repeatedly call AddImageUrl(url) to assemble pdf document

Question

I'm using abcpdf and I'm curious if we can we recursively call AddImageUrl() function to assemble pdf document that compile multiple urls?

something like:

     int pageCount = 0;
     int theId = theDoc.AddImageUrl("http://stackoverflow.com/search?q=abcpdf+footer+page+x+out+of+", true, 0, true);
     //assemble document
     while (theDoc.Chainable(theId))
     {
        theDoc.Page = theDoc.AddPage();
        theId = theDoc.AddImageToChain(theId);
     }
     pageCount = theDoc.PageCount;
     Console.WriteLine("1 document page count:" + pageCount);
     //Flatten document
     for (int i = 1; i <= pageCount; i++)
     {
        theDoc.PageNumber = i;
        theDoc.Flatten();
     }

     //now try again
     theId = theDoc.AddImageUrl("http://stackoverflow.com/questions/1980890/pdf-report-generation", true, 0, true);
     //assemble document
     while (theDoc.Chainable(theId))
     {
        theDoc.Page = theDoc.AddPage();
        theId = theDoc.AddImageToChain(theId);
     }
     Console.WriteLine("2 document page count:" + theDoc.PageCount);
     //Flatten document
     for (int i = pageCount + 1; i <= theDoc.PageCount; i++)
     {
        theDoc.PageNumber = i;
        theDoc.Flatten();
     }
     pageCount = theDoc.PageCount;

edit: code that seems to work based on 'hunter' solution:

      static void Main(string[] args)
  {
     Test2();
  }

  static void Test2()
  {

     Doc theDoc = new Doc();
     // Set minimum number of items a page of HTML should contain. 
     theDoc.HtmlOptions.ContentCount = 10;// Otherwise the page will be assumed to be invalid.
     theDoc.HtmlOptions.RetryCount = 10; // Try to obtain html page 10 times
     theDoc.HtmlOptions.Timeout = 180000;// The page must be obtained in less then 10 seconds

     theDoc.Rect.Inset(0, 10);  // set up document
     theDoc.Rect.Position(5, 15);
     theDoc.Rect.Width = 602;
     theDoc.Rect.Height = 767;
     theDoc.HtmlOptions.PageCacheEnabled = false;

     IList<string> urls = new List<string>();
     urls.Add("http://stackoverflow.com/search?q=abcpdf+footer+page+x+out+of+");
     urls.Add("http://stackoverflow.com/questions/1980890/pdf-report-generation");
     urls.Add("http://yahoo.com");
     urls.Add("http://stackoverflow.com/questions/4338364/recursively-call-addimageurlurl-to-assemble-pdf-document");

     foreach (string url in urls)
        AddImage(ref theDoc, url);

     //Flatten document
     for (int i = 1; i <= theDoc.PageCount; i++)
     {
        theDoc.PageNumber = i;
        theDoc.Flatten();
     }

     theDoc.Save("batchReport.pdf");
     theDoc.Clear();
     Console.Read();

  }


  static void AddImage(ref Doc theDoc, string url)
  {
     int theId = theDoc.AddImageUrl(url, true, 0, true);
     while (theDoc.Chainable(theId))
     {
        theDoc.Page = theDoc.AddPage();
        theId = theDoc.AddImageToChain(theId); // is this right?
     }
     Console.WriteLine(string.Format("document page count: {0}", theDoc.PageCount.ToString()));
  }

edit 2:unfortunately calling AddImageUrl multiple times when generating pdf documents doesn't seem to work...

That's not recursion. Recursion is a function that calls itself. — Mark Storer, Dec 02 '10 at 18:24

score 7 · Accepted Answer · answered Dec 02 '10 at 21:08

Finally found reliable solution. Instead of executing AddImageUrl() function on the same underlying document, we should execute AddImageUrl() function on it's own Doc document and build collection of documents that at the end we will assemble into one document using Append() method. Here is the code:

      static void Main(string[] args)
  {
     Test2();
  }

  static void Test2()
  {
     Doc theDoc = new Doc();
     var urls = new Dictionary<int, string>();
     urls.Add(1, "http://www.asp101.com/samples/server_execute_aspx.asp");
     urls.Add(2, "http://stackoverflow.com/questions/4338364/repeatedly-call-addimageurlurl-to-assemble-pdf-document");
     urls.Add(3, "http://www.google.ca/");
     urls.Add(4, "http://ca.yahoo.com/?p=us");
    var theDocs = new List<Doc>();

     foreach (int key in urls.Keys)
        theDocs.Add(GetReport(urls[key]));

     foreach (var doc in theDocs)
     {
        if (theDocs.IndexOf(doc) == 0)
           theDoc = doc;
        else
           theDoc.Append(doc);
     }

     theDoc.Save("batchReport.pdf");
     theDoc.Clear();
     Console.Read();

  }


  static Doc GetReport(string url)
  {

     Doc theDoc = new Doc();
     // Set minimum number of items a page of HTML should contain. 
     theDoc.HtmlOptions.ContentCount = 10;// Otherwise the page will be assumed to be invalid.
     theDoc.HtmlOptions.RetryCount = 10; // Try to obtain html page 10 times
     theDoc.HtmlOptions.Timeout = 180000;// The page must be obtained in less then 10 seconds

     theDoc.Rect.Inset(0, 10);  // set up document
     theDoc.Rect.Position(5, 15);
     theDoc.Rect.Width = 602;
     theDoc.Rect.Height = 767;
     theDoc.HtmlOptions.PageCacheEnabled = false;

     int theId = theDoc.AddImageUrl(url, true, 0, true);
     while (theDoc.Chainable(theId))
     {
        theDoc.Page = theDoc.AddPage();
        theId = theDoc.AddImageToChain(theId);
     }

     //Flatten document
     for (int i = 1; i <= theDoc.PageCount; i++)
     {
        theDoc.PageNumber = i;
        theDoc.Flatten();
     }

     return theDoc;
  }

  }

this works for me as well, one thing to note if that you will have to reapply any page setup you have done if you use a new master document for all of the other ones, you can also get page numbers working as expected if you do the page number code after the appends — Daniel Powell, Jul 30 '13 at 00:50

repeatedly call AddImageUrl(url) to assemble pdf document

1 Answers1