how can i export a function of a class?

[David Crow]

See here.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

[Mark Salsbery]

I prefer something like this, using __declspec(dllexport)/__declspec(dllimport)... In a header file shared by both the DLL and other modules:

// MyClass.h

#if defined(BUILDING_MY_DLL)
#define MY_DLL_IMP_EXP __declspec(dllexport)
#else
#define MY_DLL_IMP_EXP __declspec(dllimport)
#endif

class MyClass
{
public:
MY_DLL_IMP_EXP int SomeFunc();
};

In the DLL code:

#include "MyClass.h"

int MyClass::SomeFunc()
{
return 12;
}

In the module importing the function

#include "MyClass.h"

MyClass mc;
int ret = mc.SomeFunc();

Add a define compiler option for BUILDING_MY_DLL (/D "BUILDING_MY_DLL") on the DLL project settings, but not on any projects that use the DLL. Mark

Mark Salsbery Microsoft MVP - Visual C++ :java:

[Mark Salsbery]

Broken link alert :)

Mark Salsbery Microsoft MVP - Visual C++ :java:

[alphaxz]

thanks all i got the method I use the class in a global function then i deifne the global function as export function

a beginner

[Mark Salsbery]

alphaxz wrote:

I use the class in a global function then i deifne the global function as export function

If that's what you want. That's not the same as exporting a function of a class. That's like using C++ without classes - C. :) Mark

Mark Salsbery Microsoft MVP - Visual C++ :java:

[CPallini]

WOW, C++ classes encapsulation with C global functions. Is that the C-nemesis pattern? :rolleyes:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke

[David Crow]

Are you sure? It should go to James' post below.

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

[Mark Salsbery]

I must have scrolled down too soon, before the post opened - sorry :)

Mark Salsbery Microsoft MVP - Visual C++ :java:

[Mark Salsbery]

We're not supposed to mention the C-nemesis pattern, are we? :)

Mark Salsbery Microsoft MVP - Visual C++ :java:

[CPallini]

It depends on the mood of the day. :-D

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong. -- Iain Clarke