如何从MetaTrader Terminal 5 MQL 5发布请求到我的MT5主机本地运行的nodejs服务器?

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问题描述

我试图在运行MetaTrader Terminal 5或4的同时，在我的nodejs服务器中获取外汇汇率，然后socke.io将其发送给客户端.

I'm trying to get FX rates in my nodejs server and socke.io emit them to the client, while running MetaTrader Terminal 5 or 4.

所以我想我必须使用MQL4/5.我知道如何在我的nodejs服务器中处理请求.我不知道在哪里编写MQL4代码，在MetaTrader终端中要配置什么.

So I guess I have to use MQL4/5. I know how the handle the request in my nodejs server. What I dont know is where to write the MQL4 code, what to config in my MetaTrader Terminal.

让我们说我想在每次更改时将EUR/USD出价汇率发送到我的nodejs服务器.如何使用MT4/5和MQL4/5实现这一目标?

Lets say I want to send EUR/USD bid rate to my nodejs server everytime it gets changed. How do I achieve that, using MT4/5 and MQL4/5?

我的nodejs代码:

My nodejs code:

app.post('/fxroute', (req, res) => {
   console.log(req);
   let fxRates = req.body // dont know if the payload will be in body
   socket.emit('fxRates', fxRates);
});

MQL5脚本:

#property copyright "Copyright 2017, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
//+------------------------------------------------------------------+
//| Script program start function                                    |
//+------------------------------------------------------------------+
void OnStart(){
     string  headers;
     char    data[],
             result[];
     string             str = "data=value";        // POST-data, variables to send
     StringToCharArray( str,                data );
     string          b = CharArrayToString( data );
     Print( "Test:", b ); // just a test of data, if good ... OK, data was setup correctly.

     WebRequest( "POST",
                 "http://localhost:3000/fxroute",
                 NULL,
                 NULL,
                 3000,
                 data,
                 ArraySize( data ),
                 result,
                 headers
                 );
     Print( CharArrayToString( result ) );   // see the results
                                             // it returns
                                             // "Results:" No posted data.
  }

编译并运行时，我看到它是在"MT专家"选项卡中执行的，但是在我的nodejs服务器上，控制台什么都没记录.

When I compile and run, I see that it was executed in MT Experts tab, but on my nodejs server, console logs nothing.

工作计划:

启用 MT4/5以将 {http:|https:} 传输类用于所选目标

Enable MT4/5 to use {http:|https:} transport-class to selected targets

创建 MT4/5代码以执行某种基于{http:|https:}的服务

Create MT4/5 code to execute some kind of {http:|https:} based service

实施将端到端逻辑包装+隐藏在愚蠢的http协议交换中

Implement end-to-end logic to be wrapped + hidden inside the dumb http-protocol exchanges

1)终端权限:

使用终端->工具->选项启用 "允许WebRequest URL "以使用localhost 您选择的URL，与列表中的nodejs-server设置匹配

1) Terminal permissions:

Using Terminal->Tools->Options enable "Allow a WebRequest URL" to use a localhost {http:|https:} URL of your choice, matching the nodejs-server setup, in the list

根据您的意图，使用内置的IDE 或使用您的外部编辑器创建 MQL4 脚本选择并将生成的 .mq4 脚本文件保存在 ~an_MT4_Terminal_Home_Directory/MQL4/Scripts 目录中

Given your intentions, create an MQL4 script, using either a built-in IDE or using an external editor of your choice and save the produced .mq4 script file in ~an_MT4_Terminal_Home_Directory/MQL4/Scripts directory

事件循环主要是您的设计工作:

The event-loop is principally your design job:

int start() {
    while !isStopped() {                            // ACK LOOP
           if ( RefreshRates() ) {                  // NEW QUOTE has arrived
                ...                                 // JOB PROCESS Bid
                int aHttpRetCODE = WebRequest(...); // SIG-> NodeJS Server
                ...                                 // JOB PROCESS Response ( if a bi-directional service )
           }
           else {
                Sleep(...);                         // NOP on NACK, Terminal has nothing to do
           }
    }
}

For further details, may like to check my other posts on WebRequest() use-cases and warnings about it's principal limitations.

这是您的设计的极致之宝.

Here comes the creme-ala-creme of your design.

是的，有. 那将是我的选择之一-使用 ZeroMQ 或 nanomsg (MT4/5 Terminal& NodeJS)，因此能够完全.

Yes, there is. That would be the one of my choice - using ZeroMQ or nanomsg on both sides ( MT4/5 Terminal & NodeJS ), thus being able to fully enjoy the freedom of a full-scale distributed systems design.

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