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: http://www.stsci.edu/~sontag/spicedocs/cspice/spkopn_c.html
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Create a new SPK file, returning the handle of the opened file.
SPK
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.
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.
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.
None.
Open a new SPK file, reserving room for comments if requested.
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 );
None.
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.
See arguments name and handle.
F.S. Turner (JPL)
None.
-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)
open a new spk file