Im on windows 7 64
Nothing worked at all untill I rebuilt hidapi.dll to 64 bit platform. Now it`s as I described…
if(bytesWritten == -1) hasError = true;
seems I steel have problems with hidapi… but with nxt it works good.
Now im using both nxt and ev3 in one programm with same result. both connect, nxt gets commands, ev3 fails to.