usecases/c/UsesCase_MEDmesh_14.c
/* This file is part of MED.
*
* COPYRIGHT (C) 1999 - 2020 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/>.
*/
/*
* Use case 14 : read a 2D unstructured mesh with 2 polygons
*/
#include <med.h>
#define MESGERR 1
#include <med_utils.h>
#include <string.h>
int main (int argc, char **argv) {
med_idt fid;
const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
char meshdescription[MED_COMMENT_SIZE+1]="";
med_int meshdim;
med_int spacedim;
med_sorting_type sortingtype;
med_int nstep;
med_mesh_type meshtype;
med_axis_type axistype;
char axisname[2*MED_SNAME_SIZE+1]="";
char unitname[2*MED_SNAME_SIZE+1]="";
char dtunit[MED_SNAME_SIZE+1]="";
med_float *coordinates = NULL;
med_int nnodes = 0;
med_int npoly = 0;
med_int indexsize;
med_int *index = NULL;
med_int *connectivity = NULL;
med_int connectivitysize;
med_bool coordinatechangement;
med_bool geotransformation;
int i, k, ind1, ind2;
int ret=-1;
/* open MED file with READ ONLY access mode */
fid = MEDfileOpen("UsesCase_MEDmesh_13.med",MED_ACC_RDONLY);
if (fid < 0) {
MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
goto ERROR;
}
/*
* ... we know that the MED file has only one mesh,
* a real code would check ...
*/
/* read mesh informations : mesh dimension, space dimension ... */
if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
MESSAGE("ERROR : mesh info ...");
goto ERROR;
}
/* read how many nodes in the mesh */
if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_POINT1,
MED_COORDINATE, MED_NO_CMODE,&coordinatechangement, &geotransformation)) < 0)
{ MESSAGE("ERROR : number of nodes ...");
goto ERROR;
}
/*
* ... we know that we only have MED_POLYGON cells in the mesh,
* a real code would check all MED geometry cell types ...
*/
/* How many polygon in the mesh in nodal connectivity mode */
/* For the polygons, we get the size of array index */
if ((indexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
MED_CELL,MED_POLYGON,MED_INDEX_NODE,MED_NODAL,
&coordinatechangement, &geotransformation)) < 0)
{ MESSAGE("ERROR : read number of polygon ...");
goto ERROR;
}
npoly = indexsize-1;
/* how many nodes for the polygon connectivity ? */
if ((connectivitysize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
MED_CELL,MED_POLYGON,MED_CONNECTIVITY,MED_NODAL,
&coordinatechangement, &geotransformation)) < 0)
{ MESSAGE("ERROR : read connectivity size ...");
goto ERROR;
}
/* read mesh nodes coordinates */
if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
MESSAGE("ERROR : memory allocation ...");
goto ERROR;
}
if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE, coordinates) < 0)
{ MESSAGE("ERROR : nodes coordinates ...");
free(coordinates);
goto ERROR;
}
free(coordinates);
/* read polygons connectivity */
index = (med_int *) malloc(sizeof(med_int)*indexsize);
connectivity = (med_int *) malloc(sizeof(med_int)*connectivitysize);
if (MEDmeshPolygonRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL, MED_NODAL, index, connectivity) < 0)
{ MESSAGE("ERROR : read polygon connectivity ...");
free(index);
free(connectivity);
goto ERROR;
}
free(index);
free(connectivity);
/*
* ... we know that the family number of nodes and elements is 0, a real code would check ...
*/
ret=0;
ERROR:
/* close MED file */
if (MEDfileClose(fid) < 0) {
MESSAGE("ERROR : close file");
ret=-1;
}
return ret;
}
main
int main(int argc, char **argv)
Definition 3.0.8/test10.c:51
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition MEDfileClose.c:30
MEDfileOpen
MEDC_EXPORT med_idt MEDfileOpen(const char *const filename, const med_access_mode accessmode)
Ouverture d'un fichier MED.
Definition MEDfileOpen.c:42
MEDmeshNodeCoordinateRd
MEDC_EXPORT med_err MEDmeshNodeCoordinateRd(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_switch_mode switchmode, med_float *const coordinates)
Cette routine permet de lire dans un maillage le tableau des coordonnées des noeuds,...
Definition MEDmeshNodeCoordinateRd.c:37
MEDmeshnEntity
MEDC_EXPORT med_int MEDmeshnEntity(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_geometry_type geotype, const med_data_type datatype, const med_connectivity_mode cmode, med_bool *const changement, med_bool *const transformation)
Cette routine permet de lire le nombre d'entités dans un maillage pour une étape de calcul donnée.
Definition MEDmeshnEntity.c:44
MEDmeshPolygonRd
MEDC_EXPORT med_err MEDmeshPolygonRd(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_connectivity_mode cmode, med_int *const polyindex, med_int *const connectivity)
Cette routine permet la lecture des connectivités de polygones.
Definition MEDmeshPolygonRd.c:44
MEDmeshInfoByName
MEDC_EXPORT med_err MEDmeshInfoByName(const med_idt fid, const char *const meshname, med_int *const spacedim, med_int *const meshdim, med_mesh_type *const meshtype, char *const description, char *const dtunit, med_sorting_type *const sortingtype, med_int *const nstep, med_axis_type *const axistype, char *const axisname, char *const axisunit)
Cette routine permet de lire les informations relatives à un maillage en précisant son nom.
Definition MEDmeshInfoByName.c:42
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition med.h:81
MED_FULL_INTERLACE
@ MED_FULL_INTERLACE
Definition med.h:96
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition med.h:82
med_bool
med_bool
Definition med.h:260
MED_CONNECTIVITY
@ MED_CONNECTIVITY
Definition med.h:149
MED_COORDINATE
@ MED_COORDINATE
Definition med.h:149
MED_INDEX_NODE
@ MED_INDEX_NODE
Definition med.h:151
med_axis_type
med_axis_type
Definition med.h:258
med_sorting_type
med_sorting_type
Definition med.h:300
med_mesh_type
med_mesh_type
Definition med.h:131
MED_POLYGON
#define MED_POLYGON
Definition med.h:223
med_int
int med_int
Definition med.h:333
MED_NO_DT
#define MED_NO_DT
Definition med.h:311
MED_NO_IT
#define MED_NO_IT
Definition med.h:312
MED_NODE
@ MED_NODE
Definition med.h:143
MED_CELL
@ MED_CELL
Definition med.h:143
MED_POINT1
#define MED_POINT1
Definition med.h:198
med_float
double med_float
Definition med.h:327
MED_COMMENT_SIZE
#define MED_COMMENT_SIZE
Definition med.h:79
MED_ACC_RDONLY
@ MED_ACC_RDONLY
Definition med.h:120
med_idt
hid_t med_idt
Definition med.h:322
MED_NO_CMODE
@ MED_NO_CMODE
Definition med.h:255
MED_NODAL
@ MED_NODAL
Definition med.h:255
med.h
MESSAGE
#define MESSAGE(chaine)
Definition med_utils.h:324
med_utils.h