# UsesCase_MEDmesh_14.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 14 : read a 2D unstructured mesh with 2 polygons
    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 npoly = 0;
    00044   med_int indexsize;
    00045   med_int *index = NULL;
    00046   med_int *connectivity = NULL;
    00047   med_int connectivitysize;
    00048   med_bool coordinatechangement;
    00049   med_bool geotransformation;
    00050   int i;
    00051   int k,ind1,ind2;
    00052   int ret=-1;
    00053
    00054   /* open MED file with READ ONLY access mode */
    00055   fid = MEDfileOpen("UsesCase_MEDmesh_13.med",MED_ACC_RDONLY);
    00056   if (fid < 0) {
    00057     MESSAGE("ERROR : open file in READ ONLY ACCESS mode ...");
    00058     goto ERROR;
    00059   }
    00060
    00061   /*
    00062    * ... we know that the MED file has only one mesh,
    00063    * a real code working would check ...
    00064    */
    00065
    00066   /* read mesh informations : mesh dimension, space dimension ... */
    00067   if (MEDmeshInfoByName(fid, meshname, &spacedim, &meshdim, &meshtype, meshdescription,
    00068                         dtunit, &sortingtype, &nstep, &axistype, axisname, unitname) < 0) {
    00069     MESSAGE("ERROR : mesh info ...");
    00070     goto ERROR;
    00071   }
    00072
    00073   /* read how many nodes in the mesh */
    00074   if ((nnodes = MEDmeshnEntity(fid, meshname, MED_NO_DT, MED_NO_IT, MED_NODE, MED_POINT1,
    00075                                MED_COORDINATE, MED_NO_CMODE,&coordinatechangement,
    00076                                &geotransformation)) < 0) {
    00077     MESSAGE("ERROR : number of nodes ...");
    00078     goto ERROR;
    00079   }
    00080
    00081   /*
    00082    * ... we know that we only have MED_POLYGON celles in the mesh,
    00083    * a real code working would check all MED geometry cell types ...
    00084    */
    00085
    00086   /* How many polygon in the mesh in nodal connectivity mode */
    00087   /* For the polygons, we get the size of array index */
    00088   if ((indexsize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
    00089                                   MED_CELL,MED_POLYGON,MED_INDEX_NODE,MED_NODAL,
    00090                                   &coordinatechangement,
    00091                                   &geotransformation)) < 0) {
    00092     MESSAGE("ERROR : read number of polygon ...");
    00093     goto ERROR;
    00094   }
    00095   npoly = indexsize-1;
    00096
    00097   /* how many nodes for the polygon connectivity ? */
    00098   if ((connectivitysize = MEDmeshnEntity(fid,meshname,MED_NO_DT,MED_NO_IT,
    00099                                          MED_CELL,MED_POLYGON,MED_CONNECTIVITY,MED_NODAL,
    00100                                          &coordinatechangement,
    00101                                          &geotransformation)) < 0) {
    00102     MESSAGE("ERROR : read connevity size ...");
    00103     goto ERROR;
    00104     }
    00105
    00106   /* read mesh nodes coordinates */
    00107   if ((coordinates = (med_float*) malloc(sizeof(med_float)*nnodes*spacedim)) == NULL) {
    00108     MESSAGE("ERROR : memory allocation ...");
    00109     goto ERROR;
    00110   }
    00111
    00112   if (MEDmeshNodeCoordinateRd(fid, meshname, MED_NO_DT, MED_NO_IT, MED_FULL_INTERLACE,
    00113                               coordinates) < 0) {
    00114     MESSAGE("ERROR : nodes coordinates ...");
    00115     free(coordinates);
    00116     goto ERROR;
    00117   }
    00118   free(coordinates);
    00119
    00120   /* read polygons connectivity */
    00121   index = (med_int *) malloc(sizeof(med_int)*indexsize);
    00122   connectivity = (med_int *) malloc(sizeof(med_int)*connectivitysize);
    00123
    00124   if (MEDmeshPolygonRd(fid,meshname,MED_NO_DT,MED_NO_IT,MED_CELL,MED_NODAL,
    00125                        index,connectivity) < 0) {
    00126     MESSAGE("ERROR : read polygon connectivity ...");
    00127     free(index);
    00128     free(connectivity);
    00129     goto ERROR;
    00130   }
    00131   free(index);
    00132   free(connectivity);
    00133
    00134   /*
    00135    * ... we know that the family number of nodes and elements is 0, a real working would check ...
    00136    */
    00137
    00138   ret=0;
    00139  ERROR:
    00140
    00141   /* close MED file */
    00142   if (MEDfileClose(fid) < 0) {
    00143     MESSAGE("ERROR : close file");
    00144     ret=-1;
    00145   }
    00146
    00147   return ret;
    00148 }
    00149