DLL Import Error > Desperate!

Hi,

My goal is to create a .dll function from Matlab and Visual C++ 6.0 and import it into MT4. Let me explain what I did, and what results I got.

What I've done:
I made two Matlab functions:

1.
Function output = AddTwo(x,y)
output = x + y;
2.
Function output = MultiplyTwo(x,y)
output = x * y;

Next, I compiled them into a dll using mcc and mbuild compiler Visual C++ 6.0 by using command:

mcc -W cpplib:libmatrix -T link:lib AddTwo MultiplyTwo
(sometimes I've seen another library "libmmfile.mlib" here, but I'm not sure)

Which got me several files, including the .cpp, .h, .dll, .exports, etc. files.

I imported the .dll into a test MT4 EA using a .mqh. In the init() section, I call the two .dll functions as a test.


Results:
When calling AddTwo and MultiplyTwo, I get error 127, which probably means that the function names are mangled or something.

So, I open up the .exports file and see that the functions names are "mlxAddTwo" and "mlxMultiplyTwo". I am not sure so I call these functions in the test EA and the result is a critical error crash of MT4:

I have attached all the necessary files. In my opinion, there is probably a mistake in compiling the .cpp file. In the sample dll EA I have seen these "MT4_EXPFUNC" or something like that. Please, I am pretty desperate here and I would sincerely appreciate if someone took a look at the .cpp and .h files and see how to make them work (dll) in MT4 by changing few things.

I have Microsoft Visual C++ 6.0.

My main goal is to successfully call these two Matlab functions via .dll.

Thank you!

EDIT:
Also, I am not completely familiar with compiling with Visual C++ using .def file. If there is anything I need to do involving .def files, please say.

You have to use a .def file in my experience. I am no expert at this either, but I have managed to make this work.

I first did this a few years ago using microsoft visual c++ 6.0, but I now use the free express version of visual c++ 2008.

The .def file must be linked to your .cpp file and the code is quite simple, looks something like this:

How do I actually link this file? Do I simply add this file to the project or is there a special way?

When using VS C++ 2008, I start with an "empty" project.

Next I add a .cpp and a .def to the project. (in source files)

Under your project name-properties-configuration properties-general you need to set the configuration type to dll.

Then under configuration properties-linker-input you need to add the name of your .def (exactly) in the module definition file field. Ex: MyDll.def

This links your .def to your dll .cpp code.

Hope this helps.