Batch File: If registry key’s data is equal to


I'm trying to make a .bat toggler for certain Explorer settings. To do this I need the batch file to query the Registry key's data and then set the key accordingly. For example, in ActionScript 3 or JavaScript it would be something along the lines of this:

if (HideFileExt == "00000000"){
    HideFileExt = 00000001;
else {
    HideFileExt = 00000000;

This way, every time it runs it will set the key's data to be the opposite of what it currently is – a toggler.

I have Google-d this extensively and after quite a long time of chopping up and splicing multiple examples, I eventually got this:

REG QUERY HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v HideFileExt /t REG_DWORD /d 00000000

if errorlevel 1 (
    echo Num 1
) else (
    echo Num 2

rem The "echo Num"s are there just so that I could eventually figure out what the errorlevel does

which returns the error:

ERROR: Invalid syntax.
Type "REG QUERY /? for usage.
num 1

If I remove the /d 00000000 from the REG QUERY then it returns the accurate data value of the key without error. I have also tried it with /d 0, /d 0x0 and /d 0x00000000 and they didn't work either.

Best Solution

The /d switch doesn't do what you think. It is a modifier to the /f switch, which is used to specify a search pattern. Unfortunately, /v already defines a search pattern, and they do not get along.

To check whether HideFileExt is set to 0, you can pipe reg's result to find:

reg query HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v HideFileExt | find "0x0"
if errorlevel 1 echo "HideFileExt is 0"
if errorlevel 0 echo "HideFileExt is not 0"