Blog – Page 13 – Robin's 绝对领域

bluetooth

BT578 BLE AT指令

AT +OK

AT+VERSION 版本信息

AT+NAME 查看蓝牙socket名字

AT+NAMEROBIN 设置蓝牙socket名字为ROBIN

AT+NAMB 查看低功耗蓝牙名字

AT+NAMBROBIN 设置低功耗蓝牙名字为ROBIN

Tags BT578

objective-c

ios macos 系统架构

Tags IOS, Macos

objective-c

NSObject 类编程

Saler.h //头文件声明声明对外公开的方法声明公共属性和私有属性

@interface Saler : NSObject {
    @private NSThread *thread;
}
@property NSNumber *ticket;
-(void) startSale;
@end

Saler.m //声明具体方法实现 init为默认的构造函数

#import "Saler.h"

@implementation Saler

-(Saler*) init{
    self = [super init];
    NSLog(@"init saler");
    self.ticket = [NSNumber numberWithInt:20];
    //公共属性用.访问
    return self;
}

-(void) startSale{
    NSThread *thread = [NSThread new];
    self->thread = thread;
    //私有属性用->访问
    [thread initWithTarget:self selector:@selector(run) object:nil];
    [thread start];
}

-(void) run{
    NSLog(@"running");
}

@end

objective-c

objective-c socket 编程

NSNetService //socket server

NSPort

子类有NSSocketPort(ip地址 + 端口) //socket client

子类有NSMachPort(应用消息通讯) 多线程通过此端口应用通讯

子类有NSMessagePort (NSMachPort对消息的封装)

但是 objective-c 有

NSConnection

NSURL

用来处理http请求 file请求 ftp请求都是一些比较上层的应用层协议

NSURL *url = [NSURL URLWithString:@"https://www.baidu.com"];
        
        //2、创建请求(Request)对象(默认为GET请求)；
        NSURLRequest *requst = [[NSURLRequest alloc]initWithURL:url];
        
        //3、发送请求
        /*
         第一个参数:请求对象
         第二个参数:响应头
         第三个参数:错误信息
         返回值:NSData类型,响应体信息
         */
        NSError *error = nil;
        NSURLResponse *response = nil;
        //发送同步请求(sendSynchronousRequest)
        NSData *data = [NSURLConnection sendSynchronousRequest:requst returningResponse:&response error:&error];
        
        NSLog(@"connection data:%@",[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding]);
        NSLog(@"connection error:%@",error);

macos

macos 连接ipad 不停闪退

sudo killall -STOP -c usbd

命令执行后可以正常连接

objective-c

objective-c 流编程

文件输入流

NSMutableData *data = [NSMutableData new];
        NSInputStream *inputStream = [NSInputStream inputStreamWithFileAtPath:@"/Users/dengfang/111.txt"];
        [inputStream open];
         NSLog(@"数据读取中...");
        while(1){
            uint8_t buf[1024];
            NSInteger readLength = [inputStream read:buf maxLength:1024];
            if (readLength > 0) {
                [data appendBytes:buf length:readLength];
            } else {
                NSLog(@"未读取到数据");
                break;
            }
        }
        NSLog(@"%@" ,[data base64EncodedStringWithOptions:nil]);
    }

文件输出流

NSOutputStream *ouputStream = [NSOutputStream outputStreamToFileAtPath:@"/Users/dengfang/222.txt" append:false];
[ouputStream open];
[ouputStream write:data.bytes maxLength:data.length];
[ouputStream close];

objective-c

objective-c 多线程

NSThread 为objective-c 的多线程对象


#import "Saler.h"

@implementation Saler

-(Saler*) init{
    self = [super init];
    NSLog(@"init saler");
    self.ticket = [NSNumber numberWithInt:20];
    return self;
}

-(void) startSale{
    NSThread *thread = [NSThread new];
    self->thread = thread;
    [thread initWithTarget:self selector:@selector(run) object:nil];
//该访问指明调用self.run 方法作为线程运行代码 
    [thread start];
}

-(void) run{
    NSLog(@"running");
}

@end

main 函数

#import <Foundation/Foundation.h>
#import "Saler.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        Saler* saler1 = [Saler new];
        Saler* saler2 = [Saler new];
        [saler1 startSale];
        [saler2 startSale];
        NSLog(@"starting");
    }
    
   
    
    return 0;
}

console output

2023-04-02 20:58:33.568419+0800 CMD[2079:186178] init saler
2023-04-02 20:58:33.568662+0800 CMD[2079:186178] init saler
2023-04-02 20:58:33.569828+0800 CMD[2079:186178] starting
2023-04-02 20:58:33.570763+0800 CMD[2079:186233] running
2023-04-02 20:58:33.570776+0800 CMD[2079:186234] running
Program ended with exit code: 0

objective-c

objective-c 日期

NSDate

NSDate *date = [NSDate new];  //默认为当前日期
//NSDate *date = [NSDate date];  //调用date方法也可以
NSLog(@"print date is %@",date);

dateFormat 格式化输出

   NSDateFormatter *formatter = [NSDateFormatter new];
        
   formatter.dateFormat = @"yyyy-MM-dd HH:mm:ss z";
        
   //[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss z"];
   
   NSString *str = [formatter stringFromDate:date];
        
   NSLog(@"print date is %@",str);

dateFormat 反格式化

NSString *dateString = @"2023-04-02 11:33:04";
        
NSDateFormatter *formatter = [NSDateFormatter new];
        
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        
NSDate *date = [formatter dateFromString:dateString];
        
NSLog(@"print date is %@",date);

objective-c