Discussion of article "Ready-made Expert Advisors from the MQL5 Wizard work in MetaTrader 4"

[MetaQuotes]

New article Ready-made Expert Advisors from the MQL5 Wizard work in MetaTrader 4 has been published:

The article offers a simple emulator of the MetaTrader 5 trading environment for MetaTrader 4. The emulator implements migration and adjustment of trade classes of the Standard Library. As a result, Expert Advisors generated in the MetaTrader 5 Wizard can be compiled and executed in MetaTrader 4 without changes.

On the EURUSD M15 chart, the Expert Advisor trading looks good, including the way it sets the stop loss and take profit levels.

A chart window, demonstrating the work of an EA from the MetaTrader 5 Wizard in MetaTrader 4

Author: Stanislav Korotky

[Chris Mukengeshayi]

Good day Mr Stanislav Korotky, I hope you are doing good.

I have find you article very interesting and I have try to follow your instruction on how make a ready-made MT5 EA be compatible to run in MT4.

But I getting the following error, could you please guide me on how to resolve the error?

what I did after following your instruction was: I just copy the MQL5 source file and the MQL5 Program then follow by pasting it into the main directory of Expert folder

and I got so many error.

Could you tell me how can I proceed on making the generated EA of MQL5 work in MT4?

Bellow are the attached error images.

[Stanislav Korotky]

Chris Lazarius:

what I did after following your instruction was: I just copy the MQL5 source file and the MQL5 Program then follow by pasting it into the main directory of Expert folder

and I got so many error.

I don't understand what you mean. You need to unzip the provided patch for MT4 library into MQL4/Include folder. MT5Bridge.mqh header is also required.

How did you get the source code of your expert adviser in MQL5? Only experts generated by MQL Wizard are supported.

[Stanislav Korotky]

After some investigation of the use-case above I can now make a note:

Don't forget to change your expert file extension from mq5 to mq4 after you copy it to MQL4/Experts folder and before compilation.

MetaEditor can compile both MQL4 and MQL5, but MQL5 internally provides many built-in types which will interfere with emulated types introduced in the MT5Bridge.mqh. This will not and is not intended to compile.