Questions from Beginners MQL5 MT5 MetaTrader 5 - page 1523

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MrBrooklin #:

Do you need to use the handle? There is a function that removes an indicator with the specified name from the specified chart window .

IndicatorDelete(int,const string) - Price Charts - Standard Library - MQL5 Reference - Reference Manual for MetaTrader 5 Algorithmic/Automated Trading Language for MetaTrader 5

Regards, Vladimir.

it works only in the indicator code or I don't know how to do it, please give me an example of adding and removing an alligator.

 
Take a look at this example and make the necessary changes to the code:
//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
//--- удалим подокно  
   ChartIndicatorDelete(0,subwindow_ID,"Subwindow");
//--- удалим с главного окна индикатор PriceChannel: его короткое имя с параметрами по умолчанию - "Price Channel(22)"
   ChartIndicatorDelete(0,0,"Price Channel(22)");
  }
//+------------------------------------------------------------------+

I think everything is very clearly commented out in the code. The first line of the code deletes the subwindow, and the second line deletes the indicator from the main window, you just need to correctly write the short name of the indicator to be deleted.

Regards, Vladimir.

 
This is if the indicator has a name, but if it is added by handle, it is not so simple.
 
AkaEdie #:
This is if the indicator has a name, but if it is added by handle, it is not so simple

I don't understand, but what prevents you from writing (inserting) this short name in the code of the indicator you are using? For example, as it is done in the indicator code of Artyom Trishkin, only replacing the name "Net Volume" with some of your own:

IndicatorSetString(INDICATOR_SHORTNAME,"Net Volume");

Regards, Vladimir.

 
MrBrooklin #:

I don't understand, but what prevents you from writing (inserting) this short name in the code of the indicator you are using? For example, as it is done in the indicator code of Artyom Trishkin, but replacing the name "Net Volume" with some of your own:

Regards, Vladimir.

It is written in the indicator, not at the moment of its placement on the chart.

 
That's what I mean, I use alligator indicator, how can I connect it to the chart if I write this line of code in the indictor code? Through inlude? Will there be no conflict?
 
AkaEdie alligator indicator, how can I connect it to the chart if I write this line of code in the indictor code? Through inlude? Won't there be a conflict?

I'm interested in this question only now, when I looked through the documentation more carefully....

It turns out that there is no other way but with a double loop.

I got this...

Code

long chartID = ChartID();
//---
/*******************Script program start function********************/
void OnStart()
 {
  int totalWnd = (int)ChartGetInteger(chartID, CHART_WINDOWS_TOTAL);
  for(int w = 0; w < totalWnd; w++)
   {
    int totalInd = ChartIndicatorsTotal(chartID, w);
    for(int i = 0; i < totalInd; i++)
     {
      string indName = ChartIndicatorName(chartID, w, i);
      int handle = ChartIndicatorGet(chartID, w, indName);
      Print("INDICATOR_SHORTNAME ", indName, " handle ", handle);
     }
   }
 }/******************************************************************/

/********************************************************************\

Result

2024.04.20 09:59:54.730 Test (EURUSD,H1)        INDICATOR_SHORTNAME MA(10) handle 10
2024.04.20 09:59:54.730 Test (EURUSD,H1)        INDICATOR_SHORTNAME SAR(0.02,0.20) handle 11
2024.04.20 09:59:54.730 Test (EURUSD,H1)        INDICATOR_SHORTNAME MACD(12,26,9) handle 12
2024.04.20 09:59:54.731 Test (EURUSD,H1)        INDICATOR_SHORTNAME Stoch(5,3,3) handle 13

So it turns out that if you need to loop through all the available indicators to reach the desired one by checking the handles and when you find it, just interrupt the loop and delete the indicator by this short name.


Another option, easier... If you know that the indicator is in the main window, then the cycle of searching indicator windows can be removed.


Here I have added an indicator programmatically

long chartID = ChartID();
//---
/*******************Script program start function********************/
void OnStart()
 {
  int hAll = iAlligator(_Symbol, PERIOD_CURRENT, 13, 8, 8, 5, 5, 3, MODE_SMA, PRICE_MEDIAN);
  ChartIndicatorAdd(chartID, 0, hAll);
  Print("hAll ", hAll);
  int totalWnd = (int)ChartGetInteger(chartID, CHART_WINDOWS_TOTAL);
  for(int w = 0; w < totalWnd; w++)
   {
    int totalInd = ChartIndicatorsTotal(chartID, w);
    for(int i = 0; i < totalInd; i++)
     {
      string indName = ChartIndicatorName(chartID, w, i);
      int handle = ChartIndicatorGet(chartID, w, indName);
      Print("INDICATOR_SHORTNAME ", indName, " handle ", handle);
     }
   }
 }/******************************************************************/

The result is as follows

2024.04.20 10:20:59.131 Test (EURUSD,H1)        hAll 10
2024.04.20 10:20:59.131 Test (EURUSD,H1)        INDICATOR_SHORTNAME MA(10) handle 11
2024.04.20 10:20:59.131 Test (EURUSD,H1)        INDICATOR_SHORTNAME SAR(0.02,0.20) handle 12
2024.04.20 10:20:59.131 Test (EURUSD,H1)        INDICATOR_SHORTNAME Alligator(13,8,5) handle 10
2024.04.20 10:20:59.131 Test (EURUSD,H1)        INDICATOR_SHORTNAME MACD(12,26,9) handle 13
2024.04.20 10:20:59.131 Test (EURUSD,H1)        INDICATOR_SHORTNAME Stoch(5,3,3) handle 14
 

I figured it out, I need to add this code to the place where I need to remove all indicators

    long chartID = ChartID(); // Получаем идентификатор текущего графика
    int totalWnd = (int)ChartGetInteger(chartID, CHART_WINDOWS_TOTAL); // Получаем общее количество подокон на графике

    // Перебираем каждое подокно
    for (int w = 0; w < totalWnd; w++) {
        int totalInd = ChartIndicatorsTotal(chartID, w); // Получаем количество индикаторов в текущем подокне

        // Перебираем каждый индикатор в текущем подокне
        for (int i = totalInd - 1; i >= 0; i--) {
            string indName = ChartIndicatorName(chartID, w, i); // Получаем имя индикатора по индексу

            // Удаляем индикатор по имени
            if (!ChartIndicatorDelete(chartID, w, indName)) {
                Print("Ошибка удаления индикатора ", indName, " с графика: ", GetLastError());
            } else {
                Print("Удален индикатор: ", indName);
            }
        }
    }

Thank you very much, it is possible to remove all indicators before adding the EA to the chart from OnInit, as well as during deinitialisation in OnDeinit of the EA, it would be good to add an article on this subject. I envy your experience.

 
Alexey Viktorov #:

This is prescribed in the indicator, not at the moment of its placement on the chart.

Hi Alexey, I don't know, but I think I have described everything clearly and understandably in my message:

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Questions from MQL5 MT5 MetaTrader 5 beginners

MrBrooklin, 2024.04.20 05:04 AM

I don't understand, what prevents you from writing (inserting) this short name in the code of the indicator you are using? For example, as it is done in the indicator code of Artyom Trishkin, only replacing the name "Net Volume" with some of your own:

IndicatorSetString(INDICATOR_SHORTNAME,"Net Volume");

Regards, Vladimir.

Regards, Vladimir.
 

I asked for the deletion code, not the function of renaming the indicator.

taking into account that there can be many indicators, the code of comrade Alexey Viktorov was more useful.

Vladimir.

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