MED fichier: usecases/c/UsesCase_MEDmesh_2.c

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usecases/c/UsesCase_MEDmesh_2.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 2 : read a 2D unstructured mesh with 15 nodes, 8 triangular cells, 4 triangular cells
*/
#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 *triaconnectivity = NULL;
med_int ntria3 = 0;
med_int *quadconnectivity = NULL;
med_int nquad4 = 0;
med_bool coordinatechangement;
med_bool geotransformation;
int i;
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;
}
/*
* ... 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_NO_GEOTYPE,
MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
&geotransformation)) < 0) {
MESSAGE("ERROR : number of nodes ...");
goto ERROR;
}
/*
* ... we know that we only have MED_TRIA3 and MED_QUAD4 in the mesh,
* a real code would check all MED geometry cell types ...
*/
/* read how many triangular cells in the mesh */
if ((ntria3 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL, MED_TRIA3,
MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
&geotransformation)) < 0) {
MESSAGE("ERROR : number of MED_TRIA3 ...");
goto ERROR;
}
/* read how many quadrangular cells in the mesh */
if ((nquad4 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL, MED_QUAD4,
MED_CONNECTIVITY, MED_NODAL, &coordinatechangement,
&geotransformation)) < 0) {
MESSAGE("ERROR : number of MED_QUAD4 ...");
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 ...");
goto ERROR;
}
/* read cells connectivity in the mesh */
if ((triaconnectivity = (med_int *) malloc(sizeof(med_int)*ntria3*3)) == NULL) {
MESSAGE("ERROR : memory allocation ...");
goto ERROR;
}
if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
MED_TRIA3, MED_NODAL, MED_FULL_INTERLACE, triaconnectivity) < 0) {
MESSAGE("ERROR : MED_TRIA3 connectivity ...");
goto ERROR;
}
if ((quadconnectivity = (med_int *) malloc(sizeof(med_int)*nquad4*4)) == NULL) {
MESSAGE("ERROR : memory allocation ...");
goto ERROR;
}
if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
MED_QUAD4, MED_NODAL, MED_FULL_INTERLACE, quadconnectivity) < 0) {
MESSAGE("ERROR : MED_QUAD4 connectivity ...");
goto ERROR;
}
/*
* ... we know that the family number of nodes and elements is 0, a real code would check ...
*/
ret = 0;
ERROR :
/* memory desallocation */
if (coordinates)
free(coordinates);
if (triaconnectivity)
free(triaconnectivity);
if (quadconnectivity)
free(quadconnectivity);
/* close MED file */
if (MEDfileClose(fid) < 0) {
MESSAGE("ERROR : close file");
ret = -1;
}
return ret;
}