2. Re: Doubling \\ in file names
On Wed, 18 Jun 2003 17:58:09 +1200 (06/18/03 15:58:09)
, Ray Tomes <rtomes at ihug.co.nz> wrote:
>
>
> Hi All
>
> I think that I am having trouble because of needing to double back
> slashes in a file name for various GUI commands such as extractIcon. If I
> have a file name with single back slashes then is there some function
> that will make them all double or am I doing something daft?
>
> What is the rule on what things treat "\" in text in this way (i.e. as a
> special escape character)? Is it always the case in all text strings, or
> do some just have normal single "\" in file names?
>
> I am using create( PictureButton, ... and want to put an extractIcon(f)
> command directly in as a parameter for the picture icon and it seems the
> reason for failure is that f has single back slashes.
>
Hi Ray,
this has nothing to do with file names, that's just a red-herring. Inside
string literals, the backslash character '\' has a special meaning. Certain
two-character combinations are used to represent special characters. They
are (from memory)...
\t The TAB character \n The new-line character
\\ The backslash character
This means that if you need to specify a backslash in a string you need to
write it as a double \\.
Thus "C:\\Program Files\\My Application\\abc.dat" is converted by Euphoria
to
C:\Program Files\My Application\abc.dat
The other combinations are useful for embedding new-lines and TABs inside
strings.
Hope this helps.
--
cheers,
Derek Parnell
3. Re: Doubling \\ in file names
----- Original Message -----
From: "Ray Tomes" <rtomes at ihug.co.nz>
To: "EUforum" <EUforum at topica.com>
Subject: Doubling \\ in file names
>
>
> Hi All
>
> I think that I am having trouble because of needing to double back
> slashes in a file name for various GUI commands such as extractIcon. If
> I have a file name with single back slashes then is there some function
> that will make them all double or am I doing something daft?
Try the function below, it's simple, no tests for if you happened to already
have doubled backslashes.
>
> What is the rule on what things treat "\" in text in this way (i.e. as a
> special escape character)? Is it always the case in all text strings,
> or do some just have normal single "\" in file names?
I think it's the same in all sequences, although it *may* be possible (I'm
not sure) that if you get a filename from some function like current_dir,
and then use that in some other function where a filename is expected, you
might not have to worry about double slashes? I forget.
Dan Moyer
>
> I am using create( PictureButton, ... and want to put an extractIcon(f)
> command directly in as a parameter for the picture icon and it seems the
> reason for failure is that f has single back slashes.
>
> I am going to have a working program soon! 
>
> Ray
>
>
-- function to make double backslashes out of singles:
function DblUpBkSlshs (sequence in)
sequence temp
temp = {}
for n = 1 to length(in) do
temp &= in[n]
if equal(in[n], '\\') then
temp &= "\\"
end if
end for
return temp
end function
--------------------------
-- test it:
include file.e
sequence a
a = current_dir()
puts(1, a & "\n")
a = DblUpBkSlshs(a)
puts(1, a & "\n")
a = "abc\\def\\ghijk\\"
puts(1, a & "\n")
a = DblUpBkSlshs(a)
puts(1, a)
>
>
> TOPICA - Start your own email discussion group. FREE!
>
>
5. Re: Doubling \\ in file names
aku saya wrote:
> You need to type double backslashes ONLY in source files (*.ex, *.exw),
> not in anything outside it.
Hi Aku and others
(hides red face)
Yes, I worked this out but couldn't get back here quick enough to pull
the string on my message back! 
Must have been programming too many hours lately!
Ray
6. Re: Doubling \\ in file names
Al,
That's a *very* clear & succinct explanation!
Dan Moyer
----- Original Message -----
From: "Al Getz" <Xaxo at aol.com>
To: "EUforum" <EUforum at topica.com>
Subject: RE: Doubling \\ in file names
>
>
> Hello again,
>
> The only time you dont use double backslashes is when
> you type an 'include' statement that includes a path
> directory name or whatever (in a source file).
>
> Ex:
>
> include c:\mydir\files\file.e
>
> Whenever they are inclosed in double quotes you have to:
>
> atom fn
> fn=open("C:\\dir\\file.txt","r")
>
> Take care for now,
> Al
>
>
>
> TOPICA - Start your own email discussion group. FREE!
>
7. Re: Doubling \\ in file names
I just always remember there are six. Straight from the Eu docs:
Special characters may be entered using a back-slash:=20
\n newline
\r carriage return
\t tab
\\ backslash
\" double quote
\' single quote
Pete
(Struggling to get through some 100+ posts (possibly not all from this
list) at the mo!)
