Open a DAF for subsequent read requests. 

   DAF 

   Variable  I/O  Description 
   --------  ---  -------------------------------------------------- 
   fname      I   Name of DAF to be opened. 
   handle     O   Handle assigned to DAF. 

   fname       is the file name of a DAF to be opened for read 
               access. 

   handle      is the file handle associated with the file. This 
               handle is used to identify the file in subsequent 
               calls to other DAF routines. 

  None. 

   Most DAFs require only read access. If you do not need to 
   change the contents of a file, you should open it with dafopr_c. 

   In the following code fragment, dafopr_c is used to open a file, 
   which is then searched for DAFs containing data for a particular 
   object. 

      #include "SpiceUsr.h"
           .
           .
           .
      dafopr_c ( fname, &handle ); 
      dafbfs_c ( handle );

      daffna_c ( &found );

      while ( found ) 
      {
         dafgs_c ( sum );
         dafus_c ( sum, ND, NI, dc, ic );

         if ( ic[0] == target_object ) 
         { 
            . 
            . 
            . 
         }

         daffna_c ( &found );
      }

   None. 

   1) If the specified file has already been opened for read 
      access, the handle already associated with the file is 
      returned. 

   2) If the specified file has already been opened for write 
      access, the error SPICE(DAFRWCONFLICT) is signaled. 

   3) If the specified file has already been opened by a non-DAF 
      routine, the error SPICE(DAFIMPROPOPEN) is signaled. 

   4) If the specified file cannot be opened without exceeding 
      the maximum number of files, the error SPICE(DAFFTFULL) 
      is signaled. 

   5) If (for some reason) the file cannot be opened properly, 
      the error SPICE(DAFOPENFAIL) is signaled. 

   6) If the attempt to read the file's ID word fails, the error 
      SPICE(FILEREADFAILED) will be signaled. 

   7) If the specified file is not a DAF file, as indicated by the 
      file's ID word, the error SPICE(NOTADAFFILE) is signaled. 

   8) If no logical units are available, the error will be 
      signaled by routines called by this routine. 

   9) If the file does not exist, the error SPICE(FILEDOESNOTEXIST) 
      is signaled. 

  10) If the INQUIRE fails, the error SPICE(INQUIREFAILED) 
      is signaled. 

  11) If the file record cannot (for some reason) be read, 
      the error SPICE(DAFFRNOTFOUND) is signaled. 

  12) If the file name is blank, the error SPICE(BLANKFILENAME) 
      is signaled. 

   See argument fname. 

   N.J. Bachman    (JPL) 
   K.R. Gehringer  (JPL) 
   J.M. Lynch      (JPL) 
   W.L. Taber      (JPL) 
   I.M. Underwood  (JPL) 

   NAIF Document 167.0, "Double Precision Array Files (DAF) 
   Specification and User's Guide" 

   -CSPICE Version 1.0.0, 01-AUG-1999 (NJB) (KRG) (JML) (WLT) (IMU)

   open daf for read