1 2 static char help[] = "Demonstrates PetscFileRetrieve().\n\n"; 3 4 /*T 5 Concepts: introduction to PETSc; 6 Concepts: printing^in parallel 7 Processors: n 8 T*/ 9 10 #include <petscsys.h> 11 int main(int argc,char **argv) 12 { 13 PetscErrorCode ierr; 14 PetscBool found; 15 char localname[PETSC_MAX_PATH_LEN]; 16 const char url[] = "https://www.mcs.anl.gov/petsc/index.html"; 17 18 /* 19 Every PETSc routine should begin with the PetscInitialize() routine. 20 argc, argv - These command line arguments are taken to extract the options 21 supplied to PETSc and options supplied to MPI. 22 help - When PETSc executable is invoked with the option -help, 23 it prints the various options that can be applied at 24 runtime. The user can use the "help" variable place 25 additional help messages in this printout. 26 */ 27 ierr = PetscInitialize(&argc,&argv,(char*)0,help);if (ierr) return ierr; 28 ierr = PetscFileRetrieve(PETSC_COMM_WORLD,url,localname,PETSC_MAX_PATH_LEN,&found);CHKERRQ(ierr); 29 if (found) { 30 ierr = PetscPrintf(PETSC_COMM_WORLD,"Successfully download file %s\n",localname);CHKERRQ(ierr); 31 } else SETERRQ1(PETSC_COMM_WORLD,PETSC_ERR_PLIB,"Unable to download url %s\n",url); 32 33 ierr = PetscFinalize(); 34 return ierr; 35 } 36 37 /*TEST 38 39 test: 40 requires: define(PETSC_HAVE_POPEN) 41 42 TEST*/ 43