Index of Functions: A B C D E F G H I J K L M N O P Q R S T U V W X
Index Page ekcls_c

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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

       ekcls_c ( EK, close file )

       void ekcls_c ( SpiceInt handle )

#### Abstract

       Close an E-kernel.

#### Required_Reading

       EK

#### Keywords

       EK
       FILES
       UTILITY

#### Brief_I/O

       VARIABLE  I/O  DESCRIPTION
       --------  ---  --------------------------------------------------
       handle     I   EK file handle.

#### Detailed_Input

       handle      is the file handle of an EK to be closed. Note
                   that EKs open for writing must be closed by this
                   routine in order to be valid.

#### Detailed_Output

       None.

#### Parameters

       None.

#### Exceptions

       1)  If the indicated file is not recognized, no error is
           signaled.

       2)  If an I/O error occurs while reading or writing the indicated
           file, the error is signaled by a routine in the call tree of
           this routine.

#### Files

       See the EK Required Reading for a discussion of the EK file
       format.

#### Particulars

       This routine should be used to close open EK files. EK files
       open for writing *must* be closed by this routine in order to be
       valid. EK files open for read access should also be closed using
       this routine.

#### 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) The following program demonstrates how to create a new EK and
          add data to a character column in a given record within the
          file, how to update the data in this record, and how to read
          the data from it.

          The example shows the effect of the ekcls_c calls when the EK
          file has been opened for write or read access.

          Example code begins here.

          /.
             Program ekcls_ex1
          ./
          #include <stdio.h>
          #include <string.h>
          #include "SpiceUsr.h"

          int main( )
          {

             /.
             Local constants.
             ./
             #define EKNAME       "ekcls_ex1.bdb"
             #define IFNAME       "Test EK"
             #define TABLE        "CHR_DATA"
             #define CVLEN        10
             #define DECLEN       201
             #define MAXVAL       4
             #define NCOLS        2
             #define NROWS        6
             #define NRESVC       0

             /.
             Local variables
             ./
             SpiceChar            cdecls [NCOLS] [DECLEN];
             SpiceChar            cnames [NCOLS] [SPICE_EK_CSTRLN];
             SpiceChar            cvals  [MAXVAL][CVLEN];

             SpiceInt             handle;
             SpiceInt             i;
             SpiceInt             nvals;
             SpiceInt             recno;
             SpiceInt             segno;

             SpiceBoolean         isnull;

             /.
             Open a new EK file.  For simplicity, we won't
             reserve space for the comment area, so the
             number of reserved comment characters is zero.
             The constant IFNAME is the internal file name.
             ./
             ekopn_c ( EKNAME, IFNAME, NRESVC, &handle );

             /.
             Set up the table and column names and declarations
             for the CHR_DATA segment.  We'll index all of
             the columns.
             ./
             strcpy( cnames[0], "CHR_COL_1" );
             strcpy( cdecls[0], "DATATYPE = CHARACTER*(*), "
                                "INDEXED = TRUE, NULLS_OK = TRUE" );

             strcpy( cnames[1], "CHR_COL_2" );
             strcpy( cdecls[1], "DATATYPE = CHARACTER*(9), "
                                "SIZE = VARIABLE, NULLS_OK = TRUE" );

             /.
             Start the segment.
             ./
             ekbseg_c ( handle, TABLE,  NCOLS,   SPICE_EK_CSTRLN,
                        cnames, DECLEN, cdecls, &segno           );

             for ( i = 0; i < NROWS; i++ )
             {

                ekappr_c ( handle, segno, &recno );

                isnull = ( i == 1 );

                sprintf  ( cvals[0], "%d", i );
                ekacec_c ( handle, segno, recno, cnames[0],
                           1,      CVLEN, cvals, isnull    );

                /.
                Array-valued columns follow.
                ./
                sprintf  ( cvals[0], "%d", 10*i     );
                sprintf  ( cvals[1], "%d", 10*i + 1 );
                sprintf  ( cvals[2], "%d", 10*i + 2 );
                sprintf  ( cvals[3], "%d", 10*i + 3 );
                ekacec_c ( handle, segno, recno, cnames[1],
                           4,      CVLEN, cvals, isnull    );

             }

             /.
             End the file.
             ./
             ekcls_c ( handle );

             /.
             Open the EK for write access.
             ./
             ekopw_c ( EKNAME, &handle );

             /.
             Negate the values in the odd-numbered records
             using the update routines.
             ./
             for ( i = 1; i < NROWS; i = i+2 )
             {
                recno = i;

                isnull = ( i == 1 );

                sprintf  ( cvals[0], "%d", -i );
                ekucec_c ( handle, segno, recno, cnames[0],
                           1,      CVLEN, cvals, isnull    );

                /.
                Array-valued columns follow.
                ./
                sprintf  ( cvals[0], "%d", -10*i       );
                sprintf  ( cvals[1], "%d", -(10*i + 1) );
                sprintf  ( cvals[2], "%d", -(10*i + 2) );
                sprintf  ( cvals[3], "%d", -(10*i + 3) );
                ekucec_c ( handle, segno, recno, cnames[1],
                           4,      CVLEN, cvals, isnull    );

             }

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

             /.
             Open the created file. Show the values added.
             ./
             ekopr_c ( EKNAME, &handle );

             for ( i = 0; i < NROWS; i++ )
             {

                ekrcec_c ( handle, segno, i,      cnames[0],
                           CVLEN, &nvals, cvals, &isnull    );

                if ( ! isnull )
                {

                   printf( "Data from column:  %s\n", cnames[0] );
                   printf( "   record number:  %d\n", i );
                   printf( "   values       :  %s\n", cvals[0] );
                   printf( " \n" );

                }
                else
                {

                   printf( "Record  %d flag is NULL.\n", i );
                   printf( " \n" );

                }

                /.
                Array-valued columns follow.
                ./
                ekrcec_c ( handle, segno, i,      cnames[1],
                           CVLEN, &nvals, cvals, &isnull    );

                if ( ! isnull )
                {

                   printf( "Data from column:  %s\n", cnames[1] );
                   printf( "   record number:  %d\n", i );
                   printf( "   values       :  %s  %s  %s  %s\n",
                                         cvals[0], cvals[1], cvals[2], cvals[3] );
                   printf( " \n" );

                }

             }

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

             return ( 0 );
          }

          When this program was executed on a Mac/Intel/cc/64-bit
          platform, the output was:

          Data from column:  CHR_COL_1
             record number:  0
             values       :  0

          Data from column:  CHR_COL_2
             record number:  0
             values       :  0          1          2          3

          Record  1 flag is NULL.

          Data from column:  CHR_COL_1
             record number:  2
             values       :  2

          Data from column:  CHR_COL_2
             record number:  2
             values       :  20         21         22         23

          Data from column:  CHR_COL_1
             record number:  3
             values       :  -3

          Data from column:  CHR_COL_2
             record number:  3
             values       :  -30        -31        -32        -33

          Data from column:  CHR_COL_1
             record number:  4
             values       :  4

          Data from column:  CHR_COL_2
             record number:  4
             values       :  40         41         42         43

          Data from column:  CHR_COL_1
             record number:  5
             values       :  -5

          Data from column:  CHR_COL_2
             record number:  5
             values       :  -50        -51        -52        -53

          Note that the second record does not appear due to setting the
          `isnull' flag to true for that record. The odd value record
          numbers have negative values as a result of the update calls.

          After run completion, a new EK exists in the output directory.

#### Restrictions

       None.

#### Literature_References

       None.

#### Author_and_Institution

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

#### Version

       -CSPICE Version 1.1.1, 06-JUL-2021 (JDR)

           Edited the header to comply with NAIF standard. Added complete
           code example and removed non-applicable restriction.

       -CSPICE Version 1.1.0, 23-JUL-2001 (NJB)

           Removed tab characters from source file.

       -CSPICE Version 1.0.0, 31-MAR-1998 (NJB)

           Based on SPICELIB Version 1.0.0, 26-SEP-1995 (NJB)

#### Index_Entries

       close EK

#### Link to routine ekcls_c source file ekcls_c.c

    Fri Dec 31 18:41:05 2021