forked from rosh/MQL5Book
57 lines
2.1 KiB
MQL5
57 lines
2.1 KiB
MQL5
//+------------------------------------------------------------------+
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//| IndReplica1.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_chart_window
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#property indicator_buffers 1
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#property indicator_plots 1
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#include "..\..\Include\PRTF.mqh"
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double buffer[];
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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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// register the array as indicator buffer
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PRTF(SetIndexBuffer(0, buffer)); // true / ok
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// this 2-nd incorrect call made deliberetly to show the error
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PRTF(SetIndexBuffer(1, buffer)); // false / BUFFERS_WRONG_INDEX(4602)
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// check the size, it's still 0
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PRTF(ArraySize(buffer)); // 0
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return 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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// check just after start-up how the buffer size is automatically managed by the platform
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if(prev_calculated == 0)
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{
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PRTF(ArraySize(buffer));
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}
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// on every new bar or many new bars (including first event)
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if(prev_calculated != rates_total)
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{
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// update new bars
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ArrayCopy(buffer, data, prev_calculated, prev_calculated);
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}
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else // ticks on current bar
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{
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// update the latest bar
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buffer[rates_total - 1] = data[rates_total - 1];
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}
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return rates_total; // report number of processed bars for future calls
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}
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//+------------------------------------------------------------------+
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