1. haha very funny
- Posted by euman at bellsouth.net
Oct 21, 2001
sequence dirs
dirs = dir(FileSpec)
for i = 1 to length(dirs) do
dirs will actually contain file or directory info if there are any files or
directories
This from the Euphoria docs:
d = dir(current_dir()) -- this says right up front dir( ) returns a sequence
doesnt it!
-- d might have:
{
{".", "d", 0 1994, 1, 18, 9, 30, 02},
{"..", "d", 0 1994, 1, 18, 9, 20, 14},
{"fred", "ra", 2350, 1994, 1, 22, 17, 22, 40},
{"sub", "d" , 0, 1993, 9, 20, 8, 50, 12}
}
OK, very well then, but when it doesnt contain info the return value is -1 which
gives us a type_check error...
OK then, we name dirs as an object and because we look for a length to dirs
next we get this error message > length of an atom not defined.....huh
this from the Euphoria Docs
If there is no file or directory with this name then -1 is returned
OK, if we keep the dir defined as an object and run a test to make sure dirs is
not -1 like
this:
if dir(FileSpec) != -1 then we get true/false condition must be an ATOM
and damn I could list several other error messages and code but you all get the
point now.
We are so restricted it's not funny...
I'll go to bed now.....later yall.
Euman
euman at bellsouth.net
2. Re: haha very funny
euman at bellsouth.net wrote:
> d = dir(current_dir()) -- this says right up front dir( ) returns a
sequence doesnt it!
Well, not really. It returns a sequence _if_ the routine succeeds. If
not, it returns an integer. So you can write your test:
object d
d = dir( ... )
if integer( d ) then
... failure code
else
... success code
end if
or use 'not sequence(d)' if you prefer. It's idiomatic to Euphoria, and
shows up in a number of places. For example:
while 1 do
result = gets( handle )
if integer( handle ) then
exit
end if
end while
I'll grant that it's a bit odd, but it's more or less consistant.
-- David Cuny
