ref ACL_SIZE_INFORMATION pAclInformation,

    struct ACL_SIZE_INFORMATION

                ACL_SIZE_INFORMATION AclSize = new ACL_SIZE_INFORMATION();

                GetAclInformation(pAcl, ref AclSize, (uint)Marshal.SizeOf(typeof(ACL_SIZE_INFORMATION)), ACL_INFORMATION_CLASS.AclSizeInformation);

static extern bool GetAclInformation(IntPtr pAcl, ref ACL_SIZE_INFORMATION pAclInformation, uint nAclInformationLength, ACL_INFORMATION_CLASS dwAclInformationClass);

ACL_SIZE_INFORMATION

struct ACL_SIZE_INFORMATION

Structure ACL_SIZE_INFORMATION