Use 'TCHAR *' for local DN variable rather than 'char *'.
/* Get the DN and write it to the client */
{
+#if defined(CURL_LDAP_WIN) && \
+ (defined(USE_WIN32_IDN) || defined(USE_WINDOWS_SSPI))
+ TCHAR *dn = ldap_get_dn(server, entryIterator);
+ size_t dn_len = _tcslen(dn);
+#else
char *dn = ldap_get_dn(server, entryIterator);
size_t dn_len = strlen(dn);
+#endif
result = Curl_client_write(conn, CLIENTWRITE_BODY, (char *)"DN: ", 4);
if(result) {