iOS開發筆記 －UDP socket使用AsyncUDPSocket

在iOS上有個好用的library：CocoaAsyncSocket。我想用的是UDP socket，所以選了AsyncUdpSocket。

先建好一個project，將AsyncUdpSocket.h及AsyncUdpSocket.m複製過去。記得加入CFNetwork.framework

這邊有個地方要注意是，AsyncUdpSocket用的是ARC，若專案沒有設定ARC，則要加入編譯條件：

在項目target -> build phases -> compile sources -> AsyncUdpSocket文件後面加入-fobjc-arc，這是為了使編譯器compile-的時候將此文件在arc的條件下編譯。

新增一個要用到的檔案，例如這邊是example

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

#define DEFAULT_UDP_TIMEOUT 10;

@interface example : NSObject<AsyncUdpSocketDelegate> {
 
}

-(IBAction)sendData:(id)sender;

@end

#import "example.h"

@interface example() {
   AsyncUdpSocket * __udpSocket;
}

- (void)initialSocket;

@end

@implementation example

#DEFAULT_UDP_TIMEOUT 3000.0f
#DEFAULT_UDP_TAG 1

- (id)init
{
    self = [super init];
    if (self != nil) {
       Byte *byteArray = (Byte*)malloc(sizeof(Byte)*5);
       NSData *data = [NSData dataWithBytes:byteArray length:5];
       [self initialSocket:data];
    }
    return self;
}

-(IBAction)sendData:(NSData*)data sender:(id)sender
{
    [__udpSocket sendData:data withTimeout:DEFAULT_UDP_TIMEOUT tag:DEFAULT_UDP_TAG]; //TAG要一樣，才能在同個頻道
}


- (void)initialSocket:(NSData*)data {
    //初始化udp packet
    __udpSocket = [[AsyncUdpSocket alloc] initWithDelegate:self];
    
    NSError *error = nil;
    
    if (![__udpSocket isConnected]) {
        
        
        ConfigObject *config = [ConfigObject sharedConfigObject];
        
        NSError *error;
        if( [__udpSocket connectToHost:config.ip onPort:config.port error:&error] ) {
            CCLOG(@"Ready");
            
            //觸發回應
            [self sendData:data sender:nil];
            
        }
        else
            CCLOG(@"Fail: %@",error);
    }
}


//以下是AsyncUdpSocketDelegate的function
#pragma mark udp socket

- (void)onUdpSocket:(AsyncUdpSocket *)sock didSendDataWithTag:(long)tag
{
     NSLog(@"data: %@",);
}

- (void)onUdpSocket:(AsyncUdpSocket *)sock didNotSendDataWithTag:(long)tag dueToError:(NSError *)error
{
// You could add checks here
}

- (BOOL)onUdpSocket:(AsyncUdpSocket *)sock
     didReceiveData:(NSData *)data
            withTag:(long)tag
           fromHost:(NSString *)host
               port:(UInt16)port
{
//    NSString *msg = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
     NSLog(@"msg: %@",data);
     [__udpSocket receiveWithTimeout:DEFAULT_UDP_TIMEOUT tag:DEFAULT_UDP_TAG];
return YES; //這行一定要有，否則就會到此結束
}


@end


要傳資料就可以用sendData即可

參考網址：
IOS And AsyncUDPSocket - Tutorial?
CocoaAsyncSocket
iPhone 發送UDP廣播並接收資料
iOS AsyncUdpSocket使用简介
iPhone的Socket编程使用开源代码之AsyncSocket
详解iPhone 下AsyncSocket网络库编程