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antesima
PostPosted: Wed Jul 02, 2008 9:46 am 
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Joined: Wed Jul 02, 2008 9:33 am
Posts: 5
Hello,

thanks for this excellent library, I use it almost every day.

Now, I'm having problems retrieving raw text from an existing
PDF File.

I use the following code, and the string are then parsed to find some info.

Code:
PdfDocument pddDoc = PdfReader.Open(strPath_, PdfDocumentOpenMode.ReadOnly);

foreach (PdfPage ppgPage in pddDoc.Pages)
{
    strReturn += Page.Contents.CreateSingleContent().Stream.ToString();
}


All is ok with PDF files generated by MS Reporting Services,
but with some PDF files generated with MigraDoc, I retrieve no text,
just codes as these ones :

Code:
15 0 Td <005000440076005700550048> Tj
36.979 0 Td <003C005900480056> Tj
27.662 0 Td <002700480045004800570048005100460052005800550057> Tj


It looks like dictionnary keys, but how can I extract the text content from it ?

Regards,
Antesima
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antesima
 Post subject:
PostPosted: Wed Jul 16, 2008 2:48 pm 
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Joined: Wed Jul 02, 2008 9:33 am
Posts: 5
Does somebody have a clue ?

Do you need a sample code that generates the PDF ?
(as it is generated with PDFSharp with Times New Roman font).
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Thomas Hoevel
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PostPosted: Wed Jul 16, 2008 3:12 pm 
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 3096
Location: Cologne, Germany
Between the brackets you see Unicode characters in hex format.
You can convert them to Unicode strings using .NET (take 4 chars, convert to int, convert to char, add to string).

Since the high byte is always 00 (in the samples shown) these are odinary ANSI chars.

I may be wrong: maybe these are not Unicode chars, but indices into the font subset.

It should also be possible to create ANSI PDF files with MigraDoc (it's a parameter of PdfDocumentRenderer).
OTOH for compatibility of your application with unknown PDF files you should support Unicode, too.

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Thomas Hoevel
PDFsharp Team
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antesima
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PostPosted: Thu Jul 17, 2008 6:27 am 
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Joined: Wed Jul 02, 2008 9:33 am
Posts: 5
Ok thank you I will give it a try and give you the feedback.

Regards,
Antesima
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antesima
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PostPosted: Thu Jul 24, 2008 8:56 am 
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Joined: Wed Jul 02, 2008 9:33 am
Posts: 5
It doesn't seem to fit...

Here is the string I try to convert :

"00280057005800470048"

and the code I use :

Code:
private static string ConvertNumericUnicode(string strArgument_)
        {
            string strResult = null;
            string strCurrent = strArgument_;
            while (strCurrent.Length >= 4)
            {
                int iChar = Int32.Parse(strCurrent.Substring(0, 4), System.Globalization.NumberStyles.AllowHexSpecifier);
               
                char cTemp = (char)iChar;
                strResult += cTemp;
                strCurrent = strCurrent.Substring(4);
            }
            return strResult;
        }


A I missing something ?

Regards,
Antesima
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Thomas Hoevel
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PostPosted: Thu Jul 24, 2008 3:12 pm 
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Joined: Mon Oct 16, 2006 8:16 am
Posts: 3096
Location: Cologne, Germany
So it seems these are indices into the font subsets, not unicode character codes (would be too simple :cry: ); don't blame me, I warned you about it.

So you have to add another level of indirection by looking into the font table. That's not my area of expertise so I can't give you any clue.

The other solution: create ANSI PDF files ...

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Thomas Hoevel
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antesima
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PostPosted: Tue Jul 29, 2008 12:38 pm 
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Joined: Wed Jul 02, 2008 9:33 am
Posts: 5
Ok thank you, I will try to get the fonts and extract the text.

If I manage to have some code that work, I will publish it here.
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