usecases/c/UsesCase_MEDfield_3.c
#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_geometry_type geotype;
  med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
  int ret=-1;
  
  fid = MEDfileOpen("UsesCase_MEDfield_1.med",MED_ACC_RDONLY);
  if (fid < 0) {
    MESSAGE("ERROR : open file ...");
    goto ERROR;
  }
  
  if ((nfield = MEDnField(fid)) < 0) {
    MESSAGE("ERROR : How many fields in the file ...");
    goto ERROR;
  }
  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);
    
    
    
    if ((nvalues = MEDfieldnValue(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NONE)) < 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, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NONE,
                          MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, (unsigned char*) values) < 0) {
        MESSAGE("ERROR : read fields values defined on vertices ...");
        free(values);
        goto ERROR;
      }
      free(values);
    }
    
    for (j=1; j<=MED_N_CELL_FIXED_GEO; j++) {
      geotype = geotypes[j];
  
      if ((nvalues = MEDfieldnValue(fid, fieldname, MED_NO_DT, MED_NO_IT, 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, MED_NO_DT, MED_NO_IT, 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:
  
  if (MEDfileClose(fid) < 0) {
    MESSAGE("ERROR : close file ...");             
    ret=-1; 
  } 
  
  return ret;
}