adsldp: Implement IDirectorySearch::GetFirstRow().

dlls/adsldp/adsldp.c

@@ -398,7 +398,8 @@ typedef struct
 
 struct ldap_search_context
 {
-    LDAPMessage *res;
+    LDAPMessage *res, *entry;
+    ULONG count, pos;
 };
 
 static inline LDAP_namespace *impl_from_IADs(IADs *iface)
@@ -1197,8 +1198,20 @@ static HRESULT WINAPI search_AbandonSearch(IDirectorySearch *iface, ADS_SEARCH_H
 
 static HRESULT WINAPI search_GetFirstRow(IDirectorySearch *iface, ADS_SEARCH_HANDLE res)
 {
-    FIXME("%p,%p: stub\n", iface, res);
-    return E_NOTIMPL;
+    LDAP_namespace *ldap = impl_from_IDirectorySearch(iface);
+    struct ldap_search_context *ldap_ctx = res;
+
+    TRACE("%p,%p\n", iface, res);
+
+    if (!ldap->ld) return E_NOTIMPL;
+
+    if (!res) return E_ADS_BAD_PARAMETER;
+
+    ldap_ctx->count = ldap_count_entries(ldap->ld, ldap_ctx->res);
+    ldap_ctx->pos = 0;
+    ldap_ctx->entry = ldap_first_entry(ldap->ld, ldap_ctx->res);
+
+    return ldap_ctx->entry ? S_OK : S_ADS_NOMORE_ROWS;
 }
 
 static HRESULT WINAPI search_GetNextRow(IDirectorySearch *iface, ADS_SEARCH_HANDLE res)