MED fichier
UsesCase_MEDmesh_2.c
Aller à la documentation de ce fichier.
1 /* This file is part of MED.
2  *
3  * COPYRIGHT (C) 1999 - 2021 EDF R&D, CEA/DEN
4  * MED is free software: you can redistribute it and/or modify
5  * it under the terms of the GNU Lesser General Public License as published by
6  * the Free Software Foundation, either version 3 of the License, or
7  * (at your option) any later version.
8  *
9  * MED is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public License
15  * along with MED. If not, see <http://www.gnu.org/licenses/>.
16  */
17 
18 /*
19  * Use case 2 : read a 2D unstructured mesh with 15 nodes, 8 triangular cells, 4 triangular cells
20  */
21 
22 #include <med.h>
23 #define MESGERR 1
24 #include <med_utils.h>
25 
26 #include <string.h>
27 
28 int main (int argc, char **argv) {
29  med_idt fid;
30  const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
31  char meshdescription[MED_COMMENT_SIZE+1];
32  med_int meshdim;
33  med_int spacedim;
34  med_sorting_type sortingtype;
35  med_int nstep;
36  med_mesh_type meshtype;
37  med_axis_type axistype;
38  char axisname[2*MED_SNAME_SIZE+1];
39  char unitname[2*MED_SNAME_SIZE+1];
40  char dtunit[MED_SNAME_SIZE+1];
41  med_float *coordinates = NULL;
42  med_int nnodes = 0;
43  med_int *triaconnectivity = NULL;
44  med_int ntria3 = 0;
45  med_int *quadconnectivity = NULL;
46  med_int nquad4 = 0;
47  med_bool coordinatechangement;
48  med_bool geotransformation;
49  int i;
50  int ret = -1;
51 
52  /* open MED file with READ ONLY access mode */
53  fid = MEDfileOpen("UsesCase_MEDmesh_1.med",MED_ACC_RDONLY);
54  if (fid < 0) {
55  MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
56  goto ERROR;
57  }
58 
59  /*
60  * ... we know that the MED file has only one mesh,
61  * a real code would check ...
62  */
63 
64  /* read mesh informations : mesh dimension, space dimension ... */
65  if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
66  dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
67  MESSAGE("ERROR : mesh info ...");
68  goto ERROR;
69  }
70 
71  /* read how many nodes in the mesh */
72  if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NO_GEOTYPE,
73  MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
74  &geotransformation)) < 0) {
75  MESSAGE("ERROR : number of nodes ...");
76  goto ERROR;
77  }
78 
79  /*
80  * ... we know that we only have MED_TRIA3 and MED_QUAD4 in the mesh,
81  * a real code would check all MED geometry cell types ...
82  */
83 
84  /* read how many triangular cells in the mesh */
85  if ((ntria3 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,MED_TRIA3,
86  MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
87  &geotransformation)) < 0) {
88  MESSAGE("ERROR : number of MED_TRIA3 ...");
89  goto ERROR;
90  }
91 
92  /* read how many quadrangular cells in the mesh */
93  if ((nquad4 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,MED_QUAD4,
94  MED_CONNECTIVITY, MED_NODAL, &coordinatechangement,
95  &geotransformation)) < 0) {
96  MESSAGE("ERROR : number of MED_QUAD4 ...");
97  goto ERROR;
98  }
99 
100 
101  /* read mesh nodes coordinates */
102  if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
103  MESSAGE("ERROR : memory allocation ...");
104  goto ERROR;
105  }
106 
108  coordinates) < 0) {
109  MESSAGE("ERROR : nodes coordinates ...");
110  goto ERROR;
111  }
112 
113  /* read cells connectivity in the mesh */
114  if ((triaconnectivity = (med_int *) malloc(sizeof(med_int)*ntria3*3)) == NULL) {
115  MESSAGE("ERROR : memory allocation ...");
116  goto ERROR;
117  }
119  MED_TRIA3, MED_NODAL, MED_FULL_INTERLACE, triaconnectivity) < 0) {
120  MESSAGE("ERROR : MED_TRIA3 connectivity ...");
121  goto ERROR;
122  }
123 
124  if ((quadconnectivity = (med_int *) malloc(sizeof(med_int)*nquad4*4)) == NULL) {
125  MESSAGE("ERROR : memory allocation ...");
126  goto ERROR;
127  }
129  MED_QUAD4, MED_NODAL, MED_FULL_INTERLACE, quadconnectivity) < 0) {
130  MESSAGE("ERROR : MED_QUAD4 connectivity ...");
131  goto ERROR;
132  }
133 
134  /*
135  * ... we know that the family number of nodes and elements is 0, a real code would check ...
136  */
137  ret = 0;
138  ERROR :
139 
140  /* memory desallocation */
141  if (coordinates)
142  free(coordinates);
143 
144  if (triaconnectivity)
145  free(triaconnectivity);
146 
147  if (quadconnectivity)
148  free(quadconnectivity);
149 
150  /* close MED file */
151  if (MEDfileClose(fid) < 0) {
152  MESSAGE("ERROR : close file");
153  ret = -1;
154  }
155 
156  return ret;
157 }
158 
MED_TRIA3
#define MED_TRIA3
Definition: med.h:203
MED_FULL_INTERLACE
Definition: med.h:96
MED_COMMENT_SIZE
#define MED_COMMENT_SIZE
Definition: med.h:79
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
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_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:82
MED_NODAL
Definition: med.h:255
MED_NO_GEOTYPE
#define MED_NO_GEOTYPE
Definition: med.h:232
med_idt
hid_t med_idt
Definition: med.h:331
MED_ACC_RDONLY
Definition: med.h:120
med_sorting_type
med_sorting_type
Definition: med.h:309
MED_NO_CMODE
Definition: med.h:255
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.h
med_bool
med_bool
Definition: med.h:260
med_float
double med_float
Definition: med.h:336
MED_NO_DT
#define MED_NO_DT
Definition: med.h:320
MED_CONNECTIVITY
Definition: med.h:149
MEDmeshElementConnectivityRd
MEDC_EXPORT med_err MEDmeshElementConnectivityRd(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_connectivity_mode cmode, const med_switch_mode switchmode, med_int *const connectivity)
Cette routine permet de lire dans un maillage le tableau des connectivités pour un type géométrique d...
Definition: MEDmeshElementConnectivityRd.c:40
MED_NODE
Definition: med.h:143
med_mesh_type
med_mesh_type
Definition: med.h:131
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
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
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_axis_type
med_axis_type
Definition: med.h:258
MED_NO_IT
#define MED_NO_IT
Definition: med.h:321
MED_COORDINATE
Definition: med.h:149
med_utils.h
MED_QUAD4
#define MED_QUAD4
Definition: med.h:204
main
int main(int argc, char **argv)
Definition: UsesCase_MEDmesh_2.c:28