pinvoke.net: Edit: kernel32.zeromemory

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

Summary: The ZeroMemory function fills a block of memory with zeros.

!!!!C# Signature:
 [DllImport("Kernel32.dll", EntryPoint="RtlZeroMemory", SetLastError=false)]
 static extern void ZeroMemory(IntPtr dest, IntPtr size);

!!!!VB Signature:
 Declare Auto Sub ZeroMemory Lib "Kernel32.dll" _
	Alias "RtlZeroMemory" (ByVal dest As IntPtr, ByVal size As IntPtr)

!!!!VB.NET Signature:

<DllImport("kernel32.dll")> _
   Public Shared Sub ZeroMemory(ByVal addr As IntPtr, ByVal size As IntPtr)
   End Sub

!!!!User-Defined Types:
None.

!!!!Alternative Managed API:
Use Marshal.Copy() to copy an zero-filled managed array onto the unmanaged heap.

!!!!Notes:
VB developers might want to check the VB declaration thoroughly...

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

!!!!Sample Code:
    Imports System.Runtime.InteropServices
    Public Class Form1
    <DllImport("kernel32.dll")> _
    Public Shared Sub ZeroMemory(ByVal addr As IntPtr, ByVal size As IntPtr)
    End Sub

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Const elements As Integer = 50
        Dim bytearray(elements) As Byte ' has elements+1 bytes
        bytearray(0) = 1
        bytearray(elements - 1) = 2
        bytearray(elements) = 3
        Debug.Print(CStr(bytearray(0)) + " " + CStr(bytearray(elements - 1)) + " " + CStr(bytearray(elements)))
        Dim gch As GCHandle = GCHandle.Alloc(bytearray, GCHandleType.Pinned)
        Dim abytearray As IntPtr = gch.AddrOfPinnedObject()
        Dim absize As IntPtr = CType(elements, IntPtr) ' deliberately one less than size of bytearray
        ZeroMemory(abytearray, absize)
        gch.Free()
        ' show that bytearray has been filled with 0s except for the last element
        Debug.Print(CStr(bytearray(0)) + " " + CStr(bytearray(elements - 1)) + " " + CStr(bytearray(elements)))
    End Sub
End Class

Documentation: ZeroMemory@msdn on MSDN