我用以下代码怎么获取不了开仓的价格? double GetOpenPrice( long dealTicket) { // Get the order ticket associated with the deal long orderTicket = HistoryDealGetInteger (dealTicket, DEAL_ORDER ); double openPrice = HistoryOrderGetDouble (orderTicket, ORDER_PRICE_OPEN ); } 是哪里有问题吗?如果打印的话会显示获取不了开仓价格。