Determining 64-bit vs. 32-bit Windows

Question

I'd like to configure visual studio 2005 to copy .dll's based on whether the OS is 64-bit or 32-bit during a build.

I do not want to specify what the platform target is.

My first attempt was to use a batch file to lookup the Windows version, but some 32-bit and 64-bit versions of Windows share the same version number.

Anyone know of any way to check this?

Thanks!

Answer 1

You should be able to read the environment variable %PROCESSOR_ARCHITECTURE%. Here is some great information on it.

http://blogs.msdn.com/david.wang/archive/2006/03/26/HOWTO-Detect-Process-Bitness.aspx

Answer 2

Check out isWow64, I think that shopuld give you what you are after.

Determines whether the specified process is running under WOW64.

Answer 3

Jon's link is a total hack because it relies upon no new processor architectures being added.

See: http://support.microsoft.com/kb/556009 for the "official" batch file method.