How to share data between 2 MT4 sessions? | Forex Factory

Options

Permalinks
Print Thread

Similar Threads

4 sessions for i-Sessions Indicator 7 replies

To Share or not to Share strategy? 61 replies

Share whatever you are willing to share 27 replies

quad core multiple CPU's, multiple MT4 sessions, Virtual Machine 53 replies

Can MT4 display custom sessions 0 replies

Attachments: How to share data between 2 MT4 sessions?
Exit Attachments

How to share data between 2 MT4 sessions?

  • #1
  • First Post: Feb 2, 2011 4:43am Feb 2, 2011 4:43am
Hi,
I am attempting to develop an EA which requires me to exchange Ask/Bid data between two separate MT4 instances. I would like to avoid using the hard drive to store/access the data because I do not want lag. I most likely need to create a DLL file to share the data- which is fine. But even a DLL file will create a separate instance of its global variables; it will not share the memory space.

I am not a C++ programmer but I am not afraid of having to do a little learning first - so can someone please point me to some code that will allow me to share data in this manner?
  • #2
  • Feb 2, 2011 5:03am Feb 2, 2011 5:03am
There have been a number of previous discussions on this matter and I happen to have this one bookmarked. It will give you some ideas to get started with. You should also explore named pipes which is something I learned about recently. Sorry can't remember where.

http://www.forexfactory.com/showthread.php?t=249067
  • #3
  • Feb 2, 2011 9:29am Feb 2, 2011 9:29am
Thanks for the reply! I will definitely look into this.

I just realized that I can probably just inject the values straight into the other MT4 platform AND induce it to tick just by using the WinUser32 API....
  • #4
  • Feb 2, 2011 10:13am Feb 2, 2011 10:13am
there are many alternatives.
you can use named pipe:
http://www.forexfactory.com/showthread.php?p=4255705
or file mapping
http://msdn.microsoft.com/en-us/library/aa366537(v=vs.85).aspx
or wm_copydata (sample is in the link posted by CodeMeister above)

i have coded filemapping ea/script without the use of custom dll. it is far easier than named pipe. at least in the amount of code
Attached Image (click to enlarge)
Click to Enlarge Name: filemap.gif Size: 26 KB
  • #5
  • Feb 2, 2011 2:44pm Feb 2, 2011 2:44pm
Quoting sangmane
there are many alternatives.
you can use named pipe:
http://www.forexfactory.com/showthread.php?p=4255705
or file mapping
http://msdn.microsoft.com/en-us/library/aa366537(v=vs.85).aspx
or wm_copydata (sample is in the link posted by CodeMeister above)

i have coded filemapping ea/script without the use of custom dll. it is far easier than named pipe. at least in the amount of code
Would you mind posting a copy of your EA code, I would like to learn how this is done. If you are keeping it proprietary, I understand. thanks scott
  • #6
  • Feb 4, 2011 8:28am Feb 4, 2011 8:28am
hi scott,

please find the attached EA/script

for master (MT4 instance that send tick), i use EA
for client (MT4 instance that receive tick) i use script with a while loop to make sure i can catch most of the tick data

let me know how it works on your side

stephen
Attached File(s)
File Type: mq4 MapServer.mq4   2 KB | 1,475 downloads
File Type: mq4 MapClient.mq4   2 KB | 1,289 downloads
  • #7
  • Feb 6, 2011 7:44pm Feb 6, 2011 7:44pm
Very useful stuff guys, thanks for the info.
  • #8
  • Mar 16, 2011 2:13am Mar 16, 2011 2:13am
What is the best way to share data between multiple sessions' testers? Right now I am using named pipes but it seems somewhat unstable (not thread safe?)
  • #9
  • May 21, 2011 3:14pm May 21, 2011 3:14pm
Quoting sangmane
hi scott,

please find the attached EA/script

for master (MT4 instance that send tick), i use EA
for client (MT4 instance that receive tick) i use script with a while loop to make sure i can catch most of the tick data

let me know how it works on your side

stephen
Stephen, Thanks for sharing this fantastic example with both server and client code. This is very helpful! +v
  • #10
  • Jul 6, 2011 10:27am Jul 6, 2011 10:27am
Sangme,

Have you done this via DLL? I have been trying for a while now and can't seem to get it to to work.

If you have bee successful, can you post code? I'd like to compare it to mine to see where I'm getting this wrong. I've bee using C++ in Visual Studio 2010.

Quoting sangmane
there are many alternatives.
you can use named pipe:
http://www.forexfactory.com/showthread.php?p=4255705
or file mapping
http://msdn.microsoft.com/en-us/library/aa366537(v=vs.85).aspx
or wm_copydata (sample is in the link posted by CodeMeister above)

i have coded filemapping ea/script without the use of custom dll. it is far easier than named pipe. at least in the amount of code
  • #11
  • Jul 12, 2011 1:55pm Jul 12, 2011 1:55pm
Quoting sangmane
hi scott,

please find the attached EA/script

for master (MT4 instance that send tick), i use EA
for client (MT4 instance that receive tick) i use script with a while loop to make sure i can catch most of the tick data

let me know how it works on your side

stephen
I tried to use these 2 and for some reason the client side data started to become 0 after a while.

I tried to use the client as script or EA, both worked but have the same problem.

I can't really detect anything from the code though. Anyone can help?
Wise-EA MT4 Programming
  • #12
  • Aug 27, 2011 9:31am Aug 27, 2011 9:31am
This mean, If I have mapserver on one brokert mt4 and another mapclient on second mt4 and I see some shift price how can enter?

Wich is the "future"/fast price?
The deviation change fast, so I can not enter manually.

Some idea for practical trading with these indicators?

It is a interesting idea/indicator

Thanks
  • #13
  • Last Post: Aug 28, 2011 4:59pm Aug 28, 2011 4:59pm
here's the link to the thread:
http://www.forexfactory.com/showthread.php?t=310349
0 traders viewing now