Questions from Beginners MQL5 MT5 MetaTrader 5 - page 1304

[Alexey Viktorov]

Николай К:

Can you give me a hint? This entry:

var1=(var<10)?1:0;

What it means, how to interpret it, options for use. Parameters.

Read documentation.

[Dmitiry Ananiev]

Николай К:

Can you give me a hint? This entry:

var1=(var<10)?1:0;

What it means, how to interpret it, options for use. Parameters.

If var<10 = true, then var1 = 1
otherwise var1 = 0;

[Kira27]

Hi! ! Can you please tell me if the code written in MQL5 with OOP elements (CLASSES) will not work in the MQL4 Terminal? When I try to compile a program with classes included, I get errors in parameters passed when calling methods of the class. But the class itself compiles in the 4 editor without errors.

[Oleg Kolesov]

Hello, Can you help!

How can I transfer the value of horizontalindicator levelsto my EA?

***

[Vladimir Karputov]

Oleg Kolesov:

Hello, Can you help!

How to pass the ID of horizontal levelsof an indicator to an Expert Advisor?

The indicator handle in MQL5 MUST be created in OnInit - and it is created this way ONE time. This is the first thing you need to fix.

[Oleg Kolesov]

Vladimir. Created in OnInit(). The Expert Advisor sees the indicator. When visualization, it sends parameters correctly, it draws. It does not want to trade.

[Vladimir Karputov]

Oleg Kolesov:
Vladimir. Created in OnInit(). The Expert Advisor sees the indicator. When visualization, it sends parameters correctly, it draws. It does not want to trade.

Insert the code correctly.

[Oleg Kolesov]

//+------------------------------------------------------------------+
//|  Настраиваемые параметры                                         |
//+------------------------------------------------------------------+
input string Expert_Title="Exp_Tangents2";                        // The name of the EA
input int Period1=29;                                             // Period1
input int Period2=145;                                            // Period2
input int Period3=609;                                            // Period3
input double level1=46.0;                                         //                                    
input double level2=22.0;                                         //
input double level3=0.0;                                          //
input double level4=-22.0;                                        //
input double level5=-46.0;                                        //
//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
// получаем хэндл индикатора Tangents
   HLHandle=iCustom(NULL,0,"Examples\\Tangents2",Period1,Period2,
                      Period3,level1,level2,level3,level4,level5);
// если хэндл неверный
   if(HLHandle<0)
     {
      Alert("Ошибка создания хэнла индикатора Tangents2 - ошибка: ",GetLastError(),"!!");
      return(-1);
     }
   }
//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
//+---------------------------------------------------------------------+
//| Копируем значения индикаторов в массивы, используя хэндлы индикатора
//+---------------------------------------------------------------------+
   if(CopyBuffer(HLHandle,0,0,3,L1)<0 || CopyBuffer(HLHandle,1,0,3,L2)<0
      || CopyBuffer(HLHandle,2,0,3,L3)<0)
     {
      Alert("Ошибка копирования буферов хэндла индикатора Tangents2 - ошибка:",GetLastError(),"!!");
      return;
     }
  }
//+------------------------------------------------------------------+
//|  Проверяет условия на покупку                                    |
//+------------------------------------------------------------------+
bool checkBuy()
  {
   bool dobuy = false;
   if(L2[2]<level1 && L2[1]>level1 && L3[2]<level1 && L3[1]>level1 && (L1[1]>level1 || L1[1]<level5))
           {
            dobuy = true;
           }
   return(dobuy);
  }

[Vladimir Karputov]

Oleg Kolesov:

Why copy something twice from buffer '0'?

[Vladimir Karputov]

Oleg Kolesov:

Did you remember to flip the arrays you are copying into usingArraySetAsSeries(***,true) ?