实例:2：使用NSOperation和NSOperationQueue启动多线程
在app store中的很多应用程序非常的笨重，他们有好的界面，但操作性很差，比如说当程序从网上或本地载入数据的时候，界面被冻结了，用户只能等程序完全载入数据之后才能进行操作。
当打开一个应用程序时，iphone会产生一个包含main方法的线程，所用程序中的界面都是运行在这个线程之中的（table views, tab bars, alerts…）,有时候我们会用数据填充这些view，现在问 题是如何有效的载入数据，并且用户还能自如的操作程序。方法是启动新的线程，专门用于数据的下载，而主线程不会因为下载数据被阻塞。
不管使用任何编程语言，在实现多线程时都是一件很麻烦的事情。更糟糕的是，一旦出错，这种错误通常相当糟糕。然而，幸运的是apple从os x10.5在这方面做了很多的改进，NSThread的引入，使得开发多线程应用程序容易多了。除此之外，它们还引入了两个全新的类，NSOperation和NSOperationQueue。
接下来我们通过一个实例来剖析如何使用这两个类实现多线程。这里指示展示这两个类的基本用法，当然这不是使用他们的唯一办法。
如果你熟悉java或者它的别的变种语言的话 ，你会发现NSOperation对象很像java.lang.Runnable接口，就像java.lang.Runnable接口那样，NSOperation类也被设计为可扩展的，而且只有一个需要重写的方法。它就是－(void)main。使用NSOperation的最简单的方式就是把一个NSOperation对象加入到NSOperationQueue队列中，一旦这个对象被加入到队列，队列就开始处理这个对象，直到这个对象的所有操作完成。然后它被队列释放。
下面的例子中，使用一个获取网页，并对其解析程NSXMLDocument，最后将解析得到的NSXMLDocument返回给主线程。
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==========================================================================
PageLoadOperation.h@interface PageLoadOperation : NSOperation {
NSURL *targetURL;}
@property(retain) NSURL *targetURL;
- (id)initWithURL:(NSURL*)url;@end
PageLoadOperation.m
#import "PageLoadOperation.h"#import "AppDelegate.h"@implementation PageLoadOperation@synthesize targetURL;- (id)initWithURL:(NSURL*)url;{
if (![super init]) return nil;
[self setTargetURL:url];
return self;}- (void)dealloc {
[targetURL release], targetURL = nil;
[super dealloc];
}
- (void)main
{
NSString *webpageString = ［[NSString alloc]
initWithContentsOfURL:[self targetURL］ autorelease];
NSError *error = nil;
NSXMLDocument *document = ［NSXMLDocument alloc]
initWithXMLString:webpageString
options:NSXMLDocumentTidyHTML error:&error];
if (!document) {
NSLog(@"%s Error loading document (%@): %@",
_cmd, ［self targetURL] absoluteString], error);
return;
}
［AppDelegate shared]
performSelectorOnMainThread:@selector(pageLoaded:)
withObject:document waitUntilDone:YES];
[document release];
}
@end
==========================================================================
==========================================================================
正如我们所看到的那样，这个类相当的简单，在它的init方法中接受一个url并保存起来，当main函数被调用的时候，它使用这个保存的url创建一个字符串，并将这个字符串传递给NSXMLDocumentinit方法。如果加载的xml数据没有出错，数据会被传递给AppDelegate，它处于主线程中。到此，这个线程的任务就完成了。在主线程中注销操作队列的时候，会将这个NSOperation对象释放。
AppDelegate.h
@interface AppDelegate : NSObject {
NSOperationQueue *queue;
}+ (id)shared;- (void)pageLoaded:(NSXMLDocument*)document;@endAppDelegate.m #import "AppDelegate.h"#import "PageLoadOperation.h"@implementation AppDelegate
static AppDelegate *shared;
static NSArray *urlArray;
- (id)init
{
if (shared)
{
[self autorelease];
return shared;
}
if (![super init]) return nil; NSMutableArray *array = ［NSMutableArray alloc] init];[array addObject:@"http://www.google.com"];[array addObject:@"http://www.apple.com"];[array addObject:@"http://www.yahoo.com"];[array addObject:@"http://www.zarrastudios.com"];[array addObject:@"http://www.macosxhints.com"];urlArray = array; queue = ［NSOperationQueue alloc] init];shared = self;return self;
}
• (void)applicationDidFinishLaunching:
(NSNotification *)aNotification
{
for (NSString *urlString in urlArray)
{
NSURL *url =
[NSURL URLWithString:urlString]; PageLoadOperation *plo =
［PageLoadOperation alloc] initWithURL:url];
[queue addOperation:plo];
[plo release];
}
}
- (void)dealloc
{
[queue release], queue = nil;
[super dealloc];
}
+ (id)shared;
{
if (!shared) {
［AppDelegate alloc] init];
}
return shared;
}
- (void)pageLoaded:(NSXMLDocument*)document;
{
NSLog(@"%s Do something with the XMLDocument: %@",
_cmd, document);
}
@end
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==========================================================================
NSOperationQueue的并行控制（NSOperationQueue Concurrency）
在上面这个简单的例子中，我们很难看出这些操作是并行运行的，然而，如果你你的操作花费的时间远远比这里的要长，你将会发现，队列是同时执行这些操作的。幸运的是，如果你想要为队列限制同时只能运行几个操作，你可以使用NSOperationQueue的setMaxConcurrentOperationCount:方法。
例如，[queue setMaxConcurrentOperationCount:2];
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工程起始：
1. 添加源文件和framework
开发Web等网络应用程序的时候，需要确认网络环境，连接情况等信息。如果没有处理它们，是不会通过Apple的审(我们的)查的。
Apple 的 例程 Reachability 中介绍了取得/检测网络状态的方法。要在应用程序程序中使用Reachability，首先要完成如下两部：
1.1. 添加源文件：
在你的程序中使用 Reachability 只须将该例程中的 Reachability.h 和 Reachability.m 拷贝到你的工程中。如下图：
1.2.添加framework：
将SystemConfiguration.framework 添加进工程。如下图：
2. 网络状态
==========================================================================
Reachability.h中定义了三种网络状态：
typedef enum {
NotReachable = 0, //无连接
ReachableViaWiFi, //使用3G/GPRS网络
ReachableViaWWAN //使用WiFi网络
} NetworkStatus;
==========================================================================
因此可以这样检查网络状态：
==========================================================================
Reachability *r = [Reachability reachabilityWithHostName:@“www.apple.com”];
switch ([r currentReachabilityStatus]) {
case NotReachable:
// 没有网络连接
break;
case ReachableViaWWAN:
// 使用3G网络
break;
case ReachableViaWiFi:
// 使用WiFi网络
break;
}
==========================================================================
3.检查当前网络环境
程序启动时，如果想检测可用的网络环境，可以像这样
==========================================================================
// 是否wifi
+ (BOOL) IsEnableWIFI {
return (［Reachability reachabilityForLocalWiFi] currentReachabilityStatus] != NotReachable);
}
// 是否3G
+ (BOOL) IsEnable3G {
return (［Reachability reachabilityForInternetConnection] currentReachabilityStatus] != NotReachable);
}
例子：
- (void)viewWillAppear:(BOOL)animated {
if (([Reachability reachabilityForInternetConnection].currentReachabilityStatus == NotReachable) &&
([Reachability reachabilityForLocalWiFi].currentReachabilityStatus == NotReachable)) {
self.navigationItem.hidesBackButton = YES;
[self.navigationItem setLeftBarButtonItem:nil animated:NO];
}
}
==========================================================================
4. 链接状态的实时通知
网络连接状态的实时检查，通知在网络应用中也是十分必要的。接续状态发生变化时，需要及时地通知用户：
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Reachability 1.5版本
// My.AppDelegate.h
#import "Reachability.h"
@interface MyAppDelegate : NSObject <UIApplicationDelegate> {
NetworkStatus remoteHostStatus;
}
@property NetworkStatus remoteHostStatus;
@end
// My.AppDelegate.m
#import "MyAppDelegate.h"
@implementation MyAppDelegate
@synthesize remoteHostStatus;
// 更新网络状态
- (void)updateStatus {
self.remoteHostStatus = ［Reachability sharedReachability] remoteHostStatus];
}
// 通知网络状态
- (void)reachabilityChanged:(NSNotification *)note {
[self updateStatus];
if (self.remoteHostStatus == NotReachable) {
UIAlertView *alert = ［UIAlertView alloc] initWithTitle:NSLocalizedString(@"AppName", nil)
message:NSLocalizedString (@"NotReachable", nil)
delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
[alert show];
[alert release];
}
}
// 程序启动器，启动网络监视
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// 设置网络检测的站点
［Reachability sharedReachability] setHostName:@"www.apple.com"];
［Reachability sharedReachability] setNetworkStatusNotificationsEnabled:YES];
// 设置网络状态变化时的通知函数
［NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:)
name:@"kNetworkReachabilityChangedNotification" object:nil];
[self updateStatus];
}
- (void)dealloc {
// 删除通知对象
［NSNotificationCenter defaultCenter] removeObserver:self];
[window release];
[super dealloc];
}
Reachability 2.0版本
// MyAppDelegate.h
@class Reachability;
@interface MyAppDelegate : NSObject <UIApplicationDelegate> {
Reachability *hostReach;
}
@end
// MyAppDelegate.m
- (void)reachabilityChanged:(NSNotification *)note {
Reachability* curReach = [note object];
NSParameterAssert([curReach isKindOfClass: [Reachability class］);
NetworkStatus status = [curReach currentReachabilityStatus];
if (status == NotReachable) {
UIAlertView *alert = ［UIAlertView alloc] initWithTitle:@"AppName""
message:@"NotReachable"
delegate:nil
cancelButtonTitle:@"YES" otherButtonTitles:nil];
[alert show];
[alert release];
}
}
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// ...
// 监测网络情况
［NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reachabilityChanged:)
name: kReachabilityChangedNotification
object: nil];
hostReach = ［Reachability reachabilityWithHostName:@"www.google.com"] retain];
hostReach startNotifer];
// ...
}
==========================================================================
==========================================================================
二：使用NSConnection下载数据
1.创建NSConnection对象，设置委托对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[self urlString］];
[NSURLConnection connectionWithRequest:request delegate:self];
2. NSURLConnection delegate委托方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error;
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;
- (void)connectionDidFinishLoading:(NSURLConnection *)connection;
3. 实现委托方法
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
// store data
[self.receivedData setLength:0]; //通常在这里先清空接受数据的缓存
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
/* appends the new data to the received data */
[self.receivedData appendData:data]; //可能多次收到数据，把新的数据添加在现有数据最后
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
// 错误处理
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
// disconnect
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
NSString *returnString = ［NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding];
NSLog(returnString);
[self urlLoaded:[self urlString] data:self.receivedData];
firstTimeDownloaded = YES;
}
三：使用NSXMLParser解析xml文件
1. 设置委托对象，开始解析
NSXMLParser *parser = ［NSXMLParser alloc] initWithData:data]; //或者也可以使用initWithContentsOfURL直接下载文件，但是有一个原因不这么做：
// It's also possible to have NSXMLParser download the data, by passing it a URL, but this is not desirable
// because it gives less control over the network, particularly in responding to connection errors.
[parser setDelegate:self];
[parser parse];
2. 常用的委托方法
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName
attributes:(NSDictionary *)attributeDict;
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName;
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string;
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError;
static NSString *feedURLString = @"http://www.newegg.com.cn/Product/A26-115-1HW.htm";
3. 应用举例
- (void)parseXMLFileAtURL:(NSURL *)URL parseError:(NSError **)error
{
NSXMLParser *parser = ［NSXMLParser alloc] initWithContentsOfURL:URL];
[parser setDelegate:self];
[parser setShouldProcessNamespaces:NO];
[parser setShouldReportNamespacePrefixes:NO];
[parser setShouldResolveExternalEntities:NO];
[parser parse];
NSError *parseError = [parser parserError];
if (parseError && error) {
*error = parseError;
}
[parser release];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString*)qName attributes:(NSDictionary *)attributeDict{
// 元素开始句柄
if (qName) {
elementName = qName;
}
if ([elementName isEqualToString:@"user"]) {
// 输出属性值
NSLog(@"Name is %@ , Age is %@", [attributeDict objectForKey:@"name"], [attributeDict objectForKey:@"age"]);
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName
{
// 元素终了句柄
if (qName) {
elementName = qName;
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
// 取得元素的text
}
NSError *parseError = nil;
[self parseXMLFileAtURL:[NSURL URLWithString:feedURLString] parseError:&parseError];
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APP OBJ 实例
/* Function For 百度 mp3 搜索模块 */
/*
请求百度mp3搜索页面获得歌曲信息数组
by BinJian.Wong on Sleeplez.com
update on 2010.2.1
mykeyWords = 关键字
pageNavi = 歌曲条目从pageNavi起
*/
+(NSArray*) KeyWordsForSongs:(NSString*)myKeyWords pageNavi:(int)myPageNavi;
/*
解密百度mp3链接加密算法
by BinJian.Wong on Sleeplez.com
update on 2010.2.1
myEncodeURL = 经过加密的链接
*/
+(NSString*) decodeBaiduURL:(NSString *)myEncodeURL;
/*
从百度下载页面中获得经过加密的下载链接
by BinJian.Wong on Sleeplez.com
update on 2010.2.1
myDownpage = 下载页面的链接地址
*/
+(NSString*) DownPageURLToMusicFileURL:(NSString *)myDownpage;
// .m
[/pre]+(NSArray*) KeyWordsForSongs:(NSString*)myKeyWords pageNavi:(int)myPageNavi{
int pageNavi = myPageNavi; //页码
NSString * keyWords = myKeyWords; //关键字
//NSString * keyWords = @"林肯公园";
//创建字符串
NSString * myURL = [NSString stringWithFormat:@"http://mp3.baidu.com/m?f=ms&rf=idx&tn=baidump3&ct=134217728&lf=&rn=&word=%@&lm=0&pn=%d",keyWords,pageNavi];
//UTF8 to gb2312
myURL = [myURL stringByAddingPercentEscapesUsingEncoding:CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)];
NSLog(@"%@",myURL);
ASIHTTPRequest *myRequest = ［[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:myURL］ autorelease];
[myRequest startSynchronous];
//如果发生错误，返回nil
if ([myRequest error]) return nil;
//返回数组定义
NSMutableArray * mySongs = [NSMutableArray arrayWithCapacity:15];
//编码转换 gb2313 to UTF
NSData * myResponseData = [myRequest responseData];
NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000);
NSString * myResponseStr = ［NSString alloc] initWithData:myResponseData encoding:enc];
//NSLog(@"html=%@",myResponseStr);
//如果百度没有返回结果
NSRange myRange;
myRange = [myResponseStr rangeOfString:@"抱歉，没有找到与"];
if (myRange.location != NSNotFound) {
return nil;
};
//将源代码按 ” <td class="d"><a href= “ 切割
NSMutableArray * myResponseArrForSinger = (NSMutableArray *)[myResponseStr componentsSeparatedByString:@"<td class="d"><a href="];
//去头去尾
if ([myResponseArrForSinger count]>=2) {
[myResponseArrForSinger removeObjectAtIndex:0];
[myResponseArrForSinger removeObjectAtIndex:[myResponseArrForSinger count]-1];
}
//按段处理
for (int i=0; i<[myResponseArrForSinger count]; i++) {
//
@try {
//把段按 “ .html" target="_blank"> ” 切割
NSMutableArray * mySubArr = (NSMutableArray *)［myResponseArrForSinger objectAtIndex:i] componentsSeparatedByString:@".html\" target=\"_blank\">"];
//处理歌曲下载页面的URL
NSArray * myURLTmpArr = ［mySubArr objectAtIndex:0] componentsSeparatedByString:@"\" title=\"请点击左键！来源网址： "];
myURLTmpArr = ［mySubArr objectAtIndex:0] componentsSeparatedByString:@"\""];
NSMutableString * SongsURL = [myURLTmpArr objectAtIndex:1];
//[SongsURL stringByAddingPercentEscapesUsingEncoding:enc];
//NSLog(@"url= %@",SongsURL);
for (int j=0; j<[mySubArr count]; j++) {
NSLog(@"%d= %@",j,[mySubArr objectAtIndex:j]);
}
//如果只有一段，表示 无 歌手名 和 专辑名
//if ([mySubArr count]<=1) {
//NSLog()
//常量定义 段的意义
const int Const_Songs = 0;
const int Const_Singer = 1;
const int Const_Album = 4;
//变量定义
NSMutableString * SongsName = (NSMutableString*)@"";
NSString * SongsSinger = @"";
NSString * SongsAlbum = @"";
NSString * SongsSpeed = @"";
NSString * SongsSize = @"";
//处理 歌曲大小
NSMutableArray * mySizeArr = (NSMutableArray*)［mySubArr objectAtIndex:([mySubArr count]-1)] componentsSeparatedByString:@"<td>"];
if ([mySizeArr count]>=2) {
SongsSize = [mySizeArr objectAtIndex:([mySizeArr count]-2)];
NSLog(@"size = %@",SongsSize);
};
//处理 歌曲链接速度图片
@try {
if ([mySubArr count]>=3) {
if ([mySubArr objectAtIndex:([mySubArr count]-1)]!=nil) {
NSMutableArray * mySpeedArr = (NSMutableArray*)［mySubArr objectAtIndex:([mySubArr count]-1)] componentsSeparatedByString:@"<td class="spd"><img src=\"http://img.baidu.com/img/mp3/"];
if ([mySpeedArr count]>0)
if ([mySpeedArr objectAtIndex:1]!=nil)
mySpeedArr = (NSMutableArray*)［mySpeedArr objectAtIndex:1] componentsSeparatedByString:@"\"></td>"];
if ([mySpeedArr objectAtIndex:0]!=nil)
SongsSpeed = [mySpeedArr objectAtIndex:0];
NSLog(@"test speed = %@",SongsSpeed);
}
};
}
@catch (NSException * e) {
//none
}
@finally {
//none
}
//处理 歌曲名
NSMutableArray * myTmpArr = (NSMutableArray *)［mySubArr objectAtIndex:Const_Songs] componentsSeparatedByString:@"\"return ow(event,this)\" target=\"_blank\">"];
myTmpArr = (NSMutableArray *)［myTmpArr objectAtIndex:1] componentsSeparatedByString:@"</a></td>"];
SongsName = [myTmpArr objectAtIndex:0];
NSString * mySubStr;
//处理 歌手名
if ([mySubArr count]>1) {
mySubStr = [mySubArr objectAtIndex:Const_Singer];
SongsSinger = mySubStr;
};
//处理 专辑名
if ([mySubArr count]>=5) {
mySubStr = [mySubArr objectAtIndex:Const_Album];
NSMutableArray * mySubSubArr = (NSMutableArray *)[mySubStr componentsSeparatedByString:@"</a>"];
mySubStr = [mySubSubArr objectAtIndex:0];
SongsAlbum = mySubStr;
} else {
SongsAlbum = @"";
};
//处理: 歌曲名中如果包含歌词
NSMutableString *tmp = [NSMutableString stringWithString:SongsName];
NSRange range = [tmp rangeOfString:@"<br><font color=\"#999999\" class="f10">"];
if (range.location != NSNotFound) {
range.length = SongsName.length - range.location;
//NSLog(@"%d !",range.length);
[tmp deleteCharactersInRange:range];
//NSLog(@"test =%@",tmp);
SongsName = tmp;
}
//[tmp release];
//NSLog(@"t= %@, %@ , %@",SongsName,SongsSinger,SongsAlbum);
NSString * FinalStr = ［[NSString alloc] initWithFormat:@"<头>%@<分割>%@<分割>%@<分割>%@<分割>%@<分割>%@",
SongsName,SongsSinger,SongsAlbum,SongsURL,SongsSpeed,SongsSize] autorelease];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"<font color=\"#c60a00\">" withString:@""];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"</font>" withString:@""];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"</a>" withString:@""];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"<a href=\"http://mp3.baidu.com/singerlist/" withString:@""];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@" " withString:@""];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"'" withString:@"'"];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"<头> " withString:@"<头>"];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"<头>" withString:@""];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"&" withString:@"&"];
FinalStr = [FinalStr stringByReplacingOccurrencesOfString:@"</td>" withString:@""];
FinalStr = [FinalStr stringByReplacingPercentEscapesUsingEncoding:enc];
//if ([SongsURL hasSuffix:@"3"]) {
[mySongs addObject:FinalStr];
//};
//]
}
@catch (NSException * e) {
//
}
@finally {
// none
}
};
[myResponseStr release];
return (NSArray *)mySongs;
}
+(NSString*)decodeBaiduURL:(NSString*)myEncodeURL{
//
NSString * returnURL = ［[NSString alloc] initWithFormat:@""] autorelease];
//char *myCEncodeURL = [myEncodeURL cStringcStringWithEncoding:NSASCIIStringEncoding];
NSLog(@"input %@",myEncodeURL);
//字串
static NSString * myConst = @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
int pyl ; // 偏移量
//NSRange myRange = [myEncodeURL rangeOfString:@":"]; //定位 协议标识符
UniChar myUniChr = [myEncodeURL characterAtIndex:0]; //取出第一字符
//转换类型
NSString * myChrAsStr = ［[NSString alloc] initWithFormat:@"%C",myUniChr] autorelease];
//确定第一字符在字串中的位置
NSRange myRange2 = [myConst rangeOfString:myChrAsStr];
int myFirstChrLocation = myRange2.location;
//计算偏移量
pyl = myFirstChrLocation - 33 ;
// 33 means "h" 's location .
NSLog(@"len = %d",myEncodeURL.length);
//还原字串
//NSLog(@"pyl = %d",pyl);
for (int i=0; i<[myEncodeURL length]; i++) {
UniChar myTmpChr= [myEncodeURL characterAtIndex:i];
NSString * myTmpChrAsStr = ［[NSString alloc] initWithFormat:@"%C",myTmpChr] autorelease];
NSRange myTmpRange = [myConst rangeOfString: myTmpChrAsStr];
if (myTmpRange.location != NSNotFound) {
int newChrAsInt = myTmpRange.location - pyl;
//NSLog(@"pyl = %d , oldchr = %C , oldcount = %d, newcount = %d",pyl,myTmpChr,
//hai myTmpRange.location,newChrAsInt);
if (newChrAsInt<0) {
newChrAsInt = newChrAsInt + 62;
//NSLog(@"%d",newChrAsInt);
} else {
if (newChrAsInt>62) {
newChrAsInt = newChrAsInt % 62;
};
}
/// NSLog(@"! pyl = %d , oldchr = %C , oldcount = %d, newcount = %d",pyl,myTmpChr,
// myTmpRange.location,newChrAsInt);
myTmpChr = [myConst characterAtIndex:newChrAsInt];
};
//NSLog(@"%C",myTmpChr);
returnURL= [returnURL stringByAppendingFormat:@"%C",myTmpChr];
}
returnURL= [returnURL stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(@"output %@",returnURL);
return returnURL;
}
+(NSString*)DownPageURLToMusicFileURL:(NSString*)myDownpage{
NSURL * myURL = [NSURL URLWithString:myDownpage];
ASIHTTPRequest * myRequest = ［[ASIHTTPRequest alloc] initWithURL:myURL] autorelease];
[myRequest startSynchronous];
NSData * myResponseData = [myRequest responseData];
NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding (kCFStringEncodingGB_18030_2000);
NSString * myResponseStr = ［NSString alloc] initWithData:myResponseData encoding:enc];
//NSLog(@"resstr= %@", myResponseStr);
NSArray *myArr = [myResponseStr componentsSeparatedByString:@"var encurl = \""];
myArr = ［myArr objectAtIndex:1] componentsSeparatedByString:@"\", newurl = \"\";"];
[myResponseStr release];
return [self decodeBaiduURL:[myArr objectAtIndex:0］;
//
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