usecases/c/UsesCase_MEDfield_6.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 6 : read a field (generic approach) with computing steps
 */

#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>

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, meshnumit, meshnumdt, it;
  med_float dt;
  med_geometry_type geotype;
  med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
  int k;
  int ret=-1;

  /* open file */
  fid = MEDfileOpen("UsesCase_MEDfield_4.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 (MEDfieldComputingStepMeshInfo(fid, fieldname, csit+1, &numdt, &numit, &dt, 
                                        &meshnumdt, &meshnumit) < 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];
        if ((nvalues = MEDfieldnValue(fid, fieldname, numdt, numit, MED_CELL, geotype)) < 0) {
          MESSAGE("ERROR : read number of values ...");
          goto ERROR;
        } 
        if (nvalues) {
          if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent)) == NULL) {
            MESSAGE("ERROR : memory allocation ...");
          goto ERROR;
          }
          if (MEDfieldValueRd(fid, fieldname, numdt, numit, MED_CELL, geotype,
                              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