MQL4 'CountOrders' 函数未定义错误解决方法

在编写 MQL4 自动交易系统 (EA) 时，您可能会遇到 'CountOrders' 函数未定义的错误。这是因为早期的 MQL4 版本并没有内置这个函数。

为了解决这个问题，您需要手动定义 'CountOrders' 函数。以下是一段包含了 'CountOrders' 函数定义的完整 MQL4 代码示例：

//+------------------------------------------------------------------+
//|                                                         7777.mq4 |
//|                                  Copyright 2023, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright 'Copyright 2023, MetaQuotes Ltd.'
#property link      'https://www.mql5.com'
#property version   '1.00'
#property strict

//+------------------------------------------------------------------+
//| Global variables                                                 |
//+------------------------------------------------------------------+
int MAGIC_NUMBER = 92133;
double INITIAL_LOTS = 0.5;
double REPLENISH_MULTIPLIER = 0.6;
int REPLENISH_ATTEMPTS = 5;
double PROFIT_TARGET = 40;
double MIN_FLUCTUATION = MarketInfo(Symbol(), MODE_POINT) * 100;

//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
{
    return (INIT_SUCCEEDED);
}

//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
    // Close all open orders
    CloseOrders();
}

//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
{
    double totalProfit = 0;

    // Check if there are any open orders with the specified magic number
    for (int i = OrdersTotal() - 1; i >= 0; i--)
    {
        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES) && OrderMagicNumber() == MAGIC_NUMBER)
        {
            totalProfit += OrderProfit();
        }
    }

    // Check if all positions have been closed
    if (totalProfit >= PROFIT_TARGET)
    {
        CloseOrders();
        return;
    }

    // Check if there are any open positions
    bool hasLongPosition = false;
    bool hasShortPosition = false;

    for (int i = OrdersTotal() - 1; i >= 0; i--)
    {
        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES) && OrderMagicNumber() == MAGIC_NUMBER)
        {
            if (OrderType() == OP_BUY)
            {
                hasLongPosition = true;
            }
            else if (OrderType() == OP_SELL)
            {
                hasShortPosition = true;
            }
        }
    }

    // Place pending orders if there are no open positions
    if (!hasLongPosition && !hasShortPosition)
    {
        // Determine the prices for the pending orders
        double askPrice = NormalizeDouble(MarketInfo(Symbol(), MODE_ASK), Digits);
        double bidPrice = NormalizeDouble(MarketInfo(Symbol(), MODE_BID), Digits);
        double buyPrice = askPrice + MIN_FLUCTUATION;
        double sellPrice = bidPrice - MIN_FLUCTUATION;

        // Open buy order
        if (!hasLongPosition)
        {
            if (CountOrders(OP_BUYSTOP) == 0)
            {
                // Delete sell order if exists
                if (CountOrders(OP_SELLSTOP) > 0)
                {
                    DeleteOrders(OP_SELLSTOP);
                }

                if (OpenBuyOrder(INITIAL_LOTS, buyPrice))
                {
                    Print('Opened buy order');
                }
                else
                {
                    Print('Failed to open buy order');
                }
            }
        }

        // Open sell order
        if (!hasShortPosition)
        {
            if (CountOrders(OP_SELLSTOP) == 0)
            {
                // Delete buy order if exists
                if (CountOrders(OP_BUYSTOP) > 0)
                {
                    DeleteOrders(OP_BUYSTOP);
                }

                if (OpenSellOrder(INITIAL_LOTS, sellPrice))
                {
                    Print('Opened sell order');
                }
                else
                {
                    Print('Failed to open sell order');
                }
            }
        }
    }
}

//+------------------------------------------------------------------+
//| Open buy order function                                          |
//+------------------------------------------------------------------+
boolean OpenBuyOrder(double lots, double price)
{
    int ticket = OrderSend(Symbol(), OP_BUYSTOP, lots, price, 0, 0, 0, 'Buy Order', MAGIC_NUMBER, 0, Green);
    if (ticket > 0)
    {
        if (OrderSelect(ticket, SELECT_BY_TICKET))
        {
            return true;
        }
        else
        {
            Print('Failed to select order with ticket ', ticket);
        }
    }
    else
    {
        Print('Failed to send buy order');
    }
    return false;
}

//+------------------------------------------------------------------+
//| Open sell order function                                         |
//+------------------------------------------------------------------+
boolean OpenSellOrder(double lots, double price)
{
    int ticket = OrderSend(Symbol(), OP_SELLSTOP, lots, price, 0, 0, 0, 'Sell Order', MAGIC_NUMBER, 0, Red);
    if (ticket > 0)
    {
        if (OrderSelect(ticket, SELECT_BY_TICKET))
        {
            return true;
        }
        else
        {
            Print('Failed to select order with ticket ', ticket);
        }
    }
    else
    {
        Print('Failed to send sell order');
    }
    return false;
}

//+------------------------------------------------------------------+
//| Close all orders function                                        |
//+------------------------------------------------------------------+
void CloseOrders()
{
    for (int i = OrdersTotal() - 1; i >= 0; i--)
    {
        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES) && OrderMagicNumber() == MAGIC_NUMBER)
        {
            if (!OrderClose(OrderTicket(), OrderLots(), OrderClosePrice(), 0))
            {
                Print('Failed to close order with ticket ', OrderTicket());
            }
        }
    }
}

//+------------------------------------------------------------------+
//| Delete orders of a specific type                                 |
//+------------------------------------------------------------------+
void DeleteOrders(int orderType)
{
    for (int i = OrdersTotal() - 1; i >= 0; i--)
    {
        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES) && OrderMagicNumber() == MAGIC_NUMBER && OrderType() == orderType)
        {
            if (!OrderDelete(OrderTicket()))
            {
                Print('Failed to delete order with ticket ', OrderTicket());
            }
        }
    }
}

//+------------------------------------------------------------------+
//| Count orders of a specific type                                  |
//+------------------------------------------------------------------+
int CountOrders(int orderType)
{
    int count = 0;
    for (int i = OrdersTotal() - 1; i >= 0; i--)
    {
        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES) && OrderMagicNumber() == MAGIC_NUMBER && OrderType() == orderType)
        {
            count++;
        }
    }
    return count;
}

代码说明：

CountOrders(int orderType) 函数用于计算指定类型的订单数量。
orderType 参数可以是以下值之一：
- OP_BUY: 买入订单
- OP_SELL: 卖出订单
- OP_BUYSTOP: 买入止损订单
- OP_SELLSTOP: 卖出止损订单
- OP_BUYLIMIT: 买入限价订单
- OP_SELLLIMIT: 卖出限价订单

使用方法：

要使用 CountOrders 函数，只需将其作为条件语句的一部分，例如：

// 如果没有买入止损订单，则打开一个新的买入止损订单
if (CountOrders(OP_BUYSTOP) == 0)
{
    // 打开买入止损订单的代码
}

请注意，这只是一个简单的示例，并且可能需要根据您的具体需求进行调整和完善。编写自动交易系统需要特定的经验和知识，确保您充分了解和测试代码，以确保其符合您的交易策略和需求。