C# Signature:
[DllImport("kernel32.dll", SetLastError=false)]
public static extern void GetSystemInfo(out SYSTEM_INFO Info);
User-Defined Types:
public enum ProcessorArchitecture
{
X86 = 0,
X64 = 9,
@Arm = -1,
Itanium = 6,
Unknown = 0xFFFF,
}
[StructLayout(LayoutKind.Sequential)]
public struct SystemInfo
{
public ProcessorArchitecture ProcessorArchitecture; // WORD
public uint PageSize; // DWORD
public IntPtr MinimumApplicationAddress; // (long)void*
public IntPtr MaximumApplicationAddress; // (long)void*
public IntPtr ActiveProcessorMask; // DWORD*
public uint NumberOfProcessors; // DWORD (WTF)
public uint ProcessorType; // DWORD
public uint AllocationGranularity; // DWORD
public ushort ProcessorLevel; // WORD
public ushort ProcessorRevision; // WORD
}
better c# structure[s]:
[StructLayout(LayoutKind.Explicit)]
public struct SYSTEM_INFO_UNION
{
[FieldOffset(0)]
public UInt32 OemId;
[FieldOffset(0)]
public UInt16 ProcessorArchitecture;
[FieldOffset(2)]
public UInt16 Reserved;
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct SYSTEM_INFO
{
public SYSTEM_INFO_UNION CpuInfo;
public UInt32 PageSize;
public UInt32 MinimumApplicationAddress;
public UInt32 MaximumApplicationAddress;
public UInt32 ActiveProcessorMask;
public UInt32 NumberOfProcessors;
public UInt32 ProcessorType;
public UInt32 AllocationGranularity;
public UInt16 ProcessorLevel;
public UInt16 ProcessorRevision;
}
Alternative Managed API:
To determine whether the OS or Process is x64, using .NET 4, see System.Environment (Is64BitProcess, Is64BitOperatingSystem); http://msdn.microsoft.com/en-us/library/z8te35sa.aspx
Sample Code:
void Test()
{
NativeMethods.SYSTEM_INFO
info;
NativeMethods.GetSystemInfo(out info);
}
