# UsesCase_MEDmesh_2.c

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    00001 /*  This file is part of MED.
    00002  *
    00003  *  COPYRIGHT (C) 1999 - 2012  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