65 lines
2.5 KiB
MQL5
65 lines
2.5 KiB
MQL5
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//+------------------------------------------------------------------+
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//| UseWPR2.mq5 |
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//| Copyright 2021, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property indicator_separate_window
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#property indicator_buffers 0
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#property indicator_plots 0
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#include "..\..\Include\PRTF.mqh"
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// parameter to pass into subordinate indicator (0 is deliberately incorrect for IndWPR)
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input int WPRPeriod = 0;
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// global variable for subordinate indicator
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int handle;
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//+------------------------------------------------------------------+
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//| Custom indicator initialization function |
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//+------------------------------------------------------------------+
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int OnInit()
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{
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// use most simple way of creation with the name only, and the parameter
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handle = PRTF(iCustom(_Symbol, _Period, "IndWPR", WPRPeriod));
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// the next check should not be done here normally, because we need to wait
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// when the indicator is get executed and calculated (only for demo purpose)
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PRTF(BarsCalculated(handle));
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return handle == INVALID_HANDLE ? INIT_FAILED : INIT_SUCCEEDED;
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}
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//+------------------------------------------------------------------+
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//| Custom indicator iteration function |
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//+------------------------------------------------------------------+
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int OnCalculate(const int rates_total,
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const int prev_calculated,
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const int begin,
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const double &data[])
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{
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// wait until the subindicator is calculated for all bars
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if(PRTF(BarsCalculated(handle)) != PRTF(rates_total))
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{
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return prev_calculated;
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}
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// ... here will go normal processing relying on the handle
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return rates_total;
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}
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//+------------------------------------------------------------------+
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/*
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example output 1 (for WPRPeriod = 0):
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iCustom(_Symbol,_Period,IndWPR,WPRPeriod)=10 / ok
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BarsCalculated(handle)=-1 / INDICATOR_DATA_NOT_FOUND(4806)
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Alert: Incorrect Period value (0). Should be 1 or larger
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BarsCalculated(handle)=0 / ok
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rates_total=20000 / ok
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example output 2:
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iCustom(_Symbol,_Period,IndWPR,WPRPeriod)=10 / ok
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BarsCalculated(handle)=-1 / INDICATOR_DATA_NOT_FOUND(4806)
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BarsCalculated(handle)=20000 / ok
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rates_total=20000 / ok
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*/
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