下面是一个示例盈利加仓EA的MQL4代码：

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//定义初始变量和参数
double Lots = 0.01;
double MaxLots = 0.1;
double Step = 100;
double ProfitTarget = 100.0; //目标盈利
double StopLoss = 30.0;
double TrailingStop = 15.0;

int max_orders = 10; //最大订单数
int order_count = 0; //当前订单数
bool in_trade = false; //是否在交易中

//定义交易函数
void OpenOrder(double lot_size, double sl, double tp)
{
    in_trade = true;
    OrderSend(Symbol(), OP_BUY, lot_size, Ask, 3, sl, tp, "Martin EA", 0, 0, Lime);
}

//定义调整交易量函数
void AdjustLots()
{
    if (in_trade) {
        int current_order = order_count - 1;
        double profit = OrderProfit() + OrderCommission();
        double target_profit = (current_order + 1) * ProfitTarget;
        if (profit > target_profit) {
            double new_lots = MathMin(Lots * pow(Step, current_order), MaxLots);
            OpenOrder(new_lots, StopLoss, TrailingStop); //再次开仓
        }
    }
}

//在OnInit()函数中初始化参数
void OnInit()
{
    SetStopLoss(StopLoss);
    SetTakeProfit(ProfitTarget);
    SetTrailingStop(TrailingStop);
}

//在OnTick()函数中处理交易逻辑
void OnTick()
{
    if (!in_trade) { //如果没有订单则下单
        OpenOrder(Lots, StopLoss, TrailingStop);
        order_count++;
    } else {
        AdjustLots(); //如果有订单则调整交易量
    }
}

//在OnDeinit()函数中关闭订单
void OnDeinit(const int reason)
{
    if (in_trade) {
        for (int i = 0; i < order_count; i++) {
            OrderClose(i, OrderLots(), Bid, 3, Red);
        }
    }
}