Failed to download and open a PDF file with error failed to find PDF header in ios

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I am having an app in which I am opening a PDF file from a url.

I am successfully able to open it in a webView.

Now I want to download that PDF file and sa

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2条回答

不知归路

2020-12-18 16:02

If convert to string server response, that you got in NSData *pdfData, you will see next:

<!DOCTYPE html>
<html>
<head>
    <title>iOS Developer Library</title>
    <meta charset="utf-8">
    <script>
        var content_page = "navigation";
        var href = window.location.href;
        if (window.location.href.match('#')) {
            var newhref = href.replace('#', '');
            newhref = newhref.replace('%23', '#');
          window.location.href = newhref;
        }
        else {
            console.log(content_page);
            console.log(content_page.match("content_page"));
            if(content_page.match("content_page")) {
                window.location.href = './navigation';
            }
            else {
                window.location.href = "./" + content_page;
            }
        }
    </script>
</head>    
<body>
</body>
<script type="text/javascript" src="/library/webstats/pagetracker.js"></script>
<script type="text/javascript">
if(typeof PageTracker !== 'undefined') {
  if(window.addEventListener) {
    window.addEventListener("load", function(){PageTracker.logPageLoad()},false);
  } else if(window.attachEvent) {
    window.attachEvent("onload",function(){PageTracker.logPageLoad()});
  }
}
</script>
</html>

This only web page, which, as I can assume, will forward you to document with another URI: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIWebView_Class/UIWebView_Class.pdf. So you must use this url if you want to download .pdf file

Also, pay attention on @pawan's answer, and use his approach to avoid download files in main thread

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抹茶落季

2020-12-18 16:11

try this code for downloading & saving your pdf file

    UIActivityIndicatorView *indicator=[[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

   [indicator startAnimating];

    NSLog(@"Downloading Started");
    NSString *urlToDownload = @"http://gradcollege.okstate.edu/sites/default/files/PDF_linking.pdf";
    NSURL  *url = [NSURL URLWithString:urlToDownload];
    NSURLRequest *request=[[NSURLRequest alloc] initWithURL:url cachePolicy:NSURLCacheStorageAllowed timeoutInterval:120.0f];

    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

        [indicator stopAnimating];

        if (!connectionError) {

            if ( data )
            {
                NSArray   *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
                NSString  *documentsDirectory = [paths objectAtIndex:0];

                NSString  *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"myfile.pdf"];

                //saving is done on main thread
                dispatch_async(dispatch_get_main_queue(), ^{
                    [data
                     writeToFile:filePath atomically:YES];
                    NSLog(@"File Saved !");

                    NSURL *url = [NSURL fileURLWithPath:filePath];
                    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
                    [_rssWebView setUserInteractionEnabled:YES];
                    //[_rssWebView setDelegate:self];
                    [_rssWebView loadRequest:requestObj];
                });
            }
        }

    }];

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