I've been working on an LDAP library and I've managed to work out how to
read info from Active Directory.
I'm now trying to write information back (or delete) and I can't work out
the signatures/struct to use or whether I need to allocate unmanaged memory
and pass that instead.
The LDAP API stuff and my managed definitions are:-
WINLDAPAPI ULONG LDAPAPI ldap_modifyW( LDAP *ld, PWCHAR dn, LDAPModW *mods
[] );
[DllImport("wldap32.dll", CharSet=CharSet.Auto)]
public static extern int ldap_modify_s(HandleRef pLDAPSession, /* PCHAR */
[In] string dn, /* LDAPMod* */ [In, Out] LDAP.LDAPMod[] mods);
(I'm pretty sure that the first two parameters and the return value are
correct since I've used their values in other LDAP functions successfully)
and
typedef struct ldapmodW {
ULONG mod_op;
PWCHAR mod_type;
union {
PWCHAR *modv_strvals;
struct berval **modv_bvals;
} mod_vals;
} LDAPModW, *PLDAPModW;
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
public class LDAPMod {
public int ModOp;
[MarshalAs(UnmanagedType.LPStr)]
public string ModType;
public object[] Values;
}
(Values will be set to a String[] for the purposes of this test - I'll work
on the binary stuff later)
The code I am using to delete an existing attribute is:-
LDAP.LDAPMod[] modifications = new LDAP.LDAPMod[modificationList.Count + 1];
modificationList.CopyTo(modifications);
modifications[modificationList.Count] = null;
int result = LDAP.API.ldap_modify_s(_session._LDAPSession, DN,
modifications);
modifications[0] is {0x02, "description", null} (0x02 is LDAP_MOD_REPLACE
and the null should delete all existing values)
modifications[1] is null (required to serve as the list terminator
I get error 0x59 which is LDAP_PARAM_ERROR
I will be grateful for any help or pointers.
Cheers
Simon
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