How to get a value from Custom Indicator with zmq?

Question

I have an MQL4 Custom Indicators and I make the EA ( an Expert Advisor ) to get data into MetaTrader Terminal 4 ( mt4 ).

But, how can I import my custom indicators EA to client zmq to get the value ?

Answer 1

Q : But, how can I import my custom indicators EA to client zmq to get the value ?

Your MQL4-side ExpertAdvisor code or Script ( not the CustomIndicator one) has to import a DLL first. Then your EA code becomes capable to either zmq_bind() and receive a remote python-code .connect()-s, or ( reciprocally ) zmq_connect() to a remote python-code .bind()-exposed ZeroMQ's AccessPoint address ( via any feasible transport-class { tcp:// | pgm:// | epgm:// | vmci:// | ... } ( depends on ZeroMQ API-version implemented in DLL-wrapper ( 've been using a v2.11 one ) and on the selected ZeroMQ Scalable Formal Communications Pattern Archetype(s) )

Having done any form or shape of this above sketched interconnect meta-plane, your code can zmq_send() / zmq_receive() data in whatever scenario you opt to implement. Just serialise / deserialise data and zmq_send() them.

extern string ZMQ_transport_protocol = "tcp";
extern string ZMQ_address            = "192.168.0.386";
extern string ZMQ_outbound_port      = "1985";

// Include the libzmq.dll abstration wrapper.
#include <mql4zmq.mqh>

---

...
//+------------------------------------------------------------------+
int init()
{
   int major[1],
       minor[1],
       patch[1];

   zmq_version( major, minor, patch );

   Print( "Using ZeroMQ version " + major[0] + "." + minor[0] + "." + patch[0] );
   Print( ping( "Hello World" ) );
   
   Print( "NOTE: to use the precompiled libraries you will need to have the Microsoft Visual C++ 2010 Redistributable Package installed. To Download: http://www.microsoft.com/download/en/details.aspx?id=5555" );
   
   context = zmq_init( 1 );
   speaker = zmq_socket( context, ZMQ_PUB );
   
   outbound_connection_string =         ZMQ_transport_protocol
                              + "://" + ZMQ_server_address
                              + ":"   + ZMQ_outbound_port;

   if ( zmq_connect( speaker, outbound_connection_string ) == -1 )
   {
      Print( "Error connecting the speaker to the listener's address:port!" );
      return( -1 );
   }
   return( 0 );
}

---

//+------------------------------------------------------------------+
//| Script start function -OR- re-use as an Expert Advisor int OnTick(...){...} template
//+------------------------------------------------------------------+
int start()
{
   ...

// Publish current tick value + any iCustom(...) data

   string current_tick = "tick|" + AccountName() + " " + Symbol() + " " + Bid + " " + Ask + " " + Time[0];

   if ( s_send( speaker, current_tick ) == -1 )
        Print( "Error sending message: " + current_tick );
   else
        Print( "Published message: " + current_tick );

   return(0);
  }

---

//+------------------------------------------------------------------+
//| expert deinitialization function                                 |
//+------------------------------------------------------------------+
int deinit()
{
   Comment( "Going to tidy-up..." );

// Protect against memory leaks on shutdown.
   zmq_close( speaker );
   zmq_term(  context );

   return(0);
  }