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Creating arrays of structures with Callable C [message #43500]

Mon, 18 April 2005 10:29

jicicuendez
Messages: 12
Registered: November 2001

Junior Member

Hi everybody,

I am trying to use callable C/C++ code to generate a plot with IDL
from another application and there are a couple of things that I am
stuck with. Any help will be most appreciated.

First, in the IDL documentation, there is an example of how to create
and structure (page 176). This is done through a two-step procedure of
creating an IDL_STRUCT_TAG_DEF and then creating an structure with the
data itself such as

typedef struct time_series
{
double x[100];
double y[100];
char RGB[3];
int long nElements;
IDL_STRING source[1];

}
TIME_SERIES;

The problem is that in principle the number of elements is not known
until is provided so I would like to substitute this by:

typedef struct time_series
{
double *x;
double *y;
char RGB[3];
int long nElements;
IDL_STRING source[1];

}
TIME_SERIES;

and where memory has been allocated with new. Apparently the structure
can be created in the idl session with the IDL_MakeStruct function but
when I try to use such structure with and idl command it gives a
memory exception. Does anybody know how to avoid this problem?

Cheers,
Juan

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		Creating arrays of structures with Callable C By: jicicuendez on Mon, 18 April 2005 10:29
		Re: Creating arrays of structures with Callable C By: Nigel Wade on Tue, 19 April 2005 02:09

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