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[netCDF #QIC-858208]: Need help in netcdf4

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  • Subject: [netCDF #QIC-858208]: Need help in netcdf4
  • Date: Thu, 16 Jul 2015 11:30:08 -0600
Hello,

I'm not sure why exactly your program is crashing; it could be for any number 
of reasons.  Using a debugger like gdb would help tell you exactly at which 
line the program is core dumping, and why.

Unfortunately the code snippet you provide does not give enough information; 
for example, I don't see how dsec is instantiated.  It's possible that it has 
been improperly declared, for example.  

USE_NETCDF4 is defined during the 'configure' process, when the script checks 
to see if you are compiling netCDF with netCDF4 support.  It is only defined 
when building the library, however; you should not need to define it explicitly.

-Ward

> Dear Sir,
> 
> I'm reading header of satellite data (netcdf4  format ) in a c programm
> 
> 
> nc_open ( "
> OR_HFD-020-B14-M1C07-T073_GH8_s2015197135000_c2015197140528.nc",
> NC_NOWRITE, &ncid );
> 
> /*
> *      Get the x and y dimensions of the image.
> */
> nc_inq_dimlen ( ncid, 0, &jy );
> nc_inq_dimlen ( ncid, 1, &jx );
> (I get jy = 550; jx = 688  match the result of ncdump)
> 
> 
> When I tried:
> 
> /*
> *      Get the date/time. It is stored as the number of seconds
> *      since 00:00:00 UTC, January 1, 1970.
> */
> nc_get_var1_double ( ncid, 1, 0, &dsec );
> 
> I got:
> Segmentation fault (core dumped)
> 
> Do you know the reason?
> How do I make sure that I define USE_NETCDF4 so that: it can excutes:
> 
> if(memtype >= NC_FIRSTUSERTYPEID) memtype = NC_NAT;
> 
> 
> ***********************************************************************************
> 
> 
> #ifdef USE_NETCDF4
> if(memtype >= NC_FIRSTUSERTYPEID) memtype = NC_NAT;
> #endif
> 
> *************************************************************************************
> from netcdf-4.3.3.1/libdispatch/dvarget.c
> 
> 
> 
> Thank you for your help!
> 
> Shucai
> 
> 
> 
> 

Ticket Details
===================
Ticket ID: QIC-858208
Department: Support netCDF
Priority: Normal
Status: Closed