70 lines
2.7 KiB
MQL5
70 lines
2.7 KiB
MQL5
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//+------------------------------------------------------------------+
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//| MarketBookAddRelease.mq5 |
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//| Copyright 2022, MetaQuotes Ltd. |
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//| https://www.mql5.com |
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//+------------------------------------------------------------------+
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#property copyright "2022, MetaQuotes Ltd."
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#property link "https://www.mql5.com"
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#property description "On start-up subscribe to market book notifications for specified symbol (empty string means current chart symbol)."
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#property description "On exit unsubscribe from market book notifications. Otherwise does nothing. See logs for success/errors."
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#property indicator_chart_window
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#property indicator_plots 0
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#include "..\..\Include\PRTF.mqh"
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input string WorkSymbol = ""; // WorkSymbol (empty means current chart symbol)
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const string _WorkSymbol = StringLen(WorkSymbol) == 0 ? _Symbol : WorkSymbol;
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string symbols[];
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//+------------------------------------------------------------------+
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//| Custom indicator initialization function |
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//+------------------------------------------------------------------+
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void OnInit()
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{
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const int n = StringSplit(_WorkSymbol, ',', symbols);
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for(int i = 0; i < n; ++i)
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{
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if(!PRTF(MarketBookAdd(symbols[i])))
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PrintFormat("MarketBookAdd(%s) failed", symbols[i]);
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}
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}
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//+------------------------------------------------------------------+
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//| Custom indicator iteration function (dummy) |
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//+------------------------------------------------------------------+
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int OnCalculate(const int rates_total, const int prev_calculated, const int, const double &price[])
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{
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return rates_total;
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}
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//+------------------------------------------------------------------+
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//| Finalization handler |
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//+------------------------------------------------------------------+
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void OnDeinit(const int)
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{
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for(int i = 0; i < ArraySize(symbols); ++i)
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{
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if(!PRTF(MarketBookRelease(symbols[i])))
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PrintFormat("MarketBookRelease(%s) failed", symbols[i]);
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}
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}
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//+------------------------------------------------------------------+
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/*
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example output 1 (market book is available):
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MarketBookAdd(symbols[i])=true / ok
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MarketBookRelease(symbols[i])=true / ok
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example output 2 (no market book for specific symbol):
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MarketBookAdd(symbols[i])=false / BOOKS_CANNOT_ADD(4901)
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MarketBookAdd(XPDUSD) failed
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MarketBookRelease(symbols[i])=false / BOOKS_CANNOT_DELETE(4902)
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MarketBookRelease(XPDUSD) failed
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*/
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//+------------------------------------------------------------------+
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