Any questions from newcomers on MQL4 and MQL5, help and discussion on algorithms and codes - page 996

[killer67]

Alexey Viktorov:

What you are trying to print is not correct. The correct way is this.

Here's the breakdown:

42 is a numerical identifier: ACCOUNT_MARGIN_FREE

i.e. we can get the free margin from the constant

AccountInfoDouble(ACCOUNT_MARGIN_FREE)

Or by its numeric identifier:

AccountInfoDouble(42)

Thank you!

[Alexey Viktorov]

killer67:

Here's the breakdown:

42 is a numerical identifier: ACCOUNT_MARGIN_FREE

i.e. we can get the free margin from the constant

Or by its numeric identifier:

Thank you!

The first version of writing is more informative.

[Happy]

https://www.mql5.com/ru/docs/constants/environment_state/marketinfoconstants

This is probably a silly question, but can these functions be used in MQL4? It's just that MQL4 tools are more limited.

How to get the data in MQL4:

SYMBOL_SESSION_DEALS

Number of trades in the current session

SYMBOL_SESSION_BUY_ORDERS	Total number of buy orders at the moment	long
SYMBOL_SESSION_SELL_ORDERS	Total number of sell orders at the moment	long
SYMBOL_VOLUME	Volume - Volume of the last trade	long
SYMBOL_VOLUMEHIGH	Maximum Volume for the day	long
SYMBOL_VOLUMELOW	Minimum Volume for the day

SYMBOL_BID	Bid - best bid	double
SYMBOL_BIDHIGH	Maximum Bid for the day	double
SYMBOL_BIDLOW	Minimum Bid for the day	double
SYMBOL_ASK	Ask - best bid	double
SYMBOL_ASKHIGH	Maximum Ask for the day	double
SYMBOL_ASKLOW	Minimum Ask for the day

SYMBOL_SESSION_VOLUME	Total volume of trades in the current session	double
SYMBOL_SESSION_TURNOVER	Total turnover in the current session	double
SYMBOL_SESSION_INTEREST	Total volume of open positions	double
SYMBOL_SESSION_BUY_ORDERS_VOLUME	Total volume of buy orders at the moment	double
SYMBOL_SESSION_SELL_ORDERS_VOLUME	Total volume of sell orders at the moment	double
SYMBOL_SESSION_OPEN	Session open price	double
SYMBOL_SESSION_CLOSE	Close price	double

It's a treasure trove of useful data in one go. The only question is how to do it in MQL4. Since MQL5 has a wider functionality, someone may ask, why I'm not studying MQL5. It's simple. Not all brokers support it. At the moment MQL4 is still the most popular and in demand.

[Alexey Viktorov]

Gilmor:

https://www.mql5.com/ru/docs/constants/environment_state/marketinfoconstants

This is probably a silly question, but can these functions be used in MQL4? It's just that MQL4 tools are more limited.

How to get data in MQL4:

It's a treasure trove of useful data in one click. But how to do it in MQL4. This article will also contain some tips on how to prepare MQL5 for studying in MQL5. It's simple. Not all brokers support it. At the moment MQL4 is still the most popular and in demand.

In the documentation of mql4 all that do not work are marked.

SYMBOL_BID	Bid - best bid	double
SYMBOL_BIDHIGH	Not supported	double
SYMBOL_BIDLOW	Not supported	double
SYMBOL_ASK	Ask - best offer to buy	double
SYMBOL_ASKHIGH	Not supported	double
SYMBOL_ASKLOW	Not supported	double
SYMBOL_LAST	Not supported	double
SYMBOL_LASTHIGH	Not supported	double
SYMBOL_LASTLOW	Not supported	double
SYMBOL_POINT	Single point value	double

This is not the whole table. There is more than one in the documentation, you just have to press F1 and read it.

[Happy]

Alexey Viktorov:

In the mql4 documentation all those that don't work are marked.

Thank you.

[killer67]

Help to understand, can't set stop loss correctly.
Log lines:
2019.11.16 12:38:40.660 2019.01.02:35:00 To calculate stops, take value from broker = 30
2019.11.16 13:20:18.791 2019.01.02:03:00 Open an order: Price = 1.14595, Stop Loss = 1.14565, Take Profit = 1.14625
2019.11.16 13:20:18.791 2019.01.02 02:03:00 failed instant buy 0.01 EURUSD at 1.14595 sl: 1.14565 tp: 1.14625 [invalid stops]
2019.11.16 13:20:18.792 2019.01.02:03:00 CTrade::OrderSend: instant buy 0.01 EURUSD at 1.14595 sl: 1.14565 tp: 1.14625 [invalid stops]


And now a little clarity for this case:
In the code before opening an order I calculate:
price = best market price to buy, depending on the order, in this case a buy.
SL = calculate a right stop (the broker allows a stop of at least 30 units from the price) i.e.
price (1.14595) - 0.0003 = SL (1.14565)
TP = calculate a right stop (the broker allows a stop of at least 30 units from the price) i.e.
price (1.14595) + 0.0003 = TP (1.14625)
Well everything looks correct, I hold 30 points, but I get a setting error.

If we set SL = 0, then everything is OK, order and TP are set.
I get an error in calculation of SL, where is the error?

[Iurii Tokman]

killer67:
Help me understand, I can't get the stop loss set correctly.
Log lines:
2019.11.16 12:38:40.660 2019.01.02 02:35:00 To calculate stops, take value from broker = 30
2019.11.16 13:20:18.791 2019.01.02 02:03:00 Open an order: Price = 1.14595, Stop Loss = 1.14565, Take Profit = 1.14625
2019.11.16 13:20:18.791 2019.01.02 02:03:00 failed instant buy 0.01 EURUSD at 1.14595 sl: 1.14565 tp: 1.14625 [Invalid stops]
2019.11.16 13:20:18.792 2019.01.02 02:03:00 CTrade::OrderSend: instant buy 0.01 EURUSD at 1.14595 sl: 1.14565 tp: 1.14625 [invalid stops]


And now some clarity for this case:
In the code I calculate before opening an order:
price = best market price to buy, depending on the order, in this case a buy.
SL = calculate a right stop (the broker allows stops at least 30 units away from the price), i.e.
price (1.14595) - 0.0003 = SL (1.14565)
TP = Calculate correct stop (broker allows stops at least 30 units away from price) i.e.
price (1.14595) + 0.0003 = TP (1.14625)
Well, everything seems to be right, I hold 30 pips, but I get a setting error.

We set SL = 0, then everything is OK, order and TP are set.
It turns out to be an error in calculation of SL, where is the error?

what type of price ?

[killer67]

Iurii Tokman:

what type of price ?

When buying Price = SYMBOL_ASK

On sale Price = SYMBOL_BID

[Iurii Tokman]

killer67:

When buying Price = SYMBOL_ASK

When selling Price = SYMBOL_BID

Have you tried adding a spread?

[killer67]

Iurii Tokman:

Have you tried adding a spread?

Fixed it this way:

double CheckSetSL(ENUM_ORDER_TYPE OrderT, double price)
  {
   if(InpSL != 0)
     {
      double CalcSL = 0.0;
      double SL = 0.0;
      if(InpSL < 0.0003)
        {
         CalcSL = 0.0003; // Если SL в настройках указано меньше 30 (установки брокером) то ставим минимально допустимую.
        }
      else
        {
         CalcSL = InpSL;
        }

      // Формируем стоп-лимит.
      if(OrderT == ORDER_TYPE_BUY)
        {

         SL = SymbolInfoDouble(_Symbol,SYMBOL_BID) - CalcSL;

        }
      else
        {

         SL = SymbolInfoDouble(_Symbol,SYMBOL_ASK) + CalcSL;

        }

      return SL;
     }

   return 0.0;
  }