| dasonw_c |
|
Table of contents
Procedure
dasonw_c ( DAS, open new file )
void dasonw_c ( ConstSpiceChar * fname,
ConstSpiceChar * ftype,
ConstSpiceChar * ifname,
SpiceInt ncomr,
SpiceInt * handle )
AbstractOpen a new DAS file and set the file type. Required_ReadingDAS KeywordsDAS FILES Brief_I/OVARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- fname I Name of a DAS file to be opened. ftype I Mnemonic code for type of data in the DAS file. ifname I Internal file name. ncomr I Number of comment records to allocate. handle O Handle assigned to the opened DAS file. Detailed_Input
fname is the name of a new DAS file to be created (and
consequently opened for write access).
ftype is a string indicating the type of data placed into a DAS
file. The first nonblank character and the three, or
fewer, characters immediately following it are stored as
the part of the file's ID word following the forward
slash. It is an error if `ftype' is blank or empty.
The file type may not contain any nonprinting characters.
`ftype' is case sensitive.
NAIF has reserved for its own use file types
consisting of the upper case letters (A-Z) and the
digits 0-9. NAIF recommends lower case or mixed case
file types be used by all others in order to avoid any
conflicts with NAIF file types.
ifname is a string containing the internal file name for the new file.
The name may contain as many as 60 characters, excluding the
terminating null. This should uniquely identify the file.
ncomr is the number of comment records to allocate.
Allocating comment records at file creation time may
reduce the likelihood of having to expand the
comment area later.
Detailed_Output
handle is the file handle associated with the file. This
handle is used to identify the file in subsequent
calls to other DAS routines.
ParametersNone. Exceptions
1) If the input filename is blank, the error SPICE(BLANKFILENAME)
is signaled by a routine in the call tree of this routine.
2) If the specified file cannot be opened without exceeding the
maximum allowed number of open DAS files, the error
SPICE(DASFTFULL) is signaled by a routine in the call tree of
this routine. No file will be created.
3) If the file cannot be opened properly, an error is signaled
by a routine in the call tree of this routine. No file will
be created.
4) If the initial records in the file cannot be written, an
error is signaled by a routine in the call tree of this
routine. No file will be created.
5) If the file type is blank, the error SPICE(BLANKFILETYPE) is
signaled by a routine in the call tree of this routine.
6) If the file type contains nonprinting characters---decimal
0-31 and 127-255---, the error SPICE(ILLEGALCHARACTER) is
signaled by a routine in the call tree of this routine.
7) If the number of comment records allocated `ncomr' is negative,
the error SPICE(INVALIDCOUNT) is signaled by a routine in the
call tree of this routine.
8) If any of the `fname', `ftype' or `ifname' input string
pointers is null, the error SPICE(NULLPOINTER) is signaled.
9) If any of the `fname', `ftype' or `ifname' input strings has
zero length, the error SPICE(EMPTYSTRING) is signaled.
FilesSee argument `fname'. ParticularsThe DAS files created by this routine have initialized file records. This routine creates a new DAS file and sets the type of the file to the mnemonic code passed to it. 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) Create a new DAS file and add 200 integers to it. Close the
file, then re-open it and read the data back out.
Example code begins here.
/.
Program dasonw_ex1
./
#include <stdio.h>
#include "SpiceUsr.h"
int main( )
{
/.
Local parameters.
./
#define FNAME "dasonw_ex1.das"
/.
Local variables.
./
SpiceChar * type;
SpiceInt data [200];
SpiceInt handle;
SpiceInt i;
SpiceInt j;
/.
Open a new DAS file. Use the file name as the internal
file name, and reserve no records for comments.
./
type = "TEST";
dasonw_c ( FNAME, type, FNAME, 0, &handle );
/.
Fill the array `data' with the integers 1 through
100, and add this array to the file.
./
for ( i = 1; i <= 100; i++ )
{
data[i-1] = i;
}
dasadi_c ( handle, 100, data );
/.
Now append the array `data' to the file again.
./
dasadi_c ( handle, 100, data );
/.
Close the file.
./
dascls_c ( handle );
/.
Now verify the addition of data by opening the
file for read access and retrieving the data.
./
dasopr_c ( FNAME, &handle );
dasrdi_c ( handle, 1, 200, data );
/.
Dump the data to the screen. We should see the
sequence 1, 2, ..., 100, 1, 2, ... , 100.
./
printf( "\n" );
printf( "Data from \"%s\":\n", FNAME );
printf( "\n" );
for ( i = 0; i < 20; i++ )
{
for ( j = 0; j < 10; j++ )
{
printf( "%5d", data[i*10+j] );
}
printf( "\n" );
}
/.
Close the file.
./
dascls_c ( handle );
return ( 0 );
}
When this program was executed on a Mac/Intel/cc/64-bit
platform, the output was:
Data from "dasonw_ex1.das":
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100
Note that after run completion, a new DAS file exists in the
output directory.
RestrictionsNone. Literature_ReferencesNone. Author_and_InstitutionJ. Diaz del Rio (ODC Space) Version-CSPICE Version 1.0.0, 09-JUL-2021 (JDR) Index_Entriesopen a new DAS file open a new DAS file with write access |
Fri Dec 31 18:41:04 2021