MQL4参考 图表操作 ChartPeriod
Returns the timeframe period of specified chart.
ENUM_TIMEFRAMES ChartPeriod( long chart_id=0 // Chart ID );
Parameters
chart_id=0
[in] Chart ID. 0 means the current chart.
Return Value
The function returns one of the ENUM_TIMEFRAMES values. If chart does not exist, it returns 0.