saveToFile
Writes the contents of @key_file to @filename using g_file_set_contents(). If you need stricter guarantees about durability of the written file than are provided by g_file_set_contents(), use g_file_set_contents_full() with the return value of g_key_file_to_data().
This function can fail for any of the reasons that g_file_set_contents() may fail.
Return
true if successful, else false with @error set
Since
2.40
Parameters
filename
the name of the file to write to