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[netCDF #DXE-930963]: example code for using scalar string variables
- Subject: [netCDF #DXE-930963]: example code for using scalar string variables
- Date: Thu, 30 Nov 2017 14:42:12 -0700
Hello Alex,
My sincere apologies for the delayed response. Your code largely looks fine,
except you need to allocate memory for `data_in`. When deciding on the size of
the variable you'll be reading in to, you should ensure it is large enough for
the characters AND to hold the terminating null character at the end. The
string should be null terminated when read, so it is safe to allocate a larger
variable than you will need.
I hope this helps and again please accept my apologies for the delayed response!
-Ward
> Hello!
>
> I am trying to use C API to store and retrieve a scalar string. Here is
> my code which seems to work. Could you please take a look at let me know
> whether the API is used as intended:
>
> #define ERR (fprintf(stderr, "Error on line %d of %s.", __LINE__, __FILE__))
>
> int main()
> {
> int ncid = 0;
> int char_varid = 0;
>
> if(nc_create("test.nc", NC_NETCDF4, &ncid)) ERR;
> if(nc_def_var(ncid, "String_Var", NC_STRING, 0, 0, &char_varid)) ERR;
> if(nc_enddef(ncid)) ERR;
>
> const char *data_in = "Test string.";
> if(nc_put_var_string(ncid, char_varid, &data_in)) ERR;
>
> char *data_out = NULL;
> if(nc_get_var_string(ncid, char_varid, &data_out)) ERR;
>
> std::cout << "Retrieved: " << data_out << std::endl;
> free(data_out);
>
> if(nc_close(ncid)) ERR;
> return 0;
> }
>
> Thanks,
>
> Alex
>
>
Ticket Details
===================
Ticket ID: DXE-930963
Department: Support netCDF
Priority: High
Status: Closed
===================
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