#include <Windows.h>

 _declspec(dllexport) void message_hello()

 {

     MessageBoxA(, "hello", "hello", );

 }

 _declspec(dllexport) double add(double num1, double num2)

 {

     return num1 + num2;

 }

#include <stdlib.h>

#include <Windows.h>

void main()

{

    HMODULE mod = LoadLibraryA("工具.dll");

    if (mod == NULL)

    {

        printf("load error\n");

        exit();

    }

    //获取函数地址

    void(*message_hello)() = (void(*)())GetProcAddress(mod, "message_hello");

    double(*add)(double, double) = (double(*)(double, double))GetProcAddress(mod, "add");

    //调用函数

    if (message_hello == NULL)

    {

        printf("find error\n");

    }

    else

    {

        message_hello();

    }

    if (add == NULL)

    {

        printf("find error\n");

    }

    else

    {

        printf("%f",add(,));

    }

    system("pause");

}