Comparing PDF documents

Hi,

I have the following problem to work on and need help:

1) Have two pdf documents almost identical but in one document suppose there are 10 customer records and in another there are 12 customer records.

2) The thing is that the first document has two missing customer records missing from it which are present in another document.

3) My requirement is to read the pdf documents by some c# program and find out which 2 records are missing from the 1^st document.

Is there a way to accomplish this by some logic in my c# code.

Regards,

Using the LEADTOOLS SDK the requirements listed above can be accomplished. Do note this is a paid for SDK and I work for this vender. With the LEADTOOLS SDK you could use the DocumentComparer.CompareDocument() which would allow you to compare a list of documents and returns an object that has all the differences between the documents including the location and text that was either inserted or removed.

https://www.leadtools.com/help/sdk/v21/dh/dc/documentcomparer-comparedocument.html#!

Here is a small code snippet of how this could be done.

var doc1 = DocumentFactory.LoadFromFile(pathToDocument1, new LoadDocumentOptions());
var doc2 = DocumentFactory.LoadFromFile(pathToDocument2, new LoadDocumentOptions());
var docList = new List()
{
doc1,
doc2
};
var comparer = new DocumentComparer();
var diffs = comparer.CompareDocument(docList);
Console.WriteLine($"Total number of differences: {diffs.Differences.Count}");
Console.WriteLine($"Total number of insertions: {diffs.GetInsertions().Count}");
Console.WriteLine($"Total number of deletions: {diffs.GetDeletions().Count}");
foreach (PageCharactersDifference diff in diffs.Differences)
{
Console.WriteLine($"Operations: {diff.Operation}");
Console.WriteLine($"Text: {diff.Text}");
foreach (PageCharacter pageChar in diff.Characters)
{
Console.WriteLine($" Character: {pageChar.Character}");
Console.WriteLine($" Character Index: {pageChar.CharacterIndex}");
Console.WriteLine($" Page Number: {pageChar.PageNumber}");
Console.WriteLine($" Wordmap Index: {pageChar.WordMapIndex}");
}
Console.WriteLine("--------");
}

3 Replies

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Kurt Ambrose5y ago
Using the LEADTOOLS SDK the requirements listed above can be accomplished. Do note this is a paid for SDK and I work for this vender. With the LEADTOOLS SDK you could use the DocumentComparer.CompareDocument() which would allow you to compare a list of documents and returns an object that has all the differences between the documents including the location and text that was either inserted or removed.
https://www.leadtools.com/help/sdk/v21/dh/dc/documentcomparer-comparedocument.html#!
Here is a small code snippet of how this could be done.
var doc1 = DocumentFactory.LoadFromFile(pathToDocument1, new LoadDocumentOptions());
var doc2 = DocumentFactory.LoadFromFile(pathToDocument2, new LoadDocumentOptions());

var docList = new List()
{
   doc1,
   doc2
};

var comparer = new DocumentComparer();
var diffs = comparer.CompareDocument(docList);
Console.WriteLine($"Total number of differences: {diffs.Differences.Count}");
Console.WriteLine($"Total number of insertions: {diffs.GetInsertions().Count}");
Console.WriteLine($"Total number of deletions: {diffs.GetDeletions().Count}");
foreach (PageCharactersDifference diff in diffs.Differences)
{
   Console.WriteLine($"Operations: {diff.Operation}");
   Console.WriteLine($"Text: {diff.Text}");
   foreach (PageCharacter pageChar in diff.Characters)
   {
      Console.WriteLine($"    Character: {pageChar.Character}");
      Console.WriteLine($"    Character Index: {pageChar.CharacterIndex}");
      Console.WriteLine($"    Page Number: {pageChar.PageNumber}");
      Console.WriteLine($"    Wordmap Index: {pageChar.WordMapIndex}");
   }
   Console.WriteLine("--------");
}
Krishnendu Banerjee16y ago
Thnx Mahash. Yes I would definitely try that out.
Mahesh Chand16y ago
Can you use any third party conrols? Check out DynamicPDF. They have APIs that you can use to compare PDF documents.