MQL4 Reference 
Technical indicators iOBV
| double iOBV( |
string symbol, int timeframe, int applied_price, int shift) |
Calculates the On Balance Volume indicator and returns its value.
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. |
| applied_price |
- |
Applied price. It can be any of Applied price enumeration values. |
| shift |
- |
Index of the value taken from the indicator buffer (shift relative to the current bar the given amount of periods ago). |
Sample:
double val=iOBV(NULL, 0, PRICE_CLOSE, 1);
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