🚀 go-pugleaf

Hi all

I'm developing a DLL with class in it.

but there are many questions when using C++ Object int the DLL
i.e.
1. vritual function can't be invoked in the inherit class
2. data member can't be accessed
the following is a simple sample

// class in DLL
//-------------------------------------
class Object;

class A
{
public:
    virtual void Refresh() = 0;
protected:
    std::vector<Object> ObjList;
};

class B : public A
{
public:
    virtual void Refresh();
protected:
    virtual void Set();

    int m_nIndex;
    int m_nNumObject;
};

void B::Set()
{
    m_nIndex = 0;
    m_nNumObject = 0;
    // ...
}

void B::Refresh()
{
    Set();
    // ...
}

//
A *g_pB = NULL;
// DLLMAIN
case PROCESS_ATTACH:
    if(!g_pB) g_pB = static_cast<B*>(new B());

// DLL export function:
extern "C" MYDLL_API void GetObjectB(B** pB)
{
    *pB = g_pB;
}
//----------------------------------------------
there is a error when i invoke the Refresh() via
g_pB Pointer out of the DLL

the error occured when the Set() will be invoking
but if i remove the virtual keyword for Set()
it can be invoking successfully
but the error appears again when the Set() running
the error occered in line: m_nIndex = 0; when
I trace the Set() function
that is to say,
I can't access the data member of the class that
inherited from an abstract class.

Any hint will be great appreciated.

sky