iOS Socket第三方开源类库 ----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:@"
"];
    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:@"
"];
    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" "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 .

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。