正在阅读：VC++动态链接库(DLL)编程深入浅出(二)VC++动态链接库(DLL)编程深入浅出(二)

//文件名：point.h，point类的声明

#ifndef 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 y;

float x;

point();

point(float x_coordinate, float y_coordinate);

};

#endif


//文件名：point.cpp，point类的实现

#ifndef 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;

}


//文件名：circle.h，circle类的声明

#ifndef CIRCLE_H

#define CIRCLE_H

#include "point.h"

#ifdef 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 ¢rePoint);

void SetRadius(float r);

float GetGirth();

float GetArea();

circle();

private:

float radius;

point centre;

};

#endif


//文件名：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 ¢rePoint)

{

centre = centrePoint;

}

//设置圆的半径

void circle::SetRadius(float r)

{

radius = r;

}