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ntquerysysteminformation (ntdll)
 
.
Summary
Retrieves the specified system information. Specify the information you want, a pointer to hold the results.

C# Signature:

/// <summary>Retrieves the specified system information.</summary>
/// <param name="InfoClass">indicate the kind of system information to be retrieved</param>
/// <param name="Info">a buffer that receives the requested information</param>
/// <param name="Size">The allocation size of the buffer pointed to by Info</param>
/// <param name="Length">If null, ignored.  Otherwise tells you the size of the information returned by the kernel.</param>
/// <returns>Status Information</returns>
/// http://msdn.microsoft.com/en-us/library/windows/desktop/ms724509%28v=vs.85%29.aspx
[DllImport("ntdll.dll", SetLastError = false)]
public static extern NtStatus NtQuerySystemInformation(SYSTEM_INFORMATION_CLASS InfoClass, IntPtr Info, UInt32 Size, out UInt32 Length);

NtQuerySystemInformation!!!!VB Signature:

Declare Function NtQuerySystemInformation Lib "ntdll.dll" (TODO) As TODO

User-Defined Types:

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

public void Test()
{  
    UInt32
        result = 0;

    NativeMethods.SYSTEM_MEMORY_LIST_INFORMATION
        MemoryList;

    UInt32
        returnSize;

    Int32[]
        arr = new Int32[] { (Int32)Commands.MEMORYLIST };

    IntPtr
        buff = Marshal.AllocHGlobal(1024); // should be more than adequate
    try
    {
        result = (UInt32)NativeMethods.NtQuerySystemInformation(NativeMethods.SYSTEM_INFORMATION_CLASS.SystemMemoryListInformation, buff, result, out returnSize);
        if (result != 0)
            // Most likely error is InfoLengthMismatch = 0xc0000004 -- meaning you need to make the buffer larger
            throw new System.ComponentModel.Win32Exception(((NativeMethods.NtStatus)result).ToString());
        if (NativeMethods.SYSTEM_MEMORY_LIST_INFORMATION_SIZE == 0)
            NativeMethods.SYSTEM_MEMORY_LIST_INFORMATION_SIZE = returnSize;
        MemoryList = (NativeMethods.SYSTEM_MEMORY_LIST_INFORMATION)Marshal.PtrToStructure(buff, typeof(NativeMethods.SYSTEM_MEMORY_LIST_INFORMATION));
    }
    finally
    {
        Marshal.FreeHGlobal(buff);
    }
}

Documentation

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