怎么使用回调函数？

时间：2020-02-25 13:53:40 阅读：68 评论：0 收藏：0 [点我收藏+]

3. 怎么使用回调函数？
知道了什么是回调函数，了解了回调函数的特点，那么应该怎么使用回调函数？下面来看一段简单的可以执行的同步回调函数代码。

#include<stdio.h>
int Callback_1() // Callback Function 1
{
printf("Hello, this is Callback_1 \n");
return 0;
}
int Callback_2() // Callback Function 2
{
printf("Hello, this is Callback_2 \n");
return 0;
}
int Callback_3() // Callback Function 3
{
printf("Hello, this is Callback_3 \n");
return 0;
}
int Handle(int (*Callback)())
{
printf("Entering Handle Function.\n ");
Callback();
printf("Leaving Handle Function.\n ");
}
int main()
{
printf("Entering Main Function.\n ");
Handle(Callback_1);
Handle(Callback_2);
Handle(Callback_3);
printf("Leaving Main Function.\n");
return 0;
}

复制代码

运行结果：Entering Main Function.
Entering Handle Function.
Hello, this is Callback_1
Leaving Handle Function.
Entering Handle Function.
Hello, this is Callback_2
Leaving Handle Function.
Entering Handle Function.
Hello, this is Callback_3
Leaving Handle Function.
Leaving Main Function.