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escaping the % of filenames ???
Posted: 18 Nov 2011 11:24
by colargol
Hi all
A very last question
before the next oneI'm trying to undestand how we should manipulate filename given in parameters by third part application.
My batchs still have issues with some specials chars.
1. First, I think every time we have to assign a var to a filename, we should have Delayed Expansion disabled, like this:
Code: Select all
setlocal DisableDelayedExpansion
set "_file1=%~1"
set _file1& rem "%_file1%" will work with any characters, in any command line
setlocal EnableDelayedExpansion
set _file1& rem "!_file1!" will also work with any characters, in any command line
By working like this, we'll never have to escape chars in the main batch???
Am I right or wrong???
2. The % issue
As an example, let's take a file named
a%b.bat:
Code: Select all
set "_file=%~nx0"
set _file
>"new_file.bat" echo call "%_file%"
In this case,
new_file.bat won't work because the % of
a%b.bat has to be escaped...
but how??? I didn't found the solution
Thanks for help
Re: escaping the % of filenames ???
Posted: 18 Nov 2011 15:02
by colargol
Ok, I can escape % of a %~1 filename like this:
Code: Select all
set "filename=%~1"
setlocal EnableDelayedExpansion
set "filename=!filename:%%=%%%%!"
but it seems it is not possible to escape % of a filename that has been declared like this for example:
set "filename=a%b.bat"
This must be logical for everyone, but not for me
ps: it's hard to explain in english
Re: escaping the % of filenames ???
Posted: 18 Nov 2011 15:19
by Ed Dyreen
'
colargol wrote:set "filename=a%b.bat"
that's because it isn't really there.
Code: Select all
@echo off &setlocal enabledelayedexpansion
echo on
set "filename=a%%b.bat"
set "filename=!filename:%%=%%%%!"
Re: escaping the % of filenames ???
Posted: 18 Nov 2011 16:55
by colargol
Okay!
In fact, a single % in a string is (in most cases) the same as nothing. It took me 2 months to understand this
Re: escaping the % of filenames ???
Posted: 19 Nov 2011 16:07
by jeb
colargol wrote:In fact, a single % in a string is (in most cases) the same as nothing. It took me 2 months to understand this
Sorry, but you didn't understand why it is removed
A % is the beginning for a variable expansion, this is also true in
set "filename=a%b.bat", but the problem is here that the parser finds only one %, so he decides this must be a wrong variable expansion format and the % is removed.
You can see this with a filename like
Code: Select all
set "filename=a file %with two %.bat"
set filename
This results in "a file .bat" as the variable with the name "with two " is normaly not defined.
But now it you got another result.
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set "with two =XYZ"
set "filename=a file %with two %.bat"
set filename
This results in "a file XYZ.bat".
Ok but how to escape a % the right way?
Simply with another %
Code: Select all
set "filename=a file %%with two %%.bat"
set filename
Your replacings like
Are useless or even contra productive.
hope it helps
jeb
Re: escaping the % of filenames ???
Posted: 19 Nov 2011 16:49
by colargol
That's very clear, thanks again jeb
