ASIHTTPRequest-断点续传需要原网站支持！

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- (IBAction)resumeInterruptedDownload:(id)sender

{

  NSURL *url = [NSURL URLWithString:

    @"http://www.dreamingwish.com/wp-content/uploads/2011/10/asihttprequest-auth.png"];

  ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];

  NSString *downloadPath = @"/Users/ben/Desktop/asi.png";

  //当request完成时，整个文件会被移动到这里

  [request setDownloadDestinationPath:downloadPath];

  //这个文件已经被下载了一部分

  [requestsetTemporaryFileDownloadPath:@"/Users/ben/Desktop/asi.png.download"];

  [request setAllowResumeForFileDownloads:YES];

  [request startSynchronous];

  //整个文件将会在这里

  NSString *theContent = [NSString stringWithContentsOfFile:downloadPath];

}