AsyncSocket

假如你也是一个java程序员，而你又不是很懂Socket。

下面我的这篇文章也许能帮助你一些。

http://xiva.iteye.com/blog/993336

首先我们写好上面文章中的server端。

下面我们可以访问一下下面的地址：

http://code.google.com/p/cocoaasyncsocket/

这是一个开源框架。呵，不知道拿到自己程序中使用是否涉及侵权。

但是这句话“The CocoaAsyncSocket project is in the public domain.”是我有信心使用它们的源码，否则只能自己用c来写了，或者使用CFSocket、CFNetwork等类自己来写了。不过也无妨，应在在使用线程的情况下，我们也是可以实现的。

总之，为了开发的便捷，我使用了AsyncSocket这个类，这样可以异步通信。

建立一个基于视图的应用程序，按照http://code.google.com/p/cocoaasyncsocket/wiki/Reference_AsyncSocket

我们AsyncSocket.h和AsyncSocket.m到我们的项目中，并且导入CFNetwork.framework。这样基本准备工作就做好了。

 

下面提供我的应用中的代码以及界面图：

 

 //
 //  SocketDemoViewController.h
 //  SocketDemo
 //
 //  Created by xiang xiva on 10-7-10.
 //  Copyright 2010 __MyCompanyName__. All rights reserved.
 //

 #import <UIKit/UIKit.h>
 #import "AsyncSocket.h"
 #define SRV_CONNECTED 0
 #define SRV_CONNECT_SUC 1
 #define SRV_CONNECT_FAIL 2
 #define HOST_IP @"192.168.110.1"
 #define HOST_PORT 8080

 @interface SocketDemoViewController : UIViewController {

     UITextField *inputMsg;
     UILabel *outputMsg;
     AsyncSocket *client;
 }

 @property (nonatomic, retain) AsyncSocket *client;
 @property (nonatomic, retain) IBOutlet UITextField *inputMsg;
 @property (nonatomic, retain) IBOutlet UILabel *outputMsg;

 - (int) connectServer: (NSString *) hostIP port:(int) hostPort;
 - (void) showMessage:(NSString *) msg;
 - (IBAction) sendMsg;
 - (IBAction) reConnect;
 - (IBAction) textFieldDoneEditing:(id)sender;
 - (IBAction) backgroundTouch:(id)sender;

 @end

 

 

 

 //
 //  SocketDemoViewController.m
 //  SocketDemo
 //
 //  Created by xiang xiva on 10-7-10.
 //  Copyright 2010 __MyCompanyName__. All rights reserved.
 //

 #import "SocketDemoViewController.h"

 @implementation SocketDemoViewController

 @synthesize inputMsg, outputMsg;
 @synthesize client;
 /*
 // The designated initializer. Override to perform setup that is required before the view is loaded.
 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
     self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
     if (self) {
         // Custom initialization
     }
     return self;
 }
 */

 /*
 // Implement loadView to create a view hierarchy programmatically, without using a nib.
 - (void)loadView {
 }
 */



 // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
 - (void)viewDidLoad {
     //[super viewDidLoad];
     [self connectServer:HOST_IP port:HOST_PORT];
     //监听读取

 }



 // Override to allow orientations other than the default portrait orientation.
 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
     return YES;
 }

 - (void)didReceiveMemoryWarning {
     // Releases the view if it doesn't have a superview.
     [super didReceiveMemoryWarning];

     // Release any cached data, images, etc that aren't in use.
 }

 - (void)viewDidUnload {
     self.client = nil;
     // Release any retained subviews of the main view.
     // e.g. self.myOutlet = nil;
 }

 - (int) connectServer: (NSString *) hostIP port:(int) hostPort{

     if (client == nil) {
         client = [[AsyncSocket alloc] initWithDelegate:self];
         NSError *err = nil;
         //192.168.110.128
         if (![client connectToHost:hostIP onPort:hostPort error:&err]) {
             NSLog(@"%@ %@", [err code], [err localizedDescription]);

             UIAlertView *alert = [[UIAlertView alloc] initWithTitle:[@"Connection failed to host "
                                             stringByAppendingString:hostIP]
                                                             message:[[[NSString alloc]initWithFormat:@"%@",[err code]] stringByAppendingString:[err localizedDescription]]
                                                            delegate:self
                                                   cancelButtonTitle:@"OK"
                                                   otherButtonTitles:nil];
             [alert show];
             [alert release];
             //client = nil;
             return SRV_CONNECT_FAIL;
         } else {
             NSLog(@"Conectou!");
             return SRV_CONNECT_SUC;
         }
     }
     else {
         [client readDataWithTimeout:-1 tag:0];
         return SRV_CONNECTED;
     }

 }

 - (IBAction) reConnect{
     int stat = [self connectServer:HOST_IP port:HOST_PORT];
     switch (stat) {
         case SRV_CONNECT_SUC:
             [self showMessage:@"connect success"];
             break;
         case SRV_CONNECTED:
             [self showMessage:@"It's connected,don't agian"];
             break;
         default:
             break;
     }
 }

 - (IBAction) sendMsg{

     NSString *inputMsgStr = self.inputMsg.text;
     NSString * content = [inputMsgStr stringByAppendingString:@"\r\n"];
     NSLog(@"%a",content);
     NSData *data = [content dataUsingEncoding:NSISOLatin1StringEncoding];
     [client writeData:data withTimeout:-1 tag:0];

     //[data release];
     //[content release];
     //[inputMsgStr release];
     //继续监听读取
     //[client readDataWithTimeout:-1 tag:0];
 }

 #pragma mark -
 #pragma mark close Keyboard
 - (IBAction) textFieldDoneEditing:(id)sender{
     [sender resignFirstResponder];
 }

 - (IBAction) backgroundTouch:(id)sender{
     [inputMsg resignFirstResponder];
 }

 #pragma mark socket uitl

 - (void) showMessage:(NSString *) msg{
     UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"Alert!"
                                                     message:msg
                                                    delegate:nil
                                           cancelButtonTitle:@"OK"
                                           otherButtonTitles:nil];
     [alert show];
     [alert release];
 }


 #pragma mark socket delegate

 - (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port{
     [client readDataWithTimeout:-1 tag:0];
 }

 - (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err
 {
     NSLog(@"Error");
 }

 - (void)onSocketDidDisconnect:(AsyncSocket *)sock
 {
     NSString *msg = @"Sorry this connect is failure";
     [self showMessage:msg];
     [msg release];
     client = nil;
 }

 - (void)onSocketDidSecure:(AsyncSocket *)sock{

 }

 - (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{

     NSString* aStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
     NSLog(@"Hava received datas is :%@",aStr);
     self.outputMsg.text = aStr;
     [aStr release];
     [client readDataWithTimeout:-1 tag:0];
 }

 #pragma mark dealloc

 - (void)dealloc {

     [client release];
     [inputMsg release];
     [outputMsg release];
     [super dealloc];
 }

 @end

 

 

 

还是先给出我的界面吧，否则很难懂这些代码

 

 

这样大家满意了吧！

好了说了这么多我们还是来看看代码究竟怎么回事吧。

首先从头文件开始看吧，

1，导入头文件#import "AsyncSocket.h"，然后是一些宏

2，声明一个AsyncSocket对象，其他就是一些IBoutlet

再次我们看看视图加载，

 

 - (void)viewDidLoad {
     //[super viewDidLoad];
     [self connectServer:HOST_IP port:HOST_PORT];
     //监听读取

 }

 显然我们调用了connectServer::这个方法。

在这个方法中，首先初始化我们的对象，使用代理的方式。对象显示是self。然后我们便需在我们的类中实现它的各种方法，来得到各种我们想得到的。

client = [[AsyncSocket alloc] initWithDelegate:self];

下面就是连接服务器了，

[client connectToHost:hostIP onPort:hostPort error:&err]

并且当client不为空时，我们就读取服务器的信息

[client readDataWithTimeout:-1 tag:0];

 

 - (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{

     NSString* aStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
     NSLog(@"Hava received datas is :%@",aStr);
     self.outputMsg.text = aStr;
     [aStr release];
     [client readDataWithTimeout:-1 tag:0];
 }

 

 

在这个方法中很耐人寻味，主要就是在于递归的调用。

 

 - (IBAction) sendMsg{

     NSString *inputMsgStr = self.inputMsg.text;
     NSString * content = [inputMsgStr stringByAppendingString:@"\r\n"];
     NSLog(@"%a",content);
     NSData *data = [content dataUsingEncoding:NSISOLatin1StringEncoding];
     [client writeData:data withTimeout:-1 tag:0];
 }

 我们在看看上面发送消息的代码，中的在于"\r\n"的拼接，否则在java端的程序，无法知道你发过来的信息是否结束，当然你也可以使用其他的方式来读取客户端，比如定时；但是我在java端写的server是readLine来判断的，所以需要拼接这个\r\n.

 

其他的代码除了asyncSocket代理外都是我们所熟悉的。

 - (void)onSocket:(AsyncSocket *)sock didConnectToHost:(NSString *)host port:(UInt16)port{
     [client readDataWithTimeout:-1 tag:0];
 }

 - (void)onSocket:(AsyncSocket *)sock willDisconnectWithError:(NSError *)err
 {
     NSLog(@"Error");
 }

 - (void)onSocketDidDisconnect:(AsyncSocket *)sock
 {
     NSString *msg = @"Sorry this connect is failure";
     [self showMessage:msg];
     [msg release];
     client = nil;
 }

 - (void)onSocketDidSecure:(AsyncSocket *)sock{

 }

 - (void)onSocket:(AsyncSocket *)sock didReadData:(NSData *)data withTag:(long)tag{

     NSString* aStr = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
     NSLog(@"Hava received datas is :%@",aStr);
     self.outputMsg.text = aStr;
     [aStr release];
     [client readDataWithTimeout:-1 tag:0];
 }

 

到此就结束了。