MED fichier
UsesCase_MEDfield_3.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 #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;
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 }
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
med_float
double med_float
Definition: med.h:338
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
main
int main(int argc, char **argv)
Definition: UsesCase_MEDfield_3.c:35
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
MED_NODE
Definition: med.h:145
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
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