MED fichier: usecases/c/UsesCase_MEDmesh_3.c

MED fichier

- Documentation MED
- Guides d'utilisation
- Guides de référence

usecases/c/UsesCase_MEDmesh_3.c
/* This file is part of MED.
*
* COPYRIGHT (C) 1999 - 2019 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 3 : read an unstructured mesh : generic approach
*/
#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]="";
char meshdescription[MED_COMMENT_SIZE+1]="";
med_int meshdim=0;
med_int spacedim=0;
med_sorting_type sortingtype;
med_int nstep;
med_mesh_type meshtype;
med_axis_type axistype;
char *axisname="";
char *unitname="";
char dtunit[MED_SNAME_SIZE+1]="";
med_float *coordinates = NULL;
med_int nnodes = 0;
med_int ngeo = 0;
med_int nelt=0;
med_int *connectivity = NULL;
med_bool coordinatechangement;
med_bool geotransformation;
med_int i, j, it, nmesh;
med_geometry_type geotype;
med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
char geotypename[MED_NAME_SIZE+1];
int ret=-1;
/* open MED file with READ ONLY access mode */
fid = MEDfileOpen("UsesCase_MEDmesh_1.med",MED_ACC_RDONLY);
if (fid < 0) {
MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
goto ERROR;
}
/* read how many mesh in the file */
if ((nmesh = MEDnMesh(fid)) < 0) {
MESSAGE("ERROR : read how many mesh ...");
goto ERROR;
}
for (i=0;i<nmesh;i++) {
/* read computation space dimension */
if ((spacedim = MEDmeshnAxis(fid, i+1)) < 0) {
MESSAGE("ERROR : read computation space dimension ...");
goto ERROR;
}
/* memory allocation */
if ((axisname = (char*) malloc(MED_SNAME_SIZE*spacedim+1)) == NULL) {
MESSAGE("ERROR : memory allocation ...");
goto ERROR;
}
if ((unitname = (char*) malloc(MED_SNAME_SIZE*spacedim+1)) == NULL) {
MESSAGE("ERROR : memory allocation ...");
goto ERROR;
}
/* read mesh informations : meshname, mesh dimension, mesh type ... */
if (MEDmeshInfo(fid, i+1, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
MESSAGE("ERROR : mesh info ...");
free(axisname); free(unitname);
goto ERROR;
}
free(axisname);
free(unitname);
/* read how many nodes in the mesh */
if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NO_GEOTYPE,
MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
&geotransformation)) < 0) {
MESSAGE("ERROR : number of nodes ...");
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;
}
if (coordinates)
free(coordinates);
/* read number of geometrical types for cells */
if ((ngeo = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL, MED_GEO_ALL,
MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
&geotransformation)) < 0) {
MESSAGE("ERROR : number of geo type ...");
ISCRUTE(geotype);
goto ERROR;
}
for (it=1; it<=ngeo; it++) {
/* get geometry type */
if (MEDmeshEntityInfo(fid, meshname, MED_NO_DT, MED_NO_IT,MED_CELL,it,
geotypename,&geotype) < 0) {
MESSAGE("ERROR : get geo type ...");
ISCRUTE(it);
goto ERROR;
}
/* how many cells of type geotype ? */
if ((nelt = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,geotype,
MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
&geotransformation)) < 0) {
MESSAGE("ERROR : number of cell ...");
goto ERROR;
}
/* read cells connectivity in the mesh */
if ((connectivity = (med_int *) malloc(sizeof(med_int)*nelt*(geotype%100))) == NULL) {
MESSAGE("ERROR : memory allocation ...");
goto ERROR;
}
if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
geotype, MED_NODAL, MED_FULL_INTERLACE, connectivity) < 0) {
MESSAGE("ERROR : cell connectivity ...");
ISCRUTE(geotype);
free(connectivity);
goto ERROR;
}
/* memory deallocation */
if (connectivity) {
free(connectivity);
connectivity = NULL;
}
}
}
/*
* ... 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;
}