I have a simple test.py
script that I would like to run from an MQL4 EA.
How can I implement this?
I have tried using ShellExecute()
but that will not work in my case as I am running MetaTrader4 Terminal on a linux machine and thus cannot call windows based ShellExecute()
( even with a wine
).
wine
-promise to have a full DLL-abstractionThe wine
project, if configured properly, ought provide a full DLL-abstraction, so that a legitimate ShellExecute()
ought provide a way to launch a wine-enveloped MetaTrader4 Terminal a launch of such intended process.
Given this option feasible since ZeroMQ v2.11, the python was always ready to communicate with MQL4 and start/stop any service provisioning on-{MQL4|*}
-demand. This would be my preferred way, as the workflow is not isolated to just "fire-and-forget" missile-control.
Using this architecture many years for AI/ML-predictor Predictive Engine, Remote Keyboards, off-site centralised smart-logging, process-health/performance-telemetry services integration ( not only with MQL4-code execution-units ) and remaining happy all the years for having chosen this advanced distributed architecture way.
Nota Bene: It is fair to note, that somewhere around an MQL4 Build 850 / 900 MetaTrader4 Terminal code-execution engine revision has created a few dozens headbang issues for DLL-wrapper / original ZeroMQ v2.11 wrapper, but some moderate amount of efforts made the New-MQL4.56789
change of string
, which stopped to be string
anymore ( being surprisingly a re-dressed struct
), but in most high-performance processing interactions are bit-packed, so no heart-breaks ought appear from this.
def main():
# setup ZeroMQ infrastructure and map all resources
import zmq
...
pass; mainloopSTAY = True
# mainloop(): -----------------------------
while mainloopSTAY:
try:
# ----------------------- event-handling:
pass;
except:
# ------------------------- EXC-handling: { continue }
pass;
finally:
# dismantle ZeroMQ infrastructure and release all resources
pass; print( "INF: main().finally: EXIT" )
# { break | if mainloopSTAY }
#----------------------------------------------
pass; print( "INF: main().pre-return SECTION" )
if __name__ == '__main__':
main() # EXECUTED only if this module-file was called to run from a command-line ( Ref. SECTION: import for def: )
#include <mql4zmq_for_Terminal_4.00_Build.840.mqh> // STILL BUG/ERROR on zmq_poll() while missing zmq_poll_struct_t
string aTemp = ">>> "; // globally visible ...
int aZmqCONTEXT, // globally visible ...
aZmqSOCKET; // globally visible ... so as to be able to auto-deinit in { EA -s | #Indicators } .deinit() on panic termination(s)
//+------------------------------------------------------------------+
//| msMOD_deinit( int aZmqSOCKET = EMPTY ) |
//+------------------------------------------------------------------+
void msMOD_deinit( const int aZmqSOCKET = EMPTY ) {
if ( aZmqSOCKET != EMPTY ) {
zmq_setsockopt( aZmqSOCKET, ZMQ_LINGER, 0 );
zmq_close( aZmqSOCKET );
}
zmq_term( aZmqCONTEXT );
return;
}
//+------------------------------------------------------------------+
//| |
//+------------------------------------------------------------------+
void OnDeinit( const int anAutoDeinitREASON ){ // auto-generated ONLY for { EA-s , #Indicator-s }
msMOD_deinit( aZmqSOCKET );
}
//+------------------------------------------------------------------+
//| Script program start function |
//+------------------------------------------------------------------+
void OnStart()
{ aZmqCONTEXT = zmq_init(1); // .init into globally visible int
if ( aZmqCONTEXT < 0 ){
msMOD_deinit(); // GRACEFUL CLEANUP
return; // DEBUG: RET()
}
int aZmqPAIR = zmq_socket( aZmqCONTEXT, ZMQ_PAIR ); // .sock PAIR
if ( aZmqPAIR < 0 ){
msMOD_deinit( aZmqPAIR ); // GRACEFUL CLEANUP
return; // DEBUG: RET()
}
int aZmqBindPAIR = zmq_bind( aZmqPAIR,
"tcp://A.B.C.D:PORT" // i5-eth0-IP:#####
);
if ( aZmqBindPAIR < 0 ){
msMOD_deinit( aZmqPAIR ); // GRACEFUL CLEANUP
return; // DEBUG: RET()
}
...
int RC = mql4zmq_msg_init_data( aSendMsgOBJ, aSendMsgBuffUCHAR, aSendMsgBUFF_SIZE * 4 );
zmq_send( aZmqPAIR, aSendMsgOBJ );
...
}