C++接口库调用方法(QT)

#ifndef ICONNECT_H
#define ICONNECT_H

#include <QtCore/qglobal.h>
#if defined(MYDLL_LIBRARY)
#  define MYDLL_EXPORT Q_DECL_EXPORT
#else
#  define MYDLL_EXPORT Q_DECL_IMPORT
#endif

 

///接口类
class IConnect
{
public:
    virtual ~IConnect(){}
    //static IConnect* createEx();
    virtual int sum(int a, int b) = 0;
    virtual int sub(int a, int b) = 0;
};

extern "C" MYDLL_EXPORT IConnect* Create();

 

#endif //ICONNECT_H

 

#include "../Interface/IConnect.h"

 

//MyDll继承接口类IConnect

class MyDll : public IConnect
{
public:
    MyDll();
    int sum(int a, int b) override;
    int sub(int a, int b) override;
};

 

//实现类

#include "mydll.h"

 

MyDll::MyDll()
{
}

int MyDll::sum(int a, int b)
{
    return  a + b;
}

int MyDll::sub(int a, int b)
{
    return  a - b;
}

///注意
extern "C" MYDLL_EXPORT IConnect* Create()
{
    return new MyDll();
}

 

///将MyDll的lib和dll文件加载库后 调用

IConnect* connect = Create();

cout<<connect->sum(3, 5)<<endl;

 

可以继续封装