UsesCase_MEDmesh_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 
00019 /*
00020  *  Use case 3 : read an unstructured mesh : generic approach
00021  */
00022 
00023 
00024 #include <med.h>
00025 #define MESGERR 1
00026 #include <med_utils.h>
00027 
00028 #include <string.h>
00029 
00030 int main (int argc, char **argv) {
00031   med_idt fid;
00032   char meshname[MED_NAME_SIZE+1]="";
00033   char meshdescription[MED_COMMENT_SIZE+1]="";
00034   med_int meshdim=0;
00035   med_int spacedim=0;
00036   med_sorting_type sortingtype;
00037   med_int nstep;
00038   med_mesh_type meshtype;
00039   med_axis_type axistype;
00040   char *axisname="";
00041   char *unitname="";
00042   char dtunit[MED_SNAME_SIZE+1]="";
00043   med_float *coordinates = NULL;
00044   med_int nnodes = 0;
00045   med_int ngeo = 0;
00046   med_int nelt=0;
00047   med_int *connectivity = NULL;
00048   med_bool coordinatechangement;
00049   med_bool geotransformation;
00050   med_int i, j, it, nmesh;
00051   med_geometry_type geotype;
00052   med_geometry_type *geotypes = MED_GET_CELL_GEOMETRY_TYPE;
00053   char geotypename[MED_NAME_SIZE+1];
00054   int ret=-1;
00055 
00056 
00057   /* open MED file with READ ONLY access mode */
00058   fid = MEDfileOpen("UsesCase_MEDmesh_1.med",MED_ACC_RDONLY);
00059   if (fid < 0) {
00060     MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
00061     goto ERROR;
00062   }
00063 
00064   /* read how many mesh in the file */
00065   if ((nmesh = MEDnMesh(fid)) < 0) {
00066     MESSAGE("ERROR : read how many mesh ...");
00067     goto ERROR;
00068   }
00069 
00070   for (i=0;i<nmesh;i++) {
00071 
00072     /* read computation space dimension */
00073     if ((spacedim = MEDmeshnAxis(fid, i+1)) < 0) {
00074       MESSAGE("ERROR : read computation space dimension ...");
00075       goto ERROR;
00076     }
00077 
00078     /* memory allocation */
00079     if ((axisname  = (char*) malloc(MED_SNAME_SIZE*spacedim+1)) == NULL) {
00080       MESSAGE("ERROR : memory allocation ...");
00081       goto ERROR;
00082     }
00083     if ((unitname  = (char*) malloc(MED_SNAME_SIZE*spacedim+1)) == NULL) {
00084       MESSAGE("ERROR : memory allocation ...");
00085       goto ERROR;
00086     }
00087    
00088     /* read mesh informations : meshname, mesh dimension, mesh type ... */
00089     if (MEDmeshInfo(fid, i+1, meshname, &spacedim, &meshdim, &meshtype, meshdescription, 
00090                     dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
00091       MESSAGE("ERROR : mesh info ...");
00092       free(axisname); free(unitname);
00093       goto ERROR;
00094     }
00095 
00096     free(axisname);
00097     free(unitname);
00098     
00099     /* read how many nodes in the mesh */
00100     if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NO_GEOTYPE,
00101                                  MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
00102                                  &geotransformation)) < 0) {
00103       MESSAGE("ERROR : number of nodes ...");
00104     goto ERROR;
00105     }
00106     
00107     /* read mesh nodes coordinates */
00108     if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
00109       MESSAGE("ERROR : memory allocation ...");
00110       goto ERROR;
00111     }
00112     
00113     if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
00114                                 coordinates) < 0) {
00115       MESSAGE("ERROR : nodes coordinates ...");
00116       free(coordinates);
00117       goto ERROR;
00118     }
00119 
00120     if (coordinates)
00121       free(coordinates);
00122     
00123     /* read number of geometrical types for cells */
00124     if ((ngeo = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,MED_GEO_ALL,
00125                                MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
00126                                &geotransformation)) < 0) {
00127       MESSAGE("ERROR : number of cell ...");
00128       ISCRUTE(geotype);
00129       goto ERROR;
00130     }
00131 
00132     for (it=1; it<=ngeo; it++) {
00133 
00134       /* get geometry type */
00135       if ((nelt = MEDmeshEntityInfo(fid, meshname, MED_NO_DT, MED_NO_IT,MED_CELL,it,
00136                                    geotypename,&geotype)) < 0) {
00137         MESSAGE("ERROR : number of cell ...");
00138         ISCRUTE(it);
00139         goto ERROR;
00140       }
00141 
00142       /* how many cells of type geotype ? */
00143       if ((nelt = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,geotype,
00144                                  MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
00145                                    &geotransformation)) < 0) {
00146         MESSAGE("ERROR : number of cell ...");
00147         goto ERROR;
00148       }
00149       
00150       /* read cells connectivity in the mesh */
00151       if ((connectivity = (med_int *) malloc(sizeof(med_int)*nelt*(geotype%100))) == NULL) {
00152         MESSAGE("ERROR : memory allocation ...");
00153         goto ERROR;
00154       }
00155       
00156       if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
00157                                        geotype, MED_NODAL, MED_FULL_INTERLACE, connectivity) < 0) {
00158         MESSAGE("ERROR : cellconnectivity ...");
00159         ISCRUTE(geotype);
00160         free(connectivity);
00161         goto ERROR;
00162       }
00163       
00164       /* memory deallocation */
00165       if (connectivity) {
00166         free(connectivity);
00167         connectivity = NULL;
00168       }
00169 
00170 
00171     }
00172     
00173   }
00174   
00175   /* 
00176    * ... we know that the family number of nodes and elements is 0, a real working would check ...
00177    */
00178   ret=0;
00179  ERROR:
00180     
00181   /* close MED file */
00182   if (MEDfileClose(fid) < 0) {
00183     MESSAGE("ERROR : close file");             
00184     ret=-1; 
00185   } 
00186 
00187   return ret;
00188 }
00189 

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