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    public static extern void GetSystemInfo(out SYSTEM_INFO lpSystemInfo);

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    Declare Function GetSystemInfo Lib "coredll.dll" (ByVal lpSystemInfo AS SYSTEM_INFO)

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    [DllImport("kernel32", EntryPoint = "GetSystemInfo", SetLastError = true)]

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    public static extern void GetSystemInfo30(out SYSTEM_INFO_WCE30 pSi);

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    [DllImport("kernel32", EntryPoint = "GetSystemInfo", SetLastError = true)]

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    public static extern void GetSystemInfo50(out SYSTEM_INFO_WCE50 pSi);

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        GetSystemInfo50(out si);

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        GetSystemInfo30(out si);

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Documentation

[GetSystemInfo] on MSDN

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        GetSystemInfo(si)

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        Win32API.GetSystemInfo(ref sysinfo);

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    internal static extern void GetSystemInfo([MarshalAs(UnmanagedType.Struct)] ref SYSTEM_INFO lpSystemInfo);

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        Win32API.GetSystemInfo(ref sysinfo);

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    internal static extern void GetSystemInfo([MarshalAs(UnmanagedType.Struct)] ref SYSTEM_INFO lpSystemInfo);

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Summary

Returns os info. This api can be used in a x86 process to determine if the os supports 64bit. This api is only supported on XP and higher. On lower os versions use GetSystemInfo.

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GetSystemInfo

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    internal static extern void GetSystemInfo(ref SYSTEM_INFO lpSystemInfo);

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    GetSystemInfo(ref sysInfo);

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public static extern void GetSystemInfo(out SYSTEM_INFO Info);

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        NativeMethods.GetSystemInfo(out info);

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Documentation

[GetSystemInfo] on MSDN

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        GetSystemInfo(si)

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It is recommended that VirtualAlloc be used to allocate an unmanaged block of memory for use with this function. The array of file segments can be effeciently constructed without heap allocation using stackalloc. You will need to get the system's page size through a call to GetSystemInfo.

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// The size of each buffer (ASize) must be a multiple of the system's page size (get using GetSystemInfo)

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It is recommended that VirtualAlloc be used to allocate an unmanaged block of memory for use with this function. The array of file segments can be effeciently constructed without heap allocation using stackalloc. You will need to get the system's page size through a call to GetSystemInfo.

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// The size of each buffer (ASize) must be a multiple of the system's page size (get using GetSystemInfo)

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It is recommended that VirtualAlloc be used to allocate an unmanaged block of memory for use with this function. The array of file segments can be effeciently constructed without heap allocation using stackalloc. You will need to get the system's page size through a call to GetSystemInfo.

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// The size of each buffer (ASize) must be a multiple of the system's page size (get using GetSystemInfo)