Windows batch : find string contains another string inside a for loop

Question

I am trying to convert a set of PNG images to WEBP images using cwebp encoder. I managed to do it using a JAVA program but now I want to write a batch file to do this task. I already got metal03326's solution after some searching. But I want one modification in this that 9 patch images should be skipped.

Here is what I did :

pushd %1

set "DOTNINE=.9"

echo %DOTNINE%

for /f "delims=" %%n in ('dir /b /s /a-d-h-s') do (

set MY=%%~nn

set MY=%MY:~-2%

rem IF NOT ".webp" == "%%~xn" IF NOT "MY" == ".9" ("%~dp0cwebp.exe" -q 80 "%%n" -o "%%n.webp") ELSE (echo File already WEBP.)

)

popd

But I'm getting a syntax error. What is wrong in the above code?

No syntax error shown here on Win 7. Is it the entire batch script? — woxxom
– woxxom, Commented Jul 28, 2015 at 8:48
Removed the android tag, since this question has nothing to do with Android. — Phantômaxx
– Phantômaxx, Commented Jul 28, 2015 at 8:53

woxxom · Accepted Answer · 2015-07-28 08:51:16Z

1

To re-assign a variable (namely MY) multiple times in a loop you have to use delayed expansion:

setlocal enableDelayedExpansion
pushd "%~1"
for /f "delims=" %%n in ('dir /b /a-d-h-s') do (
    set MY=%%~nn
    set MY=!MY:~-2!
    IF NOT ".webp" == "%%~xn" IF NOT "!MY!" == ".9" ("%~dp0cwebp.exe" -q 80 "%%n" -o "%%n.webp") ELSE (echo File already WEBP.)
)
popd

answered Jul 28, 2015 at 8:51

woxxom

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2 Comments

userv Over a year ago

Thanks! It did the job :) One more thing - Is there a way to do this at one place i.e instead of creating MY variable do it in IF NOT condition ?

woxxom Over a year ago

set "MY=%%~nn" & set "MY=!MY:~-2!" & IF ....., for example. Another method would be to use for /f.

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