{{tag>mql5 mql4 caccountinfo}}

====== MQL5 標準ライブラリのラッパークラスを作ろう 2 (CAccountInfo 編) ======

[[:metatrader:mql:csymbolinfo_wrapper|]] の続き。\\
ラッパークラスを作るに至った経緯は上記ページを参照。\\
今回は [[https://www.mql5.com/ja/docs/standardlibrary/tradeclasses/caccountinfo|CAccountInfo]] のラッパークラス。\\

===== ラップしたメソッド =====

  * MarginMode
  * Balance
  * Credit
  * Profit
  * Equity
  * Margin
  * FreeMargin
  * MarginLevel
  * Currency
  * OrderProfitCheck
  * FreeMarginCheck

===== ラッパークラス ClAccountInfoHelper 完成！ =====

3 分クッキング方式（　＾ω＾）\\
MQL5 版のコードは ''CAccountInfo'' の対応メソッドを呼び出しているだけである。\\
MQL4 版のコードは ''AccountInfoDouble()'' で対応する値を取得している。ただし、''MarginMode()'', ''OrderProfitCheck()'', ''FreeMarginCheck()'' は他と異なった実装になっている。\\
特に ''MarginMode()'' の戻り値の ENUM_ACCOUNT_MARGIN_MODE は MQL4 に存在しないデータのため、便宜的に enum の宣言を追加し固定値 (ACCOUNT_MARGIN_MODE_RETAIL_HEDGING) を返却している。

=== コード ===

<accordion>
<panel title="クリックするとコードが開きます">
<code cpp AccountInfoHelper.mqh>
//+------------------------------------------------------------------+
//|                                            AccountInfoHelper.mqh |
//+------------------------------------------------------------------+
#ifndef _ACCOUNTINFOHELPER_MQH_
#define _ACCOUNTINFOHELPER_MQH_

//+------------------------------------------------------------------+
//| インクルード                                                     |
//+------------------------------------------------------------------+
#ifdef _MQL4
enum ENUM_ACCOUNT_MARGIN_MODE
{
    ACCOUNT_MARGIN_MODE_RETAIL_NETTING,
    ACCOUNT_MARGIN_MODE_EXCHANGE,
    ACCOUNT_MARGIN_MODE_RETAIL_HEDGING,
};
#include <Object.mqh>

#else  // _MQL4
#include <Trade\AccountInfo.mqh>

#endif // _MQL4

//+------------------------------------------------------------------+
//| ClAccountInfoHelperクラス                                        |
//+------------------------------------------------------------------+
class ClAccountInfoHelper : public CObject
{
public:
                     ClAccountInfoHelper(void);
    virtual         ~ClAccountInfoHelper(void);

    ENUM_ACCOUNT_MARGIN_MODE MarginMode(void) const;                // マージンモード
    double              Balance(void) const;                        // 口座残高
    double              Credit(void) const;                         // 与えられたクレジットの額
    double              Profit(void) const;                         // 口座の含み損益
    double              Equity(void) const;                         // 有効証拠金
    double              Margin(void) const;                         // 必要証拠金
    double              FreeMargin(void) const;                     // 余剰証拠金
    double              MarginLevel(void) const;                    // 証拠金維持率
    string              Currency(void) const;                       // 通貨名
    string              CurrencyJPN(void) const;                    // 通貨名

    double              OrderProfitCheck(const string symbol, const ENUM_ORDER_TYPE trade_operation,
                                         const double volume, const double price_open, const double price_close) const;
    double              FreeMarginCheck(const string symbol, const ENUM_ORDER_TYPE trade_operation,
                                        const double volume, const double price) const;

protected:
#ifdef _MQL4

#else  // _MQL4
    CAccountInfo        l_AccountInfo;                              // アカウント情報

#endif // _MQL4
};
//+------------------------------------------------------------------+
//| コンストラクター                                                 |
//+------------------------------------------------------------------+
ClAccountInfoHelper::ClAccountInfoHelper(void)
{
}
//+------------------------------------------------------------------+
//| デストラクター                                                   |
//+------------------------------------------------------------------+
ClAccountInfoHelper::~ClAccountInfoHelper(void)
{
}
//+------------------------------------------------------------------+
//| マージンモード                                                   |
//+------------------------------------------------------------------+
ENUM_ACCOUNT_MARGIN_MODE ClAccountInfoHelper::MarginMode(void) const
{
#ifdef _MQL4
    return(ACCOUNT_MARGIN_MODE_RETAIL_HEDGING);

#else
    return(l_AccountInfo.MarginMode());

#endif
}
//+------------------------------------------------------------------+
//| 口座残高                                                         |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::Balance(void) const
{
#ifdef _MQL4
    return(AccountInfoDouble(ACCOUNT_BALANCE));

#else
    return(l_AccountInfo.Balance());

#endif
}
//+------------------------------------------------------------------+
//| 与えられたクレジットの額                                         |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::Credit(void) const
{
#ifdef _MQL4
    return(AccountInfoDouble(ACCOUNT_CREDIT));

#else
    return(l_AccountInfo.Credit());

#endif
}
//+------------------------------------------------------------------+
//| 口座の含み損益                                                   |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::Profit(void) const
{
#ifdef _MQL4
    return(AccountInfoDouble(ACCOUNT_PROFIT));

#else
    return(l_AccountInfo.Profit());

#endif
}
//+------------------------------------------------------------------+
//| 有効証拠金                                                       |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::Equity(void) const
{
#ifdef _MQL4
    return(AccountInfoDouble(ACCOUNT_EQUITY));

#else
    return(l_AccountInfo.Equity());

#endif
}
//+------------------------------------------------------------------+
//| 必要証拠金                                                       |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::Margin(void) const
{
#ifdef _MQL4
    return(AccountInfoDouble(ACCOUNT_MARGIN));

#else
    return(l_AccountInfo.Margin());

#endif
}
//+------------------------------------------------------------------+
//| 余剰証拠金                                                       |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::FreeMargin(void) const
{
#ifdef _MQL4
    return(AccountInfoDouble(ACCOUNT_FREEMARGIN));

#else
    return(l_AccountInfo.FreeMargin());

#endif
}
//+------------------------------------------------------------------+
//| 証拠金維持率                                                     |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::MarginLevel(void) const
{
#ifdef _MQL4
    return(AccountInfoDouble(ACCOUNT_MARGIN_LEVEL));

#else
    return(l_AccountInfo.MarginLevel());

#endif
}
//+------------------------------------------------------------------+
//| 通貨名                                                           |
//+------------------------------------------------------------------+
string ClAccountInfoHelper::Currency(void) const
{
#ifdef _MQL4
    return(AccountInfoString(ACCOUNT_CURRENCY));

#else
    return(l_AccountInfo.Currency());

#endif
}
//+------------------------------------------------------------------+
//| 通貨名                                                           |
//+------------------------------------------------------------------+
string ClAccountInfoHelper::CurrencyJPN(void) const
{
#ifdef _MQL4
    string currency = Currency();
    if(currency == "JPY")
    {
        currency = "円";
    }
    else if(currency == "USD")
    {
        currency = "ドル";
    }
    else if(currency == "EUR")
    {
        currency = "ユーロ";
    }
    return(currency);

#else
    string currency = Currency();
    if(currency == "JPY")
    {
        currency = "円";
    }
    else if(currency == "USD")
    {
        currency = "ドル";
    }
    else if(currency == "EUR")
    {
        currency = "ユーロ";
    }
    return(currency);

#endif
}
//+------------------------------------------------------------------+
//| 想定利益(損失)額の計算                                           |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::OrderProfitCheck(const string symbol, const ENUM_ORDER_TYPE trade_operation,
        const double volume, const double price_open, const double price_close) const
{
#ifdef _MQL4
    double profit = EMPTY_VALUE;
    if(trade_operation == ORDER_TYPE_BUY || trade_operation == ORDER_TYPE_BUY_LIMIT || trade_operation == ORDER_TYPE_BUY_STOP)
    {
        profit = (price_close - price_open) * volume * MarketInfo(symbol, MODE_TICKVALUE) / MarketInfo(symbol, MODE_POINT);
    }
    else if(trade_operation == ORDER_TYPE_SELL || trade_operation == ORDER_TYPE_SELL_LIMIT || trade_operation == ORDER_TYPE_SELL_STOP)
    {
        profit = (price_open - price_close) * volume * MarketInfo(symbol, MODE_TICKVALUE) / MarketInfo(symbol, MODE_POINT);
    }
    return(profit);

#else
    return(l_AccountInfo.OrderProfitCheck(symbol, trade_operation, volume, price_open, price_close));

#endif
}

//+------------------------------------------------------------------+
//| ポジションを持ったと仮定した場合の余剰証拠金                     |
//+------------------------------------------------------------------+
double ClAccountInfoHelper::FreeMarginCheck(const string symbol, const ENUM_ORDER_TYPE trade_operation,
        const double volume, const double price) const
{
#ifdef _MQL4
    double freeMargin = 0.0;
    if(trade_operation == ORDER_TYPE_BUY || trade_operation == ORDER_TYPE_BUY_LIMIT || trade_operation == ORDER_TYPE_BUY_STOP)
    {
        ResetLastError();
        freeMargin = AccountFreeMarginCheck(symbol, OP_BUY, volume);
        if(GetLastError() == ERR_NOT_ENOUGH_MONEY)
        {
            freeMargin = 0.0;
        }
    }
    else if(trade_operation == ORDER_TYPE_SELL || trade_operation == ORDER_TYPE_SELL_LIMIT || trade_operation == ORDER_TYPE_SELL_STOP)
    {
        ResetLastError();
        freeMargin = AccountFreeMarginCheck(symbol, OP_SELL, volume);
        if(GetLastError() == ERR_NOT_ENOUGH_MONEY)
        {
            freeMargin = 0.0;
        }
    }
    return(freeMargin);

#else
    return(l_AccountInfo.FreeMarginCheck(symbol, trade_operation, volume, price));

#endif
}

#endif // _ACCOUNTINFOHELPER_MQH_
//+------------------------------------------------------------------+
</code>
</panel>
</accordion>

=== 使用例 ===

MQL4 のソースをビルドするときはソースに #define _MQL4 を定義することに留意する。

<code cpp>
//+------------------------------------------------------------------+
//|                                                       Sample.mq4 |
//+------------------------------------------------------------------+
#property strict
#property copyright     ""
#property version       "1.0"

// MQL4用ソースを使用
#define _MQL4

// インクルード
#include "AccountInfoHelper.mqh"

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
{
    ClAccountInfoHelper accountInfo;

    PrintFormat("口座残高 = %s %s", DoubleToString(accountInfo.Balance(), 0), accountInfo.Currency());
    PrintFormat("有効証拠金 = %s %s", DoubleToString(accountInfo.Equity(), 0), accountInfo.Currency());
    PrintFormat("証拠金維持率 = %s %%", DoubleToString(accountInfo.MarginLevel(), 2));

    return(INIT_SUCCEEDED);
}
// （以下、略）
</code>