Questions from Beginners MQL4 MT4 MetaTrader 4 - page 210

Can't the opening of a new one be checked as the previous one closed?

Salud!

In mt5 there is an option "Trade history", when it draws levels of closed trades (by connecting with a line opening and closing... the screenshot shows what I mean). Is there a possibility to do it programmatically in mt4, something like on/off? Or does it have to be done independently and built?

I don't understand! reformulate the question!

int i, eTotal=OrdersTotal();
for(i=0; i<eTotal; i++)
   {
   if(!OrderSelect(i,SELECT_BY_POS,MODE_TRADES)) continue;
   printf(OrderSymbol()+" : "+IntegerToString(OrderType())+" : "+DoubleToString(OrderOpenPrice(),
Digits)+" : "+DoubleToString(OrderLots(),2));
   }

Greetings. Can you advise me?

I am making "arbitrage" EAs, which work on two terminals from different brokers and transmit Ask and Bid to each other. I have done so by writing the structure in binary file and reading the file by another EA.

The speed of transfer is proportional to frequency of reading/writing.

How "harmful" for the disk is such a thing, if frequency is, let's say, 10 times per second?

How can you make the data transfer not through the disk?

Andrew, reduce the number of reads and writes to the file. If the price has not changed by more than N points, don't pass anything. This way the number of records will drop significantly. And for reading, use file-flag. If this file exists, read binary and delete file-flag. If it doesn't exist, it doesn't. From 10 times per second you get 1 time per minute

Aleksei Stepanenko, Vladimir Simakov thank you.