C# Signature:

[DllImport("advapi32.dll", CharSet=CharSet.Auto)]
static extern uint SetEntriesInAcl(
    uint cCountOfExplicitEntries,
    EXPLICIT_ACCESS[] pListOfExplictEntries,
    IntPtr OldAcl,
    out IntPtr NewAcl);

VB Signature:

Declare Function SetEntriesInAcl Lib "advapi32.dll" (( _
    ByVal cCountOfExplicitEntries As Integer, _
    ByRef pListOfExplicitEntries As EXPLICIT_ACCESS, _
    ByVal OldAcl As IntPtr, _
    ByRef NewAcl As IntPtr) As Integer

User-Defined Types:

EXPLICIT_ACCESS

Notes:

Returns ERROR_SUCCESS on success or an error code on failure. The new ACL must be freed with LocalFree.

Tips & Tricks:

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C# Sample Code:

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VB.Net Sample Code:

    Private Const SET_ACCESS = 2&
    ' Inheritance Flags
    Private Const CONTAINER_INHERIT_ACE = &H2
    Private Const OBJECT_INHERIT_ACE = &H1

    Dim pNewDACL, pOldDACL As IntPtr
    Dim ea As EXPLICIT_ACCESS
    Dim Win32Error As Win32Exception
    Dim ret, iPerm As Integer

    ' build an explicit access structure
    BuildExplicitAccessWithName(ea, strUserName, iPerm, SET_ACCESS, CONTAINER_INHERIT_ACE Or OBJECT_INHERIT_ACE)

    ' merge this Explict Access with the existing DACL
    ret = SetEntriesInAcl(1, ea, pOldDACL, pNewDACL)
    If ret <> 0 Then
        Win32Error = New Win32Exception(ret)
        Throw New Exception(Win32Error.Message)
    End If

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