//testLib.cpp文件
#include"testLib.h"

double calcdang::plusdang(double a, double b) { return a + b; }
double calcdang::multdang(double a, double b) { return a * b; }
double calcdang::subdang(double a, double b) { return a - b; }

//testLib.h文件
#pragma once
class calcdang {
public:
	double plusdang(double a, double b);
	double multdang(double a, double b);
	double subdang(double a, double b);
};

//.ctypesdll.cpp文件
//extern "C" C++中编译c格式的函数,如果利用c语言编译不需要
//__declspec(dllexport)  导出到库中(win系统环境下.dll文件链接宏)
#include <stdio.h>
#include "testLib.h"       //.lib文件的头文件
#include <iostream>

using namespace std;

extern "C" __declspec(dllexport) void TestCtypes() 
{
	printf("In C testCtypes\n");	

    //调用.lib文件中的函数
	calcdang datatest1;
	cout.flags(ios::fixed);
	cout.precision(2);//设置输出精度
	cout << "2.11*6.22 = " << datatest1.multdang(2.11, 6.22) << endl;
	cout << "2.11-6.22 = " << datatest1.subdang(2.11, 6.22) << endl;
	cout << "2.11+6.22 = " << datatest1.plusdang(2.11, 6.22) << endl;

	system("pause");
}