script closing orders one at a time

[babymt4]

Hi:

I wrote a script to close all orders at the same time.  But I don't know why it closes orders one at a time.  I need to run the script repeatedly in order to close all open orders.  Does anyone know what I might have done wrong?

The script I wrote is as follows:

#property copyright "Copyright 2016, MetaQuotes Software Corp."
#property link      "http://www.mql4.com"
#property version   "1.00"
#property strict

bool selectresult=false,closeresult=false,deleteresult=false;

//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//---
   for(int z=OrdersTotal()-1;z>=0;z--)
      {
      selectresult=OrderSelect(z,SELECT_BY_POS,MODE_TRADES);
      if (OrderType()==OP_BUY) closeresult=OrderClose(OrderTicket(),OrderLots(),MarketInfo(OrderSymbol(), MODE_BID),10,clrNONE);
      if (OrderType()==OP_SELL) closeresult=OrderClose(OrderTicket(),OrderLots(),MarketInfo(OrderSymbol(), MODE_ASK),10,clrNONE);
      if (OrderType()==OP_BUYLIMIT ||
          OrderType()==OP_BUYSTOP ||
          OrderType()==OP_SELLLIMIT ||
          OrderType()==OP_SELLSTOP) deleteresult=OrderDelete(OrderTicket());

      }

  }

[William Roeder]

1. Play video	Please edit your post. For large amounts of code, attach it.

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2. In the presence of multiple orders (one EA multiple charts, multiple EA's, manual trading) you must count down when closing/deleting/modifying in a position loop and check OrderSelect when dealing with multiple orders. Get in the habit of always counting down. Loops and Closing or Deleting Orders - MQL4 forum What are Function return values ? How do I use them ? - MQL4 forum and Common Errors in MQL4 Programs and How to Avoid Them - MQL4 Articles
3. You must RefreshRates after sleep and between multiple server calls if you want to use the Predefined Variables (Bid/Ask) or OrderClosePrice() instead.

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4. Check your return codes and find out why. What are Function return values ? How do I use them ? - MQL4 forum and Common Errors in MQL4 Programs and How to Avoid Them - MQL4 Articles

[babymt4]

Thanks WHRoader !!