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UsesCase_MEDmesh_5.c
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1 /* This file is part of MED.
2  *
3  * COPYRIGHT (C) 1999 - 2023 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  * Mesh Use case 5 : read a 2D structured mesh
20  * 5x3 cartesian grid
21  *
22  */
23 
24 #include <med.h>
25 #define MESGERR 1
26 #include <med_utils.h>
27 
28 #include <string.h>
29 
30 int main (int argc, char **argv) {
31  med_idt fid;
32  const char meshname[MED_NAME_SIZE+1]="2D structured mesh";
33  med_int spacedim;
34  med_int meshdim;
35  char meshdescription[MED_COMMENT_SIZE+1];
36  char axisname[2*MED_SNAME_SIZE+1];
37  char unitname[2*MED_SNAME_SIZE+1];
38  char dtunit[MED_SNAME_SIZE+1];
39  med_mesh_type meshtype;
40  med_axis_type axistype;
41  med_grid_type gridtype;
42  med_int axis, size ;
43  med_float *cooXaxis = NULL;
44  med_float *cooYaxis = NULL;
45  med_bool coordinatechangement;
46  med_bool geotransformation;
47  med_int nstep;
48  med_sorting_type sortingtype;
49  int j;
50  int ret=-1;
51  int ncell=0;
52  char *cellsname=NULL;
53 
54  /* open MED file */
55  fid = MEDfileOpen("UsesCase_MEDmesh_4.med",MED_ACC_RDONLY);
56  if (fid < 0) {
57  MESSAGE("ERROR : open file ...");
58  goto ERROR;
59  }
60 
61  /* read mesh informations : meshname, mesh dimension, space dimension ... */
62  if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
63  dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
64  MESSAGE("ERROR : mesh info ...");
65  goto ERROR;
66  }
67 
68  /* read the grid type : MED_CARTESIAN_GRID or MED_CURVILINEAR_GRID */
69  if (MEDmeshGridTypeRd(fid, meshname, &gridtype) < 0) {
70  MESSAGE("ERROR : read grid type ...");
71  }
72 
73  /*
74  * ... we know that the mesh is a cartesian grid,
75  * a real code would check ...
76  */
77 
78  /* read the axis coordinates (MED_CARTESIAN coordinates system */
79  /* X */
80  axis = 1;
81  if ((size = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT,
83  &coordinatechangement, &geotransformation)) < 0) {
84  MESSAGE("ERROR : number of coordinates on X axis ...");
85  goto ERROR;
86  }
87  ncell = size-1;
88 
89  if ((cooXaxis = (med_float *) malloc(sizeof(med_float)*size)) == NULL) {
90  MESSAGE("ERROR : memory allocation ...");
91  goto ERROR;
92  }
94  axis, cooXaxis) < 0) {
95  MESSAGE("ERROR : read axis X coordinates ...");
96  free(cooXaxis);
97  goto ERROR;
98  }
99 
100  free(cooXaxis);
101 
102  /* Y */
103  axis = 2;
104  if ((size = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT,
106  &coordinatechangement, &geotransformation)) < 0) {
107  MESSAGE("ERROR : number of coordinates on Y axis ...");
108  goto ERROR;
109  }
110  ncell = ncell * (size-1);
111 
112  if ((cooYaxis = (med_float *) malloc(sizeof(med_float)*size)) == NULL) {
113  MESSAGE("ERROR : memory allocation ...");
114  goto ERROR;
115  }
117  axis, cooYaxis) < 0) {
118  MESSAGE("ERROR : read axis Y coordinates ...");
119  free(cooYaxis);
120  goto ERROR;
121  }
122 
123  free(cooYaxis);
124 
125  /* read cells name */
126 
127  cellsname = (char *) malloc((sizeof(char))*ncell*MED_SNAME_SIZE+1);
128  if (MEDmeshEntityNameRd(fid, meshname, MED_NO_DT, MED_NO_IT,
129  MED_CELL, MED_QUAD4, cellsname) < 0) {
130  MESSAGE("ERROR : read cells name ...");
131  free(cellsname);
132  goto ERROR;
133  }
134  free(cellsname);
135 
136  ret=0;
137  ERROR:
138 
139  /* close MED file */
140  if (MEDfileClose(fid) < 0) {
141  MESSAGE("ERROR : close file ...");
142  ret = -1;
143  }
144 
145  return ret;
146 }
MED_ACC_RDONLY
Definition: med.h:122
MED_COMMENT_SIZE
#define MED_COMMENT_SIZE
Definition: med.h:81
med_grid_type
med_grid_type
Definition: med.h:139
MED_COORDINATE_AXIS1
Definition: med.h:152
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:84
med_idt
hid_t med_idt
Definition: med.h:333
MEDmeshGridIndexCoordinateRd
MEDC_EXPORT med_err MEDmeshGridIndexCoordinateRd(const med_idt fid, const char *const meshname, const med_int numdt, const med_int numit, const med_int axis, med_float *const gridindex)
Cette routine permet la lecture des coordonnées des noeuds d'un maillage structuré selon un axe du re...
Definition: MEDmeshGridIndexCoordinateRd.c:39
MEDmeshEntityNameRd
MEDC_EXPORT med_err MEDmeshEntityNameRd(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, char *const name)
Cette routine permet de lire les noms d'un type d'entité d'un maillage.
Definition: MEDmeshEntityNameRd.c:38
med_sorting_type
med_sorting_type
Definition: med.h:311
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
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_int
int med_int
Definition: med.h:344
med_bool
med_bool
Definition: med.h:262
MED_COORDINATE_AXIS2
Definition: med.h:152
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
med_float
double med_float
Definition: med.h:338
MED_NO_CMODE
Definition: med.h:257
MED_NO_DT
#define MED_NO_DT
Definition: med.h:322
MED_NONE
#define MED_NONE
Definition: med.h:233
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition: MEDfileClose.c:30
med_mesh_type
med_mesh_type
Definition: med.h:133
MED_CELL
Definition: med.h:145
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition: med.h:83
MEDmeshGridTypeRd
MEDC_EXPORT med_err MEDmeshGridTypeRd(const med_idt fid, const char *const meshname, med_grid_type *const gridtype)
Cette routine permet de lire le type d'un maillage structuré (MED_STRUCTURED_MESH).
Definition: MEDmeshGridTypeRd.c:36
med_utils.h
MED_NODE
Definition: med.h:145
med_axis_type
med_axis_type
Definition: med.h:260
med.h
MED_NO_IT
#define MED_NO_IT
Definition: med.h:323
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_QUAD4
#define MED_QUAD4
Definition: med.h:206
main
int main(int argc, char **argv)
Definition: UsesCase_MEDmesh_5.c:30