解决重复挂单问题：MQL4代码修复指南

之前的代码逻辑存在问题，可能导致重复挂单。以下是经过修正的代码，确保每个挂单只会触发一次：cpp//+------------------------------------------------------------------+//| 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(){ bool hasLongPosition = false; bool hasShortPosition = false;

// 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)        {            if (OrderType() == OP_BUY)            {                hasLongPosition = true;            }            else if (OrderType() == OP_SELL)            {                hasShortPosition = true;            }        }    }

// Check if all positions have been closed    if (!hasLongPosition && !hasShortPosition)    {        // Place pending orders if there are no open positions        double buyPrice = NormalizeDouble(MarketInfo(Symbol(), MODE_ASK), Digits) + MIN_FLUCTUATION;        double sellPrice = NormalizeDouble(MarketInfo(Symbol(), MODE_BID), Digits) - MIN_FLUCTUATION;

    // Open buy order        if (!hasLongPosition)        {            if (CountOrders(OP_BUYSTOP) == 0)            {                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)            {                if (OpenSellOrder(INITIAL_LOTS, sellPrice))                {                    Print('Opened sell order');                }                else                {                    Print('Failed to open sell order');                }            }        }    }

// Check if any positions have reached the profit target    double totalProfit = 0;    for (int i = OrdersTotal() - 1; i >= 0; i--)    {        if (OrderSelect(i, SELECT_BY_POS, MODE_TRADES) && OrderMagicNumber() == MAGIC_NUMBER)        {            totalProfit += OrderProfit();        }    }    if (totalProfit >= PROFIT_TARGET)    {        CloseOrders();    }}

//+------------------------------------------------------------------+//| Open buy order function |//+------------------------------------------------------------------+bool 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 |//+------------------------------------------------------------------+bool 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()); } } }}

//+------------------------------------------------------------------+//| 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;}

代码改进说明:

避免重复挂单: 代码逻辑经过优化，确保在任何时刻，同一方向上只有一个挂单。* 错误处理: 代码中添加了错误处理机制，例如在发送订单或选择订单失败时打印错误信息。* 代码注释: 代码中添加了详细的注释，以便于理解代码逻辑。

注意事项:

这段代码只是一个简单的示例，您可能需要根据您的具体需求进行调整和完善。* 在实盘交易之前，请务必在模拟账户上充分测试您的EA交易策略。

希望这篇文章能够帮助您解决MQL4代码中的重复挂单问题！