Actual source code: ex51.c

  1: static char help[] = "Demonstrates PetscFileRetrieve().\n\n";

  3: #include <petscsys.h>
  4: int main(int argc, char **argv)
  5: {
  6:   PetscBool  found;
  7:   char       localname[PETSC_MAX_PATH_LEN];
  8:   const char url[] = "https://web.cels.anl.gov/projects/petsc/download/datafiles/matrices/tiny";

 10:   /*
 11:     Every PETSc routine should begin with the PetscInitialize() routine.
 12:     argc, argv - These command line arguments are taken to extract the options
 13:                  supplied to PETSc and options supplied to MPI.
 14:     help       - When PETSc executable is invoked with the option -help,
 15:                  it prints the various options that can be applied at
 16:                  runtime.  The user can use the "help" variable place
 17:                  additional help messages in this printout.
 18:   */
 19:   PetscFunctionBeginUser;
 20:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
 21:   PetscCall(PetscFileRetrieve(PETSC_COMM_WORLD, url, localname, PETSC_MAX_PATH_LEN, &found));
 22:   if (found) {
 23:     PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Successfully download file %s\n", localname));
 24:   } else SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_PLIB, "Unable to download url %s", url);

 26:   PetscCall(PetscFinalize());
 27:   return 0;
 28: }

 30: /*TEST

 32:    test:
 33:      requires: defined(PETSC_HAVE_POPEN)

 35: TEST*/