win32编程 -- 动态库中声明类

#ifndef __CLASSDLL_H
#define __CLASSDLL_H
#ifdef DLLCLASS_EXPORTS
#define EXT_CLASS _declspec(dllexport)
#else
#define EXT_CLASS _declspec(dllimport)
#endif
class EXT_CLASS yunsuan
{
public:
       int add(int a, int b);
       int sub(int a, int b);
};
#endif

#define DLLCLASS_EXPORTS
#include "dll类.h"
int yunsuan::add(int a, int b) {
       return a + b;
}
int yunsuan::sub(int a, int b) {
       return a - b;
}

#include <stdio.h>
#include "../动态库添加类/dll类.h"
#pragma comment(lib,"../Debug/动态库添加类.lib")
int main() {
       yunsuan ys;
       int a = ys.add(1, 2);
       int b = ys.sub(2, 1);
       printf("和：%d,差：%d", a, b);       return 0;
}