How can I solve the duplicates of pending order issues? - mql4

Question

My code below places sell pending orders when certain candle patterns are met on the H_1 chart. But duplicate pending orders are created when I change the chart timeframe and return to H_1. Also old orders that should have hit stop loss or take profit seem to still be open.
I need to have multiple pending orders, but the duplicates and orders that should have closed are not wanted. How can I solve this?
string prefix = "HG";
const int N_bars = 1;
int numBars = 1;
int numBarsArray[];
int tempVal = 0;
int NumOfDisplayBars = 300;
int count = 0;
extern double lotSize = 0.01;
int magicnumber = 1337;
void showRectangles()
{
for (int i=NumOfDisplayBars;i>=1;i--)
{
if(isBearishEngulfing(i))
{
drawBearRectangle(i + 1,iHigh(_Symbol,0,i + 1),iOpen(_Symbol,0,i + 1));
}
}
}
bool isBearishEngulfing(int current)
{
if( (iClose(_Symbol,0,current ) < iOpen( _Symbol,0,current ))
&& (iClose(_Symbol,0,current + 1) > iOpen( _Symbol,0,current + 1))
&& (iOpen( _Symbol,0,current ) > iClose(_Symbol,0,current + 1))
&& (iClose(_Symbol,0,current ) < iOpen( _Symbol,0,current + 1))
)
return true;
return false;
}
bool drawBearRectangle(int candleInt,const double top,const double bottom)
{
const datetime starts = iTime(_Symbol,0,candleInt);
const datetime ends = starts+PeriodSeconds()*N_bars;
const string name = prefix+"_"+(candleInt>0?"DEMAND":"SUPPLY")+"_"+TimeToString(starts);
if(!ObjectCreate(0,name,OBJ_RECTANGLE,0,0,0,0,0))
{
printf("%i %s: failed to create %s. error=%d",__LINE__,__FILE__,name,_LastError);
return false;
}
ObjectSetInteger(0,name,OBJPROP_TIME1, starts);
ObjectSetInteger(0,name,OBJPROP_TIME2, ends);
ObjectSetDouble( 0,name,OBJPROP_PRICE1,bottom);
ObjectSetDouble( 0,name,OBJPROP_PRICE2,top);
ObjectSetInteger(0,name,OBJPROP_COLOR, clrChocolate);
ObjectSetInteger(0,name,OBJPROP_STYLE, STYLE_DASHDOT);
ObjectSetInteger(0,name,OBJPROP_WIDTH, 1);
ObjectSetInteger(0,name,OBJPROP_FILL, false);
if(_Period == 60){
double entryPrice=bottom-3*_Point;
double stopLoss=top;
double slDist=fabs(entryPrice-stopLoss);
double dTakeProfit=entryPrice-2*slDist;
int ticketSell = OrderSend(Symbol(),OP_SELLLIMIT,lotSize, entryPrice,0,stopLoss,dTakeProfit,"SellOrder",magicnumber,0,Red);
}
return true;
}
void OnDeinit(const int reason){ObjectsDeleteAll(0,prefix);}
void OnTick()
{
if(!isNewBar())
return; // not necessary but waste of time to check every second
showRectangles();
}
bool isNewBar()
{
static datetime lastbar;
datetime curbar = (datetime)SeriesInfoInteger(_Symbol,_Period,SERIES_LASTBAR_DATE);
if(lastbar != curbar)
{
lastbar = curbar;
return true;
}
return false;
}

Answer 1

Q : How can I solve the duplicates of pending order issues?... when I change the chart timeframe and return to H_1.
Well, this is rather a feature of the MQL4/5 code-execution ecosystem.
Solution:
Configure a preventive checkmark, setup in MT4-Terminal in Tools > Options > Expert Advisor-tab so as to become:
[x] Disable automated trading when the chart symbol or period has been changed