metatrader5 eventhänling

[Aylin]

Project description:

 

The DLL Can be loaded into MT5, the public static functions from the project dll can be called too. Now we need to implement some event handling in mt5 – like for the Cloud Connection Status Update.

 

 

Problem description:

 

In the DLL is a function named Authenticate() – this function is triggering the event , which must be triggered down to our mt5 Expert Advisor.

 

 

This is the Authenticate function

 

 [DllExport("Authenticate", CallingConvention = CallingConvention.StdCall)]

        [return: MarshalAs(UnmanagedType.Bool)]

        public static bool Authenticate([MarshalAs(UnmanagedType.LPWStr)] string username)

        {

            try

            {

  //do some stuff

                RaiseConnectionUpdate("Open");

            }

            catch (Exception ex)

            {

                //WriteError(ex.Message);

                throw ex;

            }

            return true;

        }

 

 

 

 

 

This is the event implementation in the DLL:

 

private static void RaiseConnectionUpdate(string Status)

        {

            RaiseConnectionStateUpdateEvent("StatusEvent", new XTConnectionStateUpdateEvent(Status));

        }

 

 

 

 

public class XTConnectionStateUpdateEvent : EventArgs

        {

            public XTConnectionStateUpdateEvent(string Status) : base() { connectionstate = Status; }

 

            private string connectionstate;

            public string ConnectionState

            {

                get { return connectionstate; }

                set { connectionstate = value; }

            }

        }

 

 

 

public static event EventHandler<XTConnectionStateUpdateEvent> RaiseConnectionStateUpdateEvent;

        static void OnRaiseConnectionStateUpdateEvent(XTConnectionStateUpdateEvent e)

        {

            EventHandler<XTConnectionStateUpdateEvent> handler = RaiseConnectionStateUpdateEvent;

 

            // Event will be null if there are no subscribers

            if (handler != null)

            {

 

                // Use the () operator to raise the event.

                handler(null, e);

            }

        }

 

 

 

Before authenticate() can be called, we need to setup the event listening -

In mql5 we need these c# functions:

 

public void AddEventListeners(){

RTGNinjaCloud.RaiseConnectionStateUpdateEvent += XTHandler_RaiseConnectionStateUpdateEvent;

}

 

private void XTHandler_RaiseConnectionStateUpdateEvent(object sender, RTGNinjaCloud.XTConnectionStateUpdateEvent e)

        {

Print  “done”;

        }

 

 

I have tried some code like this:

 

typedef int (__stdcall * Callback)(const char* text);

Callback Handler = 0;

extern "C" __declspec(dllexport)

void __stdcall SetCallback(Callback handler) {

  Handler = handler;

}

extern "C" __declspec(dllexport)

void __stdcall TestCallback() {

  int retval = Handler("hello world");

}

 

 

 

…that needs some .h files to include:

#include "stdafx.h"

#include "iostream.h"

 

But these files cannot be found..

 

can't open "C:\Users\ccs\AppData\Roaming\MetaQuotes\Terminal\65D1CFCD3F6A1A06FDD09AF8B01AA7EF\MQL5\Experts\RTG\stdafx.h" include file        

 

Need these files to be downloaded each?

Is there a way to install/use those precompiled headers?

What is the mt5 code for this simple event handling?

 

 

[Lars Rompe]

If is your header file is in the same folder like your program (script, EA or indicator) then include file must have quotation marks (#include "stdafx.mqh").

If is it in another folder (include or libraries) then it must be in angle brackets (#include <stdafx.mqh>)

Your includes should be located in the includes folder to avoid programming issues.

Hope this solves your problem....

[Lars Rompe]

Btw: This isn't German ;-)