iPhone的Socket编程使用开源代码之AsyncSocket(转)

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

来自：http://www.iteye.com/topic/993392

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

我们将AsyncSocket.h和AsyncSocket.m文件添加到我们的项目中，并且导入CFNetwork.framework<系统包>。这样基本准备工作就做好了。

（添加 CFNetwork.framework的位置："/System/Library/Frameworks/CFNetwork.framework，如果没有则

/Developer/Platforms/iphoneOS.platform/Developer/SDKs/iphoneOS4.3.sdk/System/Library/Frameworks文件夹下

iphoneOS4.3.sdk根据你的版本的不同而不同）

下面提供我的应用中的代码以及界面图：

Socketdemoviewcontroller.h代码

//
//  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代码

@synthesize inputMsg, outputMsg;
@synthesize client;

// 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 {
[inputMsg release];
inputMsg = nil;
[outputMsg release];
outputMsg = nil;
self.client = nil;
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

/*
- (IBAction)sendMsg:(id)sender {

NSLog(@"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];
}
*/
- (int) connectServer: (NSString *) hostIP port:(int) hostPort{

NSLog(@"connectServer");

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];
NSLog(@"reconnect:%@",stat);
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{

NSLog(@"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{

NSLog(@" (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，

Java代码

- (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];

Java代码

- (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。

Sendmsg代码

- (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。

这些都是asyncsocket代理的代码

- (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。

其他要说的，明天再完善吧。