`$whence` means “whence” adverb 1. from what place or source.
So it should be one of the values of the `SeekType` enum say SeekType.enums.keys # (SeekFromCurrent SeekFromBeginning SeekFromEnd) - `SeekFromCurrent` means it is relative to where it is currently (go forward/backward) $fh.read(1); $fh.seek( -1, SeekFromCurrent); $fh.read(1); # same as previous `.read` # pretend to have read 5 bytes $fh.seek( 5, SeekFromCurrent ); - `SeekFromBeginning` means absolute position. # restart at beginning, and then skip forward 5 bytes $fh.seek( 5, SeekFromBeginning ); - `SeekFromEnd` means absolute position, except starting at the end of the file $fh.seek( -1, SeekFromEnd ); $fh.read(1); # read last byte On Sat, Feb 2, 2019 at 9:02 PM ToddAndMargo via perl6-users <email@example.com> wrote: > > On 2/2/19 3:16 AM, Shlomi Fish wrote: > > On Sat, 2 Feb 2019 01:08:39 -0800 > > ToddAndMargo via perl6-users <firstname.lastname@example.org> wrote: > > > >> Hi All, > >> > >> Is there a way to modify this to start reading at > >> a specific index? And include how many bytes (3000000) > >> to read as well? > >> > >> my $FileHandle = open( $FileName, :bin, :ro ); > >> my Buf $BinaryFile = $FileHandle.read( 3000000 ); > >> > >> Many thanks, > >> -T > > > > See https://docs.perl6.org/routine/seek . > > > > > > > Thank you! > > > I am not sure exactly what they mean by "$whence". > > method seek(IO::Handle:D: Int:D $offset, SeekType:D $whence --> True) > > SeekFromBeginning: The beginning of the file. > > my Bool $GoodRead = seek($FileHandle, $offset, SeekFromBeginning ); > my Bool $GoodRead = seek.$FileHandle( $offset, SeekFromBeginning ); > > Or do I need to assign something to a variable called "$whence"? > > Many thanks, > -T > > > > -- > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Computers are like air conditioners. > They malfunction when you open windows > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~