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Find text by font size?
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Skylla View Drop Down
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Joined: 21 May 13
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Skylla Quote  Post ReplyReply Direct Link To This Post Topic: Find text by font size?
    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!
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Ingo View Drop Down
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Joined: 29 Oct 05
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Points: 3529 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Ingo Quote  Post ReplyReply Direct Link To This Post 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
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Skylla View Drop Down
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Joined: 21 May 13
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Skylla Quote  Post ReplyReply Direct Link To This Post Posted: 21 May 13 at 9:51PM
Thank you for your good starting points!
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AndrewC View Drop Down
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Points: 841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndrewC Quote  Post ReplyReply Direct Link To This Post 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.
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Skylla View Drop Down
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Joined: 21 May 13
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Skylla Quote  Post ReplyReply Direct Link To This Post 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);
                }
            }
        }
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AndrewC View Drop Down
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Joined: 08 Dec 10
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Points: 841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndrewC Quote  Post ReplyReply Direct Link To This Post 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.
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Skylla View Drop Down
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Joined: 21 May 13
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Skylla Quote  Post ReplyReply Direct Link To This Post 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.
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AndrewC View Drop Down
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Joined: 08 Dec 10
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Points: 841 		Post Options Post Options   Thanks (0) Thanks(0)   Quote AndrewC Quote  Post ReplyReply Direct Link To This Post 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.
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