| IDL_MakeStruct() [message #16326] |
Wed, 14 July 1999 00:00 |
Chutter
Messages: 1
Registered: July 1999
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Junior Member |
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I have nested structures in some "c" code which I wish to access in IDL
via Call_External. Supposedly, the type field of the structure can be:
void *type; /* This may be either a pointer to another
structure definition, or a simple IDL
type code (IDL_TYP_*) cast to void
(e.g. (void *) IDL_TYP_BYTE). If this
field is NULL, it indicates that IDL
should search for a structure of the
given name and fill in the pointer to
its structure definition. */
from external/export.h
What is the syntax for using a pointer to another structure definition?
The following simple example uses NULL for the type, but I want to a
pointer to another structure definition so that I can choose the value
for the name field.
Thanks for help.
#include "/usr/local/rsi/idl/external/export.h"
int main(int argc, char **argv)
{
static IDL_LONG one = 1;
static IDL_STRUCT_TAG_DEF substruct_tags[] = {
{"P", 0, (void *) IDL_TYP_INT},
{"Q", 0, (void *) IDL_TYP_INT},
{0}
};
static IDL_LONG matrix_dims[] = {2,2,2};
static IDL_LONG substruct_dims[] = {1,1};
static IDL_STRUCT_TAG_DEF s_tags[] = {
{ "MATRIX", matrix_dims, (void *) IDL_TYP_FLOAT},
{ "SUBSTRUCT", substruct_dims, NULL}, /* NULL is a placeholder */
{0}
};
typedef struct substruct {
short int p;
short int q;
} SUBSTRUCT;
typedef struct data_struct {
float mat [2] [2];
SUBSTRUCT sub;
} DATA_STRUCT;
static DATA_STRUCT s_data, *s_new_data;
void *s;
IDL_VPTR v;
int i,j;
s_data.mat[0][0] = s_data.mat[1][1] = 1.0;
s_data.mat[0][1] = s_data.mat[1][0] = 0.0;
s_data.sub.p = -999;
s_data.sub.q = +1001;
s = IDL_MakeStruct("SUBSTRUCT", substruct_tags); /* define SUBSTRUCT
*/
s_tags[1].type = s; /* tell s_tags about
it */
s = IDL_MakeStruct("FOO", s_tags);
printf("Almost all folks.\n");
v = IDL_ImportNamedArray("FOO",1,&one,IDL_TYP_STRUCT,
(UCHAR *) &s_data, 0, s);
s_new_data = (DATA_STRUCT *) v->value.s.arr->data;
for (i=0;i<2;i++)
for (j=0;j<2;j++)
printf("%f\n",s_new_data->mat[i][j]);
printf("%i\n", s_new_data->sub.p);
printf("%i\n", s_new_data->sub.q);
printf("That's all folks.\n");
}
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