Invalid Pointer error in derived(child) class | Please help to debug

[Anil Varma]

Dear All

I am trying to create Multi Symbol EA using OOP. I have created a set of files and EATemplate to test it.

I am getting invalid pointer error in the mfCStrategyA (child of mfCStrategyBase). To my understanding child class should be able to access variables/methods of parent class, which I am not able to. Please help me debug where is the error in my code.

All required files are attached as Zip.

#include "mfCStrategyBase.mqh"
//+-----------------------------------------------------------------------------------------------------------------------------+
//| CLASS:                      mfCStrategyA
//+-----------------------------------------------------------------------------------------------------------------------------+
class mfCStrategyA : public mfCStrategyBase {

public:
                mfCStrategyA(SParamSymbol &pParamSymbol);
         ~mfCStrategyA();

void                                                                    OnTick();
private:
                int                                                                     mMagicBO;

private:
                void                                                                    RefreshBufferM15();

}; // END of Class declaration
//+-----------------------------------------------------------------------------------------------------------------------------+
//| METHOD:       mfCStrategyA()
//| APPLICATION:  PARAMETRIC CONSTRUCTOR METHOD
//+-----------------------------------------------------------------------------------------------------------------------------+
mfCStrategyA::mfCStrategyA(SParamSymbol &pParamSymbol)
                : mfCStrategyBase(pParamSymbol) {

                mMagicBO = 111;

} // End of CONSTRUCTOR Method mfCStrategyA()
//+-----------------------------------------------------------------------------------------------------------------------------+
//| METHOD:       ~mfCStrategyA()
//| APPLICATION:  DECONSTRUCTOR METHOD
//+-----------------------------------------------------------------------------------------------------------------------------+
mfCStrategyA::~mfCStrategyA() {


} // End of DECONSTRUCTOR Method ~mfCStrategyA()
//+-----------------------------------------------------------------------------------------------------------------------------+
//| METHOD:       OnTick()
//| APPLICATION:  TRADE OPERATIONS OF THE STRATEGY
//+-----------------------------------------------------------------------------------------------------------------------------+
void mfCStrategyA::OnTick(void) {

                if(cNewBar.M15()) {
                        RefreshBufferM15();
                }

} // End of method OnTick()
//+-----------------------------------------------------------------------------------------------------------------------------+
//| METHOD:     RefreshBufferM15()
//+-----------------------------------------------------------------------------------------------------------------------------+
void mfCStrategyA::RefreshBufferM15(void) {

        string vMethod = "[" + mSymbol + "] " + __FUNCTION__;
                PrintFormat("%s: ATR D01[%g] H01[%g] M15[%g] M05[%g] M01[%g]",vMethod,cATRD01.getATR(1),cATRH01.getATR(1),cATRM15.getATR(1),cATRM05.getATR(1),cATRM01.getATR(1));

} // END Of RefreshBufferM15()
//+-----------------------------------------------------------------------------------------------------------------------------+

2024.07.12 17:56:02.533 mfEATemplate (XAUUSD,M15)       MultiSymbol EA will process [2] Symbols, namely:
2024.07.12 17:56:02.534 mfEATemplate (XAUUSD,M15)       "XAUUSD" "ETHUSD"
2024.07.12 17:56:02.746 mfEATemplate (XAUUSD,M15)       [XAUUSD,2024.07.12 15:26] mfCStrategyBase::OnTick: ATR  D01[31.49] H01[4.67] M15[2.25] M05[1.45] M01[1.05]
2024.07.12 17:56:02.746 mfEATemplate (XAUUSD,M15)       invalid pointer access in 'mfCStrategyA.mqh' (54,145)

I will be grateful if can be assisted on the following too:

1) Can I set indicator parameters of mfCStrategyBase() from the EATemplate, i.e. by passing the CExpertBase() and avoid the duplication of setting the parameters?

Thanks in advance and wish all Happy Weekend.

regards.