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GetSystemInfo (kernel32)
Retrieves information about the current system

C# Signature:

[DllImport("kernel32.dll", SetLastError=true)]

internal static extern void GetSystemInfo(ref SYSTEM_INFO Info);

User-Defined Types:

    internal struct SYSTEM_INFO
    internal ushort wProcessorArchitecture;
    internal ushort wReserved;
    internal uint dwPageSize;
    internal IntPtr lpMinimumApplicationAddress;
    internal IntPtr lpMaximumApplicationAddress;
    internal IntPtr dwActiveProcessorMask;
    internal uint dwNumberOfProcessors;
    internal uint dwProcessorType;
    internal uint dwAllocationGranularity;
    internal ushort wProcessorLevel;
    internal ushort wProcessorRevision;


Alternative Managed API:

To determine whether the OS or Process is x64, using .NET 4, see System.Environment (Is64BitProcess, Is64BitOperatingSystem);

Sample Code:

    void Test()
        NativeMethods.GetSystemInfo(out info);


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