【结构体、结构体指针和函数指针（韦东山C语言加强07）】

#结构体、结构体指针和函数指针（韦东山C语言加强07）

1 结构体2 函数指针在结构体中的妙用3 EEPROM 与结构体指针的妙用

//结构体及结构体指针
typedef struct student {
	char *name;	
	int age;
	struct student *   classmate;
}student, * pstudent; 



int main( void )
{
	student zhangsan = {"zhangshan", 10, NULL};
	student lili = {"lili", 10, NULL};
	
	zhangsan.classmate = &lili;
	lili.classmate = &zhangsan;
	
	prvSetupHardware();
	
	printf("zhangsan's classmate is :%srn", zhangsan.classmate->name);

	while (1);
	
	return 0;
}

typedef struct student {
	char *name;	
	int age;
	void (*good_work)(void); //函数指针
	struct student *   classmate;
}student, * pstudent; 



static void play_ball(void)
{
	printf("playing ballrn");
}

static void sing_song(void)
{
	printf("singingrn");
}
int main( void )
{
	int i;
	student ss[2] = {{"zhangshan", 10, play_ball, NULL}, {"lili", 10, sing_song, NULL}};
	
	prvSetupHardware();

	for (i = 0; i < 2; i++)
	{
		ss[i].good_work();
	}

	while (1);
	
	return 0;
}

//---------------------------------------------------初级版-----------------------------------
#if 0
int main( void )
{
	int i;
	student ss[5] = {{"zhangshan", 10, NULL}, {"lili", 10, NULL}};
	
	prvSetupHardware();

	for (i = 0; i < 2; i++)
	{
		if (strcmp(ss[i].name, "zhangshan") == 0)
			play_ball();
		else if (strcmp(ss[i].name, "lili") == 0)
			sing_song();
	}

	while (1);
	
	return 0;
}
#endif

//通过eeprom读取lcd类型，执行相应操作
int read_eeprom()
{
	
	return 0; 
}

int get_lcd_type(void)
{
	return read_eeprom();
}

void draw_logo_lcda(void)
{
	printf("display logo on lcd arn");
}

void draw_logo_lcdb(void)
{
	printf("display logo on lcd brn");
}


struct lcd_ops {
	int type;
	void (*draw_logo)(void);
	void (*draw_text)(char *str);
};

struct lcd_ops ask100_lcds[] ={
	{0, draw_logo_lcda, NULL},
	{1, draw_logo_lcdb, NULL},
	{2, draw_logo_lcdc, NULL},
	{3, draw_logo_lcdd, NULL},
};



int main( void )
{
	int type = get_lcd_type();
	ask100_lcds[type ].draw_logo();
	prvSetupHardware();
	while (1);
	return 0;
}
//--------------------进阶——----减少全局变量的使用,如果使用，用函数封装起来-------------------

int read_eeprom()
{
	
	return 0; 
}

int get_lcd_type(void)
{
	return read_eeprom();
}

void draw_logo_lcda(void)
{
	printf("display logo on lcd arn");
}

void draw_logo_lcdb(void)
{
	printf("display logo on lcd brn");
}

typedef struct lcd_operation {
	int type;
	void (*draw_logo)(void)
}lcd_operation, *p_lcd_operation;


lcd_operation xxx_com_lcds[] = {
	{0, draw_logo_lcda},
	{1, draw_logo_lcdb},
	{2, draw_logo_lcdc},
	{3, draw_logo_lcdd},
};
//结构体指针
p_lcd_operation get_lcd(void)
{
	int type = get_lcd_type();
	return &xxx_com_lcds[type];
}

int main( void )
{
	p_lcd_operation lcd;
	
	lcd = get_lcd();//获取lcd
	lcd->draw_logo();
	prvSetupHardware();

	

	while (1);
	
	return 0;
}