midireader reader;
reader.open("1234.mid");
double microsPerTick = reader.get_microseconds_per_tick();
int totalNumNotesRead = 0;
for (int t = 0; t < reader.getNumTracks(); t  ) {
    reader.setTrackNumber(t);
    int i = 0;
    long totalTicks = 0, microseconds = 0;
    smfmidimessage *message;
    while ((message = reader.read()) != nullptr) {
        totalTicks  = message->delta_ticks;
        microseconds  = microsPerTick * message->delta_ticks;
        switch(message->getMessageType()) {
            case smftype_channelvoicemessage : {
                smfchannelvoicemessage *channelvoicemessage = (smfchannelvoicemessage *)message;
                printf("]: [-,M]: m: delta: =\tstatus: 0x%2x\tdata1: =\tdata2: =\tdata3: -\t\n",
                    microseconds/1000,
                    t,
                    i,
                    totalTicks,
                    channelvoicemessage->delta_ticks,
                    channelvoicemessage->status,
                    channelvoicemessage->data1,
                    channelvoicemessage->data2,
                    channelvoicemessage->data3);
                break; 
            }

            case smftype_settempomessage : {
                printf("tempo change: %f\n", ((smfsettempomessage *)message)->getTempo());
                break;
            }

            default: 
                break;
        }

        delete message;
        i  ;
    }
    totalNumNotesRead  = i;
}