iOS -Socket 开发基础(UDP)

iOS -Socket 开发基础(UDP)_第1张图片
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前言

什么是UDP协议广播机制?

举一个例, 例如在一群人群中,一个人要找张三,于是你向人群里大喊一声(广播):“谁是张三”

如果它是张三,它就会回应你,在网络中也是一样的。

UDP广播机制的应用场景:

若干个客户端,在局域网内(不知道IP的情况下) 需要在很多设备里需找特有的设备,比如服务器,抑或是某个打印机,传真机等。

假设我现在准备将服务器装在永不断电的iPhone上。

若干个客户端iPhone 一激活,就要来向所有设备广播,谁是服务器,是服务器的话,请把IP地址告诉我。然后我就去连接,然后进入长连接,后台接受消息。

客服端发送集成:


#import "ViewController.h"
#import "AsyncUdpSocket.h"

#define PORT 5555
@interface ViewController ()
{
    
    /** 发送*/
    AsyncUdpSocket *_sendSocket;
 
}
@property (weak, nonatomic) IBOutlet UITextField *IPField;
@property (weak, nonatomic) IBOutlet UITextField *sendField;


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

     
}

- (IBAction)sendMSG:(id)sender {
    
    _sendSocket = [[AsyncUdpSocket alloc] initWithDelegate:self];
    [_sendSocket bindToPort:PORT error:nil];
    

    NSData *data = [self.sendField.text dataUsingEncoding:NSUTF8StringEncoding];
    
    
    BOOL res =  [_sendSocket sendData:data toHost:self.IPField.text port:PORT withTimeout:30 tag:0];
    
    if (!res) {
        
      
        TTAlertNoTitle(@"发送失败");

    }
    

}

#pragma mark -
#pragma mark UDP Delegate Methods
 //无法发送时,返回的异常提示信息
- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error
{
   
    TTAlertNoTitle([error description]);

    
}



void TTAlertNoTitle(NSString* message) {
    UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                    message:message
                                                   delegate:nil
                                          cancelButtonTitle:@"取消"
                                          otherButtonTitles:nil];
    [alert show];
}

服务器接收集成:


#import "ViewController.h"
#import "AsyncUdpSocket.h"
#define PORT 5555
@interface ViewController ()
{
    /** 接收*/
    AsyncUdpSocket *_recvSocket;

}
@property (weak, nonatomic) IBOutlet UITextView *MSGView;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    _recvSocket = [[AsyncUdpSocket alloc] initWithDelegate:self];
    [_recvSocket bindToPort:PORT error:nil];
    [_recvSocket receiveWithTimeout:-1 tag:0];
    

}
#pragma mark -
#pragma mark UDP Delegate Methods
- (BOOL)onUdpSocket:(AsyncUdpSocket *)sock didReceiveData:(NSData *)data withTag:(long)tag fromHost:(NSString *)host port:(UInt16)port
{   
    
    
    NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    
    self.MSGView.text = str;
    NSLog(@"host---->%@ port--%i str----%@",host,port,str);
    
    return YES;
}
//无法接收时,返回异常提示信息
- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotReceiveDataWithTag:(long)tag dueToError:(NSError *)error
{   
    
    TTAlertNoTitle([error description]);
    
}



void TTAlertNoTitle(NSString* message) {
    UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"提示"
                                                    message:message
                                                   delegate:nil
                                          cancelButtonTitle:@"取消"
                                          otherButtonTitles:nil];
    [alert show];
}

Demo中所用的第三方框架 AsyncUdpSocket


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