I need help - I can help - Find text by font size?

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Find text by font size?

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=2648
Printed Date: 05 May 25 at 6:44AM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: Find text by font size?

Posted By: Skylla
Subject: Find text by font size?
Date Posted: 21 May 13 at 7:57PM

I am trying to find out how to extract text with "specific font size" from pdf file via C#? For example search pdf file, find 22pt text and extract it. Is there a way to accomplist this via quick pdf? Any ideas or sample codes? Need help from gurus! Thank you!

Replies:

Posted By: Ingo
Date Posted: 21 May 13 at 8:12PM

Hi Skylla!

That's easy stuff so you should succeed by your own ;-)
Take a starting code for beginners:
http://www.quickpdflibrary.com/help/getting-started-activex.php
Insert a LoadFromFile...
Insert a PageCount...
Then create a loop with PageCount
...and there insert the functionality of ExtractFilePageText with Option 3.
Here you can read all about option 3 and then you know how to do:
http://www.quickpdflibrary.com/help/quickpdf/ExtractFilePageText.php

Cheers and welcome here,
Ingo

Posted By: Skylla
Date Posted: 21 May 13 at 9:51PM

Thank you for your good starting points!

Posted By: AndrewC
Date Posted: 23 May 13 at 5:25AM

Skylla,

Here is some sample code that shows how easy it is to extract the text with the new text block functions.

QP.LoadFromFile("99pages.pdf", "");

for (int i = 1; i <= QP.PageCount();i++)

{

QP.SelectPage(i);

int id = QP.ExtractPageTextBlocks(3);

for (int w=1 ; w<=QP.GetTextBlockCount(id) ; w++)

{

double size = QP.GetTextBlockFontSize(id, w);

if (Math.Round(size) == 22)

MessageBox.Show("Page :" + i.ToString() + " Word:" + w.ToString() + "'" + QP.GetTextBlockText(id, w) + "'");

}

QP.ReleaseTextBlocks(id);

}

Andrew.

Posted By: Skylla
Date Posted: 23 May 13 at 8:38AM

Hi Andrew.

Thank you for your sample. Tried that code, in runtime i got the following results;

id = 1476395009,

Result of qp.GetTextBlockCount(id) = 0

so loop in for (int w = 1; w <= qp.GetTextBlockCount(id); w++) not succeed. Do you have an idea what is happening?

var qp = new PDFLibrary("C:\\DebenuPDFLibraryDLL0914.dll");

const string licenseKey = "licencekey";

var result = qp.UnlockKey(licenseKey);

if (qp.LibraryLoaded())

{

if (result == 1)

{

qp.LoadFromFile("aaa.pdf", "");

for (int i = 1; i <= qp.PageCount(); i++)

{

qp.SelectPage(i);

int id = qp.ExtractPageTextBlocks(3);

for (int w = 1; w <= qp.GetTextBlockCount(id); w++)

{

double size = qp.GetTextBlockFontSize(id, w);

if (Math.Round(size) == 22)

Response.Write("Page :" + i.ToString(CultureInfo.InvariantCulture) + " Word:" + w.ToString(CultureInfo.InvariantCulture) + "'" + qp.GetTextBlockText(id, w) + "'" + "<br>");

}

qp.ReleaseTextBlocks(id);

}

Posted By: AndrewC
Date Posted: 23 May 13 at 9:01AM

If it returned 0 then it is not finding any text on the page. I would need to see the PDF file before I could make and further comments.

Andrew.

Posted By: Skylla
Date Posted: 23 May 13 at 2:05PM

Its a basic pdf actually which is create by me for testing.

http://speedy.sh/KMPmW/aaa.pdf

Just 24, 23, 22, 20 pt text's in it. Created with word, saved as pdf.

Posted By: AndrewC
Date Posted: 24 May 13 at 8:25AM

My code is working correctly with your PDF and is returning the 22pt font from both pages.

Is LoadFromFile returning 1 in your case ? Does QP.PageCount return 1 or 2 ? It should be 2 for your PDF. It could be a permissions problem. I suspect LoadFromFile is failing. By default QPL always has a single blank page allocated in memory it could be that is the reason nothing is being extracted.

You may then try string s= QP.GetPageText(7); MessageBox.Show(s); to make sure the text is actually being extracted.

Andrew.