| CALL_EXTERNAL and strarr() [message #18244] |
Wed, 08 December 1999 00:00 |
Richard Tyc
Messages: 69
Registered: June 1999
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Member |
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I need to call an external C function (unix/shared lib method) which
will collect a string array of different size strings. I have been
using call_external with success on returning other types (floats,
strings etc) but this seems more challenging. The problem being I don't
know how large each string will be in the string array so it needs to be
dynamically allocated.
I know the following can pass IN a string array and return a single
string:
replyStr = CALL_EXTERNAL('IDLquery_call.so','GetPatientList',strarr,$
N_ELEMENTS(strarr), /S_VALUE)
the key point in the C function being to make the returned string static
to avoid memory leaks.
Anyone care to point out how I might be able to retrieve a string array.
I was thinking about IDL_ImportArray or IDL_ImportNamedArray to create
an IDL Array.
so lets say in my C function I have
char *list[100] ; or should it be IDL_STRING *list100 ; ??????
and the function has gone off an filled this list with various sized
array strings.
(eg. list[0] = strdup("5char") list[1] = strdup("06char") where strdup
is using malloc implicitly)
Assuming I create an IDL array from this data, what mechanism do I have
of returning this data in the call_external function.
Thanks in Advance
Rich
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