VC++ dll 创建，使用def文件，动态加载

1.创建动态库

dlltest2.cpp

int __stdcall Add(int a, int b)
{
	return a + b;
}
int __stdcall Sub(int a, int b)
{
	return a - b;
}

dlltest2.def

LIBRARY dlltest2.dll

EXPORTS
Add @ 1
Sub @ 2

2.动态加载动态库

#include "stdafx.h"
#include <windows.h>
typedef int(__stdcall * func)(int a, int b);

int main()
{
	func fun1, fun2;
	HINSTANCE hdll = LoadLibraryA("dlltest2.dll");
	if (hdll == NULL)
		FreeLibrary(hdll);
	fun1 = (func)GetProcAddress(hdll, "Add");
	fun2 = (func)GetProcAddress(hdll, (char*)(2));
	int sum, sub;
	if(fun1 != NULL)
		sum = fun1(2, 3);
	if(fun2 !=NULL)
		sub = fun2(2, 3);
	FreeLibrary(hdll);
    return 0;
}