67 lines
3 KiB
MQL5
67 lines
3 KiB
MQL5
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//+------------------------------------------------------------------+
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//| UseWPR1.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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//+------------------------------------------------------------------+
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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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// all handles are local variables since they are not used in this intro
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// absolute path: since indicator examples for this book is stored at
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// MQL5/Indicators/MQL5Book/p5, the complete pathname is as follows:
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int handle1 = PRTF(iCustom(_Symbol, _Period, "/Indicators/MQL5Book/p5/IndWPR"));
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// relative path: consists of the single name, searched in current folder
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// the caller indicator and the callee indicator are in the same folder
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int handle2 = PRTF(iCustom(_Symbol, _Period, "IndWPR"));
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// relative path: consists of the book subfolders and the name,
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// will find proper indicator in the context of MQL5/Indicators
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int handle3 = PRTF(iCustom(_Symbol, _Period, "MQL5Book/p5/IndWPR"));
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// wrong path: no such indicator in current folder (runtime error 4802)
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int handle4 = PRTF(iCustom(_Symbol, _Period, "IndWPR NonExistent"));
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// wrong path: backslashes are not escaped, every '\' should be '\\'
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// 4 compiler warnings in a row: unrecognized character escape sequence
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int handle5 = PRTF(iCustom(_Symbol, _Period, "\Indicators\MQL5Book\p5\IndWPR"));
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// this is a twin of handle2, check how their values are the same
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int handle6 = PRTF(iCustom(_Symbol, _Period, "IndWPR"));
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return INIT_SUCCEEDED;
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}
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//+------------------------------------------------------------------+
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/*
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output:
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iCustom(_Symbol,_Period,/Indicators/MQL5Book/p5/IndWPR)=10 / ok
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iCustom(_Symbol,_Period,IndWPR)=11 / ok
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iCustom(_Symbol,_Period,MQL5Book/p5/IndWPR)=12 / ok
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cannot load custom indicator 'IndWPR NonExistent' [4802]
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iCustom(_Symbol,_Period,IndWPR NonExistent)=-1 / INDICATOR_CANNOT_CREATE(4802)
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iCustom(_Symbol,_Period,\Indicators\MQL5Book\p5\IndWPR)=13 / ok
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iCustom(_Symbol,_Period,IndWPR)=11 / ok
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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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return rates_total;
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}
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//+------------------------------------------------------------------+
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