[Batch] Convert String to Hex

demon.devin · Oct 2, 2017

The following batch script will take an input string and convert it into it's hex counterpart with a comma (,) delimiter every 2nd character.

Save this file to something like str2hex.bat

Call it like this:

str2hex.bat demon.devin

Return output:

64,65,6D,6F,6E,2E,64,65,76,69,6E

Code:

@echo off
setlocal EnableDelayedExpansion

:stringToHex
rem Store the string in chr.tmp file.
set /P "=%~1" < NUL > chr.tmp

rem Create zero.tmp file with the same number of ASCII zero characters.
for %%a in (chr.tmp) do fsutil file createnew zero.tmp %%~Za > NUL

rem Compare both files with FC /B and get the differences.
set "hex="
for /F "skip=1 tokens=2" %%a in ('fc /B chr.tmp zero.tmp') do set "hex=!hex!%%a"

del chr.tmp zero.tmp

set Text=%hex%
set output=

rem Batch files don't have a LEN function.
rem So this loop will process up to 500 chararcters by doing a substring on each.
for /L %%I in (0,2,500) do (
    call set Letter=!Text:~%%I,2!
    rem Only process when a letter is returned.
    if not "!Letter!" == "" (
        set output=!output!,!Letter!
    ) else (
        rem Otherwise, we have reached the end.
        goto DoneProcessing
    )
)

:DoneProcessing
rem Remove leading character.
set output=%output:~1,999%
echo %output%

[Batch] Convert String to Hex

demon.devin MDL Novice