Awesome!
Thanks for cluing me in.
I was indeed not setting the file type, which i'm now doing in nc_create() by
nc_create( outfile, NC_NOCLOBBER | NC_NETCDF4, &ncid );
So i no longer get kicked out with error -45.
However, i am now segfaulting inside the nc_put_att_string() call,
where it is apparently invoking strlen() (per gdb).
So i wonder if there's another piece of setup that i am missing.
Here's a complete program which illustrates the error (the malloc
business at the top is to make sure that the string storage i pass in
does not get optimized away or anything hokey like that):
#include <stdlib.h>
#include <stdio.h>
#include <netcdf.h>
#include <string.h>
char* copy_string( const char* s ) {
char* new_str = malloc( strlen(s) + 1);
strcpy( new_str, s );
return new;
}
int main(int argc,char** argv ) {
char* outfile = "deleteme.nc";
int ncid;
int status = nc_create( outfile, NC_NOCLOBBER | NC_NETCDF4, &ncid );
if ( status ) {
fprintf(stderr,"Could not create `%s'; failed with status %d: %s\n",
outfile, status, nc_strerror( status ) );
return 1;
}
const char* key = copy_string( "my-key" );
const char* val = copy_string( "my value" );
status = nc_put_att_string( ncid, NC_GLOBAL, key, strlen(val), &val );
if ( status ) {
fprintf(stderr,
"Failed on attempt to add string metadata; status %d: %s.\n",
status, nc_strerror( status ) );
return 2;
}
status = nc_close( ncid );
if ( status ) {
fprintf(stderr,"Failed on attempt to close %s; error %d: %s.\n",
outfile, status, nc_strerror( status ) );
return 3;
}
return 0;
}
If there's anything obvious wrong with this, please let me know, or if
you have any suggestions for debugging, please let me know, and TIA!
And thanks again for your earlier remark about the file type, which i
would not have guessed.
dan
On Wed, Nov 1, 2017 at 8:59 AM, dmh@xxxxxxxx <dmh@xxxxxxxx> wrote:
> Are you trying to create a netcdf-3 file, which does not
> support string type.
> =Dennis Heimbigner
> Unidata
>
>
> On 11/1/2017 1:15 AM, Dan Hitt wrote:
>>
>> Hi,
>>
>> I installed netcdf on a debian box using the the usual package means.
>>
>> I'm trying to assign some global string metadata in a file that i
>> create, successfully, with nc_create().
>>
>> My statement to assign the metadata looks like this:
>> int status =
>> nc_put_att_string( ncid, NC_GLOBAL, key, strlen( value ), &value );
>> where key and value both have declaration const char*.
>>
>> This compiles without error or warning, and i believe the values i'm
>> passing in are innocuous.
>>
>> Nevertheless, at runtime, i get a return status of -45, which
>> nc_strerror() reports as
>> NetCDF: Not a valid data type or _FillValue type mismatch.
>>
>> Am i missing some piece of setup that i need to do (besides getting
>> the ncid for the file)?
>>
>> This is my first call on the library after creating the file, so
>> presumably my ncid for the file couldn't have gotten too messed up
>> yet.
>>
>> TIA for any clues, or pointers to the manual, or any other advice.
>>
>> dan
>>
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>
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