UsesCase_MEDmesh_2.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  *  Use case 2 : read a 2D unstructured mesh with 15 nodes, 8 triangular cells, 4 triangular cells
00020  */
00021 
00022 #include <med.h>
00023 #define MESGERR 1
00024 #include <med_utils.h>
00025 
00026 #include <string.h>
00027 
00028 int main (int argc, char **argv) {
00029   med_idt fid;
00030   const char meshname[MED_NAME_SIZE+1] = "2D unstructured mesh";
00031   char meshdescription[MED_COMMENT_SIZE+1];
00032   med_int meshdim;
00033   med_int spacedim;
00034   med_sorting_type sortingtype;
00035   med_int nstep;
00036   med_mesh_type meshtype;
00037   med_axis_type axistype;
00038   char axisname[2*MED_SNAME_SIZE+1];
00039   char unitname[2*MED_SNAME_SIZE+1];
00040   char dtunit[MED_SNAME_SIZE+1];
00041   med_float *coordinates = NULL;
00042   med_int nnodes = 0;
00043   med_int *triaconnectivity = NULL;
00044   med_int ntria3 = 0;
00045   med_int *quadconnectivity = NULL;
00046   med_int nquad4 = 0;
00047   med_bool coordinatechangement;
00048   med_bool geotransformation;
00049   int i;
00050   int ret = -1;
00051 
00052   /* open MED file with READ ONLY access mode */
00053   fid = MEDfileOpen("UsesCase_MEDmesh_1.med",MED_ACC_RDONLY);
00054   if (fid < 0) {
00055     MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
00056     goto ERROR;
00057   }
00058 
00059   /* 
00060    * ... we know that the MED file has only one mesh, 
00061    * a real code working would check ... 
00062    */
00063 
00064   /* read mesh informations : mesh dimension, space dimension ... */
00065   if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription, 
00066                         dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
00067     MESSAGE("ERROR : mesh info ...");
00068     goto ERROR;
00069   }
00070 
00071   /* read how many nodes in the mesh */
00072   if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_NO_GEOTYPE,
00073                                MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
00074                                &geotransformation)) < 0) {
00075     MESSAGE("ERROR : number of nodes ...");
00076     goto ERROR;
00077   }
00078   
00079   /* 
00080    * ... we know that we only have MED_TRIA3 and MED_QUAD4 in the mesh, 
00081    * a real code working would check all MED geometry cell types ... 
00082    */
00083 
00084   /* read how many triangular cells in the mesh */
00085   if ((ntria3 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,MED_TRIA3,
00086                                MED_CONNECTIVITY, MED_NODAL,&coordinatechangement,
00087                                &geotransformation)) < 0) {
00088     MESSAGE("ERROR : number of MED_TRIA3 ...");
00089     goto ERROR;
00090   }
00091 
00092   /* read how many quadrangular cells in the mesh */
00093   if ((nquad4 = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,MED_QUAD4,
00094                                MED_CONNECTIVITY, MED_NODAL, &coordinatechangement,
00095                                &geotransformation)) < 0) {
00096     MESSAGE("ERROR : number of MED_QUAD4 ...");
00097     goto ERROR;
00098   }
00099 
00100 
00101   /* read mesh nodes coordinates */
00102   if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
00103     MESSAGE("ERROR : memory allocation ...");
00104     goto ERROR;
00105   }
00106 
00107   if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
00108                               coordinates) < 0) {
00109     MESSAGE("ERROR : nodes coordinates ...");
00110     goto ERROR;
00111   }
00112 
00113   /* read cells connectivity in the mesh */
00114   if ((triaconnectivity = (med_int *) malloc(sizeof(med_int)*ntria3*3)) == NULL) {
00115     MESSAGE("ERROR : memory allocation ...");
00116     goto ERROR;
00117   }
00118   if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
00119                                    MED_TRIA3, MED_NODAL, MED_FULL_INTERLACE, triaconnectivity) < 0) {
00120     MESSAGE("ERROR : MED_TRIA3 connectivity ...");
00121     goto ERROR;
00122   }
00123 
00124   if ((quadconnectivity = (med_int *) malloc(sizeof(med_int)*nquad4*4)) == NULL) {
00125     MESSAGE("ERROR : memory allocation ...");
00126     goto ERROR;
00127   }
00128   if (MEDmeshElementConnectivityRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_CELL,
00129                                    MED_QUAD4, MED_NODAL, MED_FULL_INTERLACE, quadconnectivity) < 0) {
00130     MESSAGE("ERROR : MED_TRIA3 connectivity ...");
00131     goto ERROR;
00132   }
00133 
00134   /* 
00135    * ... we know that the family number of nodes and elements is 0, a real working would check ...
00136    */
00137   ret = 0;
00138  ERROR :
00139 
00140   /* memory desallocation */
00141   if (coordinates)
00142     free(coordinates);
00143 
00144   if (triaconnectivity)
00145     free(triaconnectivity);
00146 
00147   if (quadconnectivity)
00148     free(quadconnectivity);
00149 
00150   /* close MED file */
00151   if (MEDfileClose(fid) < 0) {
00152     MESSAGE("ERROR : close file");             
00153     ret = -1; 
00154   } 
00155 
00156   return ret;
00157 }
00158 

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