iPhone的Socket编程使用开源代码之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。
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下面提供我的应用中的代码以及界面图：
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//// 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??
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//// 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;//192.168.110.128if (![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?
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还是先给出我的界面吧，否则很难懂这些代码
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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，
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- (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];
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- (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。
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- (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.
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其他的代码除了asyncSocket代理外都是我们所熟悉的。
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- (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。
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其他要说的，明天再完善吧。
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1 楼 passionke 2011-04-12 我表示，我是被楼上的头像感动的，