How to determine if we are running on 64 or 32 bit?
In my work I need to be able to pick different files depending on if I run in 64 bit or 32 bit system. The first thing I did try was to use the size of IntPtr which is 4 for 32 bit and 8 for 64 bit. But since I was using the visual studio unit test framework it did not work that god. The unit test framework run in a 32 bit process but the application I’m testing is running in 64 bit, so decided to use P/Invoke to call GetNativeSystemInfo.
The structure that you get is according to
[StructLayout(LayoutKind.Sequential)] private struct SystemInfoNative { internal ushort ProcessorArchitecture; internal ushort Reserved; internal uint PageSize; internal IntPtr MinimumApplicationAddress; internal IntPtr MaximumApplicationAddress; internal IntPtr ActiveProcessorMask; internal uint NumberOfProcessors; internal uint ProcessorType; internal uint AllocationGranularity; internal ushort ProcessorLevel; internal ushort ProcessorRevision; } |
Out from this you can check the processor architecture.
And the complete source code
using System; using System.Runtime.InteropServices; namespace SystemInfoTesting { internal sealed class SystemInfo { public enum ProcessorArchitecture { None = -1, Intel = 0, IA64 = 6, AMD64 = 9 } private SystemInfoNative nativeInfo; private SystemInfo(SystemInfoNative nativeInfo) { this.nativeInfo = nativeInfo; } public ProcessorArchitecture Architecture { get { return (ProcessorArchitecture)Enum.Parse(typeof(ProcessorArchitecture), Enum.GetName(typeof(ProcessorArchitecture), this.nativeInfo.ProcessorArchitecture)); } } public static SystemInfo GetNativeSystemInfo() { SystemInfoNative native = new SystemInfoNative(); GetNativeSystemInfo(ref native); return new SystemInfo(native); } [StructLayout(LayoutKind.Sequential)] private struct SystemInfoNative { internal ushort ProcessorArchitecture; internal ushort Reserved; internal uint PageSize; internal IntPtr MinimumApplicationAddress; internal IntPtr MaximumApplicationAddress; internal IntPtr ActiveProcessorMask; internal uint NumberOfProcessors; internal uint ProcessorType; internal uint AllocationGranularity; internal ushort ProcessorLevel; internal ushort ProcessorRevision; } [DllImport("kernel32.dll")] private static extern void GetNativeSystemInfo(ref SystemInfoNative lpSystemInfo); } } |
