The function returns the handle of the Envelopes indicator.
[in] The symbol name of the security, the data of which should be used to calculate the indicator. The NULL value means the current symbol.
[in] The value of the period can be one of the ENUM_TIMEFRAMES values, 0 means the current timeframe.
[in] Averaging period for the main line.
[in] The shift of the indicator relative to the price chart.
[in] Smoothing type. Can be one of the values of ENUM_MA_METHOD.
[in] The price used. Can be any of the price constants ENUM_APPLIED_PRICE or a handle of another indicator.
[in] The deviation from the main line (in percents).
Returns the handle of a specified technical indicator, in case of failure returns INVALID_HANDLE. The computer memory can be freed from an indicator that is no more utilized, using the IndicatorRelease() function, to which the indicator handle is passed.
The buffer numbers: 0 - UPPER_LINE, 1 - LOWER_LINE.