1、在电脑上打开“MetaEditor 4”（MQL4语言编辑器）；在上方工具栏选择“文件”，然后“新建”一个文件；
2、在接下来的“向导界面”中选择“EA模板”；然后给例程起个名字(我起的名字是“example”；接下来使用默认配置；一个例程的模板文件建立了；
3、在这个例程模板文件中有三个主要函数：OnInit()、OnDeinit()、OnTick()；OnInit()函数用于载入EA自动交易程序时进行初始化；OnDeinit()函数用于EA自动交易程序退出时归还占用资源；OnTick()是EA自动交易函数的主体，是运行你的EA自动交易程序的主体；一般情况下，我们不会去动OnInit()函数和OnDeinit()函数；
4、为了查询我们现有持仓订撮劝丛食单的情况，我们用到了“循环遍历”的结构；为了体现查询结果，需要设置一些变量和数组，用于记录查询数据；在例程的OnTic娱浣嫁装k()函数中输入以下语句： int check_order; string check_symbol[4]; int check_order_num[4]; int check_order_type[4]; double check_order_lots[4]; double check_order_profit[4];
5、然后设计我们的“循环遍历”订单的系统功能，这里用到了“for循环”结构和一些M兑恶铼融QL4自带的函数；在定义的变量和数组的后面输入下列语句：for(check_order租涫疼迟=0;check_order<OrdersTotal();check_order++) { if(OrderSelect(check_order,SELECT_BY_POS)==true) { check_symbol[check_order]=OrderSymbol(); check_order_num[check_order]=OrderTicket(); check_order_type[check_order]=OrderType(); check_order_lots[check_order]=OrderLots(); check_order_profit[check_order]=OrderProfit(); } else Comment("check failed!!!"); }
6、最后，我们使用comment（）函墙绅褡孛数，将检查结果显示在行情图表的左上角，因此，继续在OnTick(像粜杵泳)函数中输入下列语句：Comment(check_symbol[0]," ",check_order_num[0]," ",check_order_type[0]," ",check_order_lots[0]," ",check_order_profit[0],"\n",check_symbol[1]," ",check_order_num[1]," ",check_order_type[1]," ",check_order_lots[1]," ",check_order_profit[1],"\n",check_symbol[2]," ",check_order_num[2]," ",check_order_type[2]," ",check_order_lots[2]," ",check_order_profit[2],"\n",check_symbol[3]," ",check_order_num[3]," ",check_order_type[3]," ",check_order_lots[3]," ",check_order_profit[3],"\n");
7、完成输入后，点击上方工具栏中的“编译调试”键；怎么样，我们已经能全部查询到我们现在的持仓情况了。
