How to make 2 MT4 EAs to communicate on different platforms | Forex Factory

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How to make 2 MT4 EAs to communicate on different platforms

  • #1
  • First Post: Feb 21, 2013 6:37am Feb 21, 2013 6:37am
Hi,

How can I make 2 EAs to communicate with each other? One EA running on broker1, other running on broker2? How can I send/receive variables between them?
Do I need to 3rd party bridge?
Keep It Simple
  • #2
  • Feb 21, 2013 7:59am Feb 21, 2013 7:59am
Quoting kis
Hi,

How can I make 2 EAs to communicate with each other? One EA running on broker1, other running on broker2? How can I send/receive variables between them?
Do I need to 3rd party bridge?
Either you construct your own bridge or you need a 3rd party bridge.

Your own bridge: A file which is used by both EAs.

3rd party: gooogle "Permvar" , it is from fx1.net , it has all you need.
  • #3
  • Feb 21, 2013 8:22am Feb 21, 2013 8:22am
Thank you, I'll take a look on "Permvar". Do I understand well, that it uses the win registry as bridge? Is that safe?
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  • #4
  • Feb 21, 2013 8:54am Feb 21, 2013 8:54am
Quoting kis
Thank you, I'll take a look on "Permvar". Do I understand well, that it uses the win registry as bridge? Is that safe?
I am not a PC expert, but if you donīt trust a third party DLL, nothing is safe and you
have to build the bridge yourself.
I just use PermVar, but not everybody would do that.
  • #5
  • Feb 21, 2013 9:02am Feb 21, 2013 9:02am
Quoting fxtr51
I am not a PC expert, but if you donīt trust a third party DLL, nothing is safe and you
have to build the bridge yourself.
I just use PermVar, but not everybody would do that.
It's not that I don't trust third party DLL. I'm also not a PC expert, but I as I know its easy to mess up the win registry.

If you say that you use PermVar, and your system is ok, probably is safe.
BTW there are great tools on that page, specially the MT4Ticker.
Keep It Simple
  • #6
  • Edited 10:37am Feb 21, 2013 9:59am | Edited 10:37am
Quoting kis
It's not that I don't trust third party DLL. I'm also not a PC expert, but I as I know its easy to mess up the win registry.

If you say that you use PermVar, and your system is ok, probably is safe.
BTW there are great tools on that page, specially the MT4Ticker.
PermVar must be safe, otherwise there would be warnings about it.

I use Mt4Ticker every day. It is safe too and since fx1net has been selling the Guardian and other
protection software since 2008, they would be insane to offer malware or a product which
is doing harm to the registry. Makes no sense at all.

Somehow I sound like a sales representative of fx1net, but I am not.
I just use some of their free tools every day, that is all.
  • #7
  • Feb 21, 2013 10:29am Feb 21, 2013 10:29am
Quoting fxtr51
PermVar must be safe, otherwise there would be warnings about it.

I use Mt4Ticker every day. It is safe too and since fx1net has been selling the Guardian and other
protection software since 2008, they would be insane to offer malware or a product which
is doing harm to the registry. Makes no sense at all.

Somehow I sound like a sales representative of fx1net, but I am not.
I just some of their free tools every day, that is all.
Don't get me wrong, I don't think you are their sales man.
I appreciate your help. Thank you.
Keep It Simple
  • #8
  • Feb 21, 2013 12:27pm Feb 21, 2013 12:27pm
You can try Fling. It's shareware that can synchrnonize directories if there's a change detected.

http://www.nchsoftware.com/ftp/index.html
  • #9
  • Feb 21, 2013 1:44pm Feb 21, 2013 1:44pm
Using files to communicate between two processes is a last resort if nothing else is within your skill set. The proper way is with named pipes (on the same machine) or sockets if on a network.

Another possibility is MTBRidge. The description sounds good, that is as much as I know about it.

http://itvex.com/
  • #10
  • Feb 21, 2013 2:17pm Feb 21, 2013 2:17pm
Quoting CodeMeister
Using files to communicate between two processes is a last resort if nothing else is within your skill set. The proper way is with named pipes (on the same machine) or sockets if on a network.
Yes.
Named pipes are way beyond my skills, thatīs why I suggested the easy solution.
  • #11
  • Feb 21, 2013 3:13pm Feb 21, 2013 3:13pm
Quoting jadedmikey
You can try Fling. It's shareware that can synchrnonize directories if there's a change detected.

http://www.nchsoftware.com/ftp/index.html
Thank you I'll take a look.
Keep It Simple
  • #12
  • Feb 21, 2013 3:22pm Feb 21, 2013 3:22pm
Quoting CodeMeister
Using files to communicate between two processes is a last resort if nothing else is within your skill set. The proper way is with named pipes (on the same machine) or sockets if on a network.

Another possibility is MTBRidge. The description sounds good, that is as much as I know about it.

http://itvex.com/
Thank you. I'll check this one as well.
Keep It Simple
  • #13
  • Feb 21, 2013 3:31pm Feb 21, 2013 3:31pm
Quoting fxtr51
Yes.
... I suggested the easy solution.
Your suggestion it seems real easy, and I can use it for what I need.
I stared to learn "programming" with mql4, what in the beginning looked like something very complicated, now it looks easy, but I don't really have an idea how different softwares communicate with each other, so I thought there might be a good step by step guide how to build bridge... or something like that.
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  • #14
  • Feb 21, 2013 3:40pm Feb 21, 2013 3:40pm
The easiest is to write to a csv file in experts/files for both brokers, then create an app that reads both files every x secs and the app will process the data and then create a 3rd file which can then be read using mql code.

Another method is to write a DLL in C++.

You can also use the registry, which is exactly the same method as writing to files but you're using RAM.

Read 7bit's post at the bottom of this page; he's a guru:

Quote
I don't think you need a RAM disk. Windows' disk cache (which is by default activated for all non-removable media) will cache the write and make it at the same time available for all read operations which will then be served directly from the cache. The written data should be available immediately after flush().

flush() will write to the cache, not the disk, so it is fast. The disk cache is one level deeper and transparent to all userland file functions (The disk cache behaves like it *is* the disk towards all layers above it,...
Politics is the womb in which war develops.
  • #15
  • Feb 21, 2013 3:52pm Feb 21, 2013 3:52pm
Quoting FiatFap
The easiest is to write to a csv file in experts/files for both brokers, then create an app that reads both files every x secs and the app will process the data and then create a 3rd file which can then be read using mql code.
:
That will not work. MQL4 file I/O is restricted to writing / reading files in its own workspace which is the experts/files folder for the platform. This is for security purposes to prevent malicious code from trashing the host system. It can be overcome with a windows DLL, but if you are going to that much effort, you should consider better ways. The OP got it right when he called it a bridge.
  • #16
  • Feb 22, 2013 3:37am Feb 22, 2013 3:37am
Quoting kis
Hi,

How can I make 2 EAs to communicate with each other? One EA running on broker1, other running on broker2? How can I send/receive variables between them?
Do I need to 3rd party bridge?
Take a look at this provided by Metaquotes: http://forum.mql4.com/54147
20 pips a day isn't too much to ask . . .
  • #17
  • Feb 22, 2013 4:28am Feb 22, 2013 4:28am
Quoting FiatFap
The easiest is to write to a csv file in experts/files for both brokers, then create an app that reads both files every x secs and the app will process the data and then create a 3rd file which can then be read using mql code.
I tried with cvs, and file synchronization before, but didn't work as I would like.

Quote
Another method is to write a DLL in C++.

I have to learn C++ programming for that, and I don't know what level of C++ programming knowledge is enough to create such thing.

Quote
You can also use the registry, which is exactly the same method as writing to files but you're using RAM.

Probably I'll use registry.

Quote
Read 7bit's post at the bottom of this page; he's a guru:

Thanks, I'll check.
Keep It Simple
  • #18
  • Last Post: Feb 22, 2013 4:29am Feb 22, 2013 4:29am
Quoting RaptorUK
Take a look at this provided by Metaquotes: http://forum.mql4.com/54147
Thank you.
Keep It Simple
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