C函数的DLL，C++动态调用。

#ifndef __CDLL_H__
#define __CDLL_H__
extern int _declspec(dllexport) foo(int x, int y);
#endif

#include "CDLL.h"
int foo(int x, int y)
{
return x + y;
}

#include "DLLDemo.h"
#include<iostream>
#include<Windows.h>

using namespace std;

typedef int(*lp)(int, int);

int main()
{
HINSTANCE hdll;
lp func;
hdll = LoadLibrary("CDLL.dll"); //或者：hdll = LoadLibrary("../Debug/CDLL.dll"); 要保证相对路径正确
if (hdll != NULL)
{
func = (lp)GetProcAddress(hdll, "foo");
cout << func(2, 3) << endl;
}
FreeLibrary(hdll);

return 0;
}