回调函数的例子

//para_callback.h

#pragma once

 

typedef void (*callback_t)(void *);

extern void repeat_three_times(callback_t, void *);

 

 

//para_callback.cpp

#include "StdAfx.h"

#include "para_callback.h"

 

void repeat_three_times(callback_t f, void *para)

{

f(para);

f(para);

f(para);

}

 

 

//Main.cpp

#include "stdafx.h"

#include "para_callback.h"

#include <Windows.h>

 

void say_hello(void *str)

{

printf("Hello %s/n", (const char *)str);

}

 

void count_numbers(void *num)

{

int i;

for(i=1; i<=(int)num; i++)

printf("%d ", i);

putchar('/n');

}

 

int _tmain(int argc, _TCHAR* argv[])

{

repeat_three_times(say_hello, "Guys");

repeat_three_times(count_numbers, (void *)4);

 

system("pause");

return 0;

}