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