# UsesCase_MEDfield_5.c

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    00001 /*  This file is part of MED.
    00002  *
    00003  *  COPYRIGHT (C) 1999 - 2011  EDF R&D, CEA/DEN
    00004  *  MED is free software: you can redistribute it and/or modify
    00005  *  it under the terms of the GNU Lesser General Public License as published by
    00006  *  the Free Software Foundation, either version 3 of the License, or
    00007  *  (at your option) any later version.
    00008  *
    00009  *  MED is distributed in the hope that it will be useful,
    00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
    00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00012  *  GNU Lesser General Public License for more details.
    00013  *
    00014  *  You should have received a copy of the GNU Lesser General Public License
    00015  *  along with MED.  If not, see <http://www.gnu.org/licenses/>.
    00016  */
    00017
    00018 /*
    00019  * Field use case 5 : read a field with following with computing steps
    00020  */
    00021
    00022 #include <med.h>
    00023 #define MESGERR 1
    00024 #include <med_utils.h>
    00025
    00026 #include <string.h>
    00027
    00028 int main (int argc, char **argv) {
    00029   med_idt fid;
    00030   char meshname[MED_NAME_SIZE+1]="";
    00031   med_bool localmesh;
    00032   const char fieldname[MED_NAME_SIZE+1] = "TEMPERATURE_FIELD";
    00033   med_field_type fieldtype;
    00034   char componentname[MED_SNAME_SIZE+1]="";
    00035   char componentunit[MED_SNAME_SIZE+1]="";
    00036   char dtunit[MED_SNAME_SIZE+1]="";
    00037   med_float *values = NULL;
    00038   med_int nstep, nvalues;
    00039   med_int ncomponent = 1;
    00040   med_int csit, numit, numdt, meshnumit, meshnumdt, it;
    00041   med_float dt;
    00042   med_geometry_type geotype;
    00043   med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
    00044   int ret=-1;
    00045
    00046   /* open file */
    00047   fid = MEDfileOpen("UsesCase_MEDfield_4.med",MED_ACC_RDONLY);
    00048   if (fid < 0) {
    00049     MESSAGE("ERROR : open file ...");
    00050     goto ERROR;
    00051   }
    00052
    00053   /*
    00054    * ... we know that the MED file has only one field with one component ,
    00055    * a real code working would check ...
    00056    */
    00057
    00058   /*
    00059    * if you know the field name, direct access to field informations
    00060    */
    00061   if (MEDfieldInfoByName(fid, fieldname, meshname, &localmesh, &fieldtype,
    00062                          componentname, componentunit, dtunit, &nstep) < 0) {
    00063     MESSAGE("ERROR : Field info by name ...");
    00064     goto ERROR;
    00065   }
    00066
    00067   /*
    00068    * Read field values for each computing step
    00069    */
    00070   for (csit=0; csit<nstep; csit++) {
    00071
    00072     if (MEDfieldComputingStepMeshInfo(fid, fieldname, csit+1, &numdt, &numit, &dt,
    00073                                       &meshnumdt, &meshnumit) < 0) {
    00074       MESSAGE("ERROR : Computing step info ...");
    00075       goto ERROR;
    00076     }
    00077
    00078   /*
    00079    * ... In our case, we suppose that the field values are only defined on cells ...
    00080    */
    00081     for (it=1; it<=MED_N_CELL_FIXED_GEO; it++) {
    00082
    00083       geotype = geotypes[it];
    00084
    00085       if ((nvalues = MEDfieldnValue(fid, fieldname, numdt, numit, MED_CELL, geotype)) < 0) {
    00086         MESSAGE("ERROR : read number of values ...");
    00087         goto ERROR;
    00088       }
    00089
    00090       if (nvalues) {
    00091         if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent)) == NULL) {
    00092           MESSAGE("ERROR : memory allocation ...");
    00093           goto ERROR;
    00094         }
    00095         if (MEDfieldValueRd(fid, fieldname, numdt, numit, MED_CELL, geotype,
    00096                             MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, (unsigned char*) values) < 0) {
    00097           MESSAGE("ERROR : read fields values for cells ...");
    00098           free(values);
    00099           goto ERROR;
    00100         }
    00101         free(values);
    00102       }
    00103     }
    00104   }
    00105
    00106   ret=0;
    00107  ERROR:
    00108
    00109   /* close file */
    00110   if (MEDfileClose(fid) < 0) {
    00111     MESSAGE("ERROR : close file ...");
    00112     ret=-1;
    00113   }
    00114
    00115   return ret;
    00116 }