[netcdfgroup] Windows crash accessing pathfinderAgg OPeNDAP dataset?

• To: "netcdfgroup@xxxxxxxxxxxxxxxx" <netcdfgroup@xxxxxxxxxxxxxxxx>
• Subject: [netcdfgroup] Windows crash accessing pathfinderAgg OPeNDAP dataset?
• From: Ellen Johnson <Ellen.Johnson@xxxxxxxxxxxxx>
• Date: Tue, 28 Apr 2015 21:07:19 +0000

Hello again,
  I just upgraded our netCDF version to 4.3.3.1, and am testing whether we 
still get a segmentation fault in Windows when using the MATLAB high-level 
ncinfo function to read the following OPeNDAP dataset:
    
http://data.nodc.noaa.gov/thredds/dodsC/testdata/pathfinderAgg/pathFinderV5.2_night.ncml
 I confirmed this still happens with 4.3.3.1 in MATLAB.  Note this does not 
happen in Linux or Mac, only Windows.
  I attempted to isolate the problem by writing a standalone C function that 
links to netCDF 4.3.3.1, bypassing MATLAB.
  I compiled the function in Linux using make, and Visual Studio 2012.
  In Linux, the program runs fine.  In Windows, it gets to the nc_close(ncid) 
line and then throws an unhandled exception.
  I copied the standalone program below.  Do you know if there is still a 
problem accessing this pathfinderAgg dataset in Windows?
  Thank you!
    Ellen
    Software Engineer
    Image and Scientific File Formats
    MathWorks

#include <netcdf.h>

static char* 
URL="http://data.nodc.noaa.gov/thredds/dodsC/testdata/pathfinderAgg/pathFinderV5.2_night.ncml";;

int
main()
{
     int ncid;
     int ncstatus;
     int lat_id;
     nc_type lat_type;
     int lat_ndims;
     int lat_dimids[NC_MAX_VAR_DIMS];
     int lat_natts;
     int format_p;
     float lat_data[4320];

     printf(" \n");
     printf("********************\n");
     printf("open URL %s\n",URL);
     printf(" \n");
     ncstatus = nc_open(URL, NC_NOWRITE, &ncid);
     if(ncstatus != NC_NOERR) {
         printf("Could not open: %s; server may be down; test ignored\n",URL);
         exit(0);
     }
     printf("status after open = %d\n", ncstatus);

     // get the format
     ncstatus = nc_inq_format(ncid, &format_p);
     printf("lat id = %d\n", format_p);

     // get varid for latitude
     ncstatus = nc_inq_varid(ncid,"lat",&lat_id);
     printf("status after inq lat id = %d\n", ncstatus);
     printf("lat id = %d\n", lat_id);

     ncstatus = nc_inq_var(ncid, lat_id, 0, &lat_type, &lat_ndims, lat_dimids, 
&lat_natts);
     printf("status after inq lat var = %d\n", ncstatus);
     printf("lat type = %d\n", lat_type);

     // extract the first latitude value
     ncstatus = nc_get_var_float(ncid, lat_id, &lat_data[0]);
     printf("status after get = %d\n", ncstatus);
     printf("my datum = %f\n", lat_data[0]);

     // This code works okay in Linux and Mac
     // Everything works okay up until here in Windows then an exception occurs
     ncstatus = nc_close(ncid);
     printf("status after close = %d\n", ncstatus);
     printf("End of test.\n\n");

     return 0;
}