#import function used for classes - is it possible?

[[Deleted]]

Dear Forum members,

I've worked on some programs in MQL4 for a year and now I decided to code some Library files as well.
I have some classes written in Include (.mqh) files and used already. They are working properly.

I wrote some functions in a Library file, compiled, and working so now I understand how it's usable. But I don't know, and haven't found any articles/instructions on writing classes in Library (.ex4) files. I tried to put the "export" command after/before the class declaration like if it was a simple function but it doesn't want to work.
Is it possible anyhow? Have anyone written classes in Library files and used like in an Include file? 

Thank you,
TommyRuzich

[ThreadHandle]

You have to use the #import command and specify which functions you want to use, also MQL requires the definition and use of #define MT4_EXPFUNC __declspec(dllexport) within your library.

I can't help much beyond that as i tried building my library in Visual Studio and ended up with loads of Visual Studio junk.

Do you mean a cpp library file? or an ex4 file? To include class file you have to put them in the "Include" sub directory and you can #include <asusual.mqh> they're not executable though.

Regards.

[[Deleted]]

Hi Keelan,

Thanks for answer. I meant building an ex4 library.
It's working when I declare separate functions like this:

int MyCalculator(int value,int value2) export {

    return(value+value2);

}

 But I can't declare a class like this: 

class FirstClass export

{

public:bool Function1(int input1);

private: int Number;

};

 Neither like this:

class FirstClass {

public: bool Function1(int input1) export;

private: int Number;

}; 

bool FirstClass::Function1(int input1) export {

Number=input1; return(true);

}

 It gives: 'export' - method cannot be exported error. It's not .dll, only a simple MQL4 library file (.ex4). I tried to put "export" to several places but it gives 'export' - unexpected token error. The .mq4 file is attached.

Thanks.
TR 

[Ex Ovo Omnia]

You cannot move entire class into a library, the class must be implemented during compile time. But you may code part of its implementation into a library, using inheritance.

Promote Your Development Projects Using EX5 Libraries 

The pattern is for mql5, but works for MQL4 as well. 

[[Deleted]]

Ovo,

Thank you very much, this is what I've been looking for. You have the solution. :)

TR