How can I tell whether I am on x64 or x86 using .NET?

views:

1154

answers:

+3 Q:

How can I tell whether I am on x64 or x86 using .NET?

I'd like to offer my users correct links to an upgraded version of my program based on what platform they're running on, so I need to know whether I'm currently running on an x86 OS or an x64 OS.

The best I've found is using Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE"), but I would think there would be some built-in facility for this?

Check the size of IntPtr with Marshal.SizeOf. 32 bit = 4 bytes, 64 bit = 8 bytes.

Edit: I am not sure this is what you are looking for after reading the question again.

leppie 2008-09-18 08:10:25

This would differentiate between a 32-bit and a 64-bit platform, although the 64-bit platform could be, say, Itanium and not x64. (Unlikely, I know, but possible.)

millenomi 2008-09-18 08:22:15

You don't need to use Marshal.SizeOf, you can just use IntPtr.Size

Wilka 2008-11-17 15:32:36

-1: This tells whether this .NET process is x64

Ruben Bartelink 2009-12-10 14:03:50

Check just IntPtr.Size . You need to have target platform as AnyCPU.

from here

Jakub Kotrla 2008-09-18 08:27:37

-1: Duplicate of Leppie's answer (and wrong for same reason)

Ruben Bartelink 2009-12-10 14:04:27

(I realise its different, but the best place to point that out is in a comment on the other answer. But I also realize that there probably werent even comments back in the day and/or you didnt have enough rep to make them...)

Ruben Bartelink 2009-12-10 14:08:57

+3 A:

Call IsWow64Process to find out if your 32-bit process is running in WOW64 on a 64-bit operating system. You can call GetNativeSystemInfo to find out exactly what it is: the wProcessorArchitecture member of SYSTEM_INFO will be PROCESSOR_ARCHITECTURE_INTEL for 32-bit, PROCESSOR_ARCHITECTURE_AMD64 for x64 and PROCESSOR_ARCHITECTURE_IA64 for Intel's Itanium.

Mike Dimmick 2008-09-18 14:33:17

+1: Explicit about what each call does, not misleading

Ruben Bartelink 2009-12-10 14:05:20

You can determine a lot via environment variables as used in http://stackoverflow.com/questions/194157/c-how-to-get-program-files-x86-on-vista-x64/194223#194223 [And this happened to suit me better than Mike's answer which I +1'd as I happen to be interested in finding the Program Files directory name]

Ruben Bartelink 2009-12-10 14:20:04

+3 A:

Environment.Is64BitOperatingSystem and Environment.Is64BitProcess are being introduced in .NET 4. For .NET 2 you'll need to try out some of the other answers.

Richard Szalay 2009-12-10 14:26:07

ansaurus

tags:

views:

answers:

How can I tell whether I am on x64 or x86 using .NET?

related questions