creating image with batch >>%cd% - batch-file

Question

i would like to see if its possible to echo to an image like you can echo to a file:
echo Hello World! >>"%cd%/test.txt
Like this:
echo (base64 code) >>"%cd%/image.jpg"
what is even wrong with this?
it creates a jpeg file but it gives me the error that it can't be opened.
(probably of its code structure)
I checked it with the base64 to image converter and there is nothing wrong.
Why doesn't it create an image?

Answer 1

This batch file Certutil_B64_Encoding_Files.bat can let you to drag and drop any file like a jpg or png or any file else and generate another batch file with the encoded file inside, So, when you execute it, the file will be decoded and generated to the original.
Just save this code on your notepad or on notepad++ or on any text editor as :
Certutil_B64_Encoding_Files.bat and drag and drop any file over it to be encoded
#echo off
Title Encoding files with CERTUTIL utility by Hackoo 2018
color 0A & Mode 83,3
If "%~1"=="" (
color 0C & Mode 80,3
echo(
echo You must drag and drop a file over this batch script to be encoded !
Timeout /T 5 /nobreak>nul & exit /b
)
#for /f %%i in ("certutil.exe") do if not exist "%%~$path:i" (
echo CertUtil.exe not found.
pause
exit /b
)
set "TempFile=%Temp%\Temp_b64
set "OutputFile=%~nx1_encoded%~x0"
If exist "%OutputFile%" Del "%OutputFile%" >nul 2>&1
echo(
echo Please wait a while ... Encoding "%~nx1" is in progress ...
certutil.exe -f -encode "%~1" "%TempFile%" >nul 2>&1
(
echo #echo off
echo Title My head kinda look like this
echo echo Hello, my name is Kalesheezer, but you can call me Digi Kulamba
echo echo and my head kinda look like this:
echo CERTUTIL -f -decode "%%~f0" "%%Temp%%\%~nx1" ^>nul 2^>^&1
echo Timeout /T 5 /nobreak^>nul
echo Start "%~n1" "%%Temp%%\%~nx1"
echo Exit
)>> "%OutputFile%"
copy "%OutputFile%" /b + "%TempFile%" /b >nul 2>&1
If exist "%TempFile%" Del "%TempFile%" >nul 2>&1
Timeout /T 2 /NoBreak>nul & exit
And here is an example that i tested with my avatar Hackoo.png
Hackoo.png_encoded.bat
#echo off
Title My head kinda look like this
echo Hello, my name is Kalesheezer, but you can call me Digi Kulamba
echo and my head kinda look like this:
CERTUTIL -f -decode "%~f0" "%Temp%\Hackoo.png" >nul 2>&1
Timeout /T 5 /nobreak>nul
Start "Hackoo" "%Temp%\Hackoo.png"
Exit
-----BEGIN CERTIFICATE-----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56RFT/6Ko1Tu2KR+gVGaQc0p4NMgw/HfjDT/AAB4P1nxHqrmPTtKtZLudkGW2opJ
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RSKSro2OOGBGR161+cvwd/4Jr/EDxZd29z40nh8H6TlWlh3LPeSL6KqnapPqx4/u
mv0o+Gnw60T4U+DdM8MeH7Y2ul2EeyNWO53JOS7t3ZiSSfWrM5JHT1yHxY+Iln8K
vh/rfii+ikng023M3kxfekPZR9T37DJr5/8A2xf28dH/AGY5rfQ9M0xfEni6eLzm
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Gvwm/Z+/bt+KXwGvre2tNYfxD4YjO0aFqrtJCiE5xE2d0Z64wcc8g1+qv7L/AO2l
4M/aYsmtrLfofieCPzLjRbxgz7R1eJxgOufoR3ArrRxOPKfil4s8U6h431a/8R6/
qEmp6rqM7TXFxOfmkc8Z/wAAOABgVwF9O00p2AKBwPVf8K3b/TxZ26HeXkBBd2Pf
oMDsMVz9s3nk8cE96k6FpqT6aWWO4hY9VyOe3f8AnTDaqAcKARyMCtO10/eQyqM9
DVyTTxFC52YIU81ViucyUswsKEDHrQl0VtmtQp3Mcs2eK3be1BijXAPGOlVbqzEU
hOwc9aklSZWs4WVwCCMeleh/DDx3q/wu8aaP4r0Cf7PqmmziaM87Txgqw7qykqR6
E157DqAs5VDruQnGe4rorF4riISRNuU1orGT11P/2Q==
-----END CERTIFICATE-----
Further Reading
An A-Z Index of the Windows CMD command line - An excellent reference for all things Windows cmd line related.
certutil - Dump and display certification authority (CA) configuration information, configure Certificate Services, back up and restore CA components, verify certificates, key pairs or certificate chains.

Answer 2

You can use the command HEX2PNG.EXE to reconstruct a text file to an image.
Example :
smiley.txt
--------------#####--------------
-----------###.....###-----------
---------##...........##---------
-------##...............##-------
------#...................#------
-----#.....................#-----
----#...####........#####...#----
----#..####c#......####cc#..#----
---#..#####cc#....#####ccc#..#---
---#..#####cc#....#####ccc#..#---
--#...####ccc#....####cccc#...#--
--#..#cccccccc#..#ccccccccc#..#--
--#..#cccccccc#..#ccccccccc#..#--
-#...#cccccccc#..#ccccccccc#...#-
-#...##########..###########...#-
-#.............................#-
-#.............................#-
-#.............................#-
--#..#######################..#--
--#..#aaaaaaaaaaaaaaaaaaaaa#..#--
--#..#aaaaaaaaaaaaaaaaaaaaa#..#--
---#..#aaaaaaaaaaaaaaaaaaa#..#---
---#..#aaaaaaaaaaa;;;;aaaa#..#---
----#..#aaaaaaaaa;;;;;;aa#..#----
----#...#aaaaaaa;;;;;;;;#...#----
-----#...##aaaa;;;;;;;##...#-----
------#....###;;;;;###....#------
-------##.....#####.....##-------
---------##...........##---------
-----------###.....###-----------
--------------#####--------------
To build the image you have to replace each kind of char with an hexa color and then run hex2png.exe against the smileuout.txt :
In this case
The char [c] with white [FFFFFFFF]
The char [a] with maroon [103E66FF]
The char [.] with yellow [00EAFFFF]
The char [-] with transparent (black + transparent value to 00) [00000000]
The char [#] with black (non transparent) [000000FF]
The char [;] with red [0000FFFF]
This bat will do that :
#echo off
set $fichier=smiley.txt
set $taille=33;31
set $TotPix=1023
set $Fsortie=smiley.png
:::Crátion de la première ligne de sortie.txt (width_pixel;Height_pixel;Name_of_file.PNG;Total_number_of_pixel)
echo %$taille%;%$Fsortie%;%$TotPix%>SmileyOut.txt
setlocal enabledelayedexpansion
for /f "delims=" %%a in ('type %$fichier%') do (echo %%a
set $ligne=%%a
set $ligne=!$ligne:c=FFFFFFFF !
set $ligne=!$ligne:a=103E66FF !
set $ligne=!$ligne:.=00EAFFFF !
set $ligne=!$ligne:-=00000000 !
set $ligne=!$ligne:#=000000FF !
set $ligne=!$ligne:;=0000FFFF !
set /a $c+=1
for %%b in (!$ligne!) do (echo %%b>>SmileyOut.txt))
endlocal
hex2pngV1.3.exe smileyout.txt
del smileyout2>nul
start smiley.png
The output will be this nice smiley :
The structure of the file smiley.txt is very important !
This vars must be setted correctly or the image will be corrupted :
$fichier=smiley.txt
$taille=33;31 => width;height of the output file each char is one pixel
$TotPix=1023 => The total of pixel (width * height)
$Fsortie=smiley.png => the name of the output PNG
The command PNG2HEX will do exactly the contrary an generate a txt file from an image !