All,
I have the below code, previously in VB.NET 1.0/2002. It is (as far as I
understand) creating a mutex and then removing ACL/security information.
I get a warning in VB.NET 2.0/2005 stating I should use SafeWaitHandle
rather than Handle.
I have read a few blogs about the benefits of SafeWaitHandle vs Handle, but
am not sure exactly the nature of the change I should be making.
SetSecurityInfo seems to need an IntPtr, so it won't let me pass in a
SafeWaitHandle to it (understandably). I could call
SafeWaitHandle.DangerousGetHandle but it seems dangerous (pun intended).
Can anyone give me some pointers? Note I am keen to solve this specific
problem, but am also interested in the more general issue (since there
seems to be other handle usage in our app) of how to convert Handle usage
to SafeHandle usage.
Public Class NoSecurityMutex
Private mutex As mutex
Public Sub New(ByVal initiallyOwned As Boolean, ByVal name As String,
ByRef createdNew As Boolean)
Me.mutex = New mutex(initiallyOwned, name, createdNew)
DeleteDefaultDaclForKernelObject(Me.mutex.Handle)
End Sub
Public Shared Sub DeleteDefaultDaclForKernelObject(ByVal handle As
IntPtr)
AdvApi32.SetSecurityInfo(handle, _
AdvApi32.SE_OBJECT_TYPE.SE_KERNEL_OBJECT, _
AdvApi32.DACL_SECURITY_INFORMATION, 0, 0, 0, 0)
End Sub
<DllImport("Advapi32.dll", CharSet:=CharSet.Auto, EntryPoint:=
"SetSecurityInfo", SetLastError:=True)> _
Friend Shared Function SetSecurityInfo(ByVal handle As System.IntPtr, _
ByVal ObjectType As
SE_OBJECT_TYPE, _
ByVal SecurityInfo As
System.Int32, _
ByVal psidOwner As
System.Int32, _
ByVal psidGroup As
System.Int32, _
ByVal pDacl As System.Int32, _
ByVal pSacl As System.Int32) As
Int32
'No implementation
End Function
Thanks
Matthew Wills @ MLC
Senior Analyst Programmer
(w) 02 9957 8183
(email) [EMAIL PROTECTED]
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