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UsesCase_MEDfield_6.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  * Field use case 6 : read a field (generic approach) with computing steps
20  */
21 
22 #include <med.h>
23 #define MESGERR 1
24 #include <med_utils.h>
25 
26 #include <string.h>
27 
28 #include <med.h>
29 #define MESGERR 1
30 #include <med_utils.h>
31 
32 #include <string.h>
33 
34 int main (int argc, char **argv) {
35  med_idt fid;
36  med_idt nfield, i, j;
37  char meshname[MED_NAME_SIZE+1]="";
38  med_bool localmesh;
39  char fieldname[MED_NAME_SIZE+1]="";
40  med_field_type fieldtype;
41  char *componentname = NULL;
42  char *componentunit = NULL;
43  char dtunit[MED_SNAME_SIZE+1]="";
44  med_float *values = NULL;
45  med_int nstep, nvalues;
46  med_int ncomponent;
47  med_int csit, numit, numdt, meshnumit, meshnumdt, it;
48  med_float dt;
49  med_geometry_type geotype;
51  int k;
52  int ret=-1;
53 
54  /* open file */
55  fid = MEDfileOpen("UsesCase_MEDfield_4.med",MED_ACC_RDONLY);
56  if (fid < 0) {
57  MESSAGE("ERROR : open file ...");
58  goto ERROR;
59  }
60 
61  /*
62  * generic approach : how many fields in the file and identification
63  * of each field.
64  */
65  if ((nfield = MEDnField(fid)) < 0) {
66  MESSAGE("ERROR : How many fields in the file ...");
67  goto ERROR;
68  }
69 
70  /*
71  * read values for each field
72  */
73  for (i=0; i<nfield; i++) {
74 
75  if ((ncomponent = MEDfieldnComponent(fid,i+1)) < 0) {
76  MESSAGE("ERROR : number of field component ...");
77  goto ERROR;
78  }
79 
80  if ((componentname = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
81  MESSAGE("ERROR : memory allocation ...");
82  goto ERROR;
83  }
84 
85  if ((componentunit = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
86  MESSAGE("ERROR : memory allocation ...");
87  goto ERROR;
88  }
89 
90  if (MEDfieldInfo(fid, i+1, fieldname, meshname, &localmesh, &fieldtype,
91  componentname, componentunit, dtunit, &nstep) < 0) {
92  MESSAGE("ERROR : Field info ...");
93  free(componentname);
94  free(componentunit);
95  goto ERROR;
96  }
97  free(componentname);
98  free(componentunit);
99 
100  /*
101  * Read field values for each computing step
102  */
103  for (csit=0; csit<nstep; csit++) {
104 
105  if (MEDfieldComputingStepMeshInfo(fid, fieldname, csit+1, &numdt, &numit, &dt,
106  &meshnumdt, &meshnumit) < 0) {
107  MESSAGE("ERROR : Computing step info ...");
108  goto ERROR;
109  }
110 
111  /*
112  * ... In our case, we suppose that the field values are only defined on cells ...
113  */
114  for (it=1; it<=MED_N_CELL_FIXED_GEO; it++) {
115 
116  geotype = geotypes[it];
117  if ((nvalues = MEDfieldnValue(fid, fieldname, numdt, numit, MED_CELL, geotype)) < 0) {
118  MESSAGE("ERROR : read number of values ...");
119  goto ERROR;
120  }
121  if (nvalues) {
122  if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent)) == NULL) {
123  MESSAGE("ERROR : memory allocation ...");
124  goto ERROR;
125  }
126  if (MEDfieldValueRd(fid, fieldname, numdt, numit, MED_CELL, geotype,
127  MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, (unsigned char*) values) < 0) {
128  MESSAGE("ERROR : read fields values for cells ...");
129  free(values);
130  goto ERROR;
131  }
132  free(values);
133  }
134 
135  }
136  }
137  }
138 
139  ret=0;
140  ERROR:
141 
142  /* close file */
143  if (MEDfileClose(fid) < 0) {
144  MESSAGE("ERROR : close file ...");
145  ret=-1;
146  }
147 
148  return ret;
149 }
MEDfieldInfo
MEDC_EXPORT med_err MEDfieldInfo(const med_idt fid, const int ind, char *const fieldname, char *const meshname, med_bool *const localmesh, med_field_type *const fieldtype, char *const componentname, char *const componentunit, char *const dtunit, med_int *const ncstp)
Cette fonction permet de lire les informations concernant le champ d'indice ind .
Definition: MEDfieldInfo.c:42
MEDfieldnValue
MEDC_EXPORT med_int MEDfieldnValue(const med_idt fid, const char *const fieldname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_geometry_type geotype)
Cette fonction permet de lire le nombre de valeurs dans un champ pour une étape de calcul,...
Definition: MEDfieldnValue.c:38
MED_ACC_RDONLY
Definition: med.h:122
med_geometry_type
int med_geometry_type
Definition: med.h:196
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:84
med_idt
hid_t med_idt
Definition: med.h:333
MEDfieldValueRd
MEDC_EXPORT med_err MEDfieldValueRd(const med_idt fid, const char *const fieldname, const med_int numdt, const med_int numit, const med_entity_type entitype, const med_geometry_type geotype, const med_switch_mode switchmode, const med_int componentselect, unsigned char *const value)
Cette fonction permet de lire les valeurs d'un champ définies sur des entités d'un maillage pour une ...
Definition: MEDfieldValueRd.c:44
MESSAGE
#define MESSAGE(chaine)
Definition: med_utils.h:324
MED_FULL_INTERLACE
Definition: med.h:98
med_int
int med_int
Definition: med.h:344
MED_GET_CELL_GEOMETRY_TYPE
med_geometry_type MED_GET_CELL_GEOMETRY_TYPE[MED_N_CELL_FIXED_GEO+2]
Definition: MEDiterators.c:55
med_field_type
med_field_type
Definition: med.h:167
med_bool
med_bool
Definition: med.h:262
MEDfieldnComponent
MEDC_EXPORT med_int MEDfieldnComponent(const med_idt fid, const int ind)
Cette fonction lit le nombre de composantes d'un champ.
Definition: MEDfieldnComponent.c:34
MEDfieldComputingStepMeshInfo
MEDC_EXPORT med_err MEDfieldComputingStepMeshInfo(const med_idt fid, const char *const fieldname, const int csit, med_int *const numdt, med_int *const numit, med_float *const dt, med_int *const meshnumdt, med_int *const meshnumit)
Cette fonction permet de lire les informations caractérisant une étape de calcul : numéro de pas de t...
Definition: MEDfieldComputingStepMeshInfo.c:39
med_float
double med_float
Definition: med.h:338
MEDfileClose
MEDC_EXPORT med_err MEDfileClose(med_idt fid)
Fermeture d'un fichier MED.
Definition: MEDfileClose.c:30
MED_N_CELL_FIXED_GEO
#define MED_N_CELL_FIXED_GEO
Definition: med.h:241
MED_CELL
Definition: med.h:145
MED_NAME_SIZE
#define MED_NAME_SIZE
Definition: med.h:83
MED_ALL_CONSTITUENT
#define MED_ALL_CONSTITUENT
Definition: med.h:301
med_utils.h
main
int main(int argc, char **argv)
Definition: UsesCase_MEDfield_6.c:34
med.h
MEDfileOpen
MEDC_EXPORT med_idt MEDfileOpen(const char *const filename, const med_access_mode accessmode)
Ouverture d'un fichier MED.
Definition: MEDfileOpen.c:42
MEDnField
MEDC_EXPORT med_int MEDnField(const med_idt fid)
Cette fonction permet de lire le nombre de champs dans un fichier.
Definition: MEDnField.c:35