MT4/MQL4 Getting Started to Mastering EA Tutorial Lesson 1 - MQL Language Common Functions (1) OrderSend() Function

int OrderSend(）
The function is used to open a new order,它有11个参数.`

int  OrderSend( 
   string   symbol,              // 交易品种
   int      cmd,                 // 买单、Sell ​​order type 
   double   volume,              // Order lot size
   double   price,               // 开仓价格
   int      slippage,            // 点差
   double   stoploss,            // 止损
   double   takeprofit,          // 止盈
   string   comment=NULL,        // Order Notes
   int      magic=0,             // Order magic code
   datetime expiration=0,        // 时限 
   color    arrow_color=clrNONE  // The open position shows the arrow color
   )
;

Use script instance：

//+------------------------------------------------------------------+ 
//| Script program start function | 
//+------------------------------------------------------------------+ 
void OnStart() 
  {
     
//--- place market order to buy 1 lot 
   int ticket=OrderSend(Symbol(),OP_BUY,1,Ask,0,0,0,"My order",16384,0,clrGreen); 
   if(ticket<0) 
     {
     
      Print("OrderSend failed with error #",GetLastError()); 
     } 
   else 
      Print("OrderSend placed successfully"); 
//--- 
  }

实例代码实现 Open a buy order at the current price（Buy）No take profit止损.

OrderSend(Symbol(),  // 当前交易品种
          OP_BUY,    // 开一个多单BUY ,Corresponding to the empty ordersell的代码是OP_SELL
          1,         // The open lot size is1
          Ask,      // The opening price is the current priceAsk
          0,        // 点差0
          0,         // 不设止损
          0,         // No take profit
          "My order",// Order Notes“My order”
          16384,     // 订单代码16384
          0,         // 不设时限,This parameter is generally set for pending orders
          clrGreen   // The open position chart shows a green arrow
);

Example function diagram：


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