c++ 调用dll

#pragma once

#ifndef MYDLL_API_EXPORTS  
#define MYDLL_API __declspec(dllexport)  
#else  
#define MYDLL_API __declspec(dllimport)  
#endif  
extern "C" MYDLL_API void sayHello();

// HelloDll.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "HelloDll.h"
#include "iostream"

MYDLL_API void sayHello()
{
    std::cout << "hello world";
}

// ConsoleApplication1.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<Windows.h>  
#include "iostream"
typedef void(*funcptr)();
int main()
{
    using namespace std;
    const char* dllName = "HelloDll.dll";
    const char* funcName = "sayHello";
    HMODULE hDLL = LoadLibrary(_T(dllName));
    if (hDLL != NULL)
    {
        funcptr func = (funcptr)GetProcAddress(hDLL, funcName);
        if (func != NULL)
        {
            (*func)();
        }
        else
        {
            std::cout << "Cannot Find Function " << funcName << std::endl;
        }
    }
    else
    {
        std::cout << "Cannot Find " << dllName << std::endl;
    }
    getchar();
    return 0;
}