DASetTextExtractionArea with different origin

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   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.