# usecases/c/UsesCase_MEDfield_14.c

    /*  This file is part of MED.
     *
     *  COPYRIGHT (C) 1999 - 2012  EDF R&D, CEA/DEN
     *  MED is free software: you can redistribute it and/or modify
     *  it under the terms of the GNU Lesser General Public License as published by
     *  the Free Software Foundation, either version 3 of the License, or
     *  (at your option) any later version.
     *
     *  MED is distributed in the hope that it will be useful,
     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     *  GNU Lesser General Public License for more details.
     *
     *  You should have received a copy of the GNU Lesser General Public License
     *  along with MED.  If not, see <http://www.gnu.org/licenses/>.
     */

    #include <med.h>
    #define MESGERR 1
    #include <med_utils.h>

    #include <string.h>

    #include <med.h>
    #define MESGERR 1
    #include <med_utils.h>

    #include <string.h>

    /*
     * Field use case 14 : read a field on nodes elements (generic approach) in a MED file
     */

    int main (int argc, char **argv) {
      med_idt fid;
      med_idt nfield, i, j;
      char meshname[MED_NAME_SIZE+1]="";
      med_bool localmesh;
      char fieldname[MED_NAME_SIZE+1]="";
      med_field_type fieldtype;
      char *componentname = NULL;
      char *componentunit = NULL;
      char dtunit[MED_SNAME_SIZE+1]="";
      med_float *values = NULL;
      med_int nstep, nvalues;
      med_int ncomponent;
      med_int csit, numit, numdt, it;
      med_float dt;
      med_geometry_type geotype;
      med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
      med_int nprofile, pit, profilesize;
      char profilename[MED_NAME_SIZE+1]="";
      med_int nintegrationpoint;
      char localizationname[MED_NAME_SIZE+1]="";
      int k;
      int ret=-1;

      /* open file */
      fid = MEDfileOpen("UsesCase_MEDfield_13.med",MED_ACC_RDONLY);
      if (fid < 0) {
        MESSAGE("ERROR : open file ...");
        goto ERROR;
      }

      /*
       * generic approach : how many fields in the file and identification
       * of each field.
       */
      if ((nfield = MEDnField(fid)) < 0) {
        MESSAGE("ERROR : How many fields in the file ...");
        goto ERROR;
      }

      /*
       * read values for each field
       */
      for (i=0; i<nfield; i++) {

        if ((ncomponent = MEDfieldnComponent(fid,i+1)) < 0) {
          MESSAGE("ERROR : number of field component ...");
          goto ERROR;
        }

        if ((componentname = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
          MESSAGE("ERROR : memory allocation ...");
          goto ERROR;
        }

        if ((componentunit = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
          MESSAGE("ERROR : memory allocation ...");
          goto ERROR;
        }

        if (MEDfieldInfo(fid, i+1, fieldname, meshname, &localmesh, &fieldtype,
                         componentname, componentunit, dtunit, &nstep) < 0) {
          MESSAGE("ERROR : Field info ...");
          free(componentname);
          free(componentunit);
          goto ERROR;
        }

        free(componentname);
        free(componentunit);

        /*
         * Read field values for each computing step
         */
        for (csit=0; csit<nstep; csit++) {

          if (MEDfieldComputingStepInfo(fid, fieldname, csit+1, &numdt, &numit, &dt) < 0) {
            MESSAGE("ERROR : Computing step info ...");
            goto ERROR;
          }

          /*
           * ... In our case, we suppose that the field values are only defined on nodes element ...
           */
          for (it=1; it<= MED_N_CELL_FIXED_GEO; it++) {

            geotype = geotypes[it];
            /*
             * How many profile for each geometry type ?
             */
            if ((nprofile = MEDfieldnProfile(fid, fieldname, numdt, numit, MED_NODE_ELEMENT, geotype,
                                             profilename, localizationname)) < 0) {
              MESSAGE("ERROR : read number of profile ");
              goto ERROR;
            }

            /*
             * Read values for each profile
             */
            for (pit=0; pit<nprofile; pit++) {

              if ((nvalues = MEDfieldnValueWithProfile(fid, fieldname, numdt, numit, MED_NODE_ELEMENT, geotype,
                                                       pit+1, MED_COMPACT_PFLMODE, profilename, &profilesize,
                                                       localizationname, &nintegrationpoint)) < 0) {
                MESSAGE("ERROR : read number of values with a profile ...");
                goto ERROR;
              }

              if (nvalues) {
                if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent*nintegrationpoint)) == NULL) {
                  MESSAGE("ERROR : memory allocation ...");
                  goto ERROR;
                }
                if (MEDfieldValueWithProfileRd(fid, fieldname, numdt, numit, MED_NODE_ELEMENT, geotype,
                                               MED_COMPACT_PFLMODE, profilename,
                                               MED_FULL_INTERLACE, MED_ALL_CONSTITUENT,
                                               (unsigned char*) values) < 0) {
                  MESSAGE("ERROR : read fields values for cells ...");
                  free(values);
                  goto ERROR;
                }
                free(values);
              }
            }
          }
        }
      }

      ret=0;
     ERROR:

      /* close file */
      if (MEDfileClose(fid) < 0) {
        MESSAGE("ERROR : close file ...");
        ret=-1;
      }

      return ret;
    }