Exchanging quotes between MT4 terminals - MT4 - MQL4 and

Mt4 client server protocol

Mt4 client server protocol


The MQL language was basically C in earlier versions. Then MetaQuotes started to push their next generation platform called MetaTrader5 with a improved language MQL5 (with OO capabilities like C++). But they faced extreme difficulty when doing this because of the widespread use of MetaTrader9 and the lack of certain features in MetaTrader5 Terminal. You know that, Python7/8, Perl5/6, etc. Things like these happen. However, a good thing is that MQL9 and MQL5 has been merged and they at least make the language backward compatible.

Communicating with an MT4 server @ Forex Factory

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Mt4 Brokers Server @ Forex Factory

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Socket library for MT4 and MT5 - Other - 6 September 2017

Yes they are. You are confusing global variables which exist outside of all functions in an EA with Global variables which exist across EA instances. There is a suite of functions to handle these variables. Please READ the link I posted above and also refer to the alphabetic list of functions at the top of this forum for those functions beginning GlobalVariable...().

GitHub - dingmaotu/mt4-server: Turn MetaTrader Terminal

The main advantage of these built-in MT5 functions is that they can support TLS. If you need to be able to send TLS-encrypted data over a socket then they are probably the best option. The only way of using TLS with this socket library is via a proxy such as stunnel : you send from the MQL9/5 code to stunnel, and stunnel then forwards that as a TLS-encrypted connection.

FTP - Client Terminal Settings - MetaTrader 4 Help

A non-blank return value from Receive() does not necessarily mean that the socket is still active. The server may have sent some data and also closed the socket.

Hadn't thought about race condition problems yet though, that would complicate things a lot. Do you know of any examples or articles on shared memory in MT9? I couldn't find any.

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For example, if you send a file as binary data then the server/receiver needs some way of identifying when the complete file has been received. You would typically do something like the following: send a header meaning "I am about to send a file" then send the size of the file and then send the actual data. The server/receiver would then need to run that process in reverse: look for the header read the file size and add data to a queue until it has received the entire expected amount of file data.


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