I think I ran into a bug in Window's batch scripting.
I cannot set variables that are in an expanded if statement.
Here is an isolated part of my script:
@echo off
set success=1
set Version=12345
set Target=Client
set Type=456
set dir=
set zip=
if "%Version%"=="" set success=0
if "%Type%"=="" set success=0
if 1==1 set test=42
if %success%==1 (
set test2=57005
if "%Target%"=="Client" (
set dir=ModName v%Version%
set zip=ModName v%Version% %Type%.zip
echo Version: %Version%
echo Type: %Type%
echo.
echo Target: %Target%
echo dir: %dir%
echo zip: %zip%
echo.
echo test: %test%
echo test2: %test2%
)
) else (
echo Not successful.
)
This is the output from a brand new instance of cmd:
C:\Users\RandomClown\Desktop>test.bat
Version: 12345
Type: 456
Target: Client
dir:
zip:
test: 42
test2:
What you should notice is that the single line if statement correctly sets stuff.
The multiline if will perform anything that is NOT a set. I dont think I missed anything.
Also, the multiline if statement is correctly executing the right lines, as the else ( echo Not successful. )
lines did not execute.
Why did the lines not execute?
You missed something ;-)
cmd
expands variables when commands are parsed, not when they are run. It so happens that an if
or for
statement with a block ( ... )
(or actually any block) counts as a single command in that case. So when you set variables inside a block and try using them in the same block there are no variables anymore – they were replaced by the values the variables had before the block even executed.
Stick a
setlocal enabledelayedexpansion
at the start of your batch file and use !zip!
instead of %zip%
. See help set
for a detailed discussion of the problem.
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