pinvoke.net: Edit: kernel32.VirtualQueryEx

@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ 
@pinvoke=http://pinvoke.net/$$$.htm

Summary: The VirtualQueryEx API

!!!!C# Signature: 
	[DllImport("kernel32.dll")] 
	static extern int VirtualQueryEx(IntPtr hProcess, IntPtr lpAddress, out MEMORY_BASIC_INFORMATION lpBuffer, uint dwLength); 
!!!!Boo Signature:
 [DllImport("kernel32.dll", SetLastError : true)]
 def VirtualQueryEx(hProcess as IntPtr, lpAddress as IntPtr, ref lpBuffer as MEMORY_BASIC_INFORMATION, dwLength as UIntPtr) as UIntPtr:
     pass
!!!!C# User-Defined Types: 
[MEMORY_BASIC_INFORMATION] 
	[StructLayout(LayoutKind.Sequential)] 
	public struct MEMORY_BASIC_INFORMATION 
	{ 
		public IntPtr BaseAddress; 
		public IntPtr AllocationBase; 
		public uint AllocationProtect; 
		public IntPtr RegionSize; 
		public uint State; 
		public uint Protect; 
		public uint Type; 
	}

For querying 64bit applications, use the following structure: 
	[StructLayout(LayoutKind.Sequential)] 
	public struct MEMORY_BASIC_INFORMATION64 
	{ 
		public ulong BaseAddress; 
		public ulong AllocationBase; 
		public int AllocationProtect; 
		public int __alignment1; 
		public ulong RegionSize; 
		public int State; 
		public int Protect; 
		public int Type; 
		public int __alignment2; 
	}

!!!!c# usefull Flags for MEMORY_BASIC_INFORMATION 
[Flags] 
	public enum AllocationProtect : uint 
	{ 
		PAGE_EXECUTE = 0x00000010, 
		PAGE_EXECUTE_READ = 0x00000020, 
		PAGE_EXECUTE_READWRITE = 0x00000040, 
		PAGE_EXECUTE_WRITECOPY = 0x00000080, 
		PAGE_NOACCESS = 0x00000001, 
		PAGE_READONLY = 0x00000002, 
		PAGE_READWRITE = 0x00000004, 
		PAGE_WRITECOPY = 0x00000008, 
		PAGE_GUARD = 0x00000100, 
		PAGE_NOCACHE = 0x00000200, 
		PAGE_WRITECOMBINE = 0x00000400 
	}

!!!!Notes: 
VirtualQueryEx returns 0 on failure.

!!!!Tips & Tricks: 
Please add some!

!!!!Sample Code: 
The following code demonstrates how to list all regions within a process' memory address.

long MaxAddress = 0x7fffffff; 
 long address = 0; 
 do 
 { 
	MEMORY_BASIC_INFORMATION m; 
	int result = VirtualQueryEx(System.Diagnostics.Process.GetCurrentProcess().Handle, (IntPtr)address, out m, (uint)Marshal.SizeOf(typeof(MEMORY_BASIC_INFORMATION))); 
	Console.WriteLine("{0}-{1} : {2} bytes result={3}", m.BaseAddress, (uint)m.BaseAddress + (uint)m.RegionSize - 1, m.RegionSize, result); 
	if (address == (long)m.BaseAddress + (long)m.RegionSize) 
		break; 
	address = (long)m.BaseAddress + (long)m.RegionSize; 
 } while (address <= MaxAddress);

!!!!Alternative Managed API: 
Do you know one? Please contribute it!

Documentation: VirtualQueryEx@msdn on MSDN