Need help in finding the root cause in this wrong batch command

IF %processor_architecture% == AMD64 (SET querypath=hkl开发者_如何学Gom\software\x) ELSE (SET dsetquerypath=hklm\software\y)

FOR /F "tokens=* delims=\" %%G IN ('REG QUERY "%querypath%" 2^>NUL') DO ECHO %%G

Let me explain what im trying to accomplish out of this batch command. Basically there is a tool which gets intalled on hklm\software\x(on 32bit windows) and hklm\software\y(on 64 bit windows).

I need the exact path of the software from registry.Which could tell me whether the machine is 32 or 64 bit and take appropriate action. But right now every time I using this batch command it is always returning path as hklm\software\y.

I don't know WHY? That is what I need help to make this batch file right.

EDIT: I think this may provide an explanation and solution to your problem, and in batch too :)

The spaces around the == may be causing your problem.

You're actually comparing the value of %processor_architecture%[space] to [space]AMD64

Try:

IF %processor_architecture%==AMD64...

If Command Extensions are enabled you can also do:

IF /I %processor_architecture% equ AMD64

(the /I switch makes the IF case insensitive)

It works as expected if AMD64 is quoted:

set processor_architecture="AMD64"
IF %processor_architecture% == "AMD64" (SET querypath=hklm\software\x) ELSE > (SET  querypath=hklm\software\y)
echo querypath=%querypath%

What about this:

ECHO processor_architecture="%processor_architecture%"
SET querypath=hklm\software\y
IF "%processor_architecture%" == "AMD64" SET querypath=hklm\software\x

Also note you have some typos on your ELSE part; isn't the problem there?

I think you are falling victim to the phenomenon where the variables are expanded/evaluated as soon as they are read. There is a good discussion of that at Raymond Chen's blog.

Also search on "immediate expansion" and "delayed expansion".