MQL5 - Language of trade strategies built-in the MetaTrader 5 client terminal

Automated Trading and Strategy Testing Forum

MartinNevalyshkaMartinNevalyshka Try product
MartinNevalyshka
Author: cmillion
Subscribe to signal
LRDB
50.15%, 1 501.52 USD
News VLine Script
News VLine
Author: Urain
How to Write an Indicator on the Basis of Another Indicator How to Write an Indicator on the Basis of Another Indicator Screenshot
EURUSD, D1
Real

// Floating point type bug in 64bit version

To add comments, please log in or register
Mariusz Woloszyn
30
emsi 2010.10.11 20:34

Hi!

I have experienced strange problem in 64bit version of MT5 when the function is imported from the external library.

I have created a sample function in C:

double __stdcall test_double(double d)
{

    return (d*1.22);

}


and declared it in MQL:

double test_double(double d);

When invoked in MQL like that:

Print ("test_double:"+test_double(100));


I got:

2010.10.11 18:12:42    double_bug (EURUSD,H1)    test_double:-1.#IND


The very same code works like a charm when recompiled for an run under 32 bit MT5 platform.

It's very strange as double and float data types are standard across all platforms and do not depend on the architecture.

Later I redefined the routine to:

double __stdcall test_double(double d)
{

    return (1.22);

}


And got the very same result.

Looks like a terminal bug.

How to Develop an Expert Advisor using UML Tools
This article discusses creation of Expert Advisors using the UML graphical language, which is used for visual modeling of object-oriented software systems. The main advantage of this approach is the visualization of the modeling process. The article contains an example that shows modeling of the structure and properties of an Expert Advisor using the Software Ideas Modeler.
alexvd alexvd
Moderator
1891
alexvd 2010.10.12 10:36

Thanks for message.

We'll check it.

Ilyas
704
mql5 2010.10.12 11:08
Thank you for your message. Bug fixed. Please wait for updates.

Mariusz Woloszyn
30
emsi 2010.10.12 11:27

Thank you for your quick reaction :)

Any hint when I can expect new build?

Mariusz Woloszyn
30
emsi 2010.10.18 12:21

Hi!

I just got the new build (344 of Ocrober 15th) yet the problem still persists.


Ilyas
704
mql5 2010.10.18 12:34
To solve this problem, your mq5 file must be recompiled

Mariusz Woloszyn
30
emsi 2010.10.18 13:50

Confirmed, it works once recompiled.

Thank you :)

/
To add comments, please log in or register