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: http://www.stsci.edu/~sontag/spicedocs/cspice/gdpool_c.html
Дата изменения: Sat Dec 17 06:09:04 2005 Дата индексирования: Mon Apr 11 00:02:33 2016 Кодировка: Поисковые слова: lightning |
Return the d.p. value of a kernel variable from the kernel pool.
KERNEL
VARIABLE I/O DESCRIPTION -------- --- -------------------------------------------------- name I Name of the variable whose value is to be returned. start I Which component to start retrieving for name room I The largest number of values to return. n O Number of values returned for name. values O Values associated with name. found O True if variable is in pool.
name is the name of the variable whose values are to be returned. If the variable is not in the pool with numeric type, found will be SPICEFALSE. start is the index of the first component of name to return. The index follows the C convention of being 0 based. If start is less than 0, it will be treated as 0. If start is greater than the total number of components available for name, no values will be returned (n will be set to zero). However, found will still be set to SPICETRUE room is the maximum number of components that should be returned for this variable. (Usually it is the amount of room available in the array values). If room is less than 1 the error SPICE(BADARRAYSIZE) will be signalled.
n is the number of values associated with name that are returned. It will always be less than or equal to room. If name is not in the pool with numeric type, no value is given to n. values is the array of values associated with name. If name is not in the pool with numeric type, no values are given to the elements of values. found is SPICETRUE if the variable is in the pool and has numeric type, SPICEFALSE if it is not.
None.
This routine provides the user interface to retrieving numeric data stored in the kernel pool. This interface allows you to retrieve the data associated with a variable in multiple accesses. Under some circumstances this alleviates the problem of having to know in advance the maximum amount of space needed to accommodate all kernel variables. However, this method of access does come with a price. It is always more efficient to retrieve all of the data associated with a kernel pool data in one call than it is to retrieve it in sections. This routine should be used in place of rtpool_c when possible as it avoids errors associated with writing data past the end of an array. See also the entry points gipool_c and gcpool_c.
The following code fragment demonstrates how the data stored in a kernel pool variable can be retrieved in pieces. Using the kernel "test.ker" which contains \begindata CTEST_VAL = ('LARRY', 'MOE', 'CURLY' ) ITEST_VAL = ( 3141, 186, 282 ) DTEST_VAL = ( 3.1415, 186.282, .0175 ) The program... #include <stdio.h> #include <string.h> #include "SpiceUsr.h" #include "SpiceZmc.h" #define NUMVALS 2 void main() { SpiceInt n; SpiceInt i; SpiceBoolean found; SpiceDouble vals[NUMVALS]; ldpool_c ( "test.ker" ); /. Is data available by that name. ./ gdpool_c ( "DTEST_VAL", 0, NUMVALS, &n, vals, &found ); /. If so, show me the values. ./ if ( !found ) { printf ( "No dp data available for DTEST_VAL.\n" ); } else { for ( i=0; i < NUMVALS; i++ ) { gdpool_c ( "DTEST_VAL", i, NUMVALS, &n, vals, &found ); printf ( "%f \n", vals[i] ); } } exit(0); } Output should be 186.282000 0.017500
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1) If the value of room is less than one the error SPICE(BADARRAYSIZE) is signalled. 2) If the input string pointer is null, the error SPICE(NULLPOINTER) will be signaled. 3) If the input string has length zero, the error SPICE(EMPTYSTRING) will be signaled.
None.
W.L. Taber (JPL) E.D. Wright (JPL)
None.
-CSPICE Version 2.1.0 22-JUN-1999 (EDW) Re-implemented routine without dynamically allocated, temporary strings. Added local variable to return boolean/logical values. This fix allows the routine to function if int and long are different sizes. -CSPICE Version 2.0.1 08-FEB-1998 (EDW) The start parameter is now zero based as per C convention. -CSPICE Version 1.0.1, 6-JAN-1998 (EDW) Replaced example routine. Included the data for a test kernel. -CSPICE Version 1.0.0, 25-OCT-1997 (EDW)
RETURN the d.p. value of a pooled kernel variable RETURN the numeric value of a pooled kernel variable