Passing data from one MT4 client to another

Quoting rangebound

Disliked

I threw this together between trades so its not the most amazing piece of code but it works

What can I say ... I was bored and feeling generous at the same time !!!

What is it :

A DLL and example EA (with source) to allow cross talk between two MT4 Apps on the same machine, using a FIFO text string message queue.

Only run one copy of the EA on a single MT4 APP and apply it to no more than 2 separate MT4 Apps on the same machine.

I wouldnt advise trying to use it in strategy tester but it may work in visual mode.

Usage
copy EX4 & MQ4...

Ignored

Quoting rangebound

Disliked

I threw this together between trades so its not the most amazing piece of code but it works

What can I say ... I was bored and feeling generous at the same time !!!

What is it :

A DLL and example EA (with source) to allow cross talk between two MT4 Apps on the same machine, using a FIFO text string message queue.

Only run one copy of the EA on a single MT4 APP and apply it to no more than 2 separate MT4 Apps on the same machine.

I wouldnt advise trying to use it in strategy tester but it may work in visual mode.

Usage
copy EX4 & MQ4...

Ignored

Quoting dinhero

Disliked

So do you have any idea about this possibility : I mean sending Ordersend to the metatrader just by sending the correct message to his windows handle ?

Ignored

If getcsvstr(msg,1) == "NEWORDER" 
{
  if (getcsvstr(msg,3) == "MARKET")
 { 
   if (getcsvstr(msg,4) == "BUY")
    {
 OrderSend(getcsvstr(msg,2),OP_BUY,strtodouble(getcsvstr(msg,5),0),bid,0,0,0,"",0);
    }
    else
    {
       /// SELL order
     }
 }
else
 {
   // open pending order
 }
}

Quote

Disliked

protected override void OnBarUpdate()
{
System.IO.FileStream wFile;
byte[] byteData = null;
byteData = Encoding.ASCII.GetBytes("BUY");
if(Close[0]>Open[0] ) //This is the signal condition, when open>close, just an example
{
wFile = new FileStream("c:MetaTrader 4expertsfilesbuy.csv", FileMode.Append);
wFile.Write(byteData, 0, byteData.Length);
wFile.Close();
}

Quote

Disliked

bool buyOrder = false;
int start()
{
int handle;
int i;
for(i=0;i<100000;i++)
{
handle=FileOpen("buy.csv",FILE_CSV|FILE_READ,';');
if(handle==1)
{
buyOrder=OrderSend(Symbol(),OP_BUY,1,Ask,10,Ask-200*Point,Ask+100*Point,"buy",0,0,CLR_NONE);
FileClose(handle);
FileDelete("buy.csv");
}
Sleep(1000);
}
return(0);

Quoting CodeMeister

Disliked

There is nothing obviously wrong with the code.

Which leads to the obvious question, did you check the MT4 journal for errors? Was a "buy.csv" file present in the folder?

How many times has this happened? Once? Twice? More?

Ignored

Quoting Kenz987

Disliked

First, you need error checking code in each piece of code to handle a locked file condition. I think NT will just stop working if it gets a clash without a "try".

A better solution is here:
http://www.forexfactory.com/showthre...=125117&page=2

Ignored

Quoting Kenz987

Disliked

The try-catch block in NT:
try {
File.AppendAllText(sPath, sLine);
}
catch (Exception ax) {
Print("ax, " + ax.ToString());
}
...
Look on MSDN for explanation. I don't use it for anything more than this, no retry code or anything, but it keeps NT from stopping. You can set a switch and retry next time thru and beef it up a bit.
On the MT4 side, just check the return codes from the file open and read.
...
ps: Looking back at your code, file handles are large integer numbers, probably never equal to 1.

Ignored

Quoting Kenz987

Disliked

As per one of my previous posts in this thread, I never got NamedPipes working the way I wanted, but I did get MailSlots working. I never did finish the implementation, but the test code I have probably works. It was tedious, mainly because the .net and c-sharp syntax was new to me, and the "help" folks at NT support do not offer any help on these kinds of projects. Since it is still in test mode, I would rather not post it here, but if you send me your email addr I will send you what I have. kenz987 at yahoo dot com
ps: sangmane's code might...

Ignored

Quoting rangebound

Disliked

Creating a shared resource...

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Quoting rangebound

Disliked

Creating a shared resource as per that thread will only work within the frame work of the same instance of a process/application

So for example if you had an indicator (that uses a DLL) and attached to several charts in the same MT4 app then they would all open an instance of the DLL using the Hinstance handle of the MT4 App. They would be able to share the memory, because each instance of the DLL was opened with the same Hinstance handle of the same MT4 application.

You want to talk between two MT4 Apps. Each MT4 App has its own Hinstance...

Ignored