Multi currency transaction program architecture design

//+------------------------------------------------------------------+

//| MultiSymbols.mq4 |

//| BillAbiao，QQ：327151901，WX：billabiao |

//| https://one.exness.link/a/sduus6ff |

//+------------------------------------------------------------------+

#property copyright "BillAbiao，QQ：327151901，WX：billabiao"

#property link "https://one.exness.link/a/sduus6ff"

#property version "1.00"

#property strict

string userSymbols2[]={"EURUSD","GBPUSD","GBPCHF"};

string systemSymbols[];

string debugMsg;

double minEquity,maxEquity;

bool stopFlagRun=false;

//----------

struct CONTROL_DATA{

int index;

string strSymbol;

ENUM_TIMEFRAMES timeFrame;//=PERIOD_H2;

int ExtHandle;

// CTrade ExtTrade;

int magicma;

int switchDo;

int orders_buy,orders_sell;

int orders_pending_buy,orders_pending_sell;

double minOpenPrice_buy,minOpenPrice_sell;

ulong maxOpenPrice_buy_ticket;

ulong minOpenPrice_buy_ticket;

double maxOpenPrice_buy,maxOpenPrice_sell;

double maxPendingOpenPrice_buy,maxPendingOpenPrice_sell;

ulong maxPendingOpenPrice_buy_ticket,maxPendingOpenPrice_sell_ticket;

double minPendingOpenPrice_buy,minPendingOpenPrice_sell;

ulong minPendingOpenPrice_buy_ticket,minPendingOpenPrice_sell_ticket;

double profit_buy,profit_sell;

double volume_buy,volume_sell;

ENUM_ORDER_TYPE signal;

double agvLen;

double minOpenPrice_profitBuy;

double maxOpenPrice_profitBuy;

double maxOpenPrice_volume;

double minOpenPrice_buyVolume;

double maxProfitBuy,minProfitBuy;

datetime lastOpenDateTime;

double maxPendingOpenPrice_volume;

double magicN;

double skip;

ulong stopLevel;//=SymbolInfoInteger(d[index].strSymbol,SYMBOL_SPREAD);

double point;

ulong spread;

double lastAsk;

double ask,bid;

int digits;

};

CONTROL_DATA d[];

#define MAGICMA 03082100

//+------------------------------------------------------------------+

//| Expert initialization function |

//+------------------------------------------------------------------+

int OnInit()

{

//---

initSymbols();

int n=ArraySize(systemSymbols);

ArrayResize(d,n);

for(int i=0;i<n;i++)

{

OnInit_INDEX(i);

}

//---

EventSetTimer(6);

minEquity=0;

maxEquity=0;

return(INIT_SUCCEEDED);

}

void OnInit_INDEX(int index)

{

int k=index;

d[k].index=index;

d[k].strSymbol=systemSymbols[index];

d[k].timeFrame=PERIOD_H1;

d[k].magicma=MAGICMA+index;

d[k].switchDo=1;

d[k].maxProfitBuy=0;

d[k].minProfitBuy=0;

d[k].magicN=5;

d[k].lastAsk=SymbolInfoDouble(d[k].strSymbol,SYMBOL_ASK);

}

void initSymbols()

{

int n=ArraySize(userSymbols2);

ArrayResize(systemSymbols,n);

int i;

for(i=0;i<n;i++)

{

// systemSymbols[i]=userSymbols2[i];

systemSymbols[i]=getSystemSymbol(userSymbols2[i]);

}

return ;

}

string getSystemSymbol(string strSymbol)

{

string ret="";

int n=SymbolsTotal(false);

int i;

string strTemp=strSymbol;

StringToLower(strTemp);

for(i=0;i<n;i++)

{

string name=SymbolName(i,false);

StringToLower( name);

if( strTemp==StringSubstr(name,0,6))

{

ret=SymbolName(i,false);

break;

}

}

return ret;

}

//+------------------------------------------------------------------+

//| Expert deinitialization function |

//+------------------------------------------------------------------+

void OnDeinit(const int reason)

{

//---

EventKillTimer();

}

//+------------------------------------------------------------------+

//| Expert tick function |

//+------------------------------------------------------------------+

void OnTick()

{

//---

MainRUN( "Tick " );

return ;

}

void OnTimer()

{

MainRUN( "Timer" );

return ;

}

bool runFlag=false;

void MainRUN( string strWho)

{

if( runFlag) return ;

runFlag=true;

debugMsg=strWho+": ";

mainRun();

runFlag=false;

Comment(debugMsg);

return ;

}

//+------------------------------------------------------------------+

void mainRun()

{

getMainData();

if( stopFlagRun) return ;

int i,n=ArraySize(d);

for( i=0;i<n;i++)

{

subControlSymbol(i);

}

return ;

}

void getMainData()

{

debugMsg+="mainData,";

debugMsg+=StringFormat("date=%s\n", TimeToString(TimeCurrent(),TIME_DATE|TIME_SECONDS));

double equity=AccountEquity();

if( minEquity==0 || equity<minEquity) minEquity=equity;

if( maxEquity==0 || equity>maxEquity) maxEquity=equity;

debugMsg+=StringFormat("minEquity=%.2f,maxEquity=%.2f,Equity=%.2f\n",minEquity,maxEquity,equity);

if( equity<10)

{

stopFlagRun=true;

}

return ;

}

void subControlSymbol(int index)

{

debugMsg+=StringFormat("%d--> %s\n",index+1, d[index].strSymbol);

control_getdata(index);

switch (d[index].switchDo)

{

case 1:

d[index].switchDo=2;

control_open(index);

break;

case 2:

d[index].switchDo=3;

control_close(index);

break;

case 3:

d[index].switchDo=1;

control_modify(index);

break;

}

//------

debugMsg+="\n";

return ;

}

void control_open(int index)

{

debugMsg+="open\n";

return ;

}

void control_close(int index)

{

debugMsg+="close\n";

return ;

}

void control_modify(int index)

{

debugMsg+="modify\n";

}

void control_getdata(int index)

{

return ;

}

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