Chris@42: Next: Wisdom String Export/Import from Fortran, Previous: Accessing the wisdom API from Fortran, Up: Accessing the wisdom API from Fortran [Contents][Index]
Chris@42:The easiest way to export and import wisdom is to do so using
Chris@42: fftw_export_wisdom_to_filename and
Chris@42: fftw_wisdom_from_filename. The only trick is that these
Chris@42: require you to pass a C string, which is an array of type
Chris@42: CHARACTER(C_CHAR) that is terminated by C_NULL_CHAR.
Chris@42: You can call them like this:
Chris@42:
integer(C_INT) :: ret Chris@42: ret = fftw_export_wisdom_to_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR) Chris@42: if (ret .eq. 0) stop 'error exporting wisdom to file' Chris@42: ret = fftw_import_wisdom_from_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR) Chris@42: if (ret .eq. 0) stop 'error importing wisdom from file' Chris@42:
Note that prepending ‘C_CHAR_’ is needed to specify that the
Chris@42: literal string is of kind C_CHAR, and we null-terminate the
Chris@42: string by appending ‘// C_NULL_CHAR’. These functions return an
Chris@42: integer(C_INT) (ret) which is 0 if an error
Chris@42: occurred during export/import and nonzero otherwise.
Chris@42:
It is also possible to use the lower-level routines
Chris@42: fftw_export_wisdom_to_file and
Chris@42: fftw_import_wisdom_from_file, which accept parameters of the C
Chris@42: type FILE*, expressed in Fortran as type(C_PTR).
Chris@42: However, you are then responsible for creating the FILE*
Chris@42: yourself. You can do this by using iso_c_binding to define
Chris@42: Fortran intefaces for the C library functions fopen and
Chris@42: fclose, which is a bit strange in Fortran but workable.
Chris@42: