OOPC

OOPC学习1
最近在研究面向对象的方式进行嵌入式编程，发现了《UML+OOPC嵌入式C语言开发精讲》一书，书中提供的思路着实有用，特此作为学习记录；
将C语言封装成类，在开发的过程中直接可以面向对象的思想进行开发，这样结构清晰，易于联合开发与维护，下面将学习到的代码作为简单的分享与说明。
首先宏定义式的封装，如下程序Lwoopc.h:

#ifndef __LOOPC_H__
#define __LOOPC_H__

#include "malloc.h"

#define CLASS(type)\
typedef struct type type;\
struct type

#define CTOR(type)\
void* type##New()\
{\
	struct type *t;\
	t = (struct type*)malloc(sizeof(struct type));

#define CTOR2(type, type2) \
void* type2##New() \
{ \
	struct type *t; \
	t = (struct type *)malloc(sizeof(struct type));

#define END_CTOR	return (void*)t; }

#define FUNCTION_SETTING(f1,f2)	t->f1 = f2;
#define IMPLEMENTS(type)	struct type type
#define INTERFACE(type)		struct type \
	typedef struct type type; \
	struct type

#endif

说明：首先定义CLASS宏定义，其实就是进行结构体定义，如

CLASS（A）
{
     
	int a;
	int b;
	.
	.
	.
};

经过宏替换后为

typedef struct A A;
struct A
{
     
	int a;
	int b;
	.
	.
	.
};

CTOR为构造器的意思，就是C++中的构造函数， CTOR（A）宏替换后如下：

void* ANew()
{
     
	struct A *t;
	t = (struct A*)malloc(sizeof(struct A));
	return （void*t）;
}

下面在VC6上编写运行里程，程序如下：

cx12_lig.h:
#ifndef __LIGHT_H__
#define __LIGHT_H__

#include "Lw_oopc.h"

CLASS(Light)
{
     
	int state;
	void (*init)(void *);
	int (*get_state)(void *);
	void (* set_light)(void *,int flag);
};

#endif
cx12_lig.c:
#include 
#include 
#include "cx12_lig.h"

static void init(void *t)
{
     
	Light *cthis = (Light *)t;
	
	cthis->state = 0;
}

static int get_state(void *t)
{
     
	Light *cthis = (Light *)t;

	return cthis->state;
}

static void set_light(void *t, int flag)
{
     
	Light *cthis = (Light *)t;

	cthis->state = flag;
	if (cthis->state == 0)
		printf("LIGHT_OFF!\n");
	else
		printf("LIGHT_ON!\n");
}

CTOR(Light)
	FUNCTION_SETTING(init, init);
	FUNCTION_SETTING(get_state, get_state);
	FUNCTION_SETTING(set_light, set_light);
END_CTOR
cx12_sw.h:
#ifndef __SWITCH_H__
#define __SWITCH_H__
#include "Lw_oopc.h"
#include "cx12_lig.h"

CLASS(Switch)
{
     
	int state;
	Light *light_obj;
	void (*init)(void*, Light*);
	int (*get_state)(void *);
	void (*set_switch)(void *);
};
#endif 
cx12_sw.c:
#include 
#include 
#include "cx12_sw.h"

static void init(void *t, Light* light)
{
     
	Switch *cthis = (Switch *)t;

	cthis->state = 0;
	cthis->light_obj = light;
}

static int get_state(void * t)
{
     
	Switch *cthis = (Switch *)t;

	return cthis->state;
}

static void set_switch(void *t)
{
     
	Switch *cthis = (Switch*)t;
	int st;
	Light* light;

	cthis->state = !(cthis->state);
	light = cthis->light_obj;
	st = light->get_state(light);
	if (st == 1)
		light->set_light(light, 0);
	else
		light->set_light(light, 1);
}

CTOR(Switch)
	FUNCTION_SETTING(init, init);
	FUNCTION_SETTING(get_state, get_state);
	FUNCTION_SETTING(set_switch, set_switch);
END_CTOR

main.c:
#include "cx12_lig.h"
#include "cx12_sw.h"

int main(void)
{
     
	Light* light = (Light*)LightNew();
	Switch* wall = (Switch*)SwitchNew();
	Switch *door = (Switch*)SwitchNew();

	light->init(light);
	wall->init(wall,light);
	door->init(door,light);

	wall->set_switch(wall);
	door->set_switch(door);
	door->set_switch(door);
	wall->set_switch(wall);
}

运行结果：