VC DLL 动态链接库(四)

// point.h point 类的声明
#ifnedf POINT_H
#define POINT_H
#ifdef DLL_FILE
class _declspec(dllexport) point // 导出类 point
#else
class _declspec(dllimport) point // 导入类 point
#endif
{
public:
    float x, y;
    point();
    point(folat x_coordinate, folat y_coordinate);
};
#endif

// point.cpp point 类的实现
#ifnedf DLL_FILE
#define DLL_FILE
#endif

#include "point.h"
// 类 point 的缺省构造函数
point::point(){
    x = 0.0, y = 0.0;
}

// 类 point 的构造函数
point::point(float x_coordinate, float y_coordinate){
    x = x_coordinate;
    y = y_coordinate;
}

// circle.h circle 类的声明
#ifndef CIRCLE_H
#define CIRCLE_H
#include "point.h"
#idnef DLL_FILE
class _declspec(dllexport)circle // 导出类 circle
#else
class _declspec(dllimport)circle // 导入类 circle
#endif
{
public:
    void SetCentre(const point centrePoint);
    void SetRadius(float r);
    float GetGirth();
    float GetArea();
    circle();
private:
    float radius;
    point centre;
};
#endif;

// circle.cpp, circle类的实现
#ifndef DLL_FILE
#define DLL_FILE
#endif
#include "circle.h"
#define PI 3.1415926
// circle 类的构造函数
circle::circle()
{
    centre = point(0,0);
    radius = 0;
}
// 得到圆的面积
float circle::GetArea()
{
    return PI*radius*radius;
}
// 得到圆的周长
float circle::GetGirth()
{
    return 2*PI*radius;
}
// 设置圆心坐标
void circle::SetCentre(const point centrePoint)
{
    centre = centrePoint;
}
// 设置圆的半径
void circle::SetRadius(float r)
{
    radius = r;
}

// test.cpp 类的引用
#include "..\\circle.h"
#pragma comment(lib, "dllTest.lib");

int main()
{
    circle c;
    point p(2.0, 2.0);
    c.SetCentre(p);
    c.SetRadius(1.0);
    cout << "area:" << c.GetArea() << "girth" << c.GetGirth() << endl;
    return 0;
}