How to tell x64 from 32 bit via registry?

[SoulAssassin]

So I'm working on merging two scripts I wrote, both do the same thing but one is for x64 and one is for 32-bit...drops different binaries. Having a little trouble finding an automated method for determining the flavor of the OS. Best I can find is checking for HKEY_LOCAL_MACHINE\Software\WOW6432node and if it exists then it's x64, if not it's 32-bit. It will probably work but I don't think it's 'clean'.

Anyone know of a better way to determine if it's 32 or 64 bit?


not sure if it's better to post this in OS, software for Windows or programming...I reserve the right to cross post this if I don't get any responses here.

 

[Zach]

What about environment variables? PROCESSOR_ARCHITECTURE is what I've used.

 

[Zach]

You made me curious:

http://support.microsoft.com/default.aspx/kb/556009

There's a reg key also.

 

[Modelworks]

So I'm working on merging two scripts I wrote, both do the same thing but one is for x64 and one is for 32-bit...drops different binaries. Having a little trouble finding an automated method for determining the flavor of the OS. Best I can find is checking for HKEY_LOCAL_MACHINE\Software\WOW6432node and if it exists then it's x64, if not it's 32-bit. It will probably work but I don't think it's 'clean'.

Anyone know of a better way to determine if it's 32 or 64 bit?


not sure if it's better to post this in OS, software for Windows or programming...I reserve the right to cross post this if I don't get any responses here.

Easiest way of all is check for Program Files(x86) directory. It only exist on 64 bit.

 

[VirtualLarry]

Easiest way of all is check for Program Files(x86) directory. It only exist on 64 bit.

Unless someone installs Win7 32-bit over Win7 64-bit. The installer doesn't erase it.

 

[her209]

How about checking the CurrentVersion key located at:

HKLM\Software\Microsoft\Windows NT\Currentversion

I believe:

5.1 = Windows XP
5.2 = Windows XP x64

EDIT: Operating System Version

 

[SoulAssassin]

You made me curious:

http://support.microsoft.com/default.aspx/kb/556009

There's a reg key also.

Perfect, thanks. I think a few of the other ways would have worked but they were a little kludgey.