Discussion about USD/EUR Chart

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Hi all,

I want to discuss about writing a script that could inverse a currency pair. I Got the below script from this topic: https://forum.mql4.com/35535 and i make some changes to get the real data from market.

But when you open the offline chart, the output of this script does not update in real time and it has 1 Bar delay.

If anyone can make changes in the below code in order to improve it, please share it.

Many thanks.


//+------------------------------------------------------------------+
//|                                             Period_Converter.mq4 |
//|                      Copyright © 2005, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2005, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"
#property show_inputs
#include <WinUser32.mqh>

int        ExtHandle=-1;
//+------------------------------------------------------------------+
//| script program start function                                    |
//+------------------------------------------------------------------+
int start()
  {
   int    i, start_pos, i_time, time0, last_fpos, periodseconds;
   double d_open, d_low, d_high, d_close, d_volume, last_volume;
   int    hwnd=0,cnt=0;
//---- History header
   int    version=400;
   string c_copyright;
   string c_symbol=StringSubstr(Symbol(), 3, 3)+StringSubstr(Symbol(), 0, 3);
   int    i_period=Period();
   int    i_digits=Digits;
   int    i_unused[13];
   
//----  
   ExtHandle=FileOpenHistory(c_symbol+i_period+".hst", FILE_BIN|FILE_WRITE);
   if(ExtHandle < 0) return(-1);
//---- write history file header
   c_copyright="(C)opyright 2003, MetaQuotes Software Corp.";
   FileWriteInteger(ExtHandle, version, LONG_VALUE);
   FileWriteString (ExtHandle, c_copyright, 64);
   FileWriteString (ExtHandle, c_symbol, 12);
   FileWriteInteger(ExtHandle, i_period, LONG_VALUE);
   FileWriteInteger(ExtHandle, i_digits, LONG_VALUE);
   FileWriteInteger(ExtHandle, 0, LONG_VALUE);       //timesign
   FileWriteInteger(ExtHandle, 0, LONG_VALUE);       //last_sync
   FileWriteArray(ExtHandle, i_unused, 0, 13);
//---- write history file
   periodseconds=i_period*60;
   start_pos=Bars-1;
   d_open = Open[start_pos];
   d_low  = Low [start_pos];
   d_high = High[start_pos];
   d_close = Close[start_pos];
   d_volume=Volume[start_pos];
   //---- normalize open time
   i_time=Time[start_pos]/periodseconds;
   i_time*=periodseconds;
   for (i = start_pos - 1; i >= 0; i--)
   {
      time0 = Time[i];
      
            //---- history may be updated
      if(i==0)
        {
         //---- modify index if history was updated
         if(RefreshRates())
            i=iBarShift(NULL,0,time0);
        }
      
      if (time0 >= i_time + periodseconds || i == 0)
      {
         if (i == 0 && time0 < i_time + periodseconds)
         {
            d_volume += Volume[0];
            if (Low [0] < d_low)  d_low  = Low [0];
            if (High[0] > d_high) d_high = High[0];
            d_close = Close[0];
         }
         last_fpos=FileTell(ExtHandle);
         last_volume=Volume[i];
         FileWriteInteger(ExtHandle, i_time, LONG_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_open,  i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_high,  i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_low,   i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_close, i_digits), DOUBLE_VALUE);

         FileWriteDouble(ExtHandle, d_volume, DOUBLE_VALUE);

         FileFlush(ExtHandle);
         cnt++;
         if(time0>=i_time+periodseconds)
           {
            i_time=time0/periodseconds;
            i_time*=periodseconds;
            d_open  = Open[i];
            d_low   = Low[i];
            d_high  = High[i];
            d_close = Close[i];
            d_volume=last_volume;
           }
        }
       else
        {
         d_volume += Volume[i];
         if (Low  [i] < d_low)  d_low  = Low[i];
         if (High [i] > d_high) d_high = High[i];
         d_close = Close[i];
        }
   } 
   FileFlush(ExtHandle);
   Print(cnt," record(s) written");
   int last_time=LocalTime()-5;
   
   while ((IsStopped() == false) && (IsConnected() == true))
   {
      int cur_time=LocalTime();
      //---- check for new rates
      if(RefreshRates())
        {
         time0=Time[0];
         FileSeek(ExtHandle,last_fpos,SEEK_SET);
         //---- is there current bar?
         if(time0<i_time+periodseconds)
           {
            d_volume+=Volume[0]-last_volume;
            last_volume=Volume[0]; 
            if (Low[0]<d_low) d_low=Low[0];
            if (High[0]>d_high) d_high=High[0];
            d_close=Close[0];
           }
         else
           {
            //---- no, there is new bar
            d_volume+=Volume[1]-last_volume;
            if (Low[1]<d_low) d_low=Low[1];
            if (High[1]>d_high) d_high=High[1];
            //---- write previous bar remains
            FileWriteInteger(ExtHandle, i_time, LONG_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_open,  i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_high,  i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_low,   i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_close, i_digits), DOUBLE_VALUE);
            FileWriteDouble(ExtHandle, d_volume, DOUBLE_VALUE);
            last_fpos=FileTell(ExtHandle);
            //----
            i_time=time0/periodseconds;
            i_time*=periodseconds;
            d_open=Open[0];
            d_low=Low[0];
            d_high=High[0];
            d_close=Close[0];
            d_volume=Volume[0];
            last_volume=d_volume;
           }
         //----
         FileWriteInteger(ExtHandle, i_time, LONG_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_open,  i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_high,  i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_low,   i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, NormalizeDouble(1/d_close, i_digits), DOUBLE_VALUE);
         FileWriteDouble(ExtHandle, d_volume, DOUBLE_VALUE);
         FileFlush(ExtHandle);
         //----
         if(hwnd==0)
           {
            hwnd=WindowHandle(Symbol(),i_period);
            if(hwnd!=0) Print("Chart window detected");
           }
         //---- refresh window not frequently than 1 time in 2 seconds
         if(hwnd!=0 && cur_time-last_time>=2)
           {
            PostMessageA(hwnd,WM_COMMAND,33324,0);
            last_time=cur_time;
           }
        } 
     }    
   return(0);
}

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void deinit()
  {
   if(ExtHandle>=0) { FileClose(ExtHandle); ExtHandle=-1; }
  }
//+------------------------------------------------------------------+
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