China DOS Union

```
@echo off&setlocal enabledelayedexpansion
title Drive Hiding
:setvar
set needhidedrv=Not entered yet.
set value=0
set str=A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

:HIDEDRV
cls
set n=1
set drv=endinput
echo The drives that need to be hidden that have been entered:
echo ===============================================================================

echo.

echo.
echo %needhidedrv%
echo.

echo.
echo ===============================================================================

echo.
echo For example, if you need to hide drive C, please enter c or C, then press Enter. If you need to enter multiple drive letters, continue to enter. If you want to complete the input, just press Enter directly. Enter all to hide all. In the initial state, pressing Enter directly will cancel the hiding
echo.&echo.&echo.&echo.&echo.&echo.&echo.&echo.&echo.
set /p drv=Please enter:
if "%drv%"=="endinput" goto exec
if "%drv%"=="all" set value=0X3FFFFFF&goto exec
if "%needhidedrv%"=="Not entered yet." set needhidedrv=
for %%i in (%str%) do call set drv=%%drv:%%i=%%i%%
for %%i in (%needhidedrv%) do (if "%drv%"=="%%i" goto HIDEDRV)
for %%i in (%str%) do if "%drv%"=="%%i" (goto :next) else (set /a n=n+n)
if "%needhidedrv%"=="" set needhidedrv=Not entered yet.
goto HIDEDRV
:next
set needhidedrv=%needhidedrv%%drv%
set /a value=%value%+%n%
goto HIDEDRV

:exec
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer /f /v NoDrives /t REG_DWORD /d %value%
taskkill /f /im explorer.exe >nul & start explorer &cls
echo Operation completed, press any key to exit
pause>nul
exit&exit
```

Note: The core code is three for statements. The first one is used to convert lowercase to uppercase. The second one is used to judge whether the input is repeated. The third one is used to assign a value to each drive letter.

Special thanks to netbenton and the elder brother who gave an example code.
Thank you very much, netbenton. You made me realize a new step.
Regarding replying with gpupdate, my antivirus software will give an alarm...
============Moderator, please see my follow-up post

[ Last edited by darkkid on 2009-4-15 at 22:07 ]

Never did I dream that I could write such a long piece of code

New user post, add points for encouragement.
It is suggested that the original poster can try to shorten this code of more than 300 lines to within 100 lines.

This can save multiple if...goto and multiple for...judgments to see if it has been input before

set "str= a b c d e f g h i j k l m n o p q r s t u v w x y z "
if not "!str: %drv% =!"=="!str!" (
if not "!ain: %drv% =!"=="!ain!" (set "ain=%ain% %drv% "&goto :part%drv%)
)

The correspondence between drive letters and numbers is:
a 1
b 2
c 4
d 8
e 16
f 32
g 64
h 128
...

In this way, the corresponding value can be obtained:
set n=1
for %%a in (%str%) do if "%drv%"=="%%a" (goto :ok) else (set/a n=n+n)
:ok
Then try to convert it to hexadecimal, which can save the practice of multiple branches.

With the above method, the code can be controlled within 50 lines
The 楼主 can give it a try

[ Last edited by netbenton on 2009-4-13 at 06:15 ]

Back to netbenton

Got your idea.

At the current stage, it's difficult for me to understand your code. I'll take my time to figure it out.

[ Last edited by darkkid on 2009-4-13 at 08:26 ]

Collected a long time ago
@echo off :inp cls set Drv= echo Enter the number "0" to unhide, enter several letters to hide the corresponding disks. set/p Drv=Enter disk (e.g.: EaF)- if "%Drv%"=="" goto :inp if %Drv%==0 set TT=00&goto :hidrv ::Convert lowercase to uppercase and output in order and remove duplicates set mat=A B C D E F G H I J K L M N O P Q R S T U V W X Y Z for %%d in (%mat%) do ( 　call set _%%d= ) :lp if not defined _%Drv:~,1% set "_%Drv:~,1%=1" set "Drv=%Drv:~1%" if defined Drv goto lp set n=1 set n10= set Dnum= for %%m in (%mat%) do ( 　call :setn n 　if defined _%%m ( 　　call :sshow %%m Drv Dnum n2 n10 　) ) ::Display echo. echo The disks to hide are %Drv%, total disks. ::Convert to hexadecimal :reg16 setlocal enableDelayedExpansion call :A %n10% ::Registry binary value expression ::T3 to BIN set TT= :bi set/a x+=1 set Tn=0%T3:~-2% set Tn=!Tn:~-2! set T3=%T3:~,-2% set TT=!TT!!Tn! if not #%T3%==# goto :bi ::Hide disk ::-=Core code=- :hidrv set TT=%TT%000000 reg add HKCU\SoftWare\Microsoft\Windows\CurrentVersion\Policies\Explorer /v NoDrives /t REG_BINARY /d %TT:~,8% /f echo End explorer process to take effect. Press any key to end and open My Computer to view pause>nul taskkill /f /im explorer.exe>nul endlocal start/min "" explorer "%~dp0" start explorer ::{20D04FE0-3AEA-1069-A2D8-08002B30309D} ping -n 3 127.1>nul goto :eof ::Call label :sshow 　set %2=%Drv%%1 　set/a %3+=1 　set/a %4=n/2 　set/a %5+=n2 　goto :eof :setn 　set/a %1*=2 　goto :eof :A 　set str=0123456789ABCDEF 　set T1=%1 　SET T3= :B 　set/A T2=T1%%16 　SET T2=!str:~%t2%,1! 　SET/A T1=%T1%/16 　SET T3=%T2%%T3% 　IF %T1%==0 GOTO :EOF 　GOTO B

Reply to zh159:

It's really an honor that someone has bookmarked this code. Truly, truly honored.

Not bad, newbie, add points,

Actually, I'm not that "old" either. Hehe

You can try to hide your system disk... It has a very good effect... Anyway, I have tried it... Even opening web pages can't be opened. Friends who are interested can

A rough look-through, and a few questions are raised:

:: Explanation, the function of this batch processing is to hide the disk drive letters in Windows Explorer, which protects personal privacy to a certain extent. Anyone can edit this batch processing with Notepad to make its function more powerful and more efficient. Xiaomin, April 12, 2009, sharing here for learning batch processing well.
@echo off&setlocal enabledelayedexpansion
:setvar
set needhidedrv=Not yet entered.
set value=0
set str=A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
set n=1

:HIDEDRV
::::::::::::Besides the @ before echo off, so many @ are used. Is it for fun? Or something else?
@cls
set drv=endinput
@echo The drive letters that have been entered to hide:
@echo ===============================================================================
@echo.
@echo.
@echo %needhidedrv%
@echo.
@echo.
@echo ===============================================================================
@echo.
@echo For example, if you need to hide C drive, enter c or C, press Enter. If you need to enter multiple drive letters, continue input. If you want to complete input, just press Enter. Enter all to hide all, press Enter to cancel hide.
@echo.&@echo.&@echo.
set /p drv=Please input:
::::::::::::If user input a double quote, code abnormal.
if "%drv%"=="endinput" goto exec
if "%drv%"=="endinput" goto exec
if "%needhidedrv%"=="Not yet entered." set needhidedrv=
for %%i in (%str%) do call set drv=%%drv:%%i=%%i%%
::::::::::::Add /i to below if to ignore case. Above for redundant?
for %%i in (%needhidedrv%) do (if "%drv%"=="%%i" goto HIDEDRV)
for %%i in (%str%) if "%drv%"=="%%i" (set needhidedrv's %%drv) set /a value=value+n
goto next
:next
set needhidedrv=%needhidedrv%%drv%
exec@cls
reg delete HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer /f /v NoDrives
::::::::::::reg add overwrite. Above reg delete redundant?
reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer /f /v NoDrives /t REG_DWORD /d %value%
taskkill /f /IM explorer.exe >nul
start explorer.exe
@echo Operation complete, press any key exit
pause>nul
exit&exit

You can use gpupdate.exe /force instead of restarting the explorer.exe process.

Fixed a small error by moving set n=1 outside of :hidedrv, which caused incorrect assignments for all but the first drive when hiding multiple drives. Thanks to tireless here as well.

The following is in response to moderator HAT:

First, regarding the @ symbol, it's optional in my code. You can delete it if you find it obtrusive since I already have echo off on the first line. Adding @ before each line is equivalent to echo off.

The input anomaly you mentioned should be when entering for the first time, showing echo message as off? Actually, it's not a big deal. All strings other than abcdefg... will have this issue, and it's completely fine to ignore it. It's mainly a legacy from my initial display of "No input yet". When I clear the display list, echo can't display an empty string.

Regarding my case conversion, well, I said I'm a bit of a newbie. I didn't know about this parameter in if. Thanks to the moderator for the instruction. If I want to use this parameter, changing my str's uppercase A B C D... to lowercase a b c d... will make it run, but it won't look as nice when running, showing all lowercase. I won't change it; I prefer it to be nicer looking.


Finally, the last "no it" is just because I didn't know.

Now I need to go to school, and internet access is not convenient. I'll work on it again when I get home on the weekend

Regarding the issue of users entering a double quote, come back to discuss it when you encounter a situation where you can't ignore it in the future. For now, just use it as you insist.

Entering double quotes is at least okay here, analyze specific problems specifically, we'll calculate then.