of the opened SPK 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 input string pointers are null, the error
          SPICE(NULLPOINTER) will be signaled.

       4) If any input strings have length zero, the error
          SPICE(EMPTYSTRING) will be signaled.
#### Files
       See arguments name and handle.
#### Particulars
       Open a new SPK file, reserving room for comments if requested.
#### Examples
       Suppose that you want to create a new SPK file called 'new.spk'
       that contains a single type 5 SPK segment and has room for at
       least 5000 comment characters. The following code fragment should
       take care of this for you, assuming that all of the variables
       passed to the SPK type 5 segment writer have appropriate values
       and no errors occur.

          #include "SpiceUsr.h"
             .
             .
             .
          name   = "new.spk";
          ifname = "test spk file";

          spkopn_c ( name, ifname, 5000,  &handle );
          spkw05_c ( handle, objid, cntrid, cframe, etbeg,
                     etend, segmid, cntrgm, nstate, state,
                     epoch                                 );
          spkcls_c ( handle );
#### Restrictions
       None.
#### Literature_References
       None.
#### Author_and_Institution
       F.S. Turner        (JPL)
#### Version
       -CSPICE Version 1.1.0, 20-APR-2005 (NJB)

           Bug fix:  address, rather than value, of `ncomch' is now
           passed to spkopn_.

           Header comments indicating that `ncomch' is not used have
           been deleted.

       -CSPICE Version 1.0.0, 16-MAR-1999 (FST)
#### Index_Entries
       open a new spk file
#### Link to routine spkopn_c source file spkopn_c.c

    Wed Jun  9 13:05:30 2010