usecases/c/UsesCase_MEDfield_11.c

/*  This file is part of MED.
 *
 *  COPYRIGHT (C) 1999 - 2015  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/>.
 */

/* 
 * Field use case 11 : read a field in a MED file with computing steps,
 *                     profiles, integration points, interpolation families
 */

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

#include <string.h>

int main (int argc, char **argv) {
  med_idt fid;
  char meshname[MED_NAME_SIZE+1]="";
  med_bool localmesh;
  const char fieldname[MED_NAME_SIZE+1] = "TEMPERATURE_FIELD";
  med_field_type fieldtype;
  char componentname[MED_SNAME_SIZE+1]="";
  char componentunit[MED_SNAME_SIZE+1]="";
  char dtunit[MED_SNAME_SIZE+1]="";
  med_float *values = NULL;
  med_int nstep, nvalues;
  med_int ncomponent = 1;
  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]="";
  med_int ninterp=0;
  char interpname[MED_NAME_SIZE+1]="";
  int ret=-1;

  /* open file */
  fid = MEDfileOpen("UsesCase_MEDfield_10.med",MED_ACC_RDONLY);
  if (fid < 0) {
    MESSAGE("ERROR : open file ...");
    goto ERROR;
  }

  /* 
   * ... we know that the MED file has only one field with one component , 
   * a real code working would check ... 
   */

  /*
   * if you know the field name, direct access to field informations
   */
  if (MEDfieldInfoByName(fid, fieldname, meshname, &localmesh, &fieldtype,
                         componentname, componentunit, dtunit, &nstep) < 0) {
    MESSAGE("ERROR : Field info by name ...");
    goto ERROR;
  }
  
  /* 
   * Read how many interpolation family name for the field ?  
   */
  if ((ninterp = MEDfieldnInterp(fid, fieldname)) < 0) {
    MESSAGE("ERROR : Read how many interpolation functions for the field ...");
    goto ERROR;
  }
  /* - Read each interlolation family name 
   * - The way to read an interploation family and it's basis functions 
   *  is described in UsesCase_MEDinterp_2 and UsesCase_MEDinterp_3 uses case
   */
  for (it=0; it<ninterp; it++) {
    if (MEDfieldInterpInfo(fid,fieldname,it+1,interpname) < 0) {
      MESSAGE("ERROR : read interpolation family name ...");
      goto ERROR;
    }
  }

  /*
   * 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 cells ... 
   */
    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_CELL, 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_CELL, 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_CELL, 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;
}

Généré le Thu Oct 8 14:26:16 2015 pour MED fichier par  doxygen 1.6.1