c语言建立和调用dll

int __declspec(dllexport)add(int,int);//入口函数加 __declspec(dllexport)

#include "add.h"

int __declspec(dllexport)add(int x,int y){
return x+y;
}

#include<stdio.h>
#include<Windows.h>
#include "add.h"

typedef int (*PF)(int,int);

int main(){
HINSTANCE hDll; //DLL句柄
PF pf;
int ret;

hDll = LoadLibrary(L"D://add.dll"); //加载 dll
if(hDll){
pf = (PF)GetProcAddress(hDll,"add");//通过指针获取函数方法
r = pf(1,1);
printf("%d\n",r);
}
return 0;
}