MQL4 Reference 
Timeseries access iBars
| int iBars( |
string symbol, int timeframe) |
Returns the number of bars on the specified chart.
For the current chart, the information about the amount of bars is in the predefined variable named Bars.
Parameters:
| symbol |
- |
Symbol the data of which should be used to calculate indicator. NULL means the current symbol. |
| timeframe |
- |
Timeframe. It can be any of Timeframe enumeration values. 0 means the current chart timeframe. |
Sample:
Print("Bar count on the 'EUROUSD' symbol with PERIOD_H1 is",iBars("EUROUSD",PERIOD_H1));
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