CODEWITHSUNDEEP
iosobjective-cnsurl
Clip
Clip

Reputation: 3078

Get image URL from webpage

I am trying to get the image from this website, but I am having a hard time. All I need is the URL of the image, when I print the URL I get noting back. This is the URL and I am trying to get the main image seen in the middle, http://theoldrussuanbum.vsco.co/media/555722fde555153e3e8b4591

I have been trying the following code with no luck.

NSURL *URL = [NSURL URLWithString:_urlTextField.text];

NSURLSession *session = [NSURLSession sharedSession];
[[session dataTaskWithURL:URL completionHandler:
  ^(NSData *data, NSURLResponse *response, NSError *error) {
      NSString *contentType = nil;
      if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
          NSDictionary *headers = [(NSHTTPURLResponse *)response allHeaderFields];


          contentType = headers[@"Content-Type"];
      }
      HTMLDocument *document = [HTMLDocument documentWithData:data
                                        contentTypeHeader:contentType];

      HTMLElement *element = [document firstNodeMatchingSelector:@"img"];

      NSString *urlString = element.attributes[@"src"];

      NSLog(@"URL: %@", urlString);

  }] resume];

Can anyone help?

Upvotes: 0

Views: 720

Answers (2)

zaph
zaph

Reputation: 112875

You can use regular expressions to first
find the start with the regular expression: @"twitter:image\"\\s+content=\""
and then
extract the URL with the regular expression: @"[^>]+"

You can find information of regular expression syntax at the ICU User Guide: Regular Expressions.

Example code:

NSString *urlString = @"http://theoldrussuanbum.vsco.co/media/555722fde555153e3e8b4591";
NSURL *URL = [NSURL URLWithString:urlString];

NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *sessionTask;
sessionTask = [session dataTaskWithURL:URL completionHandler:
               ^(NSData *data, NSURLResponse *response, NSError *error) {

                   NSString *html = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
                   NSRange preambleRange = [html rangeOfString:@"twitter:image\"\\s+content=\"" options:NSRegularExpressionSearch];
                   if (preambleRange.location != NSNotFound) {
                       NSString *htmlOffset = [html substringFromIndex:preambleRange.location + preambleRange.length];
                       NSRange imgUrlRange = [htmlOffset rangeOfString:@"[^>]+" options:NSRegularExpressionSearch];
                       if (imgUrlRange.location != NSNotFound) {
                           NSString *imgURLString = [htmlOffset substringWithRange:imgUrlRange];
                           NSLog(@"URL: %@", imgURLString);
                       }
                   }

               }];
[sessionTask resume];

Output:

URL: http://image.vsco.co/1/548c6a64020e11517164/555722fde555153e3e8b4591/600x800/vsco_051615.jpg"

Of course production code must handle all errors which this example code does not.

Upvotes: 3

vichevstefan
vichevstefan

Reputation: 898

I think first thing you need to do is provide actual url of image resource.

For example; http://image.vsco.co/1/548c6a64020e11517164/548c7b532b5615b6658b4567/vsco_121314.jpg

This is what I get from page source of that web page

And then just refer this question;

iOS download and save image inside app

Upvotes: 0

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