MED fichier: usecases/c/UsesCase_MEDfield_5.c

MED fichier

usecases/c/UsesCase_MEDfield_5.c
/* This file is part of MED.
*
* COPYRIGHT (C) 1999 - 2021 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 5 : read a field with following with computing steps
*/
#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, meshnumit, meshnumdt, it;
med_float dt;
med_geometry_type geotype;
med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
int ret=-1;
/* open file */
fid = MEDfileOpen("UsesCase_MEDfield_4.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 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 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;
}
MED_FULL_INTERLACE
Definition: med.h:96
MEDfileOpen
MEDC_EXPORT med_idt MEDfileOpen(const char *const filename, const med_access_mode accessmode)
Ouverture d'un fichier MED.
Definition: MEDfileOpen.c:42
med_geometry_type
int med_geometry_type
Definition: med.h:194
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:82
med_idt
hid_t med_idt
Definition: med.h:331
MED_ACC_RDONLY
Definition: med.h:120
MED_CELL
Definition: med.h:143
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
med_int
int med_int
Definition: med.h:342
med_field_type
med_field_type
Definition: med.h:165
MEDfieldValueRd
MEDC_EXPORT med_err MEDfieldValueRd(const med_idt fid, const char *const fieldname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_geometry_type geotype, const med_switch_mode switchmode, const med_int componentselect, unsigned char *const value)
Cette fonction permet de lire les valeurs d'un champ définies sur des entités d'un maillage pour une ...
Definition: MEDfieldValueRd.c:44
MED_GET_CELL_GEOMETRY_TYPE
med_geometry_type MED_GET_CELL_GEOMETRY_TYPE[MED_N_CELL_FIXED_GEO+2]
Definition: MEDiterators.c:55
med.h
med_bool
med_bool
Definition: med.h:260
med_float
double med_float
Definition: med.h:336
MEDfieldInfoByName
MEDC_EXPORT med_err MEDfieldInfoByName(const med_idt fid, const char *const fieldname, char *const meshname, med_bool *const localmesh, med_field_type *const fieldtype, char *const componentname, char *const componentunit, char *const dtunit, med_int *const ncstp)
Cette fonction permet de lire les informations concernant le champ de nom fieldname.
Definition: MEDfieldInfoByName.c:39
MEDfieldComputingStepMeshInfo
MEDC_EXPORT med_err MEDfieldComputingStepMeshInfo(const med_idt fid, const char *const fieldname, const int csit, med_int *const numdt, med_int *const numit, med_float *const dt, med_int *const meshnumdt, med_int *const meshnumit)
Cette fonction permet de lire les informations caractérisant une étape de calcul : numéro de pas de t...
Definition: MEDfieldComputingStepMeshInfo.c:39
MED_N_CELL_FIXED_GEO
#define MED_N_CELL_FIXED_GEO
Definition: med.h:239
MEDfieldnValue
MEDC_EXPORT med_int MEDfieldnValue(const med_idt fid, const char *const fieldname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_geometry_type geotype)
Cette fonction permet de lire le nombre de valeurs dans un champ pour une étape de calcul,...
Definition: MEDfieldnValue.c:38
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition: med.h:81
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition: MEDfileClose.c:30
MED_ALL_CONSTITUENT
#define MED_ALL_CONSTITUENT
Definition: med.h:299
main
int main(int argc, char **argv)
Definition: 3.0.8/test10.c:50
med_utils.h