| dasopw_c |
|
Table of contents
Procedure
dasopw_c ( DAS, open for write )
void dasopw_c ( ConstSpiceChar * fname,
SpiceInt * handle )
AbstractOpen a DAS file for writing. Required_ReadingDAS KeywordsDAS FILES Brief_I/OVARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- fname I Name of a DAS file to be opened. handle O Handle assigned to the opened DAS file. Detailed_Input
fname is the name of a DAS file to be opened with write
access.
Detailed_Output
handle is the handle that is 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, an error is signaled by a
routine in the call tree of this routine.
2) If the specified file does not exist, an error is signaled by
a routine in the call tree of this routine.
3) If the specified file has already been opened, either by the
DAS file routines or by other code, an error is signaled by a
routine in the call tree of this routine. Note that this
response is not paralleled by dasopr_c, which allows you to open
a DAS file for reading even if it is already open for reading.
4) 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.
5) If the specified file cannot be opened properly, an error
is signaled by a routine in the call tree of this routine.
6) If the file record cannot be read, an error is signaled by a
routine in the call tree of this routine.
7) If the specified file is not a DAS file, as indicated by the
file's ID word, an error is signaled by a routine in the call
tree of this routine.
8) If no logical units are available, an error is signaled
by a routine in the call tree of this routine.
9) If the `fname' input string pointer is null, the error
SPICE(NULLPOINTER) is signaled.
10) If the `fname' input string has zero length, the error
SPICE(EMPTYSTRING) is signaled.
FilesSee argument `fname'. ParticularsMost DAS files require only read access. If you do not need to change the contents of a file, you should open it with dasopr_c. 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 containing 200 integer addresses set
to zero. Re-open the file for write access again, and write
to its addresses 1 through 200 in random-access fashion by
updating the file.
Example code begins here.
/.
Program dasopw_ex1
./
#include <stdio.h>
#include "SpiceUsr.h"
int main( )
{
/.
Local Parameters
./
#define DASNAM "dasopw_ex1.das"
#define IDATLN 200
/.
Local Variables
./
SpiceChar * type;
SpiceInt handle;
SpiceInt i;
SpiceInt idata [IDATLN];
SpiceInt j;
/.
Open a new DAS file. Reserve no comment records.
./
type = "TEST";
dasonw_c ( DASNAM, type, "TEST/DASOPW_EX1", 0, &handle );
/.
Append 200 integers to the file; after the data are
present, we're free to update it in any order we
please. (cleari_c zeros out an integer array.)
./
cleari_c ( IDATLN, idata );
dasadi_c ( handle, IDATLN, idata );
/.
Close the file.
./
dascls_c ( handle );
/.
Open the file again for writing.
./
dasopw_c ( DASNAM, &handle );
/.
Reset the data array, and read the data into it.
./
filli_c ( -1, IDATLN, idata );
dasrdi_c ( handle, 1, IDATLN, idata );
/.
Print the contents of the file before updating it.
./
printf( "Contents of %s before update:\n", DASNAM );
printf( "\n" );
for ( i = 0; i < 20; i++ )
{
for ( j = 0; j < 10; j++ )
{
printf( "%5d", idata[i*10+j] );
}
printf( "\n" );
}
/.
Now the integer logical addresses 1:200 can be
written to in random-access fashion. We'll fill them
in reverse order.
./
for ( i = IDATLN; i >= 1; i -= 1 )
{
dasudi_c ( handle, i, i, &i );
}
/.
Close the file.
./
dascls_c ( handle );
/.
Now make sure that we updated the file properly.
Open the file for reading and dump the contents
of the integer logical addresses 1:200.
./
dasopr_c ( DASNAM, &handle );
cleari_c ( IDATLN, idata );
dasrdi_c ( handle, 1, IDATLN, idata );
printf( "\n" );
printf( "Contents of %s after update:\n", DASNAM );
printf( "\n" );
for ( i = 0; i < 20; i++ )
{
for ( j = 0; j < 10; j++ )
{
printf( "%5d", idata[i*10+j] );
}
printf( "\n" );
}
return ( 0 );
}
When this program was executed on a Mac/Intel/cc/64-bit
platform, the output was:
Contents of dasopw_ex1.das before update:
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
Contents of dasopw_ex1.das after update:
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
101 102 103 104 105 106 107 108 109 110
111 112 113 114 115 116 117 118 119 120
121 122 123 124 125 126 127 128 129 130
131 132 133 134 135 136 137 138 139 140
141 142 143 144 145 146 147 148 149 150
151 152 153 154 155 156 157 158 159 160
161 162 163 164 165 166 167 168 169 170
171 172 173 174 175 176 177 178 179 180
181 182 183 184 185 186 187 188 189 190
191 192 193 194 195 196 197 198 199 200
Note that after run completion, a new DAS file exists in the
output directory.
RestrictionsNone. Literature_ReferencesNone. Author_and_InstitutionN.J. Bachman (JPL) J. Diaz del Rio (ODC Space) K.R. Gehringer (JPL) W.L. Taber (JPL) F.S. Turner (JPL) I.M. Underwood (JPL) Version
-CSPICE Version 1.0.1, 10-AUG-2021 (JDR)
Improved the -Exceptions section. Updated the header to comply with
NAIF standard and added complete code example.
-CSPICE Version 1.0.0, 11-NOV-2016 (NJB) (KRG) (WLT) (FST) (IMU)
Index_Entriesopen a DAS file for writing open a DAS file for write access |
Fri Dec 31 18:41:04 2021