Need help interfacing a Matlab DLL with Metatrader

HI all,

I already interfaced a VC++ dll with Metatrader but now I would like to interface Matlab code with MQL code using a DLL.

I created a test.m file with only a simple function:

function output = AddTwo(x,y)
output = x + y;

then I created a Deployment project for a C++ Shared library, I added the test.m file and compiled everything making the dllTest.dll.

In a TestDLL.mq4 file I wrote:

#import "dllTest.dll"
double AddTwo( double x, double y )
#import

and in the body a simple:

Alert( AddTwo( 4.0, 6.0 ) );

Ofc it doesn't work, I obtain only a "cannot load library dllTest.dll (error 126)".

It seems a compilation problem. With my other Visual C++ DLLs I had a similar error solved changing the VC++ compilation parameter "Use of MFC" from "Use MFC in a Shared DLL" to "Use MFC in a Static Library"... but I don't know what to do in Matlab.

Anyone successfully used a Matlab dll in a MQL program, any hints?


Thx in advance.

I think someone already did this: http://tinyurl.com/yh3x33c

http://articles.mql4.com/833
http://articles.mql4.com/679
http://articles.mql4.com/440

Thx a lot for these links, tomorrow I will read it. Btw at first sight it seems not possible to establish a "direct" dll to mql interaction like a normal VC++ MFC dll

If true it sucks a lot!

"Exotic" solutions apart, the best way seems to write a C++ DLL wrapper for the Matlab dll. The MQL program invoke the C++ DLL via #import directive and the C++ invoke the Matlab dll including its header file:

MQL <= #import => C++ mlWrapper.dll <= matlabdll.h => matlabDll.dll

Dear Daltanious
did you finally manage to write the wrapper? I am working on it and I prepared some code, everything looks fine until I start using the functions in the DLL generated in MATLAB. I got error 126

Hello everybody.
I'm now also working with MT4 and have some function that I wrote in Matlab. Through the post http://articles.mql4.com/833, I also want to make a DLL-Wrapper via Borland C++ Builder, but I think some file (and step) are missing from the post. Can someone please tell me how to make a DLL file with Borland, and use it in MT4 successfully?
I hope someone have done this before. thankx.