Chris@10: Next: Wisdom String Export/Import from Fortran, Chris@10: Previous: Accessing the wisdom API from Fortran, Chris@10: Up: Accessing the wisdom API from Fortran Chris@10:
The easiest way to export and import wisdom is to do so using
Chris@10: fftw_export_wisdom_to_filename and
Chris@10: fftw_wisdom_from_filename. The only trick is that these
Chris@10: require you to pass a C string, which is an array of type
Chris@10: CHARACTER(C_CHAR) that is terminated by C_NULL_CHAR.
Chris@10: You can call them like this:
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integer(C_INT) :: ret Chris@10: ret = fftw_export_wisdom_to_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR) Chris@10: if (ret .eq. 0) stop 'error exporting wisdom to file' Chris@10: ret = fftw_import_wisdom_from_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR) Chris@10: if (ret .eq. 0) stop 'error importing wisdom from file' Chris@10:Chris@10:
Note that prepending ‘C_CHAR_’ is needed to specify that the
Chris@10: literal string is of kind C_CHAR, and we null-terminate the
Chris@10: string by appending ‘// C_NULL_CHAR’. These functions return an
Chris@10: integer(C_INT) (ret) which is 0 if an error
Chris@10: occurred during export/import and nonzero otherwise.
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It is also possible to use the lower-level routines
Chris@10: fftw_export_wisdom_to_file and
Chris@10: fftw_import_wisdom_from_file, which accept parameters of the C
Chris@10: type FILE*, expressed in Fortran as type(C_PTR).
Chris@10: However, you are then responsible for creating the FILE*
Chris@10: yourself. You can do this by using iso_c_binding to define
Chris@10: Fortran intefaces for the C library functions fopen and
Chris@10: fclose, which is a bit strange in Fortran but workable.
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