C# Signature:

    [DllImport("kernel32.dll")]
    static extern bool VirtualQueryEx(IntPtr hProcess, uint lpAddress, out MEMORY_BASIC_INFORMATION lpBuffer, uint dwLength);

C# User-Defined Types:

MEMORY_BASIC_INFORMATION

    [StructLayout(LayoutKind.Sequential)]
    public struct MEMORY_BASIC_INFORMATION
    {
    public uint BaseAddress;
    public uint AllocationBase;
    public uint AllocationProtect;
    public uint RegionSize;
    public uint State;
    public uint Protect;
    public uint Type;
    }

Notes:

VirtualQueryEx returns 0 on failure.

Tips & Tricks:

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Sample Code:

The following code demonstrates how to list all regions within a process' memory address.
uint MaxAddress = 0x7fffffff;
uint address = 0;
do
{
    MEMORY_BASIC_INFORMATION m = new MEMORY_BASIC_INFORMATION();
    int result = VirtualQueryEx(System.Diagnostics.Process.GetCurrentProcess().Handle, address, out m, Marshal.SizeOf(m));
    Console.WriteLine("{0}-{1} : {2} bytes result={3}", m.BaseAddress, (uint)m.BaseAddress + (uint)m.RegionSize, m.RegionSize,result);
    address = (uint)m.BaseAddress + (uint)m.RegionSize;
} while (address <= MaxAddress);

Alternative Managed API:

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