Embedded & amp; iOS: Comparison of callback function (C) and block (OC) parameters/functions, embedded training

Embedded & iOS: Comparison of callback function (C) and block (OC) parameters/functions, embedded training

C callback function:

CallBack. h

1) declare a doSomeThingCount function. The parameter is a (no return value, 1 int parameter) function.

void DSTCount(void(*CallBack)(int data_i32));

 

CallBack. c

1) In the doSomeThingCount function, increase the number of running times and call the parameter -- function.

void DSTCount(void(*CallBack)(int data_i32)){    static int numb = 0;    numb++;    (*CallBack)(numb);}

　

Main. c

1) define a customdoSomeThingCount function to print data.

void customDSTCount(int data_i32){    printf("%d\n",data_i32);}

2) in the main function, run the DSTCount function of callBack. h. The parameter is the customDSTCount function in main.

while (1){    DSTCount(customDSTCount);}

 

 

 

OC Block:

MyButton. h (inherited from UIButton ):

1) define the number and type of parameters of a Block.

typedef void(^ButtonBlock)(int data_i32);

2) declare a doSomeThingCount function with Block parameters. (Note: you do not need to add * here. The class is used to adding a parameter * at will *)

-(void)DSTCount:(ButtonBlock)myButtonBlockPTR;

 

MyButton. m (inherited from UIButton ):

1) In the doSomeThingCount function, increase the number of running times and call the Block parameter.

-(void)DSTCount:(ButtonBlock)myButtonBlockPTR{    static int numb = 0;    numb++;    myButtonBlockPTR(numb);}

　

RootViewControl. m (self. window. rootViewController ):

1) The viewDidLoad function defines a (100,100,100,100), red button instance, button to add events, and button to self. view.

MyButton *tempButton = [[MyButton alloc]initWithFrame:CGRectMake(100, 100, 100, 100)];    tempButton.backgroundColor = [UIColor redColor];    [tempButton addTarget:self action:@selector(mybuttonClick:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:tempButton];

2) click the button to call the DSTCount function in MyButton. The Block parameter is directly input.

-(void)mybuttonClick:(MyButton*)button{    [button DSTCount:^(int data_i32) {        printf("%d\n",data_i32);    }];}

 

 

 

 

 

 

Image supplement:

C callback function:

1) CallBack. C

2) CallBack. h

3). main. c

 

 

 

OC Block

1) MyButton. h

2) MyButton. m

3) RootViewControl. m

4) Run