UsesCase_MEDfield_3.c

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00001 /*  This file is part of MED.
00002  *
00003  *  COPYRIGHT (C) 1999 - 2015  EDF R&D, CEA/DEN
00004  *  MED is free software: you can redistribute it and/or modify
00005  *  it under the terms of the GNU Lesser General Public License as published by
00006  *  the Free Software Foundation, either version 3 of the License, or
00007  *  (at your option) any later version.
00008  *
00009  *  MED is distributed in the hope that it will be useful,
00010  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012  *  GNU Lesser General Public License for more details.
00013  *
00014  *  You should have received a copy of the GNU Lesser General Public License
00015  *  along with MED.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 
00018 #include <med.h>
00019 #define MESGERR 1
00020 #include <med_utils.h>
00021 
00022 #include <string.h>
00023 
00024 #include <med.h>
00025 #define MESGERR 1
00026 #include <med_utils.h>
00027 
00028 #include <string.h>
00029 
00030 /* 
00031  * Field use case 3 : read a field (generic approach)
00032  */
00033 
00034 
00035 int main (int argc, char **argv) {
00036   med_idt fid;
00037   med_idt nfield, i, j;
00038   char meshname[MED_NAME_SIZE+1]="";
00039   med_bool localmesh;
00040   char fieldname[MED_NAME_SIZE+1]="";
00041   med_field_type fieldtype;
00042   char *componentname = NULL;
00043   char *componentunit = NULL;
00044   char dtunit[MED_SNAME_SIZE+1]="";
00045   med_float *values = NULL;
00046   med_int nstep, nvalues;
00047   med_int ncomponent;
00048   med_geometry_type geotype;
00049   med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
00050   int ret=-1;
00051 
00052   /* file creation */
00053   fid = MEDfileOpen("UsesCase_MEDfield_1.med",MED_ACC_RDONLY);
00054   if (fid < 0) {
00055     MESSAGE("ERROR : open file ...");
00056     goto ERROR;
00057   }
00058 
00059   /*
00060    * generic approach : how many fields in the file and identification
00061    * of each field.
00062    */
00063   if ((nfield = MEDnField(fid)) < 0) {
00064     MESSAGE("ERROR : How many fields in the file ...");
00065     goto ERROR;
00066   }
00067 
00068   for (i=0; i<nfield; i++) {
00069 
00070     /* field information 
00071      * ... we know that the field has no computation step 
00072      * and that the field values type is MED_FLOAT64, a real code working would check ... 
00073      */
00074     if ((ncomponent = MEDfieldnComponent(fid,i+1)) < 0) {
00075       MESSAGE("ERROR : number of field component ...");
00076       goto ERROR;
00077     }
00078 
00079     if ((componentname = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
00080       MESSAGE("ERROR : memory allocation ...");
00081       goto ERROR;
00082     }
00083 
00084     if ((componentunit = (char *) malloc(ncomponent*MED_SNAME_SIZE+1)) == NULL) {
00085       MESSAGE("ERROR : memory allocation ...");
00086       goto ERROR;
00087     }    
00088 
00089     if (MEDfieldInfo(fid, i+1, fieldname, meshname, &localmesh, &fieldtype,
00090                      componentname, componentunit, dtunit, &nstep) < 0) {
00091       MESSAGE("ERROR : Field info ...");
00092       free(componentname); free(componentunit);
00093       goto ERROR;
00094     }
00095     free(componentname); free(componentunit);
00096 
00097     /* read field values for nodes and cells */
00098     
00099     /* MED_NODE */
00100     if ((nvalues = MEDfieldnValue(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NONE)) < 0) {
00101       MESSAGE("ERROR : read number of values ...");
00102       goto ERROR;
00103     }
00104 
00105     if (nvalues) {
00106       if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent)) == NULL) {
00107         MESSAGE("ERROR : memory allocation ...");
00108         goto ERROR;
00109       }
00110       if (MEDfieldValueRd(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NONE,
00111                           MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, (unsigned char*) values) < 0) {
00112         MESSAGE("ERROR : read fields values defined on vertices ...");
00113         free(values);
00114         goto ERROR;
00115       }
00116       free(values);
00117     }
00118 
00119     /* MED_CELL */
00120     for (j=1; j<=MED_N_CELL_FIXED_GEO; j++) {
00121       geotype = geotypes[j];
00122   
00123       if ((nvalues = MEDfieldnValue(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_CELL, 
00124                                     geotype)) < 0) {
00125         MESSAGE("ERROR : read number of values ...");
00126         goto ERROR;
00127       }
00128 
00129       if (nvalues) {
00130         if ((values = (med_float *) malloc(sizeof(med_float)*nvalues*ncomponent)) == NULL) {
00131           MESSAGE("ERROR : memory allocation ...");
00132           goto ERROR;
00133         }
00134         if (MEDfieldValueRd(fid, fieldname, MED_NO_DT, MED_NO_IT, MED_CELL, geotype,
00135                             MED_FULL_INTERLACE, MED_ALL_CONSTITUENT, (unsigned char*) values) < 0) {
00136           MESSAGE("ERROR : read fields values for cells ...");
00137           free(values);
00138           goto ERROR;
00139         }  
00140         free(values);
00141       }
00142     }
00143   }
00144   
00145   ret=0;
00146  ERROR:
00147 
00148   /* close file */
00149   if (MEDfileClose(fid) < 0) {
00150     MESSAGE("ERROR : close file ...");             
00151     ret=-1; 
00152   } 
00153   
00154   return ret;
00155 }

Généré le Thu Oct 8 14:26:17 2015 pour MED fichier par  doxygen 1.6.1