Any questions from newcomers on MQL4 and MQL5, help and discussion on algorithms and codes - page 1465

[Mikhail Toptunov]

Dzmitry Zaitsau:
Hi, could you please tell me why ChartGetInteger is preceded by (int) in parentheses?

int bars=(int)ChartGetInteger(0,CHART_VISIBLE_BARS);

ChartGetInteger возвращает значение формата long или bool. Через (int) происходит перевод ChartGetInteger в значение int. 
если int bars, значит и значение должно быть int при присваивании.

1. Непосредственно возвращает значение свойства.
long  ChartGetInteger( 
   long  chart_id,          // идентификатор графика 
   int   prop_id,           // идентификатор свойства 
   int   sub_window=0       // номер подокна, если требуется 
   );
 
2. Возвращает true или false в зависимости от успешности выполнения функции.  В случае успеха значение свойства помещается в приемную переменную, передаваемую по ссылке последним параметром
bool  ChartGetInteger( 
   long    chart_id,        // идентификатор графика 
   int     prop_id,         // идентификатор свойства 
   int     sub_window,      // номер подокна 
   long&   long_var         // сюда примем значение свойства 
   );
 

[ifitstrue]

Hello. Please advise.

I have an indicator that is supposed to draw the High and Low lines of the day on each bar of a smaller timeframe.

When I put it on the chart, it just draws the lines at the current high and low of the day (in the picture, as it should be).

#property indicator_chart_window 
#property indicator_buffers 2       
#property indicator_color1 Blue     
#property indicator_color2 Red      

//datetime time=D'2021.03.30 00:00';

string strTime = "0:00";
 
double Buf_0[],Buf_1[];                   
double Sum_H=0;                    
double Sum_L=0;
//--------------------------------------------------------------------
int init()                         
  {
   SetIndexBuffer(0,Buf_0);        
   SetIndexStyle (0,DRAW_LINE,STYLE_SOLID,1);
   SetIndexBuffer(1,Buf_1);        
   SetIndexStyle (1,DRAW_LINE,STYLE_SOLID,1);
   return(0);                        
  }
//--------------------------------------------------------------------
int start()                        
  {
   int i, Counted_bars;                    
//--------------------------------------------------------------------
   Counted_bars=IndicatorCounted(); 
   datetime time=StringToTime(strTime);
   int bar_index=iBarShift(Symbol(),PERIOD_CURRENT,time,false); 
   i=Bars-Counted_bars;          
   if (i>bar_index) i=bar_index-1;  
   while(i>=0)                      
     {
      Sum_H=iHigh(Symbol(),PERIOD_D1,0);
      Sum_L=iLow(Symbol(),PERIOD_D1,0);
      Buf_0[i]=Sum_H;
      Buf_1[i]=Sum_L;
      i--;                          
     }
//--------------------------------------------------------------------
   return(0);                        
  }
//--------------------------------------------------------------------

[Tretyakov Rostyslav]

ifitstrue:

Hello. Please advise.

I have an indicator that is supposed to draw the High and Low lines of the day on each bar of a smaller timeframe.

When I put it on a chart, it just draws lines at the current high and low of the day (in the picture, as it should be).

Here is the answer

[ifitstrue]

MakarFX:

Here is the answer

Thank you.

[Dzmitry Zaitsau]

Hello, could you tell me please what is the chart ID?

bool TrendCreate(const long chart_ID=0, // chart ID

For example, when attaching the script to eur/usd, what is the chart ID? Where can I find it to find out.

[Artyom Trishkin]

Dzmitry Zaitsau:
Hello, could you please tell me what is the chart ID?

bool TrendCreate(const long chart_ID=0, // chart ID

For example, when attaching the script to eur/usd, what is the chart ID? Where do I dig, in order to understand it.

I usually go to the help.

[WindUP]

Can you please give me a code for MT4 and MT5 Expert Advisor to puta stop loss 2-3 points above the maximum/minimum of just closed candle.

Or where can i see the tutorial on this subject. Thanks in advance :-)

[Alexey Viktorov]

WindUP:

Please give me a code for MT4 and MT5 Expert Advisor to puta stop loss 2-3 points above the maximum/minimum of just closed candle.

Or where can i see the tutorial on this subject. Thanks in advance :-)

You declare an array of type MqlRates. You copy the OHLC and other parameters of a closed candlestick

int  CopyRates(
   string           symbol_name,       // имя символа
   ENUM_TIMEFRAMES  timeframe,         // период
   int              start_pos,         // откуда начнем (начнём с 1)
   int              count,             // сколько копируем (надо всего 1)
   MqlRates         rates_array[]      // массив, куда будут скопированы данные
   );

and then take the High or Low values from which you are offset by 2-3 points and put stops there.

You may also use

double  iHigh(
   string           symbol,          // символ
   int              timeframe,       // период
   int              shift            // сдвиг
   );

и

double  iLow(
   string           symbol,          // символ
   int              timeframe,       // период
   int              shift            // сдвиг
   );

[WindUP]

Alexey Viktorov:

Declare an array of MqlRates type. Copy OHLC and other parameters of closed candlestick

and then take values High or Low from which you are 2 or 3 points away and put stops there.

You may also use

и

Thank you, but could we have at least one objective example? A view from above, so to speak. I'm a complete novice and I've been on the subject for two days :-)

[SanAlex]

WindUP:
Thank you, but could you give me at least one objective example? A view from above, so to speak. I'm a complete novice and I've been on the subject for two days :-)

I'm trying to learn too - I think I'm getting somewhere

//+------------------------------------------------------------------+
//|                                                    CopyRates.mq5 |
//|                                  Copyright 2021, MetaQuotes Ltd. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2021, MetaQuotes Ltd."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property script_show_inputs
//---
sinput int    Inpcopiedrates = 2;    // какой бар
sinput double Inphigh        = 100;  // отступить от high
//---
datetime m_right_time = 0,m_left_Ctime = 0;
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart()
  {
//---
   MqlRates rates[];
   ArraySetAsSeries(rates,true);
   int copied=CopyRates(Symbol(),0,0,Inpcopiedrates,rates);
   if(copied>0)
     {
      Print("Скопировано баров: "+copied);
      string format="open = %G, high = %G, low = %G, close = %G, volume = %d";
      string out;
      int size=fmin(copied,10);
      for(int i=0; i<size; i++)
        {
         out=i+":"+TimeToString(rates[i].time);
         out=out+" "+StringFormat(format,
                                  rates[i].open,
                                  rates[i].high,
                                  rates[i].low,
                                  rates[i].close,
                                  rates[i].tick_volume);
         Print(out);
         ObjectDelete(0,"CopyRateshigh");
         m_left_Ctime=rates[i].time;
         m_right_time=TimeCurrent();
         TrendCreate(0,"CopyRateshigh",clrBlue,STYLE_DASHDOTDOT,1);
         TrendPointChange(0,"CopyRateshigh",0,m_left_Ctime,rates[i].high+Inphigh/100);
         TrendPointChange(0,"CopyRateshigh",1,m_right_time,rates[i].high+Inphigh/100);
        }
     }
   else
      Print("Не удалось получить исторические данные по символу ",Symbol());
  }
//+------------------------------------------------------------------+
//| Create a trend line by the given coordinates                     |
//+------------------------------------------------------------------+
bool TrendCreate(const long            chart_ID=0,        // chart's ID
                 const string          name="TrendLine",  // line name
                 const color           clr=clrRed,        // line color
                 const ENUM_LINE_STYLE style=STYLE_SOLID, // line style
                 const int             width=1,           // line width
                 const int             sub_window=0,      // subwindow index
                 datetime              time1=0,           // first point time
                 double                price1=0,          // first point price
                 datetime              time2=0,           // second point time
                 double                price2=0,          // second point price
                 const bool            back=false,        // in the background
                 const bool            selection=false,   // highlight to move
                 const bool            ray_left=false,    // line's continuation to the left
                 const bool            ray_right=true,    // line's continuation to the right
                 const bool            hidden=true,       // hidden in the object list
                 const long            z_order=0)         // priority for mouse click
  {
//--- set anchor points' coordinates if they are not set
   ChangeTrendEmptyPoints(time1,price1,time2,price2);
//--- reset the error value
   ResetLastError();
//--- create a trend line by the given coordinates
   if(!ObjectCreate(chart_ID,name,OBJ_TREND,sub_window,time1,price1,time2,price2))
     {
      Print(__FUNCTION__,
            ": failed to create a trend line! Error code = ",GetLastError());
      return(false);
     }
//--- set line color
   ObjectSetInteger(chart_ID,name,OBJPROP_COLOR,clr);
//--- set line display style
   ObjectSetInteger(chart_ID,name,OBJPROP_STYLE,style);
//--- set line width
   ObjectSetInteger(chart_ID,name,OBJPROP_WIDTH,width);
//--- display in the foreground (false) or background (true)
   ObjectSetInteger(chart_ID,name,OBJPROP_BACK,back);
//--- enable (true) or disable (false) the mode of moving the line by mouse
//--- when creating a graphical object using ObjectCreate function, the object cannot be
//--- highlighted and moved by default. Inside this method, selection parameter
//--- is true by default making it possible to highlight and move the object
   ObjectSetInteger(chart_ID,name,OBJPROP_SELECTABLE,selection);
   ObjectSetInteger(chart_ID,name,OBJPROP_SELECTED,selection);
//--- enable (true) or disable (false) the mode of continuation of the line's display to the left
   ObjectSetInteger(chart_ID,name,OBJPROP_RAY_LEFT,ray_left);
//--- enable (true) or disable (false) the mode of continuation of the line's display to the right
   ObjectSetInteger(chart_ID,name,OBJPROP_RAY_RIGHT,ray_right);
//--- hide (true) or display (false) graphical object name in the object list
   ObjectSetInteger(chart_ID,name,OBJPROP_HIDDEN,hidden);
//--- set the priority for receiving the event of a mouse click in the chart
   ObjectSetInteger(chart_ID,name,OBJPROP_ZORDER,z_order);
//--- set the text
   ObjectSetString(chart_ID,name,OBJPROP_TEXT,name);
//--- successful execution
   return(true);
  }
//+------------------------------------------------------------------+
//| Move trend line anchor point                                     |
//+------------------------------------------------------------------+
bool TrendPointChange(const long   chart_ID=0,       // chart's ID
                      const string name="TrendLine", // line name
                      const int    point_index=0,    // anchor point index
                      datetime     time=0,           // anchor point time coordinate
                      double       price=0)          // anchor point price coordinate
  {
//--- if point position is not set, move it to the current bar having Bid price
   if(!time)
      time=TimeCurrent();
   if(!price)
      price=SymbolInfoDouble(Symbol(),SYMBOL_BID);
//--- reset the error value
   ResetLastError();
//--- move trend line's anchor point
   if(!ObjectMove(chart_ID,name,point_index,time,price))
     {
      Print(__FUNCTION__,
            ": failed to move the anchor point! Error code = ",GetLastError());
      return(false);
     }
//--- successful execution
   return(true);
  }
//+------------------------------------------------------------------+
//| Check the values of trend line's anchor points and set default   |
//| values for empty ones                                            |
//+------------------------------------------------------------------+
void ChangeTrendEmptyPoints(datetime &time1,double &price1,
                            datetime &time2,double &price2)
  {
//--- if the first point's time is not set, it will be on the current bar
   if(!time1)
      time1=TimeCurrent();
//--- if the first point's price is not set, it will have Bid value
   if(!price1)
      price1=SymbolInfoDouble(Symbol(),SYMBOL_BID);
//--- if the second point's time is not set, it is located 9 bars left from the second one
   if(!time2)
     {
      //--- array for receiving the open time of the last 10 bars
      datetime temp[10];
      CopyTime(Symbol(),Period(),time1,10,temp);
      //--- set the second point 9 bars left from the first one
      time2=temp[0];
     }
//--- if the second point's price is not set, it is equal to the first point's one
   if(!price2)
      price2=price1;
  }
//+------------------------------------------------------------------+