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[netCDF #YZD-296984]: Read a vlen array in Fortran



The nf_put_vlen_element function is basically
a wrapper around a C function with this signature:
   int nc_put_vlen_element(int ncid, int typeid1,
                    nc_vlen_t *vlen_element, /*ptr to the nc_vlen_t object to 
build */
                    size_t len, /* value for nc_vlen_t.len */
                    const void *data /* value for nc_vlen_t.p */
                    )

This means that vlen and vlen_in must be a byte array of size
sizeof(nc_vlen_t).  Since you are passing a pointer to an integer
and sizeof(integer) < sizeof(nc_vlen_t), I would expect that you
are doing a bad memory write.  This may not show up immediately.

I would expect that if you ran your program with valgrind
(or some other memory leak detector) that it would
complain about writing in unallocated memory.
I would do this, but valgrind is linux only
and I am running cygwin/Windows. If you are on a linux
machine and can install valgrind, you might try this
command:
   valgrind --leak-check=full f90tst_vars_vlen.exe

BTW this code test only writes a single nc_vlen_t
instance. If you have an array of vlen, you need to
be more precise about your memory allocation.

Also re: nf_inq_typeids was 0.
At the point you called this, either you had the wrong group id (ncid)
or that group did not contain any user-defined types. Remember that
String is a primitive type, not a user-defined type.


=Dennis Heimbigner
  Unidata


Ticket Details
===================
Ticket ID: YZD-296984
Department: Support netCDF
Priority: Normal
Status: Closed
===================
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