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即时报价数据类的集合在 \MQL5\Include\DoEasy\Collections\ 中，创建一个名为 TickSeriesCollection.mqh 的新即时报价数据集合类文件。该类是函数库所有对象的基准对象类的衍生类。我们看一下类主体，并分析其变量和方法：//+------------------------------------------------------------------+//| TickSeriesCollection.mqh |//| Copyright 2021, MetaQuotes Software Corp. |//| https://mql5.com/en/users/artmedia70 |//+------------------------------------------------------------------+#property copyright "Copyright 2021, MetaQuotes Software Corp."#property link "https://mql5.com/en/users/artmedia70"#property version "1.00"//+------------------------------------------------------------------+//| Include files |//+------------------------------------------------------------------+#include "ListObj.mqh"#include "..\Objects\Ticks\TickSeries.mqh"#include "..\Objects\Symbols\Symbol.mqh"//+------------------------------------------------------------------+//| Collection of symbol tick series |//+------------------------------------------------------------------+class CTickSeriesCollection : public CBaseObj {private: CListObj m_list; // List of used symbol tick series//--- Return the tick series index by symbol name int IndexTickSeries(const string symbol);public://--- Return (1) itself and (2) tick series collection list and (3) the number of tick series in the list CTickSeriesCollection *GetObject(void) { return &this; } CArrayObj *GetList(void) { return &this.m_list; } int DataTotal(void) const { return this.m_list.Total(); }//--- Return the pointer to the tick series object (1) by symbol and (2) by index in the list CTickSeries *GetTickseries(const string symbol); CTickSeries *GetTickseries(const int index);//--- Create a collection list of symbol tick series bool CreateCollection(const CArrayObj *list_symbols,const uint required=0);//--- Set the flag of using the tick series of (1) a specified symbol and (2) all symbols void SetAvailableTickSeries(const string symbol,const bool flag=true); void SetAvailableTickSeries(const bool flag=true);//--- Return the flag of using the tick series of (1) a specified symbol and (2) all symbols bool IsAvailableTickSeries(const string symbol); bool IsAvailableTickSeries(void);//--- Set the number of days of the tick history of (1) a specified symbol and (2) all symbols bool SetRequiredUsedDays(const string symbol,const uint required=0); bool SetRequiredUsedDays(const uint required=0);//--- Return the last tick object of a specified symbol (1) by index, (2) by time and (4) by time in milliseconds CDataTick *GetTick(const string symbol,const int index); CDataTick *GetTick(const string symbol,const datetime tick_time); CDataTick *GetTick(const string symbol,const long tick_time_msc);//--- Return the new tick flag of a specified symbol bool IsNewTick(const string symbol);//--- Create a tick series of (1) a specified symbol and (2) all symbols bool CreateTickSeries(const string symbol,const uint required=0); bool CreateTickSeriesAll(const uint required=0);//--- Update (1) a tick series of a specified symbol and (2) all symbols void Refresh(const string symbol); void Refresh(void);//--- Display (1) the complete and (2) short collection description in the journal void Print(void); void PrintShort(void); //--- Constructor CTickSeriesCollection(); };//+------------------------------------------------------------------+类的成员变量 m_list 属于 CListObj 类型 — 它是标准库 CArrayObj 类的衍生类，就像在函数库中创建的许多其他列表一样。 CListObj 类的唯一目的是实现标准库对象基类 CObject 类的 Type() 虚拟方法操作。 该方法应返回类的类型 ID。 在这种情况下，它是数组类型 ID。 | 
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发表于 2023-10-13 08:26:04