GetNextPosition() get result (,0)

[GitGreenHand]

v1.11.0
code :

syncer := replication.NewBinlogSyncer(cfg)
nextPosition := syncer.GetNextPosition()
fmt.Println("Current binlog:", nextPosition)

result :

Current binlog: (, 0)

I want to get mysql current position ,so I find this GetNextPosition() method ，but it return (,0).
I don't know this method means?
it does not to connect mysql for getting lately position?
if I wan to get current position of mysql , how to get it ?

[dveeden]

You would need to call syncer.StartSync(pos) or syncer.StartSyncGTID(gtid) and then while processing the binlogs this should show the next position.