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UsesCase_MEDfield_6.c
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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 * 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;
50 med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
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 }
MED_FULL_INTERLACE
Definition: med.h:96
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_geometry_type
int med_geometry_type
Definition: med.h:194
MED_SNAME_SIZE
#define MED_SNAME_SIZE
Definition: med.h:82
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
med_idt
hid_t med_idt
Definition: med.h:331
MED_ACC_RDONLY
Definition: med.h:120
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_field_type
med_field_type
Definition: med.h:165
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
MED_GET_CELL_GEOMETRY_TYPE
med_geometry_type MED_GET_CELL_GEOMETRY_TYPE[MED_N_CELL_FIXED_GEO+2]
Definition: MEDiterators.c:55
med.h
med_bool
med_bool
Definition: med.h:260
med_float
double med_float
Definition: med.h:336
main
int main(int argc, char **argv)
Definition: UsesCase_MEDfield_6.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_N_CELL_FIXED_GEO
#define MED_N_CELL_FIXED_GEO
Definition: med.h:239
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_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
MED_ALL_CONSTITUENT
#define MED_ALL_CONSTITUENT
Definition: med.h:299
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
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
med_utils.h