ASIHTTPRequest 1.x：断点续传

 

撰写于 2012 年 11 月 6 日 | 转载自 :  http://itjoy.org/?p=469

ASIHTTPRequest支持断点续传，断点续传的时候我们要设置一个临时容器来接收数据，当数据完全下载完毕的时候，文件将从临时文件夹移入到指定文件夹，自动删除临时文件夹中的内容。

 

代码实例：下载一首歌曲

////////////////

- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    

    //progress

    self.progressIndicator = [[[UIProgressView alloc]initWithFrame:CGRectMake(10, 80, 300, 10)]autorelease];

    [self.view addSubview:self.progressIndicator];

    

    ///startBtn

    UIButton *startBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    startBtn.frame = CGRectMake(20, 100, 100, 60);

    [startBtn setTitle:@"Start" forState:UIControlStateNormal];

    [startBtn addTarget:self action:@selector(downloadStart:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:startBtn];

    

    

    UIButton *pauseBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    pauseBtn.frame = CGRectMake(200, 100, 100, 60);

    [pauseBtn setTitle:@"Pause" forState:UIControlStateNormal];

    [pauseBtn addTarget:self action:@selector(downloadPause:) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:pauseBtn];

    

}



- (void)downloadStart:(UIButton *)btn

{

    ///创建请求

    self.request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:@"http://zhangmenshiting.baidu.com/data2/music/35417538/13880429190800192.mp3?xcode=ead0f4d3b15d47b6273650a58d1b4b7f"]];

    ///设置代理

    self.request.delegate = self;

    //进度显示

    self.request.downloadProgressDelegate = self.progressIndicator;

    ///另一种获取进度的方法，需要遵守ASIProgressDelegate协议

    //self.request.downloadProgressDelegate = self;

    ///精确显示进度信息

    self.request.showAccurateProgress = YES;

    //文件存储目录

    NSString *savePath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"safe&sound.mp3"];

    NSLog(@"savePath=%@",savePath);

    ///文件临时目录

    NSString *temp = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"temp"];

    //

    NSString *tempPath = [temp stringByAppendingPathComponent:@"temp.mp3"];

    NSLog(@"tempPaht=%@",tempPath);

    

    //如果临时目录不存在则创建

    NSFileManager *fileManager = [NSFileManager defaultManager];

    BOOL fileExists = [fileManager fileExistsAtPath:tempPath];

    if (!fileExists) {

        [fileManager createDirectoryAtPath:temp withIntermediateDirectories:YES attributes:nil error:nil];

    }

    //设置存储目录

    self.request.downloadDestinationPath = savePath;

    //设置临时目录

    self.request.temporaryFileDownloadPath = tempPath;

    //允许断点续传

    self.request.allowResumeForFileDownloads = YES;

    //下载完毕执行

    self.request.didFinishSelector = @selector(FetchDataFinished:);

    //下载失败执行

    self.request.didFailSelector = @selector(FetchDataFailed:);

    //下载信息上下文

    self.request.userInfo = [NSDictionary dictionaryWithObjectsAndKeys:@"safe&sound",@"music", nil];

    //开始异步下载

    [self.request startAsynchronous];

    

    

}



#pragma mark -- pause method

- (void)downloadPause:(UIButton *)btn

{

    [self.request clearDelegatesAndCancel];

}



#pragma mark -- request delegate

- (void)requestStarted:(ASIHTTPRequest *)request

{

    NSLog(@"request start");

}

- (void)request:(ASIHTTPRequest *)request didReceiveResponseHeaders:(NSDictionary *)responseHeaders

{

    NSLog(@"receive responseHeader");

}



//- (void)request:(ASIHTTPRequest *)request didReceiveBytes:(long long)bytes

//{

    //如果自己实现那个进度条，就遵守ASIProgressDelegate 实现此方法即可，获取大小，更新进度条

//    NSLog(@"total=%lld",request.totalBytesRead);

//    NSLog(@"length=%lld",request.contentLength);

//}



#pragma mark -- finish & fail

- (void)FetchDataFinished:(ASIHTTPRequest *)request

{

    NSLog(@"finished");

    NSLog(@"reqest.userinfo=%@",[request.userInfo objectForKey:@"music"]);

}



- (void)FetchDataFailed:(ASIHTTPRequest *)request

{

    NSLog(@"failed");

    NSLog(@"error=%@",[request.error localizedDescription]);

}