Debenu Quick PDF Library - PDF SDK Community Forum : DASetTextExtractionArea with different origin http://www.quickpdf.org/forum/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Sun, 12 Apr 2026 04:36:16 +0000 Wed, 19 Mar 2014 11:03:48 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 11.01 360 www.quickpdf.org/forum/RSS_post_feed.asp?TID=2850 <![CDATA[Debenu Quick PDF Library - PDF SDK Community Forum]]> http://www.quickpdf.org/forum/forum_images/QPDF_Forum_Title.png http://www.quickpdf.org/forum/ <![CDATA[DASetTextExtractionArea with different origin : AndrewC wrote:You need to adjust...]]> http://www.quickpdf.org/forum/dasettextextractionarea-with-different-origin_topic2850_post11572.html#11572 Author: Cirunz
Subject: 2850
Posted: 19 Mar 14 at 11:03AM

Originally posted by AndrewC AndrewC wrote:

You need to adjust the Y position by calling 

YPos := QP.DAGetPageHeight(dahandle, dapageref) - YPos;

Andrew.

Thank you Andrew, this is really helpfull.
I have a mixed scenario, so I will use this function to adjust the coordinates, depending on the case.

Thanks again.
Fabio.
]]> Wed, 19 Mar 2014 11:03:48 +0000 http://www.quickpdf.org/forum/dasettextextractionarea-with-different-origin_topic2850_post11572.html#11572 <![CDATA[DASetTextExtractionArea with different origin : Cirunz, Yes. It is a complex...]]> http://www.quickpdf.org/forum/dasettextextractionarea-with-different-origin_topic2850_post11570.html#11570 Author: AndrewC
Subject: 2850
Posted: 19 Mar 14 at 10:58AM

Cirunz,
Yes.  It is a complex thing to explain.  The DA functions do not support the SetOrigin function as SetOrigin is not a DA supported functions.  You cannot normally mix DA and non DA functions as they use different functions to process the file. The exception to this rule are that most of the Extract* functions do use the DA code and and not the non DA functions.

You need to adjust the Y position by calling 

YPos := QP.DAGetPageHeight(dahandle, dapageref) - YPos;

Andrew.
]]> Wed, 19 Mar 2014 10:58:43 +0000 http://www.quickpdf.org/forum/dasettextextractionarea-with-different-origin_topic2850_post11570.html#11570 <![CDATA[DASetTextExtractionArea with different origin : Hi, I&#039;m trying to extract...]]> http://www.quickpdf.org/forum/dasettextextractionarea-with-different-origin_topic2850_post11568.html#11568 Author: Cirunz
Subject: 2850
Posted: 18 Mar 14 at 2:32PM

Hi, I'm trying to extract text in a specific area, on a large number of pdf files.
My first approach is to loop for every file, open the file, select the page and proceed to extract the text with GetPageText:
//Code to initialize dll reference DPDF
int i = 0;
int mode = 7;
List<string> foundlines = new List<string>();
for (; i < pdffiles.Length; i++)
{
	if (DPDF.LoadFromFile(pdffiles, "") != 0)
	{
		if (DPDF.SelectPage(1) != 0)//I'm always searching in the first page
		{
			DPDF.SetMeasurementUnits(1);//Millimeters
			DPDF.SetOrigin(1);//Left-Top margin

			//field contains extraction area data
			if (DPDF.SetTextExtractionArea(field.Left, field.Top, field.Width, field.Height) == 1)
			{
				foundlines.Add(DPDF.GetPageText(mode).ToString().Trim());
			}
			
			DPDF.RemoveDocument(DPDF.SelectedDocument());
		}
		else
		{
			errormessage = "SelectPage: " + pdffiles;
			break;
		}
	}
	else
	{
		errormessage = "LoadFromFile: " + pdffiles;
		break;
	}
}//Extraction cycle end here

if (string.IsNullOrEmpty(errormessage))
{
	if (foundlines != null && foundlines.Count > 0)
	{
		File.WriteAllLines(@"C:\resultlines.txt", foundlines.ToArray());
		result = true;
	}
}

It works fine, but it's not very fast, and it uses lot of memory.
Worried by this results, I choosed to give a try to the ExtractFilePageText, so to keep low CPU and memory occupation.
So I've changed the above cycle in this way:
int i = 0;
int mode = 7;
List<string> foundlines = new List<string>();
DPDF.SetMeasurementUnits(1);//Millimeters
DPDF.SetOrigin(1);//Left-Top margin
for (; i < pdffiles.Length; i++)
{
	//field contains extraction area data
	if (DPDF.DASetTextExtractionArea(field.Left, field.Top, field.Width, field.Height) == 1)
	{
		foundlines.Add(DPDF.ExtractFilePageText(pdffiles, "", 1, mode).ToString().Trim());
	}
}//Extraction cycle end here

if (foundlines != null && foundlines.Count > 0)
{
	File.WriteAllLines(@"C:\resultlines.txt", foundlines.ToArray());
	result = true;
}

This does not find anything.
There is a simple explanation for this: Documentation says DASetTextExtractionArea is relative to the bottom left corner of the page, and do no mention a way to make the SetOrigin (or the SetMeasurementUnits), affect this function.

There is not a way to do so? The ExtractFilePageText can be only used with the default origin?

Thank you.

]]> Tue, 18 Mar 2014 14:32:53 +0000 http://www.quickpdf.org/forum/dasettextextractionarea-with-different-origin_topic2850_post11568.html#11568