pinvoke.net: Edit: kernel32.virtualalloc

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@pinvoke=http://pinvoke.net/$$$.htm

Summary: The VirtualAllocEx API

!!!!C# Signature:
 [DllImport("kernel32.dll", SetLastError=true, ExactSpelling=true)]
 static extern IntPtr VirtualAllocEx(IntPtr hProcess, IntPtr lpAddress,
   IntPtr dwSize, AllocationType flAllocationType, MemoryProtection flProtect);

!!!!C# Signature:
  [DllImport("kernel32")]
  public static extern IntPtr VirtualAlloc(IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect);

!!!!C# Signature:
        [DllImport("kernel32.dll", SetLastError = true, ExactSpelling = true)]
        static extern IntPtr VirtualAllocEx(IntPtr hProcess, 
                                            IntPtr lpAddress,
                                            int dwSize, 
                                            AllocationType flAllocationType, 
                                            MemoryProtection flProtect);
!!!!VB.NET Signature:
 <DllImport("kernel32.dll", SetLastError:=True, ExactSpelling:=True)> _
 Private Function VirtualAllocEx(ByVal hProcess As IntPtr, ByVal lpAddress As IntPtr, _
     ByVal dwSize As IntPtr, ByVal flAllocationType As UInteger, _
     ByVal flProtect As UInteger) As IntPtr
 End Function

!!!!VBA Signature:
 Private Declare PtrSafe Function VirtualAlloc Lib "KERNEL32.dll" _
 (ByVal lpAddress As LongPtr, ByVal dwSize As LongPtr, ByVal flAllocationType As Long, ByVal flProtect As Long) As LongPtr

!!!!Boo Signature:
 [DllImport("kernel32.dll")]
 def VirtualAllocEx(hProcess as IntPtr, lpAddress as IntPtr, dwSize as UInt32, flNewProtect as UInt32, lpflOldProtect as UInt32) as IntPtr:
     pass
!!!!User-Defined Types:
 [Flags]
 public enum AllocationType
 {
     Commit = 0x1000,
     Reserve = 0x2000,
     Decommit = 0x4000,
     Release = 0x8000,
     Reset = 0x80000,
     Physical = 0x400000,
     TopDown = 0x100000,
     WriteWatch = 0x200000,
     LargePages = 0x20000000
 }

[Flags]
 public enum MemoryProtection
 {
     Execute = 0x10,
     ExecuteRead = 0x20,
     ExecuteReadWrite = 0x40,
     ExecuteWriteCopy = 0x80,
     NoAccess = 0x01,
     ReadOnly = 0x02,
     ReadWrite = 0x04,
     WriteCopy = 0x08,
     GuardModifierflag = 0x100,
     NoCacheModifierflag = 0x200,
     WriteCombineModifierflag = 0x400
 }

!!!!Notes:
None.

!!!!Tips & Tricks:
You can get the dwSize in C# with sizeof(TYPE) for blittable types or Marshal.SizeOf(typeof(TYPE)) for non-blittable types

!!!!Sample Code:
            IntPtr allocatedBaseAddress = VirtualAllocEx(process.Handle, IntPtr.Zero, buffer.Length, AllocationType.Commit | AllocationType.Reserve, MemoryProtection.ExecuteReadWrite);

!!!!Alternative Managed API:
The ManagedWindowsApi project (http://mwinapi.sourceforge.net) provides a ProcessMemoryChunk class to allocate and access memory of a different process.

Documentation: VirtualAllocEx@msdn on MSDN