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UsesCase_MEDfield_3.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 #include <med.h>
19 #define MESGERR 1
20 #include <med_utils.h>
21
22 #include <string.h>
23
24 #include <med.h>
25 #define MESGERR 1
26 #include <med_utils.h>
27
28 #include <string.h>
29
30 /*
31 * Field use case 3 : read a field (generic approach)
32 */
33
34
35 int main (int argc, char **argv) {
36 med_idt fid;
37 med_idt nfield, i, j;
38 char meshname[MED_NAME_SIZE+1]="";
39 med_bool localmesh;
40 char fieldname[MED_NAME_SIZE+1]="";
41 med_field_type fieldtype;
42 char *componentname = NULL;
43 char *componentunit = NULL;
44 char dtunit[MED_SNAME_SIZE+1]="";
45 med_float *values = NULL;
46 med_int nstep, nvalues;
47 med_int ncomponent;
48 med_geometry_type geotype;
49 med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
50 int ret=-1;
51
52 /* file creation */
53 fid = MEDfileOpen("UsesCase_MEDfield_1.med",MED_ACC_RDONLY);
54 if (fid < 0) {
55 MESSAGE("ERROR : open file ...");
56 goto ERROR;
57 }
58
59 /*
60 * generic approach : how many fields in the file and identification
61 * of each field.
62 */
63 if ((nfield = MEDnField(fid)) < 0) {
64 MESSAGE("ERROR : How many fields in the file ...");
65 goto ERROR;
66 }
67
68 for (i=0; i<nfield; i++) {
69
70 /* field information
71 * ... we know that the field has no computation step
72 * and that the field values type is MED_FLOAT64, a real code would check ...
73 */
74 if ((ncomponent = MEDfieldnComponent(fid,i+1)) < 0) {
75 MESSAGE("ERROR : number of field component ...");
76 goto ERROR;
77 }
78
79 if ((componentname = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
80 MESSAGE("ERROR : memory allocation ...");
81 goto ERROR;
82 }
83
84 if ((componentunit = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
85 MESSAGE("ERROR : memory allocation ...");
86 goto ERROR;
87 }
88
89 if (MEDfieldInfo(fid, i+1, fieldname, meshname, &localmesh, &fieldtype,
90 componentname, componentunit, dtunit, &nstep) < 0) {
91 MESSAGE("ERROR : Field info ...");
92 free(componentname); free(componentunit);
93 goto ERROR;
94 }
95 free(componentname); free(componentunit);
96
97 /* read field values for nodes and cells */
98
99 /* MED_NODE */
100 if ((nvalues = MEDfieldnValue(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NONE)) < 0) {
101 MESSAGE("ERROR : read number of values ...");
102 goto ERROR;
103 }
104
105 if (nvalues) {
106 if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent)) == NULL) {
107 MESSAGE("ERROR : memory allocation ...");
108 goto ERROR;
109 }
110 if (MEDfieldValueRd(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NONE,
111 MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, (unsigned char*) values) < 0) {
112 MESSAGE("ERROR : read fields values defined on vertices ...");
113 free(values);
114 goto ERROR;
115 }
116 free(values);
117 }
118
119 /* MED_CELL */
120 for (j=1; j<=MED_N_CELL_FIXED_GEO; j++) {
121 geotype = geotypes[j];
122
123 if ((nvalues = MEDfieldnValue(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_CELL,
124 geotype)) < 0) {
125 MESSAGE("ERROR : read number of values ...");
126 goto ERROR;
127 }
128
129 if (nvalues) {
130 if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent)) == NULL) {
131 MESSAGE("ERROR : memory allocation ...");
132 goto ERROR;
133 }
134 if (MEDfieldValueRd(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_CELL, geotype,
135 MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, (unsigned char*) values) < 0) {
136 MESSAGE("ERROR : read fields values for cells ...");
137 free(values);
138 goto ERROR;
139 }
140 free(values);
141 }
142 }
143 }
144
145 ret=0;
146 ERROR:
147
148 /* close file */
149 if (MEDfileClose(fid) < 0) {
150 MESSAGE("ERROR : close file ...");
151 ret=-1;
152 }
153
154 return ret;
155 }
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
MED_NO_DT
#define MED_NO_DT
Definition: med.h:320
MED_NONE
#define MED_NONE
Definition: med.h:231
MED_NODE
Definition: med.h:143
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
main
int main(int argc, char **argv)
Definition: UsesCase_MEDfield_3.c:35
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
MED_NO_IT
#define MED_NO_IT
Definition: med.h:321
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